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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Jan. 28, 2012	Mar. 16, 2012	Jul. 29, 2011
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jan. 28, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	MRVL
Entity Registrant Name	MARVELL TECHNOLOGY GROUP LTD
Entity Central Index Key	0001058057
Current Fiscal Year End Date	--01-28
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		580,600,000
Entity Public Float			$ 5,617,000,000

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Current assets:
Cash and cash equivalents	$ 784,902	$ 1,847,074
Short-term investments	1,461,596	1,082,956
Accounts receivable, net of allowances of $2,663 and $7,366	407,263	459,406
Inventories	354,119	245,448
Prepaid expenses and other current assets	60,412	66,945
Deferred income taxes	10,669	10,818
Total current assets	3,078,961	3,712,647
Property and equipment, net	383,801	358,440
Long-term investments	23,215	26,226
Goodwill	2,031,991	2,004,833
Acquired intangible assets, net	141,505	124,631
Other non-current assets	108,146	111,380
Total assets	5,767,619	6,338,157
Current liabilities:
Accounts payable	304,695	332,007
Accrued liabilities	87,655	85,994
Accrued employee compensation	137,245	146,524
Deferred income	59,959	76,161
Total current liabilities	589,554	640,686
Non-current income taxes payable	131,579	136,262
Other long-term liabilities	32,468	39,340
Total liabilities	753,601	816,288
Commitments and contingencies (Note 12)
Shareholders' equity:
Preferred stock, $0.002 par value; 8,000 shares authorized; no shares issued and outstanding
Common stock, $0.002 par value; 992,000 shares authorized; 583,671 and 659,372 shares issued and outstanding, respectively	1,162	1,317
Additional paid-in capital	3,683,117	4,805,588
Accumulated other comprehensive income	776	1,092
Retained earnings	1,328,963	713,872
Total shareholders' equity	5,014,018	5,521,869
Total liabilities and shareholders' equity	$ 5,767,619	$ 6,338,157

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Accounts receivable, allowances	$ 2,663	$ 7,366
Preferred stock, par value	$ 0.002	$ 0.002
Preferred stock, shares authorized	8,000	8,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.002	$ 0.002
Common stock, shares authorized	992,000	992,000
Common stock, shares issued	583,671	659,372
Common stock, shares outstanding	583,671	659,372

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Net revenue	$ 3,393,040	$ 3,611,893	$ 2,807,687
Operating costs and expenses:
Cost of goods sold	1,465,805	1,473,274	1,227,096
Research and development	1,013,678	897,578	828,176
Selling and marketing	159,434	155,481	139,404
General and administrative	100,620	104,830	171,362
Amortization and write-off of acquired intangible assets	49,357	79,538	107,534
Total operating costs and expenses	2,788,894	2,710,701	2,473,572
Operating income	604,146	901,192	334,115
Interest and other income, net	14,913	9,270	8,995
Income before income taxes, net	619,059	910,462	343,110
Provision (benefit) for income taxes	3,968	6,333	(10,346)
Net income	$ 615,091	$ 904,129	$ 353,456
Net income per share:
Basic	$ 1.01	$ 1.39	$ 0.57
Diluted	$ 0.99	$ 1.34	$ 0.54
Weighted average shares:
Basic	607,857	648,347	623,934
Diluted	623,268	676,878	653,741

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Income (Deficit)
Beginning Balance (in shares) at Jan. 31, 2009		616,388
Beginning Balance at Jan. 31, 2009	$ 3,829,067	$ 1,233	$ 4,372,265	$ (718)	$ (543,713)
Shares issued pursuant to stock options and awards, net (in shares)	12,181	14,674
Shares issued pursuant to stock options and awards, net	$ 45,893	$ 29	45,864
Issuance of common stock under the employee stock purchase plan (in shares)		7,279
Issuance of common stock under the employee stock purchase plan	65,752	$ 15	65,737
Stock-based compensation	124,140		124,140
Tax benefit from employee stock transactions	(162)		(162)
Comprehensive income:
Unrealized gain/(loss) on available-for-sale investments, net of tax	77			77
Unrealized gain/(loss) on cash flow hedges	341			341
Other	(585)			(585)
Net income	353,456				353,456
Total comprehensive income	353,289
Ending Balance (in shares) at Jan. 30, 2010		638,341
Ending Balance at Jan. 30, 2010	$ 4,417,979	$ 1,277	4,607,844	(885)	(190,257)
Shares issued pursuant to stock options and awards, net (in shares)	13,959	15,077
Shares issued pursuant to stock options and awards, net	$ 108,615	$ 28	108,587
Issuance of common stock under the employee stock purchase plan (in shares)		10,885
Issuance of common stock under the employee stock purchase plan	57,338	$ 22	57,316
Stock-based compensation	118,857		118,857
Tax benefit from employee stock transactions	460		460
Repurchase of common stock	(87,486)	$ (10)	(87,476)
Repurchase of common stock		(4,931)
Comprehensive income:
Unrealized gain/(loss) on available-for-sale investments, net of tax	3,112			3,112
Unrealized gain/(loss) on cash flow hedges	(1,134)			(1,134)
Other	(1)			(1)
Net income	904,129				904,129
Total comprehensive income	906,106
Ending Balance (in shares) at Jan. 29, 2011		659,372
Ending Balance at Jan. 29, 2011	$ 5,521,869	$ 1,317	4,805,588	1,092	713,872
Shares issued pursuant to stock options and awards, net (in shares)	5,681	7,210
Shares issued pursuant to stock options and awards, net	$ 37,003	$ 11	36,992
Issuance of common stock under the employee stock purchase plan (in shares)		4,875
Issuance of common stock under the employee stock purchase plan	60,854	$ 10	60,844
Stock-based compensation	120,390		120,390
Tax benefit from employee stock transactions	3		3
Repurchase of common stock	(1,340,876)	$ (176)	(1,340,700)
Repurchase of common stock		(87,786)
Comprehensive income:
Unrealized gain/(loss) on available-for-sale investments, net of tax	537			537
Unrealized gain/(loss) on cash flow hedges	(848)			(848)
Other	(5)			(5)
Net income	615,091				615,091
Total comprehensive income	614,775
Ending Balance (in shares) at Jan. 28, 2012		583,671
Ending Balance at Jan. 28, 2012	$ 5,014,018	$ 1,162	$ 3,683,117	$ 776	$ 1,328,963

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Cash flows from operating activities:
Net income	$ 615,091	$ 904,129	$ 353,456
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	88,454	93,190	99,214
Stock-based compensation	119,863	118,405	126,599
Amortization and write-off of acquired intangible assets	49,357	79,538	107,534
Facility impairment		1,140	3,986
Other (income) expense, net	15,190	7,581	(3,271)
Excess tax benefits from stock-based compensation	(164)	(899)	(677)
Deferred income tax	(3,245)	4,113	13,356
Changes in assets and liabilities, net of assets acquired and liabilities assumed in acquisitions:
Restricted cash			24,500
Accounts receivable	54,550	(102,610)	(134,695)
Inventories	(101,109)	(3,655)	67,150
Prepaid expenses and other assets	30,736	50,236	(4,326)
Accounts payable	(47,095)	42,464	142,002
Accrued liabilities and other	(21,614)	(38,059)	(32,268)
Accrued employee compensation	(12,565)	21,210	33,292
Deferred income	(16,202)	16,765	15,661
Net cash provided by operating activities	771,247	1,193,548	811,513
Cash flows from investing activities:
Purchases of marketable securities	(1,851,696)	(1,262,767)	(804,979)
Purchases of strategic investments	(4,003)	(1,750)	(2,000)
Sales and maturities of investments	1,462,164	868,759	118,362
Cash paid for acquisitions, net	(93,916)	(29,446)
Proceeds from sale of equity investments		9,192
Purchases of technology licenses	(13,823)	(23,144)	(15,598)
Purchases of property and equipment	(88,779)	(90,173)	(39,814)
Net cash used in investing activities	(590,053)	(529,329)	(744,029)
Cash flows from financing activities:
Repurchase of common stock	(1,340,876)	(87,486)
Proceeds from employee stock plans	97,857	165,954	111,645
Principal payments on capital lease and term loan obligations	(511)	(1,940)	(1,787)
Excess tax benefits from stock-based compensation	164	899	677
Net cash provided by (used in) financing activities	(1,243,366)	77,427	110,535
Net increase in cash and cash equivalents	(1,062,172)	741,646	178,019
Cash and cash equivalents at beginning of period	1,847,074	1,105,428	927,409
Cash and cash equivalents at end of period	784,902	1,847,074	1,105,428
Supplemental cash flow information:
Cash paid for interest	722	144	297
Cash paid for income taxes, net	$ 14,096	12,239	4,836
Non-Cash Investing Activities:
Receivable from sale of equity investment		$ 1,068	$ 7,681

The Company and its Significant Accounting Policies:

12 Months Ended

Jan. 28, 2012

The Company and its Significant Accounting Policies:

Note 1 — The Company and its Significant Accounting Policies:

The Company

Marvell Technology Group Ltd., a Bermuda company (the “Company”), is a leading global semiconductor provider of high-performance application specific standard products. The Company’s core strength of expertise is the development of complex System-on-a-Chip devices leveraging its extensive technology portfolio of intellectual property in the areas of analog, mixed-signal, digital signal processing and embedded ARM-based microprocessor integrated circuits. The Company develops platforms that it defines as integrated hardware and software that incorporate digital computing technologies designed and configured to provide an optimal computing solution compared to individual components. The Company’s broad product portfolio includes devices for data storage, enterprise-class Ethernet data switching, Ethernet physical-layer transceivers, handheld cellular, Ethernet-based wireless networking, personal area networking, Ethernet-based PC connectivity, control plane communications controllers, video-image processing and power management solutions.

Basis of Presentation

The Company’s fiscal year is the 52- or 53-week period ending on the Saturday closest to January 31. In a 52-week year, each fiscal quarter consists of 13 weeks. The additional week in a 53-week year is added to the fourth quarter, making such quarter consist of 14 weeks. Fiscal years 2012, 2011 and 2010 were comprised of 52-week periods.

Certain reclassifications have been made to prior period balances in order to conform to the current period’s presentation.

Use of Estimates

The preparation of consolidated financial statements in conformity with generally accepted accounting principles in the United States (“GAAP”) requires management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an on-going basis, the Company evaluates its estimates, including those related to performance-based compensation, revenue recognition, provisions for sales returns and allowances, inventory excess and obsolescence, investment fair values, goodwill and other intangible assets, income taxes, litigation and other contingencies. In addition, the Company uses assumptions when employing the Monte Carlo simulation and Black-Scholes valuation models to calculate the fair value of stock-based awards granted. The Company bases its estimates of the carrying value of certain assets and liabilities on historical experience and on various other assumptions that are believed to be reasonable under the circumstances when these carrying values are not readily available from other sources. Actual results could differ from these estimates, and such differences could affect the results of operations reported in future periods.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated. The functional currency of the Company and its subsidiaries is the United States dollar.

Cash and Cash Equivalents

The Company considers all highly liquid investments with a maturity of three months or less from the date of purchase to be cash equivalents. Cash and cash equivalents consist of cash on deposit with banks, time deposits, federal agency notes, commercial paper and money market funds.

Restricted Cash

Restricted cash consisted of proceeds of insurance recoveries that the Company offset against payments that it was required to make in settlements related to the Company’s historic stock option granting practices. The final payments were made during fiscal 2010.

Investments

The Company’s marketable investments are classified as available-for-sale and are reported at fair value. Unrealized gains and losses of the Company’s available-for-sale securities are excluded from earnings and reported as a component of accumulated other comprehensive income. The Company assesses whether an other-than-temporary impairment loss on its available-for-sale and trading securities has occurred due to declines in fair value or other market conditions. Declines in fair value that are considered other-than-temporary are recorded as an impairment of investments in interest and other income within the consolidated statements of operations.

In general, investments with original maturities of greater than 90 days and remaining maturities of less than one year are classified as short-term investments. Investments with maturities beyond one year may also be classified as short-term based on their highly liquid nature and because such investments represent the investment of cash that is available for current operations.

The Company also has equity investments in privately-held companies. If the Company has the ability to exercise significant influence, but not control, over the investee, or if the investee is a partnership type investment, the Company accounts for the investments under the equity method. If the Company does not have the ability to exercise significant influence over the operations of the investee, the Company accounts for the investment under the cost method. Investments in privately-held companies are included in other non-current assets.

Impairment of Investments

If a debt security’s market value is below amortized cost and the Company either intends to sell the security or it is more likely than not that the Company will be required to sell the security before its anticipated recovery, the Company records an other-than-temporary impairment charge to interest and other income within the consolidated statements of operations. However, if an impairment is due to credit losses, the Company considers other credit factors to account for the impairment loss.

Investments in privately-held companies are subject to a periodic impairment review. Investments are considered impaired when the fair value is below the investment’s cost basis and the decline in value is judged to be other than temporary. This assessment is based on a qualitative and quantitative analysis, including, but not limited to, the investee’s revenue and earnings trends, available cash and liquidity, and the status of the investee’s products and the related market for such products.

Derivative Financial Instruments

The Company accounts for its derivative instruments as either assets or liabilities and carries them at fair value. Derivatives that are not defined as hedges must be adjusted to fair value through earnings. For derivative instruments that hedge the exposure to variability in expected future cash flows and are designated as cash flow hedges, the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income in shareholders’ equity and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument is recognized in current earnings. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions.

Concentration of Credit Risk and Significant Customers

Financial instruments that potentially subject the Company to a significant concentration of credit risk consist principally of cash equivalents, short-term investments and accounts receivable. Cash, Cash equivalents and short-term investment balances are maintained with high quality financial institutions, the composition and maturities of which are regularly monitored by management. The Company believes that the concentration of credit risk in its trade receivables with respect to its served markets, as well as the customer base located primarily in the Asia Pacific Region, are substantially mitigated by the Company’s credit evaluation process, relatively short collection terms and the high level of credit worthiness of its customers. The Company performs ongoing credit evaluations of its customers’ financial conditions and limits the amount of credit extended when deemed necessary based upon payment history and the customer’s current credit worthiness, but generally requires no collateral. The Company regularly reviews the allowance for bad debt and doubtful accounts by considering factors such as historical experience, credit quality, age of the accounts receivable balances and current economic conditions that may affect a customer’s ability to pay.

The allowance for doubtful accounts at January 28, 2012, January 29, 2011 and January 30, 2010 was $1.3 million, 1.2 million and $1.0 million, respectively. Please see “Note 1 – The Company and its Significant Accounting Policies – Revenue Recognition” for additional information on sales returns and allowances.

The following table sets forth sales to end customers comprising 10% or more of the Company’s net revenue for the periods indicated:


	Year Ended
Customer	January 28, 2012			January 29, 2011			January 30, 2010
Western Digital		19	%		21	%		24	%
Research in Motion		*			14	%		*
Toshiba		*			*			15	%

*	Less than 10% of net revenue

Subsequent to the end of fiscal 2012, Western Digital acquired Hitachi’s HDD unit. If this acquisition had occurred at the beginning of fiscal 2012, Western Digital would have represented 24% of net revenue in fiscal 2012. During fiscal 2012, Seagate acquired the HDD operations of Samsung. If this acquisition had occurred at the beginning of fiscal 2012, Seagate would have represented 11% of net revenue in fiscal 2012.

The Company’s accounts receivable were concentrated with three customers at January 28, 2012 representing 15%, 12% and 11% of gross accounts receivable, respectively, and were concentrated with four customers at January 29, 2011 representing 13%, 12%, 12% and 11% of gross accounts receivable, respectively.

In fiscal 2012, one distributor accounted for more than 10% of the Company’s net revenue, and in each of fiscal 2011 and 2010, no distributor accounted for more than 10% of the Company’s net revenue. The Company continuously monitors the creditworthiness of its distributors and believes these distributors’ sales to diverse end customers and to diverse geographies further serve to mitigate the Company’s exposure to credit risk.

Inventories

Inventory is stated at the lower of cost or market. The Company records inventory excess and obsolescence provisions for estimated obsolete or unsellable inventory equal to the difference between the cost of inventory and estimated net realizable value based upon assumptions about future demand and market conditions. If actual future demand for the Company’s products is less than currently forecasted, additional inventory provisions may be required. Once a provision is recorded, it is maintained until the product to which it relates to is sold or otherwise disposed of. During fiscal 2012, the Company recorded $4.4 million of step-up fair market value adjustments to inventory acquired in acquisitions, based on the estimated selling price less reasonable profit allowance for the selling effort. Shipping and handling costs are classified as a component of cost of goods sold in the consolidated statements of operations.

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which ranges from three to seven years for machinery and equipment, computer software, and furniture and fixtures. Buildings are depreciated over an estimated useful life of 30 years and building improvements are depreciated over estimated useful lives of 15 years.

Goodwill

Goodwill is recorded when the consideration paid for a business acquisition exceeds the fair value of net tangible and intangible assets acquired. Goodwill is measured and tested for impairment on an annual basis during the fourth fiscal quarter or more frequently if the Company believes indicators of impairment exist. The performance of the test involves a two-step process. The first step requires comparing the fair value of the reporting unit to its net book value, including goodwill. As the Company has only one reporting unit, the fair value of the reporting unit is determined by taking the market capitalization of the Company as determined through quoted market prices and adjusted for control premiums and other relevant factors. A potential impairment exists if the fair value of the reporting unit is lower than its net book value. The second step of the process is only performed if a potential impairment exists, and it involves determining the difference between the fair value of the reporting unit’s net assets other than goodwill and the fair value of the reporting unit. If the difference is less than the net book value of goodwill, impairment exists and is recorded. In the event that the Company determines that the value of goodwill has become impaired, the Company will record an accounting charge for the amount of impairment during the fiscal quarter in which the determination is made. The Company has not been required to perform this second step of the process because the fair value of the reporting unit has significantly exceeded its net book value at every measurement date.

Long-Lived Assets and Intangible Assets

Long-lived assets include property and equipment, technology licenses and intangible assets. Whenever events or changes in circumstances indicate that the carrying amount of long-lived assets may not be recoverable, the Company estimates the future cash flows, undiscounted and without interest charges, expected to result from the use of those assets and their eventual cash position. If the sum of the expected future cash flows is less than the carrying amount of those assets, the Company recognizes an impairment loss based on the excess of the carrying amount over the fair value of the assets. Please see “Note 7 – Goodwill and Acquired Intangible Assets” for further details regarding impairment of acquisition-related identified intangible assets.

Acquisition-related identified intangible assets are amortized on a straight-line basis over their estimated economic lives of one to seven years for purchased technology, one to eight years for core technology, one to five years for customer intangibles, and one to five years for trade name. In-process research and development (“IPR&D”) is not depreciated until the completion of the related development.

Foreign Currency Transactions

The functional currency of all of the Company’s non-United States operations is the United States dollar. Monetary accounts maintained in currencies other than the United States dollar are re-measured using the foreign exchange rate at the balance sheet date. Operational accounts and nonmonetary balance sheet accounts are measured and recorded at the rate in effect at the date of the transaction. The effects of foreign currency re-measurement are reported in current operations.

Revenue Recognition

The Company recognizes revenues when there is persuasive evidence of an arrangement, delivery has occurred, the fee is fixed or determinable, and collection is reasonably assured.

Product revenue is generally recognized upon shipment of product to customers, net of accruals for estimated sales returns and rebates. However, some of the Company’s sales are made through distributors under agreements allowing for price protection, shipped from stock pricing adjustment rights, and limited rights of stock rotation on products unsold by the distributors. Although title passes to the distributor upon shipment terms and payment by the Company’s distributors is not contingent on resale of the product, product revenue on sales made through distributors with price protection, shipped from stock pricing adjustment rights and stock rotation rights are deferred until the distributors sell the product to end customers. Deferred revenue less the related cost of the inventories is reported as deferred income. The Company does not believe that there is any significant exposure related to impairment of deferred cost of sales, as its historical returns have been minimal and inventory turnover for its distributors generally ranges from 60 to 90 days. The Company’s sales to direct customers are made primarily pursuant to standard purchase orders for delivery of products.

A portion of the Company’s net revenue is derived from sales through third party logistics providers, who maintain warehouses in close proximity to, and often located directly in the customer’s facilities. Revenue from sales through these third party logistics providers is not recognized until the product is pulled from stock by the customer.

The provision for estimated sales returns on product sales is recorded in the same period the related revenues are recorded. These estimates are based on historical returns, analysis of credit memo data and other known factors. Actual returns could differ from these estimates. The Company accounts for rebates by recording reductions to revenue for rebates in the same period that the related revenue is recorded. The amount of these reductions is based upon the terms included in the Company’s various rebate agreements.

Advertising Expense

Advertising costs are expensed as incurred.

Stock-Based Compensation

Stock-based compensation is measured at the grant date, based on the fair value of the award, and is recognized as expense over the requisite service period. The Company amortizes stock-based compensation expense for time-based and market-based awards under the straight-line attribution method over the vest term which is generally four years for annual grants to employees and five years for new hire grants. Performance-based awards are amortized using the accelerated method.

The fair value of restricted stock units is based on the fair market value of the Company’s common shares on the date of grant. The Company estimates the fair value of stock option awards with time-based vesting on the date of grant using the Black Scholes option-pricing model. The fair value of option awards with market-based vesting provisions is estimated on the date of grant using a Monte Carlo simulation model. The value of the portion of the awards that is ultimately expected to vest is recognized as expense over the requisite service periods. The Black Scholes and Monte Carlo models incorporate various highly subjective assumptions including expected term of awards, expected future stock price volatility and expected forfeiture rates.

In developing estimates used to calculate assumptions, the Company establishes the expected term for employee options, as well as expected forfeiture rates, based on the historical settlement experience and after giving consideration to vesting schedules. Assumptions for option exercises and pre-vesting terminations of options were stratified by employee groups with sufficiently distinct behavior patterns.

Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from initial estimates. Stock-based compensation expense is recorded net of estimated forfeitures such that expense is recorded only for those stock-based awards that are expected to vest. Previously recognized expense is reversed for the portion of awards forfeited prior to vesting as and when forfeitures occurred.

Comprehensive Income

Comprehensive income is comprised of net income and unrealized gains and losses on available-for-sale securities and foreign exchange contracts. For fiscal 2012, 2011 and 2010, net unrealized gains (losses) were reclassified as realized gains (losses) and recognized in the accompanying statement of operations upon the sale of the related marketable investments and maturity of the related contracts of $(0.3) million, $2.0 million and $(0.2) million, respectively.

Accumulated other comprehensive income, as presented on the accompanying balance sheets, consists of net unrealized gains and losses on available-for-sale securities and foreign exchange contracts, net of tax.

Accounting for Income Taxes

In accordance with Accounting Standards Codification (“ASC”) Topic 740, “Income Taxes” (“ASC 740”), the Company recognizes income taxes using an asset and liability approach. This approach requires the recognition of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in the Company’s consolidated financial statements or tax returns. The measurement of current and deferred taxes is based on provisions of the enacted tax law and the effects of future changes in tax laws or rates are not anticipated.

Evaluating the need for an amount of a valuation allowance for deferred tax assets often requires judgment and analysis of all the positive and negative evidence available to determine whether all or some portion of the deferred tax assets will not be realized. A valuation allowance must be established for deferred tax assets when it is more likely than not that they will not be realized. Based on the available evidence and judgment, the Company has determined that it is more likely than not that U.S. research credits and certain acquired net operating losses will not be realized and therefore the Company has provided a full valuation allowance against these credits. If there is a change in the Company’s ability to realize its deferred tax assets, then the Company’s tax provision may decrease in the period in which it determines that realization is more likely than not.

As a multinational corporation, the Company conducts its business in many countries and is subject to taxation in many jurisdictions. The taxation of the Company’s business is subject to the application of various and sometimes conflicting tax laws and regulations as well as multinational tax conventions. The Company’s effective tax rate is highly dependent upon the geographic distribution of its worldwide earnings or losses, the tax regulations and tax holidays in each geographic region, the availability of tax credits and carryforwards, and the effectiveness of its tax planning strategies. The application of tax laws and regulations is subject to legal and factual interpretation, judgment and uncertainty. Tax laws themselves are subject to change as a result of changes in fiscal policy, changes in legislation, and the evolution of regulations and court rulings. Consequently, taxing authorities may impose tax assessments or judgments against the Company that could materially impact its tax liability and/or its effective income tax rate.

The Company is subject to income tax audits by the respective tax authorities in all of the jurisdictions in which the Company operates. The Company recognizes the effect of income tax positions only if these positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is more than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest and penalties related to unrecognized tax benefits in income tax expense. The calculation of the Company’s tax liabilities involves the inherent uncertainty associated with the application of GAAP and complex tax laws. The Company believes it has adequately provided in its financial statements for additional taxes that it estimates may be required to be paid as a result of such examinations. While the Company believes that it has adequately provided for all tax positions, amounts asserted by tax authorities could be greater or less than the Company’s accrued position. These tax liabilities, including the interest and penalties, are released pursuant to a settlement with tax authorities, completion of audit or expiration of various statutes of limitation. The material jurisdictions in which the Company may be subject to potential examination by tax authorities throughout the world include China, Israel, Singapore, Switzerland and the United States.

Warranty

The Company’s products are generally subject to warranty, which provides for the estimated future costs of repair, replacement or customer accommodation upon shipment of the product. The Company’s products carry a standard 90 day warranty, with certain exceptions in which the warranty period can extend to more than one year based on contractual agreements. The warranty accrual is primarily estimated based on historical claims compared to historical revenues and assumes that the Company will have to replace products subject to a claim. For new products, the Company uses a historical percentage for the appropriate class of product. From time to time, the Company becomes aware of specific warranty situations, and it records specific accruals to cover these exposures.

Recent Accounting Pronouncements

In May 2011, the Financial Accounting Standards Board (“FASB”) issued additional guidance on fair value measurements and related disclosures. The new guidance clarifies the application of existing guidance on fair value measurement for non-financial assets and requires the disclosure of quantitative information about the unobservable inputs used in a fair value measurement. This guidance is effective on a prospective basis for interim and annual periods beginning after December 15, 2011. The adoption of this guidance during the three months ended April 28, 2012 will not have any impact on the Company’s financial statements.

In June 2011, the FASB issued an amendment to the guidance regarding the presentation of comprehensive income. The amended guidance gives an entity the option to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amended guidance eliminates the option to present the components of other comprehensive income as part of the statement of changes in stockholders’ equity. This guidance is effective on a retrospective basis for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2011.

In September 2011, the FASB issued an amendment to the guidance regarding the testing of goodwill for impairment. The amended guidance will allow an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity no longer will be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. The amended guidance is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. The adoption of this guidance during the three months ended April 28, 2012 will not have any impact on the Company’s financial statements.

Business Combinations:

12 Months Ended

Jan. 28, 2012

Business Combinations:

Note 2 — Business Combinations:

Acquisitions in fiscal 2012

In April 2011, the Company acquired the PHY business of a company, which specializes in the design of networking devices. Under the purchase method of accounting, the total purchase price was determined to be $16.3 million and was allocated to tangible asset for $1.1 million, intangible assets for $13.6 million and goodwill for $1.6 million.

In December 2011, the Company acquired Xelerated AB (“Xelerated”), a company which specializes in network processing and programmable Ethernet switching solutions. The total purchase price was $75.2 million in cash, net of cash acquired. In addition to leveraging the existing acquired business and customer base, the objective of the acquisition is to expand the Company’s technology portfolio and enable more comprehensive integrated solutions for the networking market. The goodwill of $22.3 million is attributed to synergies specific to the Company in delivering these integrated solutions with its product portfolio, as well as the assembled workforce.

The terms of the Xelerated acquisition included contingent consideration of up to $5.0 million, based on specific revenue targets for the acquired business during calendar year 2011. Based on the actual results through the date of acquisition, the Company assessed there was no possibility of any of the earnout being paid, therefore the Company assigned no value to the contingent consideration. Subsequent to the end of the calendar year, the Company concluded that the earnout requirements were not met.

The purchase price of Xelerated was allocated as follows:


	(In thousands)
Accounts receivable	$	2,407
Inventory		6,481
Prepaid and other current assets		111
Property, plant and equipment		441

Tangible assets acquired		9,440
Goodwill		22,324
Intangible assets		51,800

Total assets acquired		83,564
Accounts payable		(256	)
Accrued liabilities		(7,152	)
Deferred tax liability		(1,000	)

Net assets acquired	$	75,156

Costs that were recognized separately from the acquisition were not significant and were expensed during the three months ended January 28, 2012. In addition to the consideration for the acquisition, the agreement includes retention bonuses totaling $4.3 million in cash over the next two years. These amounts will be expensed as compensation expense over the course of the retention period, as payment is contingent upon future employment.

The acquired intangible assets from Xelerated were recognized as follows based upon their fair value as of the acquisition date.


	Fair value (In thousands)		Estimated useful lives (in years)
Intangible assets:
Purchased technology	$	25,800		6
Customer intangible		24,700		5
Trade name		1,300		5

Total	$	51,800

The value of the purchased technology and trade name of $25.8 million and $1.3 million, respectively, were determined based on the relief from royalty method, and the value of customer intangible was determined using discounted cash flows.

Acquisitions in prior years

In July 2010, the Company purchased the assets of a company engaged in the development of powerline communications for home networking and broadband over powerline applications. Under the purchase method of accounting, the total purchase price of $20.7 million was allocated to tangible and intangible assets based on their fair values as of the date of the completion of the purchase. The Company recorded the purchase price allocation to tangible assets of $0.3 million, amortizable intangible assets of $7.8 million, IPR&D of $9.7 million and goodwill of $2.9 million.

In December 2010, the Company completed the acquisition of a mobile software consulting firm specializing in user interface application software. The purchase consideration was determined to be $11.8 million and was allocated to intangible assets based on their fair values as of the date of the completion of the purchase under the purchase method of accounting. The Company recorded the purchase price allocation to amortizable intangible assets of $7.5 million and goodwill of $4.3 million. Additional consideration of $9.3 million, which will be paid to employees, is contingent on continuing employment and therefore will be expensed as compensation during the two years following the close of the acquisition.

The completed acquisitions in fiscal 2012 and 2011 both individually and in the aggregate were not significant to the Company’s consolidated statements of operations. The goodwill acquired is not deductible for tax purposes.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Appendix F
-Paragraph F4
-Subparagraph e

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1490-128463

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 805
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e7000-128479

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1486-128463

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1383-128463

+ Details

Investments:

12 Months Ended

Jan. 28, 2012

Investments:

Note 3 — Investments:

The following tables summarize the Company’s investments (in thousands):


	As of January 28, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	685,563	$	3,081	$	(799	)	$	687,845
Foreign government		2,033		3		—			2,036
U.S. federal and state debt securities		770,298		1,437		(20	)	$	771,715

Total short-term investments	$	1,457,894	$	4,521	$	(819	)	$	1,461,596
Long-term investments:
Available-for-sale:
Auction rate securities	$	24,500	$	—	$	(1,285	)	$	23,215

Total long-term investments	$	24,500	$	—	$	(1,285	)	$	23,215

Total investments	$	1,482,394	$	4,521	$	(2,104	)	$	1,484,811


	As of January 29, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	648,278	$	3,208	$	(213	)	$	651,273
U.S. federal and state debt securities		431,174		561		(52	)		431,683

Total short-term investments	$	1,079,452	$	3,769	$	(265	)	$	1,082,956
Long-term investments:
Available-for-sale:
Auction rate securities	$	27,850	$	—	$	(1,624	)	$	26,226

Total long-term investments	$	27,850	$	—	$	(1,624	)	$	26,226

Total investments	$	1,107,302	$	3,769	$	(1,889	)	$	1,109,182

The investment in foreign government debt as of January 28, 2012 was in Canadian province debt. As of January 28, 2012, the Company’s investment portfolio included $24.5 million in par value of auction rate securities. To estimate the fair value of the auction rate securities, the Company uses a discounted cash flow model based on estimated timing and amount of future interest and principal payments. In developing the cash flow model, the company considers the credit quality and liquidity of the underlying securities and related issuer, the collateralization of underlying security investments, and other considerations. As of January 28, 2012, the fair value of the auction rate securities was $1.3 million less than the par value and was recorded in long-term investments.

Based on the Company’s assessment of its cash flow projections, a balance of approximately $2.2 billion in cash, cash equivalents and short-term investments and the fact that the Company continues to generate positive cash flow from operations on a quarterly basis, the Company does not anticipate having to sell these securities below par value and does not have the intent to sell these auction rate securities until recovery. Thus, the Company considers the impairment to be temporary and recorded the unrealized loss to accumulated other comprehensive income, a component of shareholders’ equity.

The contractual maturities of available-for-sale securities at January 28, 2012 and January 29, 2011 are presented in the following table (in thousands):


	January 28, 2012				January 29, 2011
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	641,433	$	642,317	$	560,190	$	560,999
Due between one and five years		816,461		819,279		519,262		521,957
Due over five years		24,500		23,215		27,850		26,226

	$	1,482,394	$	1,484,811	$	1,107,302	$	1,109,182

The following table shows those fair value and unrealized losses for those investments with gross unrealized losses, aggregated by length of time that individual securities have been in a continuous unrealized loss position (in thousands):


	January 28, 2012
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	146,963	$	(799	)	$	—	$	—		$	146,963	$	(799	)
U.S. federal and state debt securities		107,603		(20	)		—		—			107,603		(20	)
Auction rate securities		—		—			23,215		(1,285	)		23,215		(1,285	)

Total securities	$	254,566	$	(819	)	$	23,215	$	(1,285	)	$	277,781	$	(2,104	)


	January 29, 2011
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	113,081	$	(213	)	$	—	$	—		$	113,081	$	(213	)
U.S. Federal and State debt securities		91,962		(52	)		—		—			91,962		(52	)
Auction rate securities		—		—			26,226		(1,624	)		26,226		(1,624	)

Total securities	$	205,043	$	(265	)	$	26,226	$	(1,624	)	$	231,269	$	(1,889	)

Supplemental Financial Information (in thousands):

12 Months Ended

Jan. 28, 2012

Supplemental Financial Information (in thousands):

Note 4 — Supplemental Financial Information (in thousands):

Cash and cash equivalents


	January 28, 2012		January 29, 2011
Cash	$	503,095	$	340,236
Cash equivalents:
Commercial paper		12,500		9,797
Time deposits		205,060		159,938
Money market mutual fund		64,247		1,230,616
Federal agency notes		—		106,487

Total cash and cash equivalents	$	784,902	$	1,847,074

Inventories


	January 28, 2012		January 29, 2011
Work-in-process	$	190,779	$	156,108
Finished goods		163,340		89,340

Inventories	$	354,119	$	245,448

Property and equipment, net


	January 28, 2012			January 29, 2011
Machinery and equipment	$	489,481		$	435,900
Buildings		144,596			144,596
Computer software		81,852			74,966
Land		69,246			69,246
Building improvements		42,083			41,200
Leasehold improvements		37,237			34,142
Furniture and fixtures		24,450			23,498
Construction in progress		9,846			8,469

		898,791			832,017
Less: Accumulated depreciation and amortization		(514,990	)		(473,577	)

Property and equipment, net	$	383,801		$	358,440

The Company recorded depreciation expense of $63.5 million, $72.2 million and $87.3 million for fiscal 2012, 2011 and 2010, respectively.

Other non-current assets


	January 28, 2012		January 29, 2011
Technology and other licenses	$	50,212	$	51,642
Deferred tax assets		31,064		27,671
Deferred compensation		5,419		6,169
Prepayments for foundry capacity		759		5,289
Severance fund		1,734		4,819
Investments in privately held companies		6,309		3,950
Other		12,649		11,840

Other non-current assets	$	108,146	$	111,380

During fiscal 2011, the Company sold a $2.3 million investment in a privately held company for proceeds of $10.2 million. The gain on the sale of $7.9 million was recorded in interest and other income on the consolidated statement of operations. In addition to the initial proceeds, the purchase agreement contained earn-out provisions whereby additional gains could be recognized if the related operations met specific operational targets during calendar year 2011. The Company did not recognize any gain during fiscal 2012 as the targets were not achieved by the related company. Amortization of technology and other licenses was $24.9 million, $21.0 million, and $11.7 million in fiscal 2012, 2011, and 2010, respectively.

Accrued liabilities


	January 28, 2012		January 29, 2011
Accrued rebates	$	24,420	$	32,405
Accrued royalties		16,896		14,018
Accrued legal expense		13,999		8,551
Accrued fees for tax, audit and other professional services		1,553		2,125
Customer advances for NRE services		4,170		3,515
Technology license obligations		5,250		4,850
Accrued sales/goods and services tax		1,218		3,679
Other		20,149		16,851

Accrued liabilities	$	87,655	$	85,994

Other long-term liabilities


	January 28, 2012		January 29, 2011
Technology license obligations	$	11,255	$	19,218
Long-term accrued employee compensation		10,059		9,258
Long-term facilities consolidation		2,136		3,271
Accrued severance		1,983		3,226
Other		7,035		4,367

Other long-term liabilities	$	32,468	$	39,340

Net income per share

The computations of basic and diluted net income per share are presented in the following table (in thousands, except per share amounts):


	Year Ended
	January 28, 2012		January 29, 2011		January 30, 2010
Numerator:
Net income:	$	615,091	$	904,129	$	353,456

Denominator:
Weighted average common shares outstanding:
Weighted average shares — basic		607,857		648,347		623,934
Effect of dilutive securities:
Common share options and other		15,411		28,531		29,807

Weighted average shares — diluted		623,268		676,878		653,741

Net income per share:
Basic	$	1.01	$	1.39	$	0.57
Diluted	$	0.99	$	1.34	$	0.54

Options to purchase 21.0 million common shares at a weighted average exercise price of $18.79 have been excluded from the computation of diluted net income per share for fiscal 2012 because including them would have been anti-dilutive.

Options to purchase 12.2 million common shares at a weighted average exercise price of $21.39 have been excluded from the computation of diluted net income per share for fiscal 2011 because including them would have been anti-dilutive.

Options to purchase 14.3 million common shares at a weighted average exercise price of $13.28 have been excluded from the computation of diluted net income per share for fiscal 2010 because including them would have been anti-dilutive.

In addition, as of January 28, 2012, options to purchase 3.1 million shares that contain a market-based condition for vesting have been excluded from the computation of diluted net income per share for fiscal 2012, as the market value of the Company’s shares as of January 28, 2012 was lower than the required market condition. Please see “Note 9 – Stock-Based Compensation” for additional details.

Comprehensive income (in thousands)

The changes in the components of other comprehensive income were as follows (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Net income	$	615,091		$	904,129		$	353,456
Other comprehensive income
Net unrealized gain on marketable securities		198			2,417			1,087
Net unrealized gain (loss) on auction rate securities		339			695			(1,010	)
Net unrealized gain (loss) on cash flow hedges		(848	)		(1,134	)		341
Other		(5	)		(1	)		(585	)

Total comprehensive income	$	614,775		$	906,106		$	353,289

The components of accumulated other comprehensive income were as follows (in thousands):


	January 28, 2012			January 29, 2011
Unrealized gain on marketable securities	$	3,702		$	3,504
Unrealized loss on auction rate securities		(1,285	)		(1,624	)
Unrealized loss on cash flow hedges		(1,641	)		(793	)
Other		—			5

Accumulated other comprehensive income	$	776		$	1,092

Derivative Financial Instruments:

12 Months Ended

Jan. 28, 2012

Derivative Financial Instruments:

Note 5 — Derivative Financial Instruments:

The Company manages some of its foreign currency exchange rate risk through the purchase of foreign currency exchange contracts that hedge against the short term impact of currency fluctuations. The Company’s policy is to enter into foreign currency forward contracts with maturities generally less than 12 months that mitigate the impact of rate fluctuations on certain local currency denominated operating expenses. All derivatives are recorded at fair value in either prepaid expenses and other current assets or accrued liabilities. The Company reports cash flows from derivative instruments in cash flows provided by operating activities. The Company uses quoted prices to value its derivative instruments.

As of January 28, 2012, the notional amounts of outstanding forward contracts were as follows (in thousands):


	January 28, 2012				January 29, 2011
	Buy Contracts		Sell Contracts		Buy Contracts		Sell Contracts
Israeli shekel	$	42,637	$	—	$	56,360	$	—
Euro		—		—		—		3,698

	$	42,637	$	—	$	56,360	$	3,698

Cash Flow Hedges. The Company designates and documents its foreign currency forward exchange contracts as cash flow hedges for certain operating expenses denominated in Israeli shekels. The Company evaluates and calculates the effectiveness of each hedge at least quarterly. The effective change is recorded in accumulated other comprehensive income and is subsequently reclassified to operating expense when the hedged expense is recognized. Ineffectiveness is recorded in interest and other income.

Other Foreign Currency Forward Contracts. The Company enters into foreign currency forward exchange contracts to hedge certain assets and liabilities denominated in various foreign currencies that it does not designate as hedges for accounting purposes. The maturities of these contracts are generally less than 12 months. Gains or losses arising from the remeasurement of these contracts to fair value each period are recorded in interest and other income.

The fair value of foreign exchange contract derivatives was not significant as of any period presented.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Fair Value Measurements:

12 Months Ended

Jan. 28, 2012

Fair Value Measurements:

Note 6 — Fair Value Measurements:

Fair value is an exit price representing the amount that would be received in the sale of an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. As a basis for considering such assumptions, the accounting guidance establishes a three-tier value hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:

Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2 — Include other inputs that are directly or indirectly observable in the marketplace.

Level 3 — Unobservable inputs that are supported by little or no market activity.

The fair value hierarchy also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

The Company measures its cash equivalents and marketable securities at fair value. The Company’s cash equivalents and marketable securities are primarily classified within Level 1 with the exception of its investments in auction rate securities, which are classified within Level 3. Cash equivalents and marketable securities are valued primarily using quoted market prices utilizing market observable inputs. The Company’s investments in corporate debt securities are classified within Level 2 as the market inputs to value these instruments consist of market yields, reported trades and broker/dealer quotes, which are corroborated with observable market data. In addition, foreign currency contracts are classified within Level 2 as the valuation inputs are based on quoted prices and market observable data of similar instruments. The Company’s investments in auction rate securities are classified within Level 3 because there are no active markets for the auction rate securities and therefore the Company is unable to obtain independent valuations from market sources. Therefore, the auction rate securities were valued using a discounted cash flow model. Some of the inputs to the cash flow model are unobservable in the market. The total amount of assets measured using Level 3 valuation methodologies represented 0.4% of total assets as of January 28, 2012.

The tables below set forth, by level, the Company’s financial assets that were accounted for at fair value as of January 28, 2012 and January 29, 2011. The tables do not include assets and liabilities that are measured at historical cost or any basis other than fair value (in thousands):


	Level 1		Level 2		Level 3		Portion of Carrying Value Measured at Fair Value at January 28, 2012
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	64,247	$	—	$	—	$	64,247
Corporate debt securities		—		12,500		—		12,500
Time deposit		—		205,060		—		205,060
Short-term investments:
U.S. federal and state debt securities		771,715		—		—		771,715
Corporate debt securities		—		687,845		—		687,845
Foreign government		—		2,036		—		2,036
Long-term investments:
Auction rate securities		—		—		23,215		23,215
Other non-current assets:
Severance pay fund		—		1,734		—		1,734

Total assets	$	835,962	$	909,175	$	23,215	$	1,768,352

Liabilities
Accrued liabilities:

Forward contracts	$	—	$	1,520	$	—	$	1,520


	Level 1		Level 2		Level 3		Portion of Carrying Value Measured at Fair Value at January 29, 2011
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	1,230,616	$	—	$	—	$	1,230,616
US government and agencies		106,487		—		—		106,487
Corporate debt securities		—		9,797		—		9,797
Time deposit		—		159,938		—		159,938
Short-term investments:
US government and agencies		431,683		—		—		431,683
Corporate debt securities		—		651,273		—		651,273
Long-term investments:
Auction rate securities		—		—		26,226		26,226
Prepaid expense and other current assets:
Forward contracts		—		166		—		166
Other non-current assets:
Severance pay fund		2,425		2,394		—		4,819

Total assets	$	1,771,211	$	823,568	$	26,226	$	2,621,005

Liabilities
Accrued liabilities:

Forward contracts	$	—	$	804	$	—	$	804

The following table summarizes the change in fair values for Level 3 items for the year ended January 28, 2012:


	Level 3
Changes in fair value during the year (pre-tax):
Beginning balance at January 31, 2010	$	39,281
Purchases		—
Sales, redemption and settlement		(13,616	)
Realized loss on sale		(134	)
Unrealized gain included in accumulated other comprehensive income		695

Beginning balance at January 30, 2011	$	26,226
Purchases		—
Sales, redemption and settlement		(3,350	)
Realized loss on sale		—
Unrealized gain included in accumulated other comprehensive income		339

Ending balance at January 28, 2012	$	23,215

Assets measured and recorded at fair value on a non-recurring basis as of January 28, 2012 and January 29, 2011 were not significant and consisted primarily of assets held for sale.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Topic 820
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-Section 50
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Goodwill and Acquired Intangible Assets:

12 Months Ended

Jan. 28, 2012

Goodwill and Acquired Intangible Assets:

Note 7 — Goodwill and Acquired Intangible Assets:

Goodwill

The Company performed an annual assessment of goodwill impairment at the beginning of its fourth quarter of fiscal 2012 and 2011 and concluded that no impairment was necessary. The following table summarizes the activity related to the carrying value of goodwill (in thousands):


Balance at January 30, 2010	$	1,997,662
Additions due to business combinations		7,171

Balance at January 29, 2011	$	2,004,833
Additions due to business combinations		27,158

Balance at January 28, 2012	$	2,031,991

Acquired Intangible Assets

The carrying amounts of acquired intangible assets are as follows (in thousands):


		January 28, 2012							January 29, 2011
	Range of Useful Lives	Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amount		Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amount
Purchased technology	1 - 7 years	$	103,490	$	(50,906	)	$	52,584	$	64,125	$	(36,962	)	$	27,163
Core technology	1 - 8 years		178,000		(142,932	)		35,068		178,800		(121,509	)		57,291
Trade name	1 - 5 years		1,500		(232	)		1,268		200		(149	)		51
Customer intangible	4 - 7 years		89,900		(47,856	)		42,044		118,600		(88,174	)		30,426
IPR&D	*		10,541		—			10,541		9,700		—			9,700

Total intangible assets, net		$	383,431	$	(241,926	)	$	141,505	$	371,425	$	(246,794	)	$	124,631

Upon completion of the project, the related IPR&D assets will be amortized over its estimated useful life. If any of the projects are abandoned or the forecast of the project indicates that the fair value is less than the carrying amount, the Company will be required to impair the related IPR&D asset.

Intangible assets, along with the related accumulated amortization, are removed for purposes of the above table in the period they become fully amortized. In fiscal 2012 and 2011, the Company did not record any impairment of acquisition related intangible assets. In fiscal 2010, the Company wrote-off $1.0 million of acquisition related intangible assets.

Based on the identified intangible assets recorded at January 28, 2012, the future amortization expense of identified intangibles excluding IPR&D for the next five fiscal years is as follows (in thousands):


Fiscal year
2013	$	50,927
2014		36,254
2015		14,852
2016		12,088
2017		10,896
Thereafter		5,947

	$	130,964

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Restructuring:

12 Months Ended

Jan. 28, 2012

Restructuring:

Note 8 — Restructuring:

During fiscal 2010, the Company continued to implement certain cost reduction measures that included reductions in workforce that had been announced during the three months ended May 2, 2009. In addition, the Company also restructured some facilities due to vacating certain locations. As a result, during fiscal 2010, Company recorded a restructuring charge of $21.7 million consisting of $8.6 million of severance and related employee benefits to terminated employees, facilities and related charges of $3.9 million and equipment and other related charges of $9.1 million.

During fiscal 2011, the Company subleased two of its previously vacated facilities and thus recorded an adjustment to the restructuring liabilities.

During fiscal 2011, as a result of the anticipated sale of one of its facilities, the Company classified the carrying value of the building as held for sale within prepaid expenses and other current assets. This resulted in a charge of $1.1 million to write-down the carrying value to fair value in research and development. During fiscal 2012, the Company completed the sale of the building held for sale to an independent third party for $6.8 million, equal to the revised carrying value of the building.

During the three months ended January 28, 2012, the Company assumed the facility lease obligations through the Xelerated acquisition. The Company vacated the facility immediately after the completion of the acquisition and recorded insignificant amount of restructuring charge. In addition, the Company continued to make payments and incur on-going operating expenses from its previously vacated facilities during fiscal 2012.

The following table sets forth an analysis of the components of the restructuring charges and the payments made for the years ended (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Restructuring liabilities, beginning of period	$	3,306		$	5,397		$	7,685
Severance and related charges		—			—			8,640
Facilities and related charges		1,619			3,420			3,884
Equipment and other related charges		237			94			9,139
Non-cash adjustment		(506	)		(1,272	)		(4,882	)
Net cash payments		(1,739	)		(4,002	)		(19,069	)
Adjustments to previous assumptions		—			(331	)		—

Restructuring liabilities, end of period	$	2,917		$	3,306		$	5,397

The following table presents details of restructuring charges by functional line item (in thousands):


	January 28, 2012		January 29, 2011		January 30, 2010
Research and development	$	728	$	1,966	$	15,046
Selling and marketing		8		—		1,838
General and administrative		1,120		1,217		4,779

	$	1,856	$	3,183	$	21,663

The remaining restructuring liabilities will be paid out through fiscal 2018.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Shareholders' Equity:

12 Months Ended

Jan. 28, 2012

Shareholders' Equity:

Note 9 — Shareholders’ Equity:

Common and Preferred Stock

As of January 28, 2012, the Company is authorized to issue 992 million shares of $0.002 par value common stock and eight million shares of $0.002 par value preferred stock. As of January 28, 2012 and January 29, 2011, no shares of preferred stock were outstanding.

1995 Stock Option Plan

In April 1995, the Company adopted the 1995 Stock Option Plan (the “Option Plan”). The Option Plan, as amended from time to time, had 383.4 million common shares reserved for issuance thereunder as of January 28, 2012. Options granted under the Option Plan generally have a term of ten years and generally must be issued at prices equal to the fair market value of the stock on the date of grant. Incentive stock options granted to shareholders who own greater than 10% of the outstanding stock at the time of the grant may not have a term exceeding five years and these options must be issued at prices of at least 110% of the fair market value of the stock on the date of grant. The options generally vest 20% one year after the vesting commencement date, and the remaining shares vest one-sixtieth per month over the remaining 48 months. Options granted under the Option Plan subsequent to March 1, 2000 may only be exercised after vesting.

In addition, the Company can also grant stock awards, which may be subject to vesting. Further, the Company can grant restricted stock unit awards. Restricted stock unit awards are denominated in shares of stock, but may be settled in cash or shares upon vesting, as determined by the Company at the time of grant. As of January 28, 2012, 119.4 million shares remained available for future issuance under the Option Plan.

1997 Directors’ Stock Option Plan

In August 1997, the Company adopted the 1997 Directors’ Stock Option Plan (the “1997 Directors’ Plan”). Under the 1997 Directors’ Plan, an outside director was granted an option to purchase 30,000 common shares upon appointment to the Company’s Board of Directors. These options vested 20% one year after the vesting commencement date and remaining shares vest one-sixtieth per month over the remaining 48 months. An outside director was also granted an option to purchase 6,000 common shares on the date of each annual meeting of the shareholders. These options vested one-twelfth per month over 12 months after the fourth anniversary of the vesting commencement date. Options granted under the 1997 Directors’ Plan could be exercised prior to vesting. The 1997 Directors’ Plan was terminated in October 2007.

2007 Directors’ Stock Incentive Plan

In October 2007, the Company adopted the 2007 Directors’ Stock Incentive Plan (the “2007 Directors’ Plan”). Shareholders have approved 750,000 common shares for issuance, which is the total amount authorized under the 2007 Directors’ Plan. On March 15, 2012, the Board approved an amendment and restatement to revise the size of automatic annual awards under the 2007 Directors’ Plan. Prior to the amendment and restatement, each outside director was granted an option to purchase 50,000 common shares upon his or her initial appointment to the Company’s Board of Directors. These options vested one-third on the one year anniversary of the date of grant and one-third of the shares on each one-year anniversary thereafter.

In fiscal 2012, an outside director who had been serving on the Company’s Board of Directors for the prior six months was granted — upon re-election by the shareholders at the annual general meeting – an option to purchase 9,000 common shares immediately following each annual general meeting of shareholders. These options vest 100% on the earlier of the date of the next annual general meeting of shareholders or the one year anniversary of the date of grant. In addition, an outside director who had been serving on the Company’s Board of Directors for the prior six months was also granted a restricted stock unit award (the “Annual RSU Award”) that covered a number of shares with an aggregate fair market value as reported on the NASDAQ Global Select Market equal to $70,000 immediately following the annual general meeting of shareholders. These Annual RSU Awards vest 100% on the earlier of the date of the next annual general meeting of shareholders or the one year anniversary of the date of grant.

Beginning in fiscal 2013, each outside director who is appointed at the annual general meeting of shareholders, will be granted a stock option award that will cover a number of shares with an aggregate grant date fair value equal to $110,000 immediately following each annual general meeting of shareholders. In addition, each outside director will be granted an Annual RSU Award that will cover a number of shares with an aggregate fair market value equal to $110,000 immediately following each annual general meeting of shareholders. The annual stock option award and the Annual RSU Award vest 100% on the earlier of the date of the next annual general meeting of shareholders or the one year anniversary of the date of grant. An outside director who is elected or appointed after an annual general meeting of shareholders will receive a pro rata stock option award and restricted stock unit award based on the number of quarters completed since such annual general meeting of shares.

As of January 28, 2012, approximately 412,000 shares remained available for future issuance under the 2007 Directors’ Plan.

2000 Employee Stock Purchase Plan

Under the 2000 Employee Stock Purchase Plan, as amended and restated on October 31, 2011 (the “Restated Purchase Plan”), participants purchase the Company’s stock using payroll deductions, which may not exceed 15% of their total cash compensation. The Restated Purchase Plan had 26.3 million common shares reserved for issuance thereunder as of January 28, 2012. Pursuant to the terms of the Restated Purchase Plan, the “look-back” period for the stock purchase price was changed from six months to 24 months. This change was effective for the offering that began in December 2011 and is applicable for each successive offering period thereafter. Offering and purchase periods will continue to begin on December 8 and June 8 of each year. Participants enrolled in the new 24-month offering periods will continue in an offering period until the earlier of the end of the offering period or the reset of the offering period. A reset occurs if the fair market value of the Company’s common shares on any purchase date is less than it was on the first day of the offering period. Participants in the new 24-month offering periods will be granted the right to purchase common shares at a price per share that is 85% of the lesser of the fair market value of the shares at (i) the participant’s entry date into the two-year offering period or (ii) the end of each six-month purchase period within the offering period.

During fiscal 2012, a total of 4.9 million shares were issued under the Restated Purchase Plan at a weighted-average price of $12.48. During fiscal 2011, a total of 10.9 million shares were issued under the Restated Purchase Plan at a weighted-average price of $5.27. During fiscal 2010, a total of 7.3 million shares were issued under the Restated Purchase Plan at a weighted-average price of $4.95.

Option Plan and Stock Award Activity

During the first quarter of fiscal 2012, the Company issued 3.1 million stock options with a market-based condition for a group of senior employees. The Company believes that such awards better align the interests of those employees with the interests of its shareholders. If the market price condition is not met within five years from the date of grant, the options automatically expire.

The following table summarizes the activity under the Option Plan, the 2007 Directors’ Plan and other stock based arrangements (in thousands, except for per share amounts):


	Time-Based Options					Market-Based Options					Total
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Balance at January 31, 2009		85,054		$	10.81		—			—		85,054		$	10.81
Granted		1,819		$	13.85		—			—		1,819		$	13.85
Canceled/Forfeited		(3,726	)	$	15.45		—			—		(3,726	)	$	15.45
Expired		—			—		—			—		—			—
Exercised		(12,181	)	$	7.12		—			—		(12,181	)	$	7.12

Balance at January 30, 2010		70,966		$	11.28		—			—		70,966		$	11.28
Granted		2,018		$	20.17		—			—		2,018		$	20.17
Canceled/Forfeited		(2,700	)	$	18.47		—			—		(2,700	)	$	18.47
Expired		—			—		—			—		—			—
Exercised		(13,959	)	$	8.45		—			—		(13,959	)	$	8.45

Balance at January 29, 2011		56,325		$	11.96		—			—		56,325		$	11.96
Granted		3,477		$	15.31		3,149		$	15.43		6,626		$	15.37
Canceled/Forfeited		(1,654	)	$	14.57		(25	)	$	15.43		(1,679	)	$	14.58
Expired		—			—		—			—		—			—
Exercised		(5,681	)	$	7.95		—			—		(5,681	)	$	7.95

Balance at January 28, 2012		52,467		$	12.53		3,124		$	15.43		55,591		$	12.70

Vested or expected to vest at January 28, 2012		51,656		$	12.51		2,698		$	15.43		54,354		$	12.66

Exercisable at January 28, 2012		42,122		$	12.49		—			—		42,122		$	12.49

As a result of the Company’s acquisitions in prior to fiscal 2005, the Company assumed stock options previously granted by the acquired companies. As of January 28, 2012, a total of 124,904 common shares were reserved for issuance upon exercise of outstanding options assumed from the acquisitions. The related options are included in the preceding tables. The options vest over four to five years and have eight to ten year terms.

The aggregate intrinsic value and weighted average remaining contractual term of time-based stock options vested and expected to vest at January 28, 2012 was $234.7 million and 4.6 years, respectively. The aggregate intrinsic value and weighted average remaining contractual term of time-based stock options exercisable at January 28, 2012 was $198.5 million and 3.9 years, respectively.

The aggregate intrinsic value and weighted average remaining contractual term of market-based stock options vested and expected to reach the end of the vesting period at January 28, 2012 was $1.0 million and 9.2 years, respectively.

The aggregate intrinsic value of stock options exercised during fiscal 2012, 2011 and 2010 was $41.8 million, $162.9 million and $124.5 million, respectively.

The aggregate intrinsic value is calculated based on the Company’s closing stock price as reported on the NASDAQ Global Select Market for all in-the-money options as of January 27, 2012.

As of January 28, 2012, compensation costs related to stock options and restricted stock units not yet recognized amounted to $157.0 million.

The unamortized compensation expense for time-based and market-based stock options will be amortized on a straight-line basis and is expected to be recognized over a weighted-average period of 1.9 years. The unamortized compensation expense for restricted stock units will be amortized on a straight-line basis and is expected to be recognized over a weighted-average period of 1.5 years. Historically, the Company issued new shares to satisfy stock option exercises.

Included in the following table is activity related to the non-vested portion of the restricted stock units as follows (in thousands, except for share prices):


	Restricted Stock Outstanding			Weighted Average Grant Date Fair Value
Balance at January 31, 2009		6,499		$	9.58
Granted		78		$	13.49
Vested		(3,376	)	$	10.20
Canceled/Forfeited		(455	)	$	6.50

Balance at January 30, 2010		2,746		$	8.99
Granted		4,718		$	20.76
Vested		(1,619	)	$	9.13
Canceled/Forfeited		(359	)	$	13.87

Balance at January 29, 2011		5,486		$	18.75
Granted		6,877		$	15.80
Vested		(2,014	)	$	15.90
Canceled/Forfeited		(703	)	$	16.81

Balance at January 28, 2012		9,646		$	17.38

The aggregate intrinsic value of restricted stock units expected to vest as of January 28, 2012 was $133.1 million. The number of restricted stock units that are expected to vest is 8.4 million shares.

Stock-Based Compensation

The following table presents details of stock-based compensation expenses by functional line item (in thousands):


	Year Ended
	January 28, 2012		January 29, 2011		January 30, 2010
Cost of goods sold	$	6,995	$	7,522	$	10,690
Research and development		85,924		82,524		89,766
Selling and marketing		12,920		11,769		15,298
General and administrative		14,024		16,590		10,845

	$	119,863	$	118,405	$	126,599

Stock-based compensation of $2.1 million, $1.5 million and $1.6 million was capitalized in inventory as of January 28, 2012, January 29, 2011 and January 30, 2010, respectively.

Valuation Assumptions

The following weighted average assumptions were used for each respective period to calculate the fair value of each time-based equity award on the date of grant using the Black-Scholes option pricing model and of each market-based equity award using a Monte Carlo simulation model:

Time-based Stock Options


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Estimated fair value	$	6.05		$	9.33		$	6.32
Volatility		44	%		53	%		53	%
Expected term (in years)		4.8			4.7			4.6
Risk-free interest rate		2.0	%		2.2	%		2.1	%
Dividend yield		—			—			—

Market-based Stock Options


	Year Ended
	January 28, 2012
Estimated fair value	$	5.08
Expected Volatility		42	%
Risk-free interest rate		0.85 - 3.59	%
Dividend yield		—

The fair value of each market-based option award is estimated on the date of grant using a Monte Carlo simulation model that uses the assumptions noted in the above table, including the same volatility applied to the Company’s time-based options. Because a Monte Carlo simulation model incorporates ranges of assumptions for inputs, those ranges are disclosed where applicable. The Company uses historical data to estimate employee termination within the valuation model. The expected term of options granted of 2.66 years was derived from the output of the valuation model and represents the period of time that options granted are expected to be outstanding.

Employee Stock Purchase Plan


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Estimated fair value	$	4.63		$	5.91		$	4.34
Volatility		44	%		53	%		51	%
Expected term (in years)		1.1			0.5			1.1
Risk-free interest rate		0.1	%		0.2	%		0.6	%
Dividend yield		—			—			—

The expected volatility for awards granted during fiscal 2012 is based on an equally weighted combination of historical stock price volatility and implied volatility derived from traded options on the Company’s stock in the marketplace. The calculation of expected volatility for previous periods was based solely on historical stock price volatility. The Company believes that the combination of historical volatility and implied volatility provides a better estimate of future stock price volatility.

Share Repurchase Program

In August 2010, the Company announced that its board of directors had authorized a share repurchase program of up to $500 million of the Company’s common shares in open market, privately negotiated or block transactions.

In March, July and December 2011, the Company announced that its board of directors authorized the Company to repurchase up to an additional $500 million, respectively, for a total of $2.0 billion, of its outstanding common shares. The repurchase program is subject to market conditions and other factors and does not obligate the Company to repurchase any dollar amount or number of its common shares. The program may be extended, modified, suspended or discontinued at any time. The future repurchases, which are expected to be funded from the Company’s current cash and short-term investments position of over $2.2 billion, may occur in open market, privately negotiated or block transactions.

The Company repurchased 87.8 million common shares for $1.3 billion in cash during fiscal 2012 and repurchased 4.9 million common shares for $87.5 million in cash during fiscal 2011. The repurchased shares were retired immediately after the repurchases were completed.

As of January 28, 2012, the Company had completed share repurchases totaling $1.43 billion under its share repurchase program, with $571.6 million remaining available for repurchase under the program. Subsequent to fiscal 2012 year end and through March 16, 2012, the Company repurchased an additional 5.2 million common shares for $77.9 million at an average price per share of $15.12, bringing its total repurchases under the repurchase program to $1.51 billion.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Income Taxes:

12 Months Ended

Jan. 28, 2012

Income Taxes:

Note 10 — Income Taxes:

The U.S. and non-U.S. components of income before income taxes consist of the following (in thousands):


	Year Ended
	January 28, 2012		January 29, 2011		January 30, 2010
U.S. operations	$	28,039	$	22,647	$	12,714
Non-U.S. operations		591,020		887,815		330,396

	$	619,059	$	910,462	$	343,110

The provision for income taxes consists of the following (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Current income tax expense (benefit):
Federal	$	8,183		$	1,111		$	(35,778	)
State		99			49			576
Foreign		(1,069	)		3,282			11,500

Total current income tax expense		7,213			4,442			(23,702	)

Deferred income tax expense (benefit):
Federal		(1,361	)		7,025			(254	)
State		1,078			3,037			(556	)
Foreign		(2,962	)		(8,171	)		14,166

Total deferred income tax expense (benefit)		(3,245	)		1,891			13,356

Total provision (benefit) for income taxes	$	3,968		$	6,333		$	(10,346	)

Deferred tax assets consist of the following (in thousands):


	January 28, 2012			January 29, 2011
Deferred tax assets:
Federal and California research and other tax credits	$	259,635		$	225,695
Reserves and accruals		32,328			29,718
Stock compensation		2,678			2,880
Net operating losses		21,813			19,643

Gross deferred tax assets		316,454			277,936
Valuation allowance		(259,316	)		(224,853	)

Total deferred tax assets		57,138			53,083
Total deferred tax liabilities		(15,405	)		(14,595	)

Net deferred tax assets	$	41,733		$	38,488

The non-current portion of the deferred tax assets as of January 28, 2012 and January 29, 2011 was $31.1 million and $27.7 million, respectively, and is included with the other non-current assets. During fiscal 2012, deferred tax assets, net of a corresponding valuation allowance increased $3.2 million from the end of fiscal 2011, mostly due to the increase to the Israeli corporate tax rate that the Israeli Knesset approved on December 5, 2011.

As of January 28, 2012, the Company had net operating loss carryforwards available to offset future taxable income of approximately $84.9 million, $2.7 million and $7.5 million for foreign, U.S. federal and state of California purposes, respectively. The federal carryforwards will expire in various fiscal years between 2021 and 2031, and the California carryforwards will expire at various fiscal years between 2015 and 2022, if not utilized before these years. The losses in non-U.S. components can be carried forward indefinitely. The Company had, for U.S. federal income tax return purposes, research tax credit carryforwards of approximately $173.7 million that expire through fiscal 2032. As of January 28, 2012, the Company had unused California research and tax credit carryforwards of approximately $169.8 million, which can be carryforward indefinitely. Included in the U.S. federal and California carryforward amounts are $48.0 million and $49.9 million, respectively, that are attributable to excess tax benefits from stock options. Upon realization, the benefit associated with these credits will increase additional paid-in capital. The Company also has unused research tax credits and investment tax credit carryforwards of approximately $14.1 million in other U.S. states that expire through fiscal 2027 due to the statute of limitation.

During fiscal 2012, the Company generated research credits for U.S. federal and states far in excess of its current year tax liabilities. Based on the available objective positive and negative evidence, the Company has determined that it is more likely than not the federal and California research credits and certain acquired net operating losses will not be realized and therefore the Company has provided a full valuation allowance against these credits. It is not clear whether any of the research credit carryforward of $259.6 million will ever be used, therefore, the Company has recorded a valuation allowance on the entire research credit carryforward. The Company increased the net valuation allowance by $34.5 million from fiscal 2011, of which $34.7 million is related to an increase in research credits and a $0.2 million decrease in alternative minimum tax and U.S. net operating losses.

Reconciliation of the statutory federal income tax to the Company’s effective tax:


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Provision at U.S. notional statutory rate		35.0	%		35.0	%		35.0	%
Non-deductible stock-based compensation		6.9			5.6			13.3
Difference in U.S. and non-U.S. tax rates		(40.7	)		(40.0	)		(41.2	)
Benefits from utilization of general business credits		(6.8	)		(3.7	)		(20.3	)
Change in valuation allowance		5.6			3.4			18.4
Reserve		0.0			0.0			(9.2	)
Other		0.6			0.4			1.0

Effective tax rate		0.6	%		0.7	%		(3.0	)%

The following table reflects changes in the unrecognized tax benefits (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Unrecognized tax benefits as the beginning of the period	$	102,612		$	103,334		$	115,295
Increases related to prior year tax positions		987			494			—
Decreases related to prior year tax positions		(307	)		(149	)		(3,226	)
Increases related to current year tax positions		1,229			1,317			9,970
Settlements		(243	)		—			(2,191	)
Lapse in the statute of limitations		(9,529	)		(10,293	)		(22,682	)
Foreign exchange (gain) loss		1,545			7,909			6,168

Gross amounts of unrecognized tax benefits as of the end of the period	$	96,294		$	102,612		$	103,334

Included in the balances as of January 28, 2012 is $78.8 million of unrecognized tax benefit that would affect the effective income tax rate if recognized.

The amount of interest and penalties accrued as of January 28, 2012 was approximately $28.3 million and $7.0 million, respectively, as of January 29, 2011 was approximately $25.9 million and $7.5 million, respectively, and as of January 30, 2010 was approximately $22.2 million and $7.7 million, respectively.

The Company is subject to income tax audits by the respective tax authorities in all of the jurisdictions in which it operates. The examination of tax liabilities in each of these jurisdictions requires the interpretation and application of complex and sometimes uncertain tax laws and regulations. As of January 28, 2012, the material jurisdictions that are subject to examination include China, Israel, Singapore, Switzerland and the United States for the Company’s fiscal years 2002 through 2012. As of January 28, 2012, three of the Company’s non-U.S. entities are under examination, one for fiscal years 2006 through 2008, another for fiscal years 2007 and 2008, and the final for fiscal years 2005 through 2008.

During fiscal 2013, the Company will continue to review its tax positions and provide for or reverse unrecognized tax benefits as issues arise. During the next 12 months, it is reasonably possible that the amount of unrecognized tax benefits could decrease due to potential settlement with tax authorities and the expiration of applicable statutes of limitations. However, the amount cannot be reasonably estimated as the Company will have negotiations with various tax authorities throughout the year.

The Economic Development Board of Singapore granted Pioneer Status to the Company’s wholly-owned subsidiary in Singapore in July 1999. This tax exemption was to expire after ten years, but the Economic Development Board in June 2006 agreed to extend the term to 15 years. Fiscal 2012 and 2011 tax savings associated with this tax holiday were approximately $3.1 million and $7.9 million, respectively, which if paid would impact the Company’s earnings per share results by $0.01 and $0.01 per share, respectively As a result, the Company anticipates that a significant portion of the income it earns in Singapore during this period will be exempt from the Singapore income tax. The Company is required to meet several requirements as to investment, headcount and activities in Singapore to retain this status.

Under the Israeli Encouragement law of “approved or benefited enterprise,” two branches of Marvell Israel (“MISL”), the GTL branch and the cellular branch (formerly Marvell DSPC), are entitled to an approved and beneficial tax programs that includes reduced tax rates and exemption of certain income. The first program was approved for MISL in 1995 and the most recent was approved in 2003. Marvell DSPC has five approved programs with the first approved in 1990 and the most recent benefited enterprise approved in 2010. The benefit period is generally 10 to 15 years and begins in the first year in which the Company’s Israeli divisions earn taxable income from the approved or benefited enterprises, provided the maximum period has not elapsed. Income from the approved or benefited enterprises is subject to reduced tax rates ranging between 0% and 10% or tax exemptions for fiscal years 2008 through 2020. A new amendment to the Encouragement law, which was approved by the Israeli government in December 2011, came into effect January 1, 2012. For fiscal 2012 and fiscal 2011, the benefit associated with these approved or benefited enterprise programs was $13.6 million and $18.4 million, respectively, which provided earnings per share benefit of $0.02 and $0.03, respectively.

During fiscal 2007, the Swiss Federal Department of Economy and the Vaud Cantonal Tax Administration each granted Marvell Switzerland Sarl a total of a ten year tax holiday commencing with its fiscal year beginning January 29, 2006. The fiscal 2012 and 2011 tax savings associated with this tax holiday is approximately $4.7 million and $4.5 million, respectively, which provided an earnings per share benefit of less than $0.01 for both years.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Benefit Plans:

12 Months Ended

Jan. 28, 2012

Benefit Plans:

Note 11 — Benefit Plans:

The Company sponsors a 401(k) savings and investment plan that allows eligible U.S. employees to participate by making pre-tax contributions to the 401(k) plan ranging from 1% to 80% of eligible earnings subject to a required annual limit. The Company matches 100% of the employee contribution up to $500 per eligible employee on a quarterly basis. The participant must be employed by the Company on the last day of the calendar quarter to qualify for the match. At the end of the calendar year, the eligible employees receive a true-up match equal to the accumulated employee contribution for the calendar year up to $2,000. The Company made matching contributions to employees of $4.8 million, $4.5 million and $2.1 million during fiscal 2012, 2011 and 2010, respectively. As of January 28, 2012, the 401(k) plan offers a variety of investment alternatives, representing different asset classes. Employees may not invest in the Company’s common shares through the 401(k) plan.

The Company also has voluntary defined contribution plans in various non-U.S. locations. The Company made contributions on behalf of employees totaling $15.7 million, $15.6 million and $11.5 million during fiscal 2012, 2011 and 2010, respectively. The Company also maintains a limited number of defined benefit plans for certain non-U.S. locations. Total costs under these plans were not significant.

Commitments and Contingencies:

12 Months Ended

Jan. 28, 2012

Commitments and Contingencies:

Note 12 — Commitments and Contingencies:

Warranty Obligations

The Company’s products carry a standard 90 day warranty with certain exceptions in which the warranty period can extend to more than one year based on contractual agreements. The following table presents changes in the warranty accrual included in accrued liabilities in the Company’s Consolidated Balance Sheets (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Beginning balance	$	2,439		$	1,965		$	2,093
Warranty expense		1,126			2,291			3,108
Acquisitions		408			—			—
Payments and other charges		(1,619	)		(1,817	)		(3,236	)

Ending balance	$	2,354		$	2,439		$	1,965

Lease Commitments

The Company leases some of its facilities, equipment, and computer-aided design software under non-cancelable operating leases. Future minimum lease payments, net of estimated sublease as of January 28, 2012, are presented in the following table (in thousands):


Fiscal Year:	Minimum Lease Paymens		Sublease Income			Net Operating Leases
2013	$	68,333	$	(296	)	$	68,037
2014		27,691		(143	)		27,548
2015		21,896		—			21,896
2016		10,369		—			10,369
2017		6,318		—			6,318
Thereafter		4,382		—			4,382

Total future minimum lease payments	$	138,989	$	(439	)	$	138,550

Rent expense, net of sublease income for fiscal 2012, 2011 and 2010 was approximately $20.5 million, $17.1 million and $18.5 million, respectively.

Purchase Commitments

Under the Company’s manufacturing relationships with its foundry partners, cancellation of all outstanding purchase orders are allowed but require payment of all costs and expenses incurred through the date of cancellation. As of January 28, 2012, these foundries had incurred approximately $226.6 million of manufacturing costs and expenses relating to the Company’s outstanding purchase orders.

Intellectual Property Indemnification

The Company has agreed to indemnify certain customers for claims made against the Company’s products, where such claims allege infringement of third party intellectual property rights, including, but not limited to, patents, registered trademarks, and/or copyrights. Under the aforementioned indemnification clauses, the Company may be obligated to defend the customer and pay for the damages awarded against the customer under an infringement claim as well as the customer’s attorneys’ fees and costs. The Company’s indemnification obligations generally do not expire after termination or expiration of the agreement containing the indemnification obligation. In certain cases, there are limits on and exceptions to the Company’s potential liability for indemnification. Although historically the Company has not made significant payments under these indemnification obligations, the Company cannot estimate the amount of potential future payments, if any, that it might be required to make as a result of these agreements. The maximum potential amount of any future payments that the Company could be required to make under these indemnification obligations could be significant.

Contingencies

IPO Securities Litigation. In 2001, two putative class action lawsuits were filed in the United States District Court for the Southern District of New York concerning certain alleged underwriting practices related to the Company’s initial public offering (the “IPO”) on June 29, 2000. The actions were consolidated and a consolidated complaint was filed, naming as defendants certain investment banks that participated in the IPO, the Company, and two of its officers, one of whom is also a director. Plaintiffs claimed that defendants violated certain provisions of the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended (the “Exchange Act”), by allegedly failing to disclose that the underwriters received “excessive” and undisclosed commissions and entered into unlawful “tie-in” agreements with certain of their clients. The consolidated complaint sought unspecified damages, interest and fees. In addition, this case was coordinated with hundreds of other lawsuits filed by plaintiffs against underwriters and issuers for approximately 300 other IPOs. Defendants in the coordinated proceedings moved to dismiss the actions. In February 2003, the trial court granted the motions in part and denied them in part, allowing certain claims to proceed.

The parties reached a global settlement of the coordinated litigation. Under the settlement, the insurers pay the full amount of settlement share allocated to the Company, and the Company bears no financial liability. The Company and other defendants received complete dismissals from the case. In 2009, the district court issued an order of final approval of the settlement. Certain objectors filed appeals, but those appeals all have been dismissed or withdrawn.

Section 16(b) Litigation. On October 9, 2007, a purported shareholder of the Company filed a complaint for violation of Section 16(b) of the Exchange Act, which prohibits short swing trading, against the Company’s IPO underwriters. The complaint Vanessa Simmonds v. The Goldman Sachs Group, et al., Case No. C07-1632 filed in District Court for the Western District of Washington, seeks the recovery of short swing profits. The Company is named as a nominal defendant only, and no recovery is sought from the Company. In March 2009, the district court granted a motion to dismiss filed by the underwriter defendants, which caused the case against the Company to be dismissed. The plaintiff appealed to the U.S. Court of Appeals for the Ninth Circuit, and in December 2010, the Ninth Circuit reversed the dismissal and remanded to the district court. On January 25, 2011, the Ninth Circuit entered an order staying the mandate pending the filing of petitions for writ of certiorari in the United States Supreme Court by the underwriter defendants. No discovery has taken place. Both sides have filed petitions for writ of certiorari to the United States Supreme Court. The Supreme Court denied plaintiff’s writ, but granted the underwriters’ writ, which argued that the case should have been dismissed on statute of limitations grounds. A decision is expected during the on-going term of the court, which ends in June 2012. If the Supreme Court reverses the Ninth Circuit, the case will be concluded. If the Supreme Court affirms the Ninth Circuit, the case will be remanded to the District Court for further proceedings. The Company is currently unable to estimate a possible loss or range of loss, if any.

Jasmine Networks Litigation. On September 12, 2001, Jasmine Networks, Inc. (“Jasmine”) filed a lawsuit in the Santa Clara County Superior Court alleging claims against Marvell Semiconductor, Inc. (“MSI”) and three of its officers for allegedly improperly obtaining and using information and technologies during the course of the negotiations with its personnel regarding the potential acquisition of certain Jasmine assets by MSI.

The case proceeded to trial on September 20, 2010. On November 24, 2010, a Santa Clara County jury returned a verdict in favor of MSI on all claims. On January 7, 2011, the court entered judgment in MSI’s favor. Pursuant to California Civil Procedure provisions, Jasmine filed motions for a new trial and for a judgment notwithstanding the verdict. These motions were heard by the court on February 25, 2011 and denied in written orders. Jasmine has appealed and MSI is contesting the appeal vigorously. The Company is currently unable to estimate a possible loss or range of loss, if any.

Wage and Hour Class Action. On October 18, 2006, Dan Holton (“Holton”), a former employee of MSI, filed a civil complaint in Santa Clara County Superior Court. Holton alleges that MSI misclassified him as an exempt employee. Holton claims that due to its misclassification MSI owes him unpaid wages for overtime, penalties for missed meal periods, and various other penalties under the California Labor Code, as well as interest. Holton also pursues a cause of action for unfair business practices under the California Business & Profession Code. Holton brought his complaint as a class action. On July 8, 2009, the court granted certification of the following class: “All Individual Contributor Engineers who held the title of PCB Designer, Associate Engineer, Engineer, Staff Engineer and Senior Engineers, who at any time during the class period while holding these positions did not have a degree above a baccalaureate degree nor a degree above a baccalaureate degree in a field of science related to the work performed, and worked for MSI in California, at any time from October 19, 2002 through the present.” MSI disputed all plaintiff’s class claims. On November 23, 2011, the parties executed a settlement agreement and plaintiffs filed their motion for preliminary approval of the settlement. The settlement was approved by the Court on March 16, 2012, and will become effective after two additional settlement class members are notified and have an opportunity to object to the approval. The settlement amount has been recorded in the Company’s financial statements for fiscal 2012 and is not significant to the results of operations for fiscal 2012.

Carnegie Mellon Litigation. On March 6, 2009, Carnegie Mellon University (“CMU”) filed a complaint in the United States District Court for the Western District of Pennsylvania naming MSI and the Company as defendants and alleging patent infringement. CMU has asserted two patents (U.S. Patent Nos. 6,201,839 and 6,438,180) purportedly relating to read-channel integrated circuit devices and the HDD products incorporating such devices. The complaint seeks unspecified damages and an injunction. On June 1, 2009, MSI and the Company filed their answers and MSI filed counterclaims to the complaint seeking declaratory judgments of non-infringement and invalidity as to both of the asserted patents. The claim construction hearing was held on April 12 and 13, 2010, and a ruling was issued on October 1, 2010. On April 29, 2010, MSI and the Company filed their amended answers and counterclaims. The Company and MSI filed a motion for partial summary judgment of invalidity on December 22, 2010, which was denied on September 28, 2011. MSI and the Company filed a second motion for partial summary judgment of invalidity on November 2, 2011, which was heard on December 6, 2011. Trial is set for November 26, 2012. MSI and the Company believe that they do not infringe any valid and enforceable claims of the asserted CMU patents in suit and intend to litigate this action vigorously. The Company is currently unable to estimate a possible loss or range of loss, if any.

USEI Litigation. On October 9, 2009, U.S. Ethernet Innovations, LLC (“USEI”) filed a complaint in the Eastern District of Texas, in which USEI has accused a number of system manufacturers, including the Company’s customers, of patent infringement (the “USEI litigation”). Specifically, USEI has asserted that these customers infringe U.S. Patent Nos. 5,307,459, 5,434,872, 5,732,094 and 5,299,313 (collectively, the “USEI patents in suit”), which purportedly relate to Ethernet technologies. The complaint seeks unspecified damages and an injunction.

On May 4, 2010, MSI filed a motion to intervene in the USEI litigation, which was granted on May 19, 2010. On July 13, 2010, the court issued an order granting the Defendants’ motion to transfer the action to the Northern District of California; the case was formally transferred on August 23, 2010. On October 21, 2011, the court conducted a claim construction hearing, and a ruling was issued on January 31, 2012. The court has not yet set dates for trial. MSI believes that it does not infringe any valid and enforceable claim of the USEI patents in suit, and intends to litigate this action vigorously. The Company is currently unable to estimate a possible loss or range of loss, if any.

Lake Cherokee Patent Litigation. On June 30, 2010, Lake Cherokee Hard Drive Technologies, L.L.C. filed a complaint in the United States District Court in the Eastern District of Texas. The complaint names MSI and seven other defendants, and alleges infringement of U.S. Patent Nos. 5,844,738 and 5,978,162 (collectively, the “Lake Cherokee patents in suit”). The Lake Cherokee patents in suit purportedly relate to read-channel integrated circuit devices, and allegedly, to certain unspecified HDD products incorporating such devices. The complaint seeks unspecified damages and a permanent injunction. MSI filed its answer and counterclaims to the complaint on September 13, 2010. Defendants filed a motion to transfer on April 1, 2011, which was denied on February 13, 2012. Lake Cherokee filed an amended complaint on April 21, 2011. MSI filed its answer and counterclaims to the amended complaint on May 9, 2011. A Markman hearing is scheduled for May 23, 2012, and trial is set for August 5, 2013. MSI believes that it does not infringe any valid and enforceable claim of the Lake Cherokee patents in suit, and intends to litigate this action vigorously. The Company is currently unable to estimate a possible loss or range of loss, if any.

APT Patent Litigation. On January 18, 2011, Advanced Processor Technologies, LLC, a subsidiary of Acacia Research Corp., filed a complaint in the United States District Court in the Eastern District of Texas. The complaint names MSI and eight other defendants and alleges infringement of U.S. Patent Nos. 6,047,359 (“’359 patent”) and 5,796,978 (“’978 patent”). The asserted patents purportedly relate to microprocessor technologies. The complaint seeks unspecified damages and a permanent injunction. A first amended complaint was filed on January 26, 2011. The first amended complaint continues to assert the ‘359 patent against MSI, but appears to no longer assert the ‘978 patent against MSI. MSI filed its answer and counterclaims on April 15, 2011. A claim construction hearing is scheduled for January 29, 2013, and jury selection is set for July 1, 2013. MSI believes that it does not infringe any valid and enforceable claim of the APT patents in suit, and intends to litigate this action vigorously. The Company is currently unable to estimate a possible loss or range of loss, if any.

LAMD Patent Litigations. On October 11, 2010, Marvell International Ltd. (“MIL”) filed a complaint against Link-A-Media Devices Corporation (“LAMD”) in the United States District Court for the District of Delaware. The complaint asserts that LAMD infringes its U.S. Patent Nos. 7,328,395, 7,751,138, 7,099,411 and 7,228,485. On June 30, 2011, MIL filed a motion to amend its complaint to add U.S. Patent Nos. 6,903,448 and 7,528,013.

On February 10, 2011, LAMD filed a complaint against MSI in the United States District Court for the Northern District of California. The complaint asserts that MSI infringes LAMD’s U.S. Patent No. 7,590,927.

On November 21, 2011, MIL and MSI obtained a favorable settlement with LAMD relating to the Delaware and California cases, and both cases were subsequently dismissed.

MOSAID Litigation. On March 16, 2011, MOSAID Technologies Inc. filed suit in the United States District for the Eastern District of Texas against MSI and 16 other companies. The complaint alleges that defendants’ products, which operate in compliance with the IEEE 802.11a, 802.11b, 802.11g, and 802.11n standards, infringe the six asserted patents (U.S. Patent Nos. 5,131,006; 5,151,920; 5,422,887; 5,706,428; 6,563,768; 6,992,972). MSI filed its answer and counterclaims on June 9, 2011. A claim construction hearing is scheduled for February 18, 2014, and jury selection is set for August 4, 2014. MSI believes that it does not infringe any valid and enforceable claim of the MOSAID patents in suit, and intends to litigate this action vigorously. The Company is currently unable to estimate a possible loss or range of loss, if any.

Azure Networks Litigation. On March 22, 2011, Azure Networks LLC and Tri-County Excelsior Foundation filed suit in the Eastern District of Texas against MSI and eight other companies. The suit alleges that MSI’s Bluetooth products infringe its U.S. Patent No. 7,756,129. MSI filed its answer and counterclaims on July 20, 2011. A claim construction hearing is scheduled for November 29, 2012, and trial is set for November 12, 2013. MSI believes that it does not infringe any valid and enforceable claim of the Azure Networks patents in suit, and intends to litigate this action vigorously. The Company is currently unable to estimate a possible loss or range of loss, if any.

Power Management Systems Litigation. On August 22, 2011, Power Management Systems LLC, a subsidiary of Acacia Research Corp., filed a complaint against MSI and three other defendants, in the federal district court for the District of Delaware. The complaint asserts U.S. Patent No. 5,504,909, which purportedly relates to a power management apparatus, against various products. The complaint seeks unspecified damages. A claim construction hearing is scheduled for September 27, 2012 and trial is set for November 25, 2013. MSI believes that it does not infringe any valid and enforceable claim of the Power Management patents in suit, and intends to litigate this action vigorously. The Company is currently unable to estimate a possible loss or range of loss, if any.

HSM/TPL Litigation. On September 1, 2011, HSM Portfolio, LLC and Technology Properties Limited, LLC filed a complaint against the Company and its subsidiary, Marvell Semiconductor, Ltd. (“MSL”), in the federal district court for the District of Delaware. The complaint also named numerous other defendants. The complaint asserts U.S. Patent No. 5,030,853, purportedly relating to high speed logic and memory circuitry, against various products. The complaint seeks unspecified damages. On January 9, 2012, HSM/TPL filed an amended complaint adding MSI to the case. On February 15, 2012, the Company and MSL were dismissed from the case. MSI believes that it does not infringe any valid and enforceable claim of the HSM/TPL patents in suit, and intends to litigate this action vigorously intend to vigorously defend this action. The Company is currently unable to estimate a possible loss or range of loss, if any.

General. The Company is also party to various other legal proceedings and claims arising in the normal course of business. The legal proceedings and claims described above could result in substantial costs and could divert the attention and resources of the Company’s management. Although the legal responsibility and financial impact with respect to each of these proceedings and claims cannot currently be ascertained, an unfavorable outcome in any of such actions could have a material adverse effect on the Company’s cash flows. As to each of the ongoing legal matters mentioned above, the Company is currently unable to estimate a possible loss or range of loss, if any. Litigation is subject to inherent uncertainties and unfavorable rulings could occur. An unfavorable ruling in litigation could require the Company to pay damages or one-time license fees or royalty payments and could prevent the Company from manufacturing or selling some of its products or limit or restrict the type of work that employees involved in such litigation may perform for the Company, any of which could adversely affect financial results in future periods. The Company believes that it competes lawfully and that its marketing, business and intellectual property benefit is customers and shareholders, and it will continue to conduct a vigorous defense in these proceedings. There can be no assurance that these matters will be resolved in a manner that is not adverse to the Company’s business, financial condition, results of operations or cash flows.

Indemnities, Commitments and Guarantees

During its normal course of business, the Company has made certain indemnities, commitments and guarantees under which it may be required to make payments in relation to certain transactions. These indemnities include intellectual property indemnities to the Company’s customers in connection with the sales of its products, indemnities for liabilities associated with the infringement of other parties’ technology based upon the Company’s products, indemnities to various lessors in connection with facility leases for certain claims arising from such facility or lease, and indemnities to directors and officers of the Company to the maximum extent permitted under the laws of Bermuda. In addition, the Company has contractual commitments to various customers, which could require the Company to incur costs to repair an epidemic defect with respect to its products outside of the normal warranty period if such defect were to occur. The duration of these indemnities, commitments and guarantees varies, and in certain cases, is indefinite. The majority of these indemnities, commitments and guarantees do not provide for any limitation of the maximum potential future payments that the Company could be obligated to make. The Company has not recorded any liability for these indemnities, commitments and guarantees in the accompanying Consolidated Balance Sheets. The Company does, however, accrue for losses for any known contingent liability, including those that may arise from indemnification provisions, when future payment is probable.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Segment and Geographic Information:

12 Months Ended

Jan. 28, 2012

Segment and Geographic Information:

Note 13 — Segment and Geographic Information:

The Company operates in one reportable segment — the design, development and sale of integrated circuits. The chief executive officer has been identified as the chief operating decision maker (“CODM”). The Company’s CODM is ultimately responsible and actively involved in the allocation of resources and the assessment of the Company’s operational and financial performance. The fact that the Company operates in only one reportable segment is based on the following:

•

The Company uses a highly integrated approach in developing its products in that discrete technologies developed by the Company are frequently integrated across many of its products. Substantially all of the Company’s integrated circuits are manufactured under similar manufacturing processes.

•

The Company’s organizational structure is based along functional lines. Each of the functional department heads reports directly to the CODM. Shared resources in the Company also report directly to the CODM or to a direct report of the CODM.

•

The assessments of performance across the Company, including assessment of the Company’s incentive compensation plan, are based largely on operational performance and consolidated financial performance.

•

The decisions on allocation of resources and other operational decisions are made by the CODM based on his hands-on involvement with the Company’s operations and product development.

The following tables present net revenue and long-lived asset information based on geographic region. Net revenue is based on the destination of the shipments and long-lived assets are based on the physical location of the assets (in thousands):


	Year Ended
Net Revenue:	January 28, 2012		January 29, 2011		January 30, 2010
United States	$	194,638	$	157,259	$	127,399
China		1,496,864		1,209,982		721,445
Thailand		531,073		602,639		484,862
Malaysia		420,382		348,271		301,504
Japan		60,404		99,173		192,126
Others		689,679		1,194,569		980,351

	$	3,393,040	$	3,611,893	$	2,807,687


Property and equipment, net:	January 28, 2012		January 29, 2011
Bermuda	$	8,256	$	9,797
China		32,205		27,361
Israel		26,061		18,389
Singapore		92,563		85,881
United States		207,848		202,049
Others		16,868		14,963

	$	383,801	$	358,440

The following table presents net revenue by end market (in thousands):


	Year Ended
Net Revenue by End Market	January 28, 2012		January 29, 2011		January 30, 2010
Storage products	$	1,560,772	$	1,650,465	$	1,574,370
Mobile and Wireless		968,706		1,124,442		531,518
Networking		697,865		683,103		596,561
Other		165,697		153,883		105,238

	$	3,393,040	$	3,611,893	$	2,807,687

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

+ Details

Related Party Transactions:

12 Months Ended

Jan. 28, 2012

Related Party Transactions:

Note 14 — Related Party Transactions:

MIL is party to a technology license agreement with VeriSilicon Holdings Co., Ltd. (“VeriSilicon”). MIL assumed this technology license agreement between VeriSilicon and UTStarco m, Inc. after the Company’s acquisition of the semiconductor business of UTStarcom in December 2005. MIL has subsequently entered into various addenda to this agreement for additional technology beyond the scope of the original agreement. During fiscal 2012, MIL entered into three new addenda with VeriSilicon related to the technology license agreement. In addition, in September 2010, MIL entered into a services agreement with VeriSilicon, pursuant to which VeriSilicon has agreed to provide design support services to MIL. Under the service agreement, VeriSilicon helped on two projects for MIL during fiscal 2012. In connection with all of its transactions, MIL paid $1.2 million and $2.6 million to VeriSilicon during fiscal 2012 and fiscal 2011, respectively. As of January 28, 2012, the Company had $1.0 million of liability to VeriSilicon. Weili Dai’s brother (and Dr. Sehat Sutardja’s brother-in-law) is the Chairman, President and Chief Executive Officer of VeriSilicon. Ms. Dai is also a shareholder of VeriSilicon. Ms. Dai is a greater than ten percent shareholder of the Company and Dr. Sehat Sutardja is the Company’s President and Chief Executive Officer. Dr. Sehat Sutardja and Ms. Dai are husband and wife.

In December 2009, MIL entered into a technology license agreement with Vivante Corporation (“Vivante”) that provides for the license of graphics technology and associated services. This agreement restates, expands and succeeds previous agreements between the parties for the same technology. The total amount of the license fee was $12.0 million (paid over three years) and ten percent for support fees (paid over three years). In August 2011, MIL entered into an amendment to the technology license agreement to include other technology that included additional license fees. In connection with all of its transactions, MIL paid $5.8 million and $5.7 million to Vivante during fiscal 2012 and fiscal 2011, respectively. As of January 28, 2012, the Company had $5.8 million of liability to Vivante. Dr. Sehat Sutardja and Ms. Dai, through their ownership and control of Estopia LLC, are indirect shareholders of Vivante. In addition, Dr. Sehat Sutardja is also a direct shareholder and Chairman of the board of directors of Vivante. Ms. Dai’s brother (and Dr. Sehat Sutardja’s brother-in-law) is the Chief Executive Officer of Vivante.

- Definition

The entire disclosure for related party transactions, including the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, and amounts due to or from related parties. If the entity and one or more other entities are under common ownership or management control and this control affects the operating results or financial position, disclosure includes the nature of the control relationship even if there are no transactions between the entities. Disclosure may also include the aggregate amount of current and deferred tax expense for each statement of earnings presented where the entity is a member of a group that files a consolidated tax return, the amount of any tax related balances due to or from affiliates as of the date of each statement of financial position presented, the principal provisions of the method by which the consolidated amount of current and deferred tax expense is allocated to the members of the group and the nature and effect of any changes in that method. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph k

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 3A
-Section 04
-Paragraph b

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 57
-Paragraph 1-4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
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-Paragraph 1
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 850
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-Paragraph 3
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 850
-SubTopic 10
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-Paragraph 5
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+ Details

Supplementary Data (Unaudited)

12 Months Ended

Jan. 28, 2012

Supplementary Data (Unaudited)

Supplementary Data (Unaudited)

The following table presents the unaudited consolidated statements of operations data for each of the eight quarters in the period ended January 28, 2012. In management’s opinion, this information has been presented on the same basis as the audited consolidated financial statements included in a separate section of this Annual Report on Form 10-K, and all necessary adjustments, consisting only of normal recurring adjustments, have been included in the amounts below to fairly state the unaudited quarterly results when read in conjunction with the audited consolidated financial statements and related notes. The operating results for any period should not be considered indicative of results to be expected in any future period. The Company expects the quarterly operating results to fluctuate in future periods due to a variety of reasons, including those discussed in Part I, Item 1A “Risk Factors.”


	Fiscal 2012
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(In thousands, except per share amounts)
Net revenue	$	802,402	$	897,520	$	950,417	$	742,701
Gross profit	$	467,927	$	519,403	$	538,317	$	401,588
Net income	$	146,861	$	192,392	$	195,121	$	80,717
Net income per share:
Basic	$	0.23	$	0.32	$	0.32	$	0.14
Diluted	$	0.22	$	0.31	$	0.32	$	0.13

	Fiscal 2011
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(In thousands, except per share amounts)
Net revenue	$	855,579	$	896,474	$	959,327	$	900,513
Gross profit	$	511,594	$	529,792	$	568,519	$	528,714
Net income	$	205,767	$	219,777	$	255,732	$	222,853
Net income per share:
Basic	$	0.32	$	0.34	$	0.39	$	0.34
Diluted	$	0.30	$	0.33	$	0.38	$	0.33

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Jan. 28, 2012

VALUATION AND QUALIFYING ACCOUNTS

Schedule II

VALUATION AND QUALIFYING ACCOUNTS


	Balance at Beginning of Year		Additions		Deductions			Balance at End of Year
	(in thousands)
Fiscal year ended January 28, 2012
Allowance for doubtful accounts and sales return reserve	$	7,366	$	4,393	$	(9,096	)	$	2,663

Deferred tax valuation	$	224,853	$	34,694	$	(231	)	$	259,316


Fiscal year ended January 29, 2011
Allowance for doubtful accounts and sales return reserve	$	5,912	$	12,217	$	(10,763	)	$	7,366

Deferred tax valuation	$	197,710	$	30,621	$	(3,478	)	$	224,853


Fiscal year ended January 30, 2010
Allowance for doubtful accounts and sales return reserve	$	3,206	$	6,714	$	(4,008	)	$	5,912

Deferred tax valuation	$	134,576	$	77,353	$	(14,219	)	$	197,710

The Company and its Significant Accounting Policies: (Policies)

12 Months Ended

Jan. 28, 2012

The Company

The Company

Basis of Presentation

Basis of Presentation

Certain reclassifications have been made to prior period balances in order to conform to the current period’s presentation.

Use of Estimates

Use of Estimates

Principles of Consolidation

Principles of Consolidation

Cash and Cash Equivalents

Cash and Cash Equivalents

Restricted Cash

Restricted Cash

Investments

Investments

Impairment of Investments

Impairment of Investments

Derivative Financial Instruments

Derivative Financial Instruments

Concentration of Credit Risk and Significant Customers

Concentration of Credit Risk and Significant Customers

The following table sets forth sales to end customers comprising 10% or more of the Company’s net revenue for the periods indicated:


	Year Ended
Customer	January 28, 2012			January 29, 2011			January 30, 2010
Western Digital		19	%		21	%		24	%
Research in Motion		*			14	%		*
Toshiba		*			*			15	%

*	Less than 10% of net revenue

Inventories

Inventories

Property and Equipment

Property and Equipment

Goodwill

Goodwill

Long-Lived Assets and Intangible Assets

Long-Lived Assets and Intangible Assets

Foreign Currency Transactions

Foreign Currency Transactions

Revenue Recognition

Revenue Recognition

The Company recognizes revenues when there is persuasive evidence of an arrangement, delivery has occurred, the fee is fixed or determinable, and collection is reasonably assured.

Advertising Expense

Advertising Expense

Advertising costs are expensed as incurred.

Stock-Based Compensation

Stock-Based Compensation

Comprehensive Income

Comprehensive Income

Accounting for Income Taxes

Accounting for Income Taxes

Warranty

Warranty

Recent Accounting Pronouncements

Recent Accounting Pronouncements

The Company and its Significant Accounting Policies: (Tables)

12 Months Ended

Jan. 28, 2012

Schedules of Concentration of Risk, by Risk Factor

The following table sets forth sales to end customers comprising 10% or more of the Company’s net revenue for the periods indicated:


	Year Ended
Customer	January 28, 2012			January 29, 2011			January 30, 2010
Western Digital		19	%		21	%		24	%
Research in Motion		*			14	%		*
Toshiba		*			*			15	%

*	Less than 10% of net revenue

- Definition

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

+ References + Details

Business Combinations: (Tables)

12 Months Ended

Jan. 28, 2012

Schedule of Purchase Price Allocation

The purchase price of Xelerated was allocated as follows:


	(In thousands)
Accounts receivable	$	2,407
Inventory		6,481
Prepaid and other current assets		111
Property, plant and equipment		441

Tangible assets acquired		9,440
Goodwill		22,324
Intangible assets		51,800

Total assets acquired		83,564
Accounts payable		(256	)
Accrued liabilities		(7,152	)
Deferred tax liability		(1,000	)

Net assets acquired	$	75,156

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination

The acquired intangible assets from Xelerated were recognized as follows based upon their fair value as of the acquisition date.


	Fair value (In thousands)		Estimated useful lives (in years)
Intangible assets:
Purchased technology	$	25,800		6
Customer intangible		24,700		5
Trade name		1,300		5

Total	$	51,800

Investments: (Tables)

12 Months Ended

Jan. 28, 2012

Schedule of Available-for-sale Securities Reconciliation

The following tables summarize the Company’s investments (in thousands):


	As of January 28, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	685,563	$	3,081	$	(799	)	$	687,845
Foreign government		2,033		3		—			2,036
U.S. federal and state debt securities		770,298		1,437		(20	)	$	771,715

Total short-term investments	$	1,457,894	$	4,521	$	(819	)	$	1,461,596
Long-term investments:
Available-for-sale:
Auction rate securities	$	24,500	$	—	$	(1,285	)	$	23,215

Total long-term investments	$	24,500	$	—	$	(1,285	)	$	23,215

Total investments	$	1,482,394	$	4,521	$	(2,104	)	$	1,484,811


	As of January 29, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	648,278	$	3,208	$	(213	)	$	651,273
U.S. federal and state debt securities		431,174		561		(52	)		431,683

Total short-term investments	$	1,079,452	$	3,769	$	(265	)	$	1,082,956
Long-term investments:
Available-for-sale:
Auction rate securities	$	27,850	$	—	$	(1,624	)	$	26,226

Total long-term investments	$	27,850	$	—	$	(1,624	)	$	26,226

Total investments	$	1,107,302	$	3,769	$	(1,889	)	$	1,109,182

Investments Classified by Contractual Maturity Date

The contractual maturities of available-for-sale securities at January 28, 2012 and January 29, 2011 are presented in the following table (in thousands):


	January 28, 2012				January 29, 2011
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	641,433	$	642,317	$	560,190	$	560,999
Due between one and five years		816,461		819,279		519,262		521,957
Due over five years		24,500		23,215		27,850		26,226

	$	1,482,394	$	1,484,811	$	1,107,302	$	1,109,182

Unrealized Loss Position Investments


	January 28, 2012
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	146,963	$	(799	)	$	—	$	—		$	146,963	$	(799	)
U.S. federal and state debt securities		107,603		(20	)		—		—			107,603		(20	)
Auction rate securities		—		—			23,215		(1,285	)		23,215		(1,285	)

Total securities	$	254,566	$	(819	)	$	23,215	$	(1,285	)	$	277,781	$	(2,104	)


	January 29, 2011
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	113,081	$	(213	)	$	—	$	—		$	113,081	$	(213	)
U.S. Federal and State debt securities		91,962		(52	)		—		—			91,962		(52	)
Auction rate securities		—		—			26,226		(1,624	)		26,226		(1,624	)

Total securities	$	205,043	$	(265	)	$	26,226	$	(1,624	)	$	231,269	$	(1,889	)

Supplemental Financial Information (in thousands): (Tables)

12 Months Ended

Jan. 28, 2012

Schedule of Cash and Cash Equivalents

Cash and cash equivalents


	January 28, 2012		January 29, 2011
Cash	$	503,095	$	340,236
Cash equivalents:
Commercial paper		12,500		9,797
Time deposits		205,060		159,938
Money market mutual fund		64,247		1,230,616
Federal agency notes		—		106,487

Total cash and cash equivalents	$	784,902	$	1,847,074

Schedule of Inventory, Current

Inventories


	January 28, 2012		January 29, 2011
Work-in-process	$	190,779	$	156,108
Finished goods		163,340		89,340

Inventories	$	354,119	$	245,448

Property, Plant and Equipment

Property and equipment, net


	January 28, 2012			January 29, 2011
Machinery and equipment	$	489,481		$	435,900
Buildings		144,596			144,596
Computer software		81,852			74,966
Land		69,246			69,246
Building improvements		42,083			41,200
Leasehold improvements		37,237			34,142
Furniture and fixtures		24,450			23,498
Construction in progress		9,846			8,469

		898,791			832,017
Less: Accumulated depreciation and amortization		(514,990	)		(473,577	)

Property and equipment, net	$	383,801		$	358,440

Schedule of Other Assets, Noncurrent

Other non-current assets


	January 28, 2012		January 29, 2011
Technology and other licenses	$	50,212	$	51,642
Deferred tax assets		31,064		27,671
Deferred compensation		5,419		6,169
Prepayments for foundry capacity		759		5,289
Severance fund		1,734		4,819
Investments in privately held companies		6,309		3,950
Other		12,649		11,840

Other non-current assets	$	108,146	$	111,380

Schedule of Accrued Liabilities

Accrued liabilities


	January 28, 2012		January 29, 2011
Accrued rebates	$	24,420	$	32,405
Accrued royalties		16,896		14,018
Accrued legal expense		13,999		8,551
Accrued fees for tax, audit and other professional services		1,553		2,125
Customer advances for NRE services		4,170		3,515
Technology license obligations		5,250		4,850
Accrued sales/goods and services tax		1,218		3,679
Other		20,149		16,851

Accrued liabilities	$	87,655	$	85,994

Other Noncurrent Liabilities

Other long-term liabilities


	January 28, 2012		January 29, 2011
Technology license obligations	$	11,255	$	19,218
Long-term accrued employee compensation		10,059		9,258
Long-term facilities consolidation		2,136		3,271
Accrued severance		1,983		3,226
Other		7,035		4,367

Other long-term liabilities	$	32,468	$	39,340

Schedule of Calculation of Numerator and Denominator in Earnings Per Share

The computations of basic and diluted net income per share are presented in the following table (in thousands, except per share amounts):


	Year Ended
	January 28, 2012		January 29, 2011		January 30, 2010
Numerator:
Net income:	$	615,091	$	904,129	$	353,456

Denominator:
Weighted average common shares outstanding:
Weighted average shares — basic		607,857		648,347		623,934
Effect of dilutive securities:
Common share options and other		15,411		28,531		29,807

Weighted average shares — diluted		623,268		676,878		653,741

Net income per share:
Basic	$	1.01	$	1.39	$	0.57
Diluted	$	0.99	$	1.34	$	0.54

Schedule of Comprehensive Income (Loss)

The changes in the components of other comprehensive income were as follows (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Net income	$	615,091		$	904,129		$	353,456
Other comprehensive income
Net unrealized gain on marketable securities		198			2,417			1,087
Net unrealized gain (loss) on auction rate securities		339			695			(1,010	)
Net unrealized gain (loss) on cash flow hedges		(848	)		(1,134	)		341
Other		(5	)		(1	)		(585	)

Total comprehensive income	$	614,775		$	906,106		$	353,289

Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income were as follows (in thousands):


	January 28, 2012			January 29, 2011
Unrealized gain on marketable securities	$	3,702		$	3,504
Unrealized loss on auction rate securities		(1,285	)		(1,624	)
Unrealized loss on cash flow hedges		(1,641	)		(793	)
Other		—			5

Accumulated other comprehensive income	$	776		$	1,092

Derivative Financial Instruments: (Tables)

12 Months Ended

Jan. 28, 2012

Schedule of Derivative Instruments

As of January 28, 2012, the notional amounts of outstanding forward contracts were as follows (in thousands):


	January 28, 2012				January 29, 2011
	Buy Contracts		Sell Contracts		Buy Contracts		Sell Contracts
Israeli shekel	$	42,637	$	—	$	56,360	$	—
Euro		—		—		—		3,698

	$	42,637	$	—	$	56,360	$	3,698

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41678-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

+ Details

Fair Value Measurements: (Tables)

12 Months Ended

Jan. 28, 2012

Fair Value, Assets Measured on Recurring Basis


	Level 1		Level 2		Level 3		Portion of Carrying Value Measured at Fair Value at January 28, 2012
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	64,247	$	—	$	—	$	64,247
Corporate debt securities		—		12,500		—		12,500
Time deposit		—		205,060		—		205,060
Short-term investments:
U.S. federal and state debt securities		771,715		—		—		771,715
Corporate debt securities		—		687,845		—		687,845
Foreign government		—		2,036		—		2,036
Long-term investments:
Auction rate securities		—		—		23,215		23,215
Other non-current assets:
Severance pay fund		—		1,734		—		1,734

Total assets	$	835,962	$	909,175	$	23,215	$	1,768,352

Liabilities
Accrued liabilities:

Forward contracts	$	—	$	1,520	$	—	$	1,520


	Level 1		Level 2		Level 3		Portion of Carrying Value Measured at Fair Value at January 29, 2011
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	1,230,616	$	—	$	—	$	1,230,616
US government and agencies		106,487		—		—		106,487
Corporate debt securities		—		9,797		—		9,797
Time deposit		—		159,938		—		159,938
Short-term investments:
US government and agencies		431,683		—		—		431,683
Corporate debt securities		—		651,273		—		651,273
Long-term investments:
Auction rate securities		—		—		26,226		26,226
Prepaid expense and other current assets:
Forward contracts		—		166		—		166
Other non-current assets:
Severance pay fund		2,425		2,394		—		4,819

Total assets	$	1,771,211	$	823,568	$	26,226	$	2,621,005

Liabilities
Accrued liabilities:

Forward contracts	$	—	$	804	$	—	$	804

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following table summarizes the change in fair values for Level 3 items for the year ended January 28, 2012:


	Level 3
Changes in fair value during the year (pre-tax):
Beginning balance at January 31, 2010	$	39,281
Purchases		—
Sales, redemption and settlement		(13,616	)
Realized loss on sale		(134	)
Unrealized gain included in accumulated other comprehensive income		695

Beginning balance at January 30, 2011	$	26,226
Purchases		—
Sales, redemption and settlement		(3,350	)
Realized loss on sale		—
Unrealized gain included in accumulated other comprehensive income		339

Ending balance at January 28, 2012	$	23,215

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References + Details

Goodwill and Acquired Intangible Assets: (Tables)

12 Months Ended

Jan. 28, 2012

Schedule of Goodwill

The following table summarizes the activity related to the carrying value of goodwill (in thousands):


Balance at January 30, 2010	$	1,997,662
Additions due to business combinations		7,171

Balance at January 29, 2011	$	2,004,833
Additions due to business combinations		27,158

Balance at January 28, 2012	$	2,031,991

Schedule of Finite-Lived Intangible Assets by Major Class

The carrying amounts of acquired intangible assets are as follows (in thousands):


		January 28, 2012							January 29, 2011
	Range of Useful Lives	Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amount		Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amount
Purchased technology	1 - 7 years	$	103,490	$	(50,906	)	$	52,584	$	64,125	$	(36,962	)	$	27,163
Core technology	1 - 8 years		178,000		(142,932	)		35,068		178,800		(121,509	)		57,291
Trade name	1 - 5 years		1,500		(232	)		1,268		200		(149	)		51
Customer intangible	4 - 7 years		89,900		(47,856	)		42,044		118,600		(88,174	)		30,426
IPR&D	*		10,541		—			10,541		9,700		—			9,700

Total intangible assets, net		$	383,431	$	(241,926	)	$	141,505	$	371,425	$	(246,794	)	$	124,631

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense


Fiscal year
2013	$	50,927
2014		36,254
2015		14,852
2016		12,088
2017		10,896
Thereafter		5,947

	$	130,964

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Restructuring: (Tables)

12 Months Ended

Jan. 28, 2012

Schedule of Restructuring and Related Costs

The following table sets forth an analysis of the components of the restructuring charges and the payments made for the years ended (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Restructuring liabilities, beginning of period	$	3,306		$	5,397		$	7,685
Severance and related charges		—			—			8,640
Facilities and related charges		1,619			3,420			3,884
Equipment and other related charges		237			94			9,139
Non-cash adjustment		(506	)		(1,272	)		(4,882	)
Net cash payments		(1,739	)		(4,002	)		(19,069	)
Adjustments to previous assumptions		—			(331	)		—

Restructuring liabilities, end of period	$	2,917		$	3,306		$	5,397

Schedule of Restructuring Reserve by Type of Cost

The following table presents details of restructuring charges by functional line item (in thousands):


	January 28, 2012		January 29, 2011		January 30, 2010
Research and development	$	728	$	1,966	$	15,046
Selling and marketing		8		—		1,838
General and administrative		1,120		1,217		4,779

	$	1,856	$	3,183	$	21,663

Shareholders' Equity: (Tables)

12 Months Ended

Jan. 28, 2012

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The following table summarizes the activity under the Option Plan, the 2007 Directors’ Plan and other stock based arrangements (in thousands, except for per share amounts):


	Time-Based Options					Market-Based Options					Total
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Balance at January 31, 2009		85,054		$	10.81		—			—		85,054		$	10.81
Granted		1,819		$	13.85		—			—		1,819		$	13.85
Canceled/Forfeited		(3,726	)	$	15.45		—			—		(3,726	)	$	15.45
Expired		—			—		—			—		—			—
Exercised		(12,181	)	$	7.12		—			—		(12,181	)	$	7.12

Balance at January 30, 2010		70,966		$	11.28		—			—		70,966		$	11.28
Granted		2,018		$	20.17		—			—		2,018		$	20.17
Canceled/Forfeited		(2,700	)	$	18.47		—			—		(2,700	)	$	18.47
Expired		—			—		—			—		—			—
Exercised		(13,959	)	$	8.45		—			—		(13,959	)	$	8.45

Balance at January 29, 2011		56,325		$	11.96		—			—		56,325		$	11.96
Granted		3,477		$	15.31		3,149		$	15.43		6,626		$	15.37
Canceled/Forfeited		(1,654	)	$	14.57		(25	)	$	15.43		(1,679	)	$	14.58
Expired		—			—		—			—		—			—
Exercised		(5,681	)	$	7.95		—			—		(5,681	)	$	7.95

Balance at January 28, 2012		52,467		$	12.53		3,124		$	15.43		55,591		$	12.70

Vested or expected to vest at January 28, 2012		51,656		$	12.51		2,698		$	15.43		54,354		$	12.66

Exercisable at January 28, 2012		42,122		$	12.49		—			—		42,122		$	12.49

Schedule of Nonvested Share Activity

Included in the following table is activity related to the non-vested portion of the restricted stock units as follows (in thousands, except for share prices):


	Restricted Stock Outstanding			Weighted Average Grant Date Fair Value
Balance at January 31, 2009		6,499		$	9.58
Granted		78		$	13.49
Vested		(3,376	)	$	10.20
Canceled/Forfeited		(455	)	$	6.50

Balance at January 30, 2010		2,746		$	8.99
Granted		4,718		$	20.76
Vested		(1,619	)	$	9.13
Canceled/Forfeited		(359	)	$	13.87

Balance at January 29, 2011		5,486		$	18.75
Granted		6,877		$	15.80
Vested		(2,014	)	$	15.90
Canceled/Forfeited		(703	)	$	16.81

Balance at January 28, 2012		9,646		$	17.38

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table presents details of stock-based compensation expenses by functional line item (in thousands):


	Year Ended
	January 28, 2012		January 29, 2011		January 30, 2010
Cost of goods sold	$	6,995	$	7,522	$	10,690
Research and development		85,924		82,524		89,766
Selling and marketing		12,920		11,769		15,298
General and administrative		14,024		16,590		10,845

	$	119,863	$	118,405	$	126,599

Time Based Option Award

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Time-based Stock Options


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Estimated fair value	$	6.05		$	9.33		$	6.32
Volatility		44	%		53	%		53	%
Expected term (in years)		4.8			4.7			4.6
Risk-free interest rate		2.0	%		2.2	%		2.1	%
Dividend yield		—			—			—

Market Based Option Award

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Market-based Stock Options


	Year Ended
	January 28, 2012
Estimated fair value	$	5.08
Expected Volatility		42	%
Risk-free interest rate		0.85 - 3.59	%
Dividend yield		—

Employee Stock Purchase Plan

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Employee Stock Purchase Plan


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Estimated fair value	$	4.63		$	5.91		$	4.34
Volatility		44	%		53	%		51	%
Expected term (in years)		1.1			0.5			1.1
Risk-free interest rate		0.1	%		0.2	%		0.6	%
Dividend yield		—			—			—

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References + Details

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Income Taxes: (Tables)

12 Months Ended

Jan. 28, 2012

Schedule Of US and non US Components of Income Before Income Tax Expense (Benefit)

The U.S. and non-U.S. components of income before income taxes consist of the following (in thousands):


	Year Ended
	January 28, 2012		January 29, 2011		January 30, 2010
U.S. operations	$	28,039	$	22,647	$	12,714
Non-U.S. operations		591,020		887,815		330,396

	$	619,059	$	910,462	$	343,110

Schedule of Components of Income Tax Expense (Benefit)

The provision for income taxes consists of the following (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Current income tax expense (benefit):
Federal	$	8,183		$	1,111		$	(35,778	)
State		99			49			576
Foreign		(1,069	)		3,282			11,500

Total current income tax expense		7,213			4,442			(23,702	)

Deferred income tax expense (benefit):
Federal		(1,361	)		7,025			(254	)
State		1,078			3,037			(556	)
Foreign		(2,962	)		(8,171	)		14,166

Total deferred income tax expense (benefit)		(3,245	)		1,891			13,356

Total provision (benefit) for income taxes	$	3,968		$	6,333		$	(10,346	)

Schedule of Deferred Tax Assets and Liabilities

Deferred tax assets consist of the following (in thousands):


	January 28, 2012			January 29, 2011
Deferred tax assets:
Federal and California research and other tax credits	$	259,635		$	225,695
Reserves and accruals		32,328			29,718
Stock compensation		2,678			2,880
Net operating losses		21,813			19,643

Gross deferred tax assets		316,454			277,936
Valuation allowance		(259,316	)		(224,853	)

Total deferred tax assets		57,138			53,083
Total deferred tax liabilities		(15,405	)		(14,595	)

Net deferred tax assets	$	41,733		$	38,488

Reconciliation Of United States Statutory Federal Tax Rate

Reconciliation of the statutory federal income tax to the Company’s effective tax:


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Provision at U.S. notional statutory rate		35.0	%		35.0	%		35.0	%
Non-deductible stock-based compensation		6.9			5.6			13.3
Difference in U.S. and non-U.S. tax rates		(40.7	)		(40.0	)		(41.2	)
Benefits from utilization of general business credits		(6.8	)		(3.7	)		(20.3	)
Change in valuation allowance		5.6			3.4			18.4
Reserve		0.0			0.0			(9.2	)
Other		0.6			0.4			1.0

Effective tax rate		0.6	%		0.7	%		(3.0	)%

Unrecognized Tax Benefits Reconciliation

The following table reflects changes in the unrecognized tax benefits (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Unrecognized tax benefits as the beginning of the period	$	102,612		$	103,334		$	115,295
Increases related to prior year tax positions		987			494			—
Decreases related to prior year tax positions		(307	)		(149	)		(3,226	)
Increases related to current year tax positions		1,229			1,317			9,970
Settlements		(243	)		—			(2,191	)
Lapse in the statute of limitations		(9,529	)		(10,293	)		(22,682	)
Foreign exchange (gain) loss		1,545			7,909			6,168

Gross amounts of unrecognized tax benefits as of the end of the period	$	96,294		$	102,612		$	103,334

Commitments and Contingencies: (Tables)

12 Months Ended

Jan. 28, 2012

Schedule of Product Warranty Liability

The following table presents changes in the warranty accrual included in accrued liabilities in the Company’s Consolidated Balance Sheets (in thousands):


	Year Ended
	January 28, 2012			January 29, 2011			January 30, 2010
Beginning balance	$	2,439		$	1,965		$	2,093
Warranty expense		1,126			2,291			3,108
Acquisitions		408			—			—
Payments and other charges		(1,619	)		(1,817	)		(3,236	)

Ending balance	$	2,354		$	2,439		$	1,965

Operating Leases of Lessee Disclosure

Future minimum lease payments, net of estimated sublease as of January 28, 2012, are presented in the following table (in thousands):


Fiscal Year:	Minimum Lease Paymens		Sublease Income			Net Operating Leases
2013	$	68,333	$	(296	)	$	68,037
2014		27,691		(143	)		27,548
2015		21,896		—			21,896
2016		10,369		—			10,369
2017		6,318		—			6,318
Thereafter		4,382		—			4,382

Total future minimum lease payments	$	138,989	$	(439	)	$	138,550

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References + Details

Segment and Geographic Information: (Tables)

12 Months Ended

Jan. 28, 2012

Schedule Of Revenues From External Customers And Long Lived Assets By Geographical Areas Table


	Year Ended
Net Revenue:	January 28, 2012		January 29, 2011		January 30, 2010
United States	$	194,638	$	157,259	$	127,399
China		1,496,864		1,209,982		721,445
Thailand		531,073		602,639		484,862
Malaysia		420,382		348,271		301,504
Japan		60,404		99,173		192,126
Others		689,679		1,194,569		980,351

	$	3,393,040	$	3,611,893	$	2,807,687


Property and equipment, net:	January 28, 2012		January 29, 2011
Bermuda	$	8,256	$	9,797
China		32,205		27,361
Israel		26,061		18,389
Singapore		92,563		85,881
United States		207,848		202,049
Others		16,868		14,963

	$	383,801	$	358,440

Revenue from External Customers by Products and Services

The following table presents net revenue by end market (in thousands):


	Year Ended
Net Revenue by End Market	January 28, 2012		January 29, 2011		January 30, 2010
Storage products	$	1,560,772	$	1,650,465	$	1,574,370
Mobile and Wireless		968,706		1,124,442		531,518
Networking		697,865		683,103		596,561
Other		165,697		153,883		105,238

	$	3,393,040	$	3,611,893	$	2,807,687

Supplementary Data (Unaudited) (Tables)

12 Months Ended

Jan. 28, 2012

Schedule of Quarterly Financial Information


	Fiscal 2012
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(In thousands, except per share amounts)
Net revenue	$	802,402	$	897,520	$	950,417	$	742,701
Gross profit	$	467,927	$	519,403	$	538,317	$	401,588
Net income	$	146,861	$	192,392	$	195,121	$	80,717
Net income per share:
Basic	$	0.23	$	0.32	$	0.32	$	0.14
Diluted	$	0.22	$	0.31	$	0.32	$	0.13

	Fiscal 2011
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(In thousands, except per share amounts)
Net revenue	$	855,579	$	896,474	$	959,327	$	900,513
Gross profit	$	511,594	$	529,792	$	568,519	$	528,714
Net income	$	205,767	$	219,777	$	255,732	$	222,853
Net income per share:
Basic	$	0.32	$	0.34	$	0.39	$	0.34
Diluted	$	0.30	$	0.33	$	0.38	$	0.33

The Company and Its Significant Accounting Policies - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 28, 2012 USD ($)	Jan. 28, 2012 USD ($) Year Entity Customer	Jan. 29, 2011 USD ($) Entity Customer	Jan. 30, 2010 USD ($) Entity
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts \| $	$ 1.3	$ 1.3	$ 1.2	$ 1.0
Number of major customers \| Customer		3	4
Step-up fair market value adjustments to inventory acquired in acquisitions \| $	$ 4.4	$ 4.4
Number of distributors with more than 10% revenue \| Entity		1
Net unrealized gains (losses) reclassified as realized gains (losses) upon the sale of the related securities and maturity of the related contracts \| $		$ (0.3)	$ 2.0	$ (0.2)
Inventory turnover period, minimum (in days)		60 days
Inventory turnover period, maximum (in days)		90 days
Minimum likelihood that uncertain tax position will be sustained as a result of examination by income tax audits		50.00%
Standard Product Warranty Time Period		90 days
Typical Cases
Significant Accounting Policies [Line Items]
Standard Product Warranty Time Period		90 days
Non-Typical Cases \| Minimum
Significant Accounting Policies [Line Items]
Standard Product Warranty Time Period		1 year
Annual Grant
Significant Accounting Policies [Line Items]
Stock-based compensation, vest term (in years)		4 years
New Hire
Significant Accounting Policies [Line Items]
Stock-based compensation, vest term (in years)		5 years
Developed Technology Rights
Significant Accounting Policies [Line Items]
Intangible assets, minimum estimated economic lives (in years)		1
Intangible assets, maximum estimated economic lives (in years)		7
Core technology
Significant Accounting Policies [Line Items]
Intangible assets, minimum estimated economic lives (in years)		1
Intangible assets, maximum estimated economic lives (in years)		8
Customer intangible
Significant Accounting Policies [Line Items]
Intangible assets, minimum estimated economic lives (in years)		1
Intangible assets, maximum estimated economic lives (in years)		5
Trade name
Significant Accounting Policies [Line Items]
Intangible assets, minimum estimated economic lives (in years)		1
Intangible assets, maximum estimated economic lives (in years)		5
Buildings
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives (in years)		30
Building Improvements
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives (in years)		15
Machinery and Equipment
Significant Accounting Policies [Line Items]
Property and equipment, minimum estimated useful lives (in years)		3
Property and equipment, maximum estimated useful lives (in years)		7
Computer Software, Intangible Asset
Significant Accounting Policies [Line Items]
Property and equipment, minimum estimated useful lives (in years)		3
Property and equipment, maximum estimated useful lives (in years)		7
Furniture and Fixtures
Significant Accounting Policies [Line Items]
Property and equipment, minimum estimated useful lives (in years)		3
Property and equipment, maximum estimated useful lives (in years)		7
Customer Concentration Risk \| Western Digital
Significant Accounting Policies [Line Items]
Concentration of risk percentage	19.00%	19.00%	21.00%	24.00%
Customer Concentration Risk \| Scenario, Plan \| Western Digital
Significant Accounting Policies [Line Items]
Concentration of risk percentage	24.00%	24.00%
Customer Concentration Risk \| Scenario, Plan \| Seagate Technology
Significant Accounting Policies [Line Items]
Concentration of risk percentage	11.00%	11.00%
Credit Concentration Risk \| Accounts Receivable \| Customer A
Significant Accounting Policies [Line Items]
Concentration of risk percentage	15.00%	15.00%	13.00%
Credit Concentration Risk \| Accounts Receivable \| Customer B
Significant Accounting Policies [Line Items]
Concentration of risk percentage	12.00%	12.00%	12.00%
Credit Concentration Risk \| Accounts Receivable \| Customer C
Significant Accounting Policies [Line Items]
Concentration of risk percentage	11.00%	11.00%	12.00%
Credit Concentration Risk \| Accounts Receivable \| Customer E
Significant Accounting Policies [Line Items]
Concentration of risk percentage			11.00%
Cash equivalents \| Maximum
Significant Accounting Policies [Line Items]
Maturity period to classify investments	3 months
Short-term Investments \| Maximum
Significant Accounting Policies [Line Items]
Maturity period to classify investments	1 year
Short-term Investments \| Minimum
Significant Accounting Policies [Line Items]
Maturity period to classify investments	90 days

Sales to End Customers Comprising 10% or More of Net Revenue (Detail) - Customer Concentration Risk

Jan. 28, 2012

Jan. 29, 2011

Jan. 30, 2010

Western Digital

Concentration Risk [Line Items]

Concentration of risk percentage

19.00%

21.00%

24.00%

Research in Motion

Concentration Risk [Line Items]

Concentration of risk percentage

^[1]

14.00%

^[1]

Toshiba

Concentration Risk [Line Items]

Concentration of risk percentage

^[1]

15.00%

[1]	Less than 10% of net revenue

Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended
	Dec. 31, 2011	Apr. 30, 2011	Dec. 31, 2010	Jul. 31, 2010
Ethernet physical-layer transceivers ("PHY")
Business Acquisition [Line Items]
Business acquisition purchase price		$ 16,300
Business acquisition purchase price allocation, tangible assets		1,100
Business acquisition purchase price allocation, intangible assets		13,600
Business acquisition purchase price allocation, goodwill		$ 1,600
Xelerated Ab
Business Acquisition [Line Items]
Business acquisition purchase price	$ 75,200
Business acquisition purchase price allocation, tangible assets	9,440
Business acquisition purchase price allocation, amortizable intangible assets	51,800
Business acquisition purchase price allocation, goodwill	22,324
Fair value of acquired intangible assets	51,800
Xelerated Ab \| Purchased technology
Business Acquisition [Line Items]
Fair value of acquired intangible assets	25,800
Xelerated Ab \| Trade name
Business Acquisition [Line Items]
Fair value of acquired intangible assets	1,300
Xelerated Ab \| Retention bonuses
Business Acquisition [Line Items]
Business acquisition, additional contingent consideration	$ 4,300
Business acquisition, additional contingent consideration, payable term	2 years
Xelerated Ab \| Maximum
Business Acquisition [Line Items]
Business acquisition, additional contingent consideration	$ 5,000
Company engaged in development of powerline communication for home networking and broadband over powerline applications
Business Acquisition [Line Items]
Business acquisition purchase price				$ 20,700
Business acquisition purchase price allocation, tangible assets				300
Business acquisition purchase price allocation, amortizable intangible assets				7,800
Business acquisition purchase price allocation, IPR&D				9,700
Business acquisition purchase price allocation, goodwill				$ 2,900
Mobile software consulting firm specializing in user interface application software
Business Acquisition [Line Items]
Business acquisition purchase price			$ 11,800
Business acquisition purchase price allocation, amortizable intangible assets			7,500
Business acquisition purchase price allocation, goodwill			4,300
Business acquisition, additional contingent consideration			$ 9,300
Business acquisition, additional contingent consideration, payable term	2 years

Purchase Price Consideration of Xelerated (Detail) - Xelerated Ab $ in Thousands	Dec. 31, 2011 USD ($)
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Accounts receivable	$ 2,407
Inventory	6,481
Prepaid and other current assets	111
Property, plant and equipment	441
Tangible assets acquired	9,440
Goodwill	22,324
Intangible assets	51,800
Total assets acquired	83,564
Accounts payable	(256)
Accrued liabilities	(7,152)
Deferred tax liability	(1,000)
Net assets acquired	$ 75,156

Recognized Acquired Intangible Assets for Xelerated Based Upon Fair Value as of Acquisition Date (Detail) - Xelerated Ab $ in Thousands	1 Months Ended
	Dec. 31, 2011 USD ($) Year
Business Acquisition [Line Items]
Fair value	$ 51,800
Purchased technology
Business Acquisition [Line Items]
Fair value	$ 25,800
Estimated useful lives \| Year	6
Customer intangible
Business Acquisition [Line Items]
Fair value	$ 24,700
Estimated useful lives \| Year	5
Trade name
Business Acquisition [Line Items]
Fair value	$ 1,300
Estimated useful lives \| Year	5

Summary of Investments (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 1,482,394	$ 1,107,302
Gross Unrealized Gains	4,521	3,769
Gross Unrealized Losses	(2,104)	(1,889)
Estimated Fair Value	1,484,811	1,109,182
Short-term Investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	1,457,894	1,079,452
Gross Unrealized Gains	4,521	3,769
Gross Unrealized Losses	(819)	(265)
Estimated Fair Value	1,461,596	1,082,956
Short-term Investments \| Available-for-sale \| Corporate debt securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	685,563	648,278
Gross Unrealized Gains	3,081	3,208
Gross Unrealized Losses	(799)	(213)
Estimated Fair Value	687,845	651,273
Short-term Investments \| Available-for-sale \| Foreign Government Debt Securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	2,033
Gross Unrealized Gains	3
Estimated Fair Value	2,036
Short-term Investments \| Available-for-sale \| US government and agencies
Gain (Loss) on Investments [Line Items]
Amortized Cost	770,298	431,174
Gross Unrealized Gains	1,437	561
Gross Unrealized Losses	(20)	(52)
Estimated Fair Value	771,715	431,683
Long-term investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	24,500	27,850
Gross Unrealized Losses	(1,285)	(1,624)
Estimated Fair Value	23,215	26,226
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Gross Unrealized Losses	(1,285)
Long-term investments \| Available-for-sale \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	24,500	27,850
Gross Unrealized Losses	(1,285)	(1,624)
Estimated Fair Value	$ 23,215	$ 26,226

Investments - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Gain (Loss) on Investments [Line Items]
Gross Unrealized Losses	$ 2,104	$ 1,889
Cash, cash equivalents and short-term investments other than auction rate securities	2,200,000
Long-term investments
Gain (Loss) on Investments [Line Items]
Gross Unrealized Losses	1,285	$ 1,624
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Par value of auction rate securities	24,500
Gross Unrealized Losses	$ 1,285

Contractual Maturities of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Amortized Cost
Due in one year or less	$ 641,433	$ 560,190
Due between one and five years	816,461	519,262
Due over five years	24,500	27,850
Marketable Securities, Debt Maturities, Amortized Cost, Total	1,482,394	1,107,302
Estimated Fair Value
Due in one year or less	642,317	560,999
Due between one and five years	819,279	521,957
Due over five years	23,215	26,226
Estimated Fair Value	$ 1,484,811	$ 1,109,182

Summary of the Investments' Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 254,566	$ 205,043
Less than 12 months Unrealized Losses	(819)	(265)
12 months or more Fair Value	23,215	26,226
12 months or more Unrealized Losses	(1,285)	(1,624)
Total Fair Value	277,781	231,269
Total Unrealized Losses	(2,104)	(1,889)
Corporate debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	146,963	113,081
Less than 12 months Unrealized Losses	(799)	(213)
Total Fair Value	146,963	113,081
Total Unrealized Losses	(799)	(213)
U.S. Federal and State debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	107,603	91,962
Less than 12 months Unrealized Losses	(20)	(52)
Total Fair Value	107,603	91,962
Total Unrealized Losses	(20)	(52)
Auction rate securities
Investments, Unrealized Loss Position [Line Items]
12 months or more Fair Value	23,215	26,226
12 months or more Unrealized Losses	(1,285)	(1,624)
Total Fair Value	23,215	26,226
Total Unrealized Losses	$ (1,285)	$ (1,624)

Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010	Jan. 31, 2009
Cash, cash equivalents and marketable securities [Line Items]
Cash	$ 503,095	$ 340,236
Cash equivalents:
Commercial paper	12,500	9,797
Time deposits	205,060	159,938
Money market mutual fund	64,247	1,230,616
Federal agency notes		106,487
Total cash and cash equivalents	$ 784,902	$ 1,847,074	$ 1,105,428	$ 927,409

- Definition

Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 1
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7
-Footnote 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585

+ Details

- Definition

Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References + Details

- Definition

Debt securities issued by a United States government agency such as Government National Mortgage Association (Ginnie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac), and Federal National Mortgage Association (Fannie Mae), which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References + Details

Inventories (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Schedule of Inventory [Line Items]
Work-in-process	$ 190,779	$ 156,108
Finished goods	163,340	89,340
Inventories	$ 354,119	$ 245,448

Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Property, Plant and Equipment [Line Items]
Machinery and equipment	$ 489,481	$ 435,900
Buildings	144,596	144,596
Computer software	81,852	74,966
Land	69,246	69,246
Building improvements	42,083	41,200
Leasehold improvements	37,237	34,142
Furniture and fixtures	24,450	23,498
Construction in progress	9,846	8,469
Property, Plant and Equipment, Gross, Total	898,791	832,017
Less: Accumulated depreciation and amortization	(514,990)	(473,577)
Property and equipment, net	$ 383,801	$ 358,440

Supplemental Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Supplemental Financial Information [Line Items]
Depreciation expense	$ 63,500	$ 72,200	$ 87,300
Sale of investment in a privately held company, carrying value		2,300
Sale of investment in a privately held company, proceeds		10,200
Sale of investment in a privately held company, gain on sale		7,900
Amortization expense	$ 49,357	$ 79,538	$ 107,534
Anti-dilutive options excluded from the computation of diluted net income per share	21.0	12.2	14.3
Anti-dilutive options excluded from the computation of diluted net income per share, weighted average exercise price	$ 18.79	$ 21.39	$ 13.28
Technology and Other Licenses
Supplemental Financial Information [Line Items]
Amortization expense	$ 24,900	$ 21,000	$ 11,700
Market Based Option Award
Supplemental Financial Information [Line Items]
Anti-dilutive options excluded from the computation of diluted net income per share	3.1

Other Non-Current Assets (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Technology and other licenses	$ 50,212	$ 51,642
Deferred tax assets	31,064	27,671
Deferred compensation	5,419	6,169
Prepayments for foundry capacity	759	5,289
Severance fund	1,734	4,819
Investments in privately held companies	6,309	3,950
Other	12,649	11,840
Other non-current assets	$ 108,146	$ 111,380

- Definition

This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 6
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 22
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 18
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6383889&loc=d3e40346-111594

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596

+ Details

- Definition

The noncurrent portion as of the balance sheet date of the aggregate carrying amount of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after the valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, is classified according to the expected reversal date of the temporary difference.

+ References + Details

Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Schedule of Accrued Liabilities [Line Items]
Accrued rebates	$ 24,420	$ 32,405
Accrued royalties	16,896	14,018
Accrued legal expense	13,999	8,551
Accrued fees for tax, audit and other professional services	1,553	2,125
Customer advances for NRE services	4,170	3,515
Technology license obligations	5,250	4,850
Accrued sales/goods and services tax	1,218	3,679
Other	20,149	16,851
Accrued liabilities	$ 87,655	$ 85,994

Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Other Liabilities [Line Items]
Technology license obligations	$ 11,255	$ 19,218
Long-term accrued employee compensation	10,059	9,258
Long-term facilities consolidation	2,136	3,271
Accrued severance	1,983	3,226
Other	7,035	4,367
Other long-term liabilities	$ 32,468	$ 39,340

- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References + Details

Computations of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2010	May 01, 2010	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Numerator:
Net income:	$ 80,717	$ 195,121	$ 192,392	$ 146,861	$ 222,853	$ 255,732	$ 219,777	$ 205,767	$ 615,091	$ 904,129	$ 353,456
Weighted average common shares outstanding:
Weighted average shares - basic									607,857	648,347	623,934
Effect of dilutive securities:
Common share options and other									15,411	28,531	29,807
Weighted average shares - diluted									623,268	676,878	653,741
Net income per share:
Basic	$ 0.14	$ 0.32	$ 0.32	$ 0.23	$ 0.34	$ 0.39	$ 0.34	$ 0.32	$ 1.01	$ 1.39	$ 0.57
Diluted	$ 0.13	$ 0.32	$ 0.31	$ 0.22	$ 0.33	$ 0.38	$ 0.33	$ 0.30	$ 0.99	$ 1.34	$ 0.54

Changes in the Components of Other Comprehensive Income ("OCI") (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2010	May 01, 2010	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Net income	$ 80,717	$ 195,121	$ 192,392	$ 146,861	$ 222,853	$ 255,732	$ 219,777	$ 205,767	$ 615,091	$ 904,129	$ 353,456
Other comprehensive income
Net unrealized gain on marketable securities									198	2,417	1,087
Net unrealized gain (loss) on auction rate securities									339	695	(1,010)
Net unrealized gain (loss) on cash flow hedges									(848)	(1,134)	341
Other									(5)	(1)	(585)
Total comprehensive income									$ 614,775	$ 906,106	$ 353,289

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 8, 9, 10, 11, 12, 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A5
-Appendix A

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e557-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e540-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6508144

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 19

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e565-108580

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

+ Details

- Definition

Gross appreciation or the gross loss in value of the total unsold securities. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 19, 22, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-Subparagraph (e)-(g)
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 121
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 11
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain on marketable securities	$ 3,702	$ 3,504
Unrealized loss on auction rate securities	(1,285)	(1,624)
Unrealized loss on cash flow hedges	(1,641)	(793)
Other		5
Accumulated other comprehensive income	$ 776	$ 1,092

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

+ Details

Notional Amounts of Outstanding Forward Contracts (Detail) - Foreign Exchange Contract - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Derivative [Line Items]
Buy Contracts	$ 42,637	$ 56,360
Sell Contracts		3,698
Israeli shekel
Derivative [Line Items]
Buy Contracts	$ 42,637	56,360
Euro
Derivative [Line Items]
Sell Contracts		$ 3,698

Fair Value Measurements - Additional Information (Detail)	Jan. 28, 2012
Fair Value, Measurement Inputs, Disclosure [Line Items]
Percentage of total amount of assets measured using Level 3 valuation methodologies to total assets	0.40%

Financial Assets that were Accounted for at Fair Value (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Assets
Total assets	$ 1,768,352	$ 2,621,005
Cash equivalents \| Money market funds
Assets
Cash equivalents	64,247	1,230,616
Cash equivalents \| Corporate debt securities
Assets
Cash equivalents	12,500	9,797
Cash equivalents \| Time Deposit
Assets
Cash equivalents	205,060	159,938
Cash equivalents \| US government and agencies
Assets
Cash equivalents		106,487
Short-term Investments \| Corporate debt securities
Assets
Investments	687,845	651,273
Short-term Investments \| US Government State And Local Debt Securities
Assets
Investments	771,715	431,683
Short-term Investments \| Foreign Government
Assets
Investments	2,036
Long-term investments \| Auction rate securities
Assets
Investments	23,215	26,226
Other non-current assets \| Severance and related charges
Assets
Other non-current asset	1,734	4,819
Accrued Liabilities \| Forward contracts
Liabilities
Forward contracts	1,520	804
Prepaids and other current assets \| Forward contracts
Assets
Prepaids and other current assets		166
Level 1
Assets
Total assets	835,962	1,771,211
Level 1 \| Cash equivalents \| Money market funds
Assets
Cash equivalents	64,247	1,230,616
Level 1 \| Cash equivalents \| US government and agencies
Assets
Cash equivalents		106,487
Level 1 \| Short-term Investments \| US Government State And Local Debt Securities
Assets
Investments	771,715	431,683
Level 1 \| Other non-current assets \| Severance and related charges
Assets
Other non-current asset		2,425
Level 2
Assets
Total assets	909,175	823,568
Level 2 \| Cash equivalents \| Corporate debt securities
Assets
Cash equivalents	12,500	9,797
Level 2 \| Cash equivalents \| Time Deposit
Assets
Cash equivalents	205,060	159,938
Level 2 \| Short-term Investments \| Corporate debt securities
Assets
Investments	687,845	651,273
Level 2 \| Short-term Investments \| Foreign Government
Assets
Investments	2,036
Level 2 \| Other non-current assets \| Severance and related charges
Assets
Other non-current asset	1,734	2,394
Level 2 \| Accrued Liabilities \| Forward contracts
Liabilities
Forward contracts	1,520	804
Level 2 \| Prepaids and other current assets \| Forward contracts
Assets
Prepaids and other current assets		166
Level 3
Assets
Total assets	23,215	26,226
Level 3 \| Long-term investments \| Auction rate securities
Assets
Investments	$ 23,215	$ 26,226

Summary of the Change in Fair Values for Level 3 Items (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 26,226	$ 39,281
Purchases
Sales, redemption and settlement	(3,350)	(13,616)
Realized loss on sale		(134)
Unrealized gain included in accumulated other comprehensive income	339	695
Ending Balance	$ 23,215	$ 26,226

Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011
Goodwill [Line Items]
Beginning balance	$ 2,004,833	$ 1,997,662
Additions due to business combinations	27,158	7,171
Ending balance	$ 2,031,991	$ 2,004,833

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Acquired Intangible Assets, Net (Detail)
$ in Thousands

12 Months Ended

Jan. 28, 2012

USD ($)

Year

Jan. 29, 2011

USD ($)

Acquired Finite-Lived Intangible Assets [Line Items]

Gross Carrying Amounts

$ 383,431

$ 371,425

Accumulated Amortization and Write-Offs

(241,926)

(246,794)

Net Carrying Amount

$ 141,505

124,631

Purchased technology

Acquired Finite-Lived Intangible Assets [Line Items]

Minimum useful lives | Year

Maximum useful lives | Year

Gross Carrying Amounts

$ 103,490

64,125

Accumulated Amortization and Write-Offs

(50,906)

(36,962)

Net Carrying Amount

$ 52,584

27,163

Core technology

Acquired Finite-Lived Intangible Assets [Line Items]

Minimum useful lives | Year

Maximum useful lives | Year

Gross Carrying Amounts

$ 178,000

178,800

Accumulated Amortization and Write-Offs

(142,932)

(121,509)

Net Carrying Amount

$ 35,068

57,291

Trade name

Acquired Finite-Lived Intangible Assets [Line Items]

Minimum useful lives | Year

Maximum useful lives | Year

Gross Carrying Amounts

$ 1,500

200

Accumulated Amortization and Write-Offs

(232)

(149)

Net Carrying Amount

$ 1,268

Customer intangible

Acquired Finite-Lived Intangible Assets [Line Items]

Minimum useful lives | Year

Maximum useful lives | Year

Gross Carrying Amounts

$ 89,900

118,600

Accumulated Amortization and Write-Offs

(47,856)

(88,174)

Net Carrying Amount

$ 42,044

30,426

In-process research and development

Acquired Finite-Lived Intangible Assets [Line Items]

Useful Lives | Year

^[1]

Gross Carrying Amounts

$ 10,541

9,700

Net Carrying Amount

$ 10,541

$ 9,700

[1]

Goodwill and Acquired Intangible Assets - Additional Information (Detail) $ in Millions	12 Months Ended
	Jan. 30, 2010 USD ($)
Goodwill and Intangible Assets Disclosure [Line Items]
Write off of acquisition related intangible assets	$ 1.0

Future Amortization Expense of Identified Intangibles (Detail) - In Process Research and Development Excluded $ in Thousands	12 Months Ended
	Jan. 28, 2012 USD ($)
Fiscal year
2013	$ 50,927
2014	36,254
2015	14,852
2016	12,088
2017	10,896
Thereafter	5,947
Finite-Lived Intangible Assets, Future Amortization Expense, Total	$ 130,964

Restructuring - Additional Information (Detail) $ in Thousands	12 Months Ended
	Jan. 28, 2012 USD ($)	Jan. 29, 2011 USD ($) Entity	Jan. 30, 2010 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 21,700
Proceeds from sale of building held for sale	$ 6,800
Research and development
Restructuring Cost and Reserve [Line Items]
Charge to write-down the carrying value to fair value of building classified as held for sale		$ 1,100
Severance and related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges			8,640
Facilities and related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,619	3,420	3,884
Equipment and other related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 237	$ 94	$ 9,139
Subleased Facility [Member]
Restructuring Cost and Reserve [Line Items]
Number of facilities \| Entity		2
Anticipated Sale of Facility
Restructuring Cost and Reserve [Line Items]
Number of facilities \| Entity		1

Analysis of the Components of the Restructuring Charges and the Payments Made (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of period	$ 3,306	$ 5,397	$ 7,685
Non-cash adjustment	(506)	(1,272)	(4,882)
Net cash payments	(1,739)	(4,002)	(19,069)
Adjustments to previous assumptions		(331)
Restructuring liabilities, end of period	2,917	3,306	5,397
Restructuring charges			21,700
Severance and related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges			8,640
Facilities and related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,619	3,420	3,884
Equipment and other related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 237	$ 94	$ 9,139

- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

+ References + Details

Restructuring Charges (Detail) - USD ($) $ in Thousands	12 Months Ended
Restructuring Charges (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 1,856	$ 3,183	$ 21,663
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	728	1,966	15,046
Selling and marketing
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	8		1,838
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 1,120	$ 1,217	$ 4,779

Shareholders' Equity - Additional Information (Detail)	1 Months Ended			12 Months Ended
Shareholders' Equity - Additional Information (Detail)	Mar. 16, 2012 USD ($) $ / shares shares	Dec. 24, 2011 USD ($)	Aug. 31, 2010 USD ($)	Feb. 02, 2013 USD ($)	Jan. 28, 2012 USD ($) Year $ / shares shares	Jan. 29, 2011 USD ($) $ / shares shares	Jan. 30, 2010 USD ($) $ / shares shares	Jul. 30, 2011 USD ($)	Mar. 26, 2011 USD ($)	Jan. 31, 2009 shares
Stockholders Equity Note [Line Items]
Common shares, shares authorized					992,000,000	992,000,000
Common shares, par value \| $ / shares					$ 0.002	$ 0.002
Preferred shares, shares authorized					8,000,000	8,000,000
Preferred shares, par value \| $ / shares					$ 0.002	$ 0.002
Shares reserved for issuance					55,591,000	56,325,000	70,966,000			85,054,000
Shares Granted					6,626,000	2,018,000	1,819,000
Aggregate intrinsic value of stock options exercised \| $					$ 41,800,000	$ 162,900,000	$ 124,500,000
Stock-based compensation capitalized in inventory \| $					2,100,000	$ 1,500,000	$ 1,600,000
Cash and short-term investments \| $					$ 2,200,000,000
Acquisition
Stockholders Equity Note [Line Items]
Common shares reserved for issuance upon exercise of outstanding options assumed from acquisitions					124,904
Acquisition \| Minimum
Stockholders Equity Note [Line Items]
Stock option, expiration term					8 years
Stock option, vesting term					4 years
Acquisition \| Maximum
Stockholders Equity Note [Line Items]
Stock option, expiration term					10 years
Stock option, vesting term					5 years
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Unrecognized share based compensation cost, weighted-average period of recognition (in years) \| Year					1.5
Restricted stock units, aggregate intrinsic value \| $					$ 133,100,000
Restricted stock units vested and expected to vest					8,400,000
Employee Stock Option Plan, 1995 Plan
Stockholders Equity Note [Line Items]
Stock option, expiration term					10 years
Stock Option Plan, percentage to vest after vesting commencement date					20.00%
Stock Option Plan, vesting rate of remaining shares					One-sixtieth per month
Shares reserved for issuance					383,400,000
Number of shares available for future issuance					119,400,000
Employee Stock Option Plan, 1995 Plan \| Remaining vesting period after 1 year of grant
Stockholders Equity Note [Line Items]
Stock option, vesting term					48 months
Employee Stock Option Plan, 1995 Plan \| Incentive Stock Option
Stockholders Equity Note [Line Items]
Stock option, expiration term					5 years
Stock option, purchase price as percentage of fair market value					110.00%
Directors Stock Option Plan, 1997 Plan \| Upon Appointment To Board of Directors
Stockholders Equity Note [Line Items]
Number of shares authorized to a director					30,000
Stock Option Plan, percentage to vest after vesting commencement date					20.00%
Stock Option Plan, vesting rate of remaining shares					one-sixtieth per month
Directors Stock Option Plan, 1997 Plan \| Upon Appointment To Board of Directors \| Remaining vesting period after 1 year of grant
Stockholders Equity Note [Line Items]
Stock option, vesting term					48 months
Directors Stock Option Plan, 1997 Plan \| On Date Of Annual Meeting Of Shareholders
Stockholders Equity Note [Line Items]
Number of shares authorized to a director					6,000
Stock Option Plan, vesting rate of remaining shares					one-twelfth per month
Stock option, vesting term					12 months
Director Stock Incentive Plan, 2007 Plan
Stockholders Equity Note [Line Items]
Shares reserved for issuance					750,000
Number of shares available for future issuance					412,000
Director Stock Incentive Plan, 2007 Plan \| Annual Grant
Stockholders Equity Note [Line Items]
Stock option award \| $				$ 110,000
Director Stock Incentive Plan, 2007 Plan \| Upon Appointment To Board of Directors
Stockholders Equity Note [Line Items]
Number of shares authorized to a director					50,000
Director Stock Incentive Plan, 2007 Plan \| Upon Appointment To Board of Directors \| First Anniversary Of Grant Date
Stockholders Equity Note [Line Items]
Stock Option Plan, vesting rate of remaining shares					one-third
Director Stock Incentive Plan, 2007 Plan \| Upon Appointment To Board of Directors \| Second Anniversary Of Grant Date and Thereafter
Stockholders Equity Note [Line Items]
Stock Option Plan, vesting rate of remaining shares					one-third
Director Stock Incentive Plan, 2007 Plan \| Upon ReElection By Shareholders
Stockholders Equity Note [Line Items]
Number of shares authorized to a director					9,000
Stock Option Plan, percentage to vest after vesting commencement date					100.00%
Director Stock Incentive Plan, 2007 Plan \| Restricted Stock Awards
Stockholders Equity Note [Line Items]
Annual RSU Award \| $					$ 70,000
Annual RSU awards, percentage to vest after vesting commencement date					100.00%
Director Stock Incentive Plan, 2007 Plan \| Restricted Stock Awards \| Annual Grant
Stockholders Equity Note [Line Items]
Annual RSU Award \| $				$ 110,000
Annual RSU awards, percentage to vest after vesting commencement date				100.00%
Employee Stock Purchase Plan, 2000 Restated Plan
Stockholders Equity Note [Line Items]
Employee stock purchase plan, percentage discount of purchase price per share of common shares					15.00%
Number of shares available for future issuance					26,300,000
Employee stock purchase plan, "look-back" period					24 months
Employee stock purchase plan, purchase price					85.00%
Employee stock purchase plan, shares issued					4,900,000	10,900,000	7,300,000
Employee stock purchase plan, weighted-average price \| $ / shares					$ 12.48	$ 5.27	$ 4.95
Employee Stock Purchase Plan, 2000 Plan
Stockholders Equity Note [Line Items]
Employee stock purchase plan, "look-back" period					6 months
Market Based Option Award
Stockholders Equity Note [Line Items]
Stock option, vesting term					2 years 9 months
Shares reserved for issuance					3,124,000
Shares Granted					3,149,000
Terms of options					If the market price condition is not met within five years from the date of grant, the options automatically expire.
Options vested and expected to vest, aggregate intrinsic value \| $					$ 1,000,000
Options vested and expected to vest, weighted average remaining contractual term (in years) \| Year					9.2
Time Based Option Award
Stockholders Equity Note [Line Items]
Shares reserved for issuance					52,467,000	56,325,000	70,966,000			85,054,000
Shares Granted					3,477,000	2,018,000	1,819,000
Options vested and expected to vest, aggregate intrinsic value \| $					$ 234,700,000
Options vested and expected to vest, weighted average remaining contractual term (in years) \| Year					4.6
Options exercisable, aggregate intrinsic value \| $					$ 198,500,000
Options exercisable, weighted average remaining contractual term (in years) \| Year					3.9
Unrecognized share based compensation cost, weighted-average period of recognition (in years) \| Year					1.9
Combined Option Plan And Stock Award Activity
Stockholders Equity Note [Line Items]
Unrecognized share based compensation cost \| $					$ 157,000,000
Stock Repurchase Plan 2010
Stockholders Equity Note [Line Items]
Share repurchase program, terms					In August 2010, the Company announced that its board of directors had authorized a stock repurchase program of up to $500 million of the Company’s common shares in open market, privately negotiated or block transactions.
Share repurchase program, amount authorized \| $			$ 500,000,000
Common Stock Repurchase Program
Stockholders Equity Note [Line Items]
Share repurchase program, terms					In March, July and December 2011, the Company announced that its board of directors authorized the Company to repurchase up to an additional $500 million, respectively, for a total of $2.0 billion, of its outstanding common shares. The repurchase program is subject to market conditions and other factors and does not obligate the Company to repurchase any dollar amount or number of its common shares. The program may be extended, modified, suspended or discontinued at any time. The future repurchases, which are expected to be funded from the Company’s current cash and short-term investments position of over $2.2 billion, may occur in open market, privately negotiated or block transactions.
Share repurchase program, additional authorized amount \| $		$ 500,000,000						$ 500,000,000	$ 500,000,000
Share repurchase program, amount authorized \| $		$ 2,000,000,000
Share repurchase program, shares repurchased					87,800,000	4,900,000
Share repurchase program, amount repurchased \| $					$ 1,300,000,000	$ 87,500,000
Share repurchase program, amount remaining \| $					571,600,000
Share repurchase program, total amount of repurchases \| $					$ 1,430,000,000
Common Stock Repurchase Program \| Repurchase of Equity
Stockholders Equity Note [Line Items]
Share repurchase program, shares repurchased	5,200,000
Share repurchase program, amount repurchased \| $	$ 77,900,000
Share repurchase program, additional shares repurchased, average price per share \| $ / shares	$ 15.12
Share repurchase program, total amount of repurchases \| $	$ 1,510,000,000

Stock Option Plan Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Options Outstanding
Beginning Balance	56,325	70,966	85,054
Granted	6,626	2,018	1,819
Canceled/Forfeited	(1,679)	(2,700)	(3,726)
Expired
Exercised or issued	(5,681)	(13,959)	(12,181)
Ending Balance	55,591	56,325	70,966
Vested or expected to vest at January 28, 2012	54,354
Exercisable at January 28, 2012	42,122
Weighted Average Exercise Price
Vested or expected to vest at January 28, 2012	$ 12.66
Exercisable at January 28, 2012	12.49
Beginning Balance	11.96	$ 11.28	$ 10.81
Granted	15.37	20.17	13.85
Canceled/Forfeited	14.58	18.47	15.45
Expired
Exercised or issued	7.95	8.45	7.12
Ending Balance	$ 12.70	$ 11.96	$ 11.28
Time Based Option Award
Options Outstanding
Beginning Balance	56,325	70,966	85,054
Granted	3,477	2,018	1,819
Canceled/Forfeited	(1,654)	(2,700)	(3,726)
Expired
Exercised or issued	(5,681)	(13,959)	(12,181)
Ending Balance	52,467	56,325	70,966
Vested or expected to vest at January 28, 2012	51,656
Exercisable at January 28, 2012	42,122
Weighted Average Exercise Price
Vested or expected to vest at January 28, 2012	$ 12.51
Exercisable at January 28, 2012	12.49
Beginning Balance	11.96	$ 11.28	$ 10.81
Granted	15.31	20.17	13.85
Canceled/Forfeited	14.57	18.47	15.45
Expired
Exercised or issued	7.95	8.45	7.12
Ending Balance	$ 12.53	$ 11.96	$ 11.28
Market Based Option Award
Options Outstanding
Granted	3,149
Canceled/Forfeited	(25)
Expired
Ending Balance	3,124
Vested or expected to vest at January 28, 2012	2,698
Weighted Average Exercise Price
Vested or expected to vest at January 28, 2012	$ 15.43
Granted	15.43
Canceled/Forfeited	15.43
Expired
Ending Balance	$ 15.43

Activity Related to the Non-Vested Portion of the Restricted Stock Units (Detail) - $ / shares shares in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Restricted Stock Units Outstanding
Beginning Balance	5,486	2,746	6,499
Granted	6,877	4,718	78
Vested	(2,014)	(1,619)	(3,376)
Canceled/Forfeited	(703)	(359)	(455)
Ending Balance	9,646	5,486	2,746
Restricted Stock Units (RSUs)
Weighted Average Grant Date Fair Value
Beginning Balance	$ 18.75	$ 8.99	$ 9.58
Granted	15.80	20.76	13.49
Vested	15.90	9.13	10.20
Canceled/Forfeited	16.81	13.87	6.50
Ending Balance	$ 17.38	$ 18.75	$ 8.99

Total Stock Compensation by Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 119,863	$ 118,405	$ 126,599
Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	6,995	7,522	10,690
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	85,924	82,524	89,766
Selling and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	12,920	11,769	15,298
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 14,024	$ 16,590	$ 10,845

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Weighted Average Assumptions used to Calculate the Fair Value of Each Time-Based Equity Award Using Black-Scholes Option Pricing Model (Detail)	12 Months Ended
	Jan. 28, 2012 Year $ / shares	Jan. 29, 2011 Year $ / shares	Jan. 30, 2010 Year $ / shares
Time Based Option Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value \| $ / shares	$ 6.05	$ 9.33	$ 6.32
Volatility	44.00%	53.00%	53.00%
Expected term (in years) \| Year	4.8	4.7	4.6
Risk-free interest rate	2.00%	2.20%	2.10%
Dividend yield
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value \| $ / shares	$ 4.63	$ 5.91	$ 4.34
Volatility	44.00%	53.00%	51.00%
Expected term (in years) \| Year	1.1	0.5	1.1
Risk-free interest rate	0.10%	0.20%	0.60%
Dividend yield

Fair Value of Each Market-Based Option Award Estimated Using Monte Carlo Simulation Model (Detail) - Market Based Option Award	12 Months Ended
	Jan. 28, 2012 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value	$ 5.08
Expected Volatility	42.00%
Risk-free interest rate, minimum	0.85%
Risk-free interest rate, maximum	3.59%
Dividend yield

U.S. and Non-U.S. Components of Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]
U.S. operations	$ 28,039	$ 22,647	$ 12,714
Non-U.S. operations	591,020	887,815	330,396
Income before income taxes, net	$ 619,059	$ 910,462	$ 343,110

Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Current income tax expense (benefit):
Federal	$ 8,183	$ 1,111	$ (35,778)
State	99	49	576
Foreign	(1,069)	3,282	11,500
Total current income tax expense	7,213	4,442	(23,702)
Deferred income tax expense (benefit):
Federal	(1,361)	7,025	(254)
State	1,078	3,037	(556)
Foreign	(2,962)	(8,171)	14,166
Total deferred income tax expense (benefit)	(3,245)	1,891	13,356
Total provision (benefit) for income taxes	$ 3,968	$ 6,333	$ (10,346)

Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Jan. 29, 2011
Deferred tax assets:
Federal and California research and other tax credits	$ 259,635	$ 225,695
Reserves and accruals	32,328	29,718
Stock compensation	2,678	2,880
Net operating losses	21,813	19,643
Gross deferred tax assets	316,454	277,936
Valuation allowance	(259,316)	(224,853)
Total deferred tax assets	57,138	53,083
Total deferred tax liabilities	(15,405)	(14,595)
Net deferred tax assets	$ 41,733	$ 38,488

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Income Taxes [Line Items]
Deferred tax assets, non-current	$ 31,064	$ 27,671
Unrecognized tax benefit that would affect the effective income tax rate if recognized	3,200
Unrecognized tax benefit that would affect the effective income tax rate if recognized	78,800
Unrecognized tax benefit, interest accrued	28,300	25,900	$ 22,200
Unrecognized tax benefit, penalties accrued	7,000	7,500	$ 7,700
Research
Income Taxes [Line Items]
Tax credit carryforwards		$ 259,600
Valuation allowance commentary		During fiscal 2012, the Company generated research credits for U.S. federal and states far in excess of its current year tax liabilities. Based on the available objective positive and negative evidence, the Company has determined that it is more likely than not the federal and California research credits and certain acquired net operating losses will not be realized and therefore the Company has provided a full valuation allowance against these credits
Tax credit carryforwards, increase in valuation allowance	34,500
Tax credit carryforwards, related to an increase in research credits	34,700
Decrease in net deferred tax assets, amount attributable to net decrease in alternative minimum tax and foreign net operating losses	200
Foreign Country
Income Taxes [Line Items]
Net operating loss carryforwards, foreign	$ 84,900
Net operating loss carryforwards, expiration date	The losses in non-U.S. components can be carried forward indefinitely
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Net operating loss carryforwards, U.S. federal	$ 2,700
Net operating loss carryforwards, expiration date	The federal carryforwards will expire in various fiscal years between 2021 and 2031
Internal Revenue Service (IRS) \| Research
Income Taxes [Line Items]
Tax credit carryforwards	$ 173,700
Tax credit carryforward, expiration dates	Expire through fiscal 2032
Net operating loss carryforwards, amount attributable to excess tax benefits from stock options	$ 48,000
California State
Income Taxes [Line Items]
Net operating loss carryforwards, state	$ 7,500
Net operating loss carryforwards, expiration date	The California carryforwards will expire at various fiscal years between 2015 and 2022, if not utilized before these years
California State \| Research
Income Taxes [Line Items]
Tax credit carryforwards	$ 169,800
Tax credit carryforward, expiration dates	Which can be carryforward indefinitely
Net operating loss carryforwards, amount attributable to excess tax benefits from stock options	$ 49,900
Other State \| Research and Investment
Income Taxes [Line Items]
Tax credit carryforwards	$ 14,100
Tax credit carryforward, expiration dates	Expire through fiscal 2027
Economic Development Board of Singapore Pioneer Status
Income Taxes [Line Items]
Expiration of tax exemption	10 years
Tax holidays, per share effect on earnings	$ 0.01	$ 0.01
Tax savings associated with the tax holiday	$ 3,100	$ 7,900
Economic Development Board of Singapore Pioneer Status \| Extended Expiration
Income Taxes [Line Items]
Expiration of tax exemption	15 years
Israeli Law of Approved or Benefited Enterprise
Income Taxes [Line Items]
Tax holidays, tax savings amount	$ 13,600	$ 18,400
Tax holidays, per share effect on earnings	$ 0.02	$ 0.03
Israeli Law of Approved or Benefited Enterprise \| Minimum
Income Taxes [Line Items]
Expiration of tax exemption	10 years
Tax holidays, reduced income tax rate	0.00%
Israeli Law of Approved or Benefited Enterprise \| Maximum
Income Taxes [Line Items]
Expiration of tax exemption	15 years
Tax holidays, reduced income tax rate	10.00%
Swiss Federal Department of Economy and the Vaud Cantonal Tax Administration Tax Holiday
Income Taxes [Line Items]
Expiration of tax exemption	10 years
Tax holidays, tax savings amount	$ 4,700	$ 4,500
Tax holidays, per share effect on earnings	$ 0.01	$ 0.01

Reconciliation of Statutory Federal Income Tax to Effective Tax (Detail)	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Reconciliation of Statutory Federal Tax Rate [Line Items]
Provision at U.S. notional statutory rate	35.00%	35.00%	35.00%
Non-deductible stock-based compensation	6.90%	5.60%	13.30%
Difference in U.S. and non-U.S. tax rates	(40.70%)	(40.00%)	(41.20%)
Benefits from utilization of general business credits	(6.80%)	(3.70%)	(20.30%)
Change in valuation allowance	5.60%	3.40%	18.40%
Reserve	0.00%	0.00%	(9.20%)
Other	0.60%	0.40%	1.00%
Effective tax rate	0.60%	0.70%	(3.00%)

Changes in Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits as the beginning of the period	$ 102,612	$ 103,334	$ 115,295
Increases related to prior year tax positions	987	494
Decreases related to prior year tax positions	(307)	(149)	(3,226)
Increases related to current year tax positions	1,229	1,317	9,970
Settlements	(243)		(2,191)
Lapse in the statute of limitations	(9,529)	(10,293)	(22,682)
Foreign exchange (gain) loss	1,545	7,909	6,168
Gross amounts of unrecognized tax benefits as of the end of the period	$ 96,294	$ 102,612	$ 103,334

Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Defined Contribution Pension Plan 401k
Postemployment Benefits Disclosure [Line Items]
401(k) savings and investment plan, general description of the plan	The Company sponsors a 401(k) savings and investment plan that allows eligible U.S. employees to participate by making pre-tax contributions to the 401(k) plan ranging from 1% to 80% of eligible earnings subject to a required annual limit. The Company matches 100% of the employee contribution up to $500 per eligible employee on a quarterly basis. The participant must be employed by the Company on the last day of the calendar quarter to qualify for the match. At the end of the calendar year, the eligible employees receive a true-up match equal to the accumulated employee contribution for the calendar year up to $2,000.
Employer match contributions	$ 4,800,000	$ 4,500,000	$ 2,100,000
Defined Contribution Pension Plan 401k \| Minimum
Postemployment Benefits Disclosure [Line Items]
Employee pre-tax contributions to 401(k)	1.00%
Defined Contribution Pension Plan 401k \| Maximum
Postemployment Benefits Disclosure [Line Items]
Employee pre-tax contributions to 401(k)	80.00%
Defined Contribution Pension Plan 401k \| Maximum \| Quarterly Match
Postemployment Benefits Disclosure [Line Items]
Employer match contributions	$ 500
Defined Contribution Pension Plan 401k \| Maximum \| Annual True Up Match
Postemployment Benefits Disclosure [Line Items]
Employer match contributions	2,000
Defined Contribution Plans Non-U.S Locations
Postemployment Benefits Disclosure [Line Items]
Employer match contributions	$ 15,700,000	$ 15,600,000	$ 11,500,000

Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Apr. 30, 2011 Plaintiff	Jan. 28, 2012 USD ($)	Jan. 29, 2011 USD ($)	Jan. 30, 2010 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Standard warranty period		90 days
Extended warranty period		1 year
Description of extended warranty period		warranty period can extend to more than one year based on contractual agreements
Loss Contingency, Lawsuit Filing Date	In 2001
IPO Securities Litigation, jurisdiction of the court of law	two putative class action lawsuits were filed in the United States District Court for the Southern District of New York
IPO Securities Litigation, number of class action lawsuits filed \| Plaintiff	2
IPO Securities Litigation, the claim	concerning certain alleged underwriting practices related to the Company’s initial public offering (the “IPO”) on June 29, 2000
IPO Securities Litigation, named defendants	The actions were consolidated and a consolidated complaint was filed, naming as defendants certain investment banks that participated in the IPO, the Company, and two of its officers, one of whom is also a director.
IPO Securities Litigation, laws alleged to have been violated	Plaintiffs claimed that defendants violated certain provisions of the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended (the “Exchange Act”), by allegedly failing to disclose that the underwriters received “excessive” and undisclosed commissions and entered into unlawful “tie-in” agreements with certain of their clients
IPO Securities Litigation, damages sought	The consolidated complaint seeks unspecified damages, interest and fees
IPO Securities Litigation, action taken by defendant	Defendants in the coordinated proceedings moved to dismiss the actions
IPO Securities Litigation, action taken by the trial court	February 2003, the trial court granted the motions in part and denied them in part, allowing certain claims to proceed.
Operating Lease Expense
Commitments and Contingencies Disclosure [Line Items]
Rent expense, net of sublease income		$ 20.5	$ 17.1	$ 18.5
Manufacturing Expense
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment, outstanding commitment		$ 226.6

Changes in Warranty Accrual Included in Accrued Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Product Liability Contingency [Line Items]
Beginning balance	$ 2,439	$ 1,965	$ 2,093
Warranty expense	1,126	2,291	3,108
Acquisitions	408
Payments and other charges	(1,619)	(1,817)	(3,236)
Ending balance	$ 2,354	$ 2,439	$ 1,965

Future Minimum Lease Payments, Net of Estimated Sublease Income under Operating and Capital Leases (Detail) $ in Thousands	Jan. 28, 2012 USD ($)
Fiscal Year:
2013	$ 68,037
2014	27,548
2015	21,896
2016	10,369
2017	6,318
Thereafter	4,382
Total future minimum lease payments	138,550
Minimum Lease Payments
Fiscal Year:
2013	68,333
2014	27,691
2015	21,896
2016	10,369
2017	6,318
Thereafter	4,382
Total future minimum lease payments	138,989
Sublease Income
Fiscal Year:
2013	(296)
2014	(143)
Total future minimum lease payments	$ (439)

Net Revenue and Long-Lived Asset Information based on Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2010	May 01, 2010	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Net Revenue:
Net revenue	$ 742,701	$ 950,417	$ 897,520	$ 802,402	$ 900,513	$ 959,327	$ 896,474	$ 855,579	$ 3,393,040	$ 3,611,893	$ 2,807,687
Property and equipment, net:
Property and equipment, net	383,801				358,440				383,801	358,440
United States
Net Revenue:
Net revenue									194,638	157,259	127,399
Property and equipment, net:
Property and equipment, net	207,848				202,049				207,848	202,049
China
Net Revenue:
Net revenue									1,496,864	1,209,982	721,445
Property and equipment, net:
Property and equipment, net	32,205				27,361				32,205	27,361
Thailand
Net Revenue:
Net revenue									531,073	602,639	484,862
Malaysia
Net Revenue:
Net revenue									420,382	348,271	301,504
Japan
Net Revenue:
Net revenue									60,404	99,173	192,126
Others
Net Revenue:
Net revenue									689,679	1,194,569	$ 980,351
Property and equipment, net:
Property and equipment, net	16,868				14,963				16,868	14,963
Bermuda
Property and equipment, net:
Property and equipment, net	8,256				9,797				8,256	9,797
Israel
Property and equipment, net:
Property and equipment, net	26,061				18,389				26,061	18,389
Singapore
Property and equipment, net:
Property and equipment, net	$ 92,563				$ 85,881				$ 92,563	$ 85,881

Net Revenue by End Market (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Net Revenue by End Market (Detail) - USD ($) $ in Thousands	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2010	May 01, 2010	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Net Revenue by End Market
Net revenue	$ 742,701	$ 950,417	$ 897,520	$ 802,402	$ 900,513	$ 959,327	$ 896,474	$ 855,579	$ 3,393,040	$ 3,611,893	$ 2,807,687
Storage products
Net Revenue by End Market
Net revenue									1,560,772	1,650,465	1,574,370
Mobile and Wireless
Net Revenue by End Market
Net revenue									968,706	1,124,442	531,518
Networking
Net Revenue by End Market
Net revenue									697,865	683,103	596,561
Other
Net Revenue by End Market
Net revenue									$ 165,697	$ 153,883	$ 105,238

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Veri Silicon Holdings Company Limited \| Technology License Agreement
Related Party Transaction [Line Items]
License Agreement	MIL is party to a technology license agreement with VeriSilicon Holdings Co., Ltd. (“VeriSilicon”). MIL assumed this technology license agreement between VeriSilicon and UTStarcom, Inc. after the Company’s acquisition of the semiconductor business of UTStarcom in December 2005. MIL has subsequently entered into various addenda to this agreement for additional technology beyond the scope of the original agreement. During fiscal 2012, MIL entered into three new addenda with VeriSilicon related to the technology license agreement. In addition, in September 2010, MIL entered into a services agreement with VeriSilicon, pursuant to which VeriSilicon has agreed to provide design support services to MIL pursuant to which VeriSilicon helped on two projects for MIL during fiscal 2012.
Liability to related party	$ 1.0
Veri Silicon Holdings Company Limited \| Technology License Agreement \| License and Support Fees
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 1.2	$ 2.6
Vivante Corporation \| Technology License Agreement
Related Party Transaction [Line Items]
License Agreement	In December 2009, MIL entered into a technology license agreement with Vivante Corporation ("Vivante") that provides for the license of graphics technology and associated services. This agreement restates, expands and succeeds previous agreements between the parties for the same technology.
Vivante Corporation \| Restated Technology Agreement
Related Party Transaction [Line Items]
Liability to related party	$ 5.8
Vivante Corporation \| Restated Technology Agreement \| License and Support Fees
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 5.8	$ 5.7
Vivante Corporation \| Restated Technology Agreement \| License Fees
Related Party Transaction [Line Items]
Expenses from transactions with related party			$ 12.0
Payment period			3 years
Vivante Corporation \| Restated Technology Agreement \| Support Fees
Related Party Transaction [Line Items]
Maintenance fees			10.00%
Payment period			3 years

Quarterly Unaudited Consolidated Statements of Operations Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2010	May 01, 2010	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Quarterly Financial Information [Line Items]
Net revenue	$ 742,701	$ 950,417	$ 897,520	$ 802,402	$ 900,513	$ 959,327	$ 896,474	$ 855,579	$ 3,393,040	$ 3,611,893	$ 2,807,687
Gross profit	401,588	538,317	519,403	467,927	528,714	568,519	529,792	511,594
Net income	$ 80,717	$ 195,121	$ 192,392	$ 146,861	$ 222,853	$ 255,732	$ 219,777	$ 205,767	$ 615,091	$ 904,129	$ 353,456
Net income per share:
Basic	$ 0.14	$ 0.32	$ 0.32	$ 0.23	$ 0.34	$ 0.39	$ 0.34	$ 0.32	$ 1.01	$ 1.39	$ 0.57
Diluted	$ 0.13	$ 0.32	$ 0.31	$ 0.22	$ 0.33	$ 0.38	$ 0.33	$ 0.30	$ 0.99	$ 1.34	$ 0.54

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 20

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 7
-Paragraph 18

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Allowance for doubtful accounts and sales return reserve
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 7,366	$ 5,912	$ 3,206
Additions	4,393	12,217	6,714
Deductions	(9,096)	(10,763)	(4,008)
Balance at End of Year	2,663	7,366	5,912
Deferred tax valuation
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	224,853	197,710	134,576
Additions	34,694	30,621	77,353
Deductions	(231)	(3,478)	(14,219)
Balance at End of Year	$ 259,316	$ 224,853	$ 197,710