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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Apr. 30, 2011	May 27, 2011
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2011
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Trading Symbol	MRVL
Entity Registrant Name	MARVELL TECHNOLOGY GROUP LTD
Entity Central Index Key	0001058057
Current Fiscal Year End Date	--01-28
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		611,400,000

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Current assets:
Cash and cash equivalents	$ 782,401	$ 1,847,074
Short-term investments	1,485,438	1,082,956
Accounts receivable, net	425,468	459,406
Inventories	299,108	245,448
Prepaid expenses and other current assets	69,336	66,945
Deferred income taxes	10,818	10,818
Total current assets	3,072,569	3,712,647
Property and equipment, net	354,483	358,440
Long-term investments	26,070	26,226
Goodwill	2,006,473	2,004,833
Acquired intangible assets, net	123,869	124,631
Other non-current assets	109,143	111,380
Total assets	5,692,607	6,338,157
Current liabilities:
Accounts payable	321,687	332,007
Accrued liabilities	79,193	85,994
Accrued employee compensation	131,644	146,524
Deferred income	80,890	76,161
Total current liabilities	613,414	640,686
Non-current income taxes payable	138,767	136,262
Other long-term liabilities	37,022	39,340
Total liabilities	789,203	816,288
Commitments and contingencies (Note 9)
Shareholders' equity:
Common stock	1,218	1,317
Additional paid-in capital	4,034,873	4,805,588
Accumulated other comprehensive income	6,580	1,092
Retained earnings	860,733	713,872
Total shareholders' equity	4,903,404	5,521,869
Total liabilities and shareholders' equity	$ 5,692,607	$ 6,338,157

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Net revenue	$ 802,402	$ 855,579
Operating costs and expenses:
Cost of goods sold	334,475	343,985
Research and development	242,537	219,111
Selling and marketing	38,152	38,423
General and administrative	24,784	23,108
Amortization of acquired intangible assets	14,341	22,549
Total operating costs and expenses	654,289	647,176
Operating income	148,113	208,403
Interest and other income (expense), net	(27)	(3,701)
Interest expense	(191)	(51)
Income before income taxes	147,895	204,651
Provision (benefit) for income taxes	1,034	(1,116)
Net income	$ 146,861	$ 205,767
Net income per share:
Basic	$ 0.23	$ 0.32
Diluted	$ 0.22	$ 0.30
Weighted average shares:
Basic	638,946	640,926
Diluted	657,140	678,059

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Cash flows from operating activities:
Net income	$ 146,861	$ 205,767
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,037	23,078
Stock-based compensation	27,480	26,896
Amortization of acquired intangible assets	14,341	22,549
Other (income) expense, net	3,854	2,035
Fair market value adjustment to acquired inventory sold		(942)
Excess tax benefits from stock-based compensation	(3)	(185)
Changes in assets and liabilities:
Accounts receivable	33,938	(91,897)
Inventories	(53,107)	35,417
Prepaid expenses and other assets	644	10,381
Accounts payable	(5,295)	6,703
Accrued liabilities and other	(5,450)	2,362
Accrued employee compensation	(14,880)	(10,506)
Deferred income	4,729	23,933
Net cash provided by operating activities	177,149	255,591
Cash flows from investing activities:
Purchases of marketable securities	(677,179)	(186,878)
Purchases of strategic investments	(1,750)	(1,000)
Sales and maturities of investments	272,547	149,440
Cash paid for acquisition, net	(16,330)
Purchases of technology licenses	(3,290)	(2,250)
Purchases of property and equipment	(17,018)	(16,395)
Net cash used in investing activities	(443,020)	(57,083)
Cash flows from financing activities:
Repurchase of common stock	(803,501)
Proceeds from employee stock plans	5,207	48,688
Principal payments on capital lease obligations	(511)	(470)
Excess tax benefits from stock-based compensation	3	185
Net cash provided by (used in) financing activities	(798,802)	48,403
Net increase (decrease) in cash and cash equivalents	(1,064,673)	246,911
Cash and cash equivalents at beginning of period	1,847,074	1,105,428
Cash and cash equivalents at end of period	$ 782,401	$ 1,352,339

The Company and Basis of Presentation

3 Months Ended

Apr. 30, 2011

The Company and Basis of Presentation

Note 1. The Company and Basis of Presentation

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 (“PHY”), 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 2012 and fiscal 2011 are comprised of 52-week periods.

The unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for annual financial statements. In the opinion of management, all adjustments consisting of normal and recurring entries considered necessary for a fair statement of the results for the interim periods have been included in the Company’s financial position as of April 30, 2011, the results of its operations for the three months ended April 30, 2011 and May 1, 2010, and its cash flows for the three months ended April 30, 2011 and May 1, 2010. The January 29, 2011 condensed consolidated balance sheet data was derived from audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended January 29, 2011 but does not include all disclosures required for annual periods. Certain reclassifications have been made to conform to the current period’s presentation.

These condensed consolidated financial statements and related notes are unaudited and should be read in conjunction with the Company’s audited financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended January 29, 2011 as filed on March 28, 2011 with the Securities and Exchange Commission. The results of operations for the three months ended April 30, 2011 are not necessarily indicative of the results that may be expected for any other interim period or for the full fiscal year.

Use of estimates

The preparation of consolidated financial statements in conformity with 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, including 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 unaudited condensed 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.

Recent Accounting Pronouncements and Accounting Changes

3 Months Ended

Apr. 30, 2011

Recent Accounting Pronouncements and Accounting Changes

Note 2. Recent Accounting Pronouncements and Accounting Changes

During the three months ended April 30, 2011, there were no new accounting pronouncements that would have had a material effect on our unaudited condensed consolidated financial statements. For a description of recent accounting pronouncements relevant to the Company, please refer to the “Recent Accounting Pronouncements” section included in Note 1 of our Annual Report on Form 10-K for the year ended January 29, 2011.

- Definition

The entire disclosure for reporting accounting changes and error corrections. It includes the conveyance of information necessary for a user of the Company's financial information to understand all aspects and required disclosure information concerning all changes and error corrections reported in the Company's financial statements for the period.

+ References + Details

Investments

3 Months Ended

Apr. 30, 2011

Investments

Note 3. Investments

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


	As o f April 30, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	857,449	$	3,856	$	(90	)	$	861,215
U.S. government and agencies		622,881		1,358		(16	)		624,223

Total short-term investments	$	1,480,330	$	5,214	$	(106	)	$	1,485,438

Long-term investments:
Available-for-sale:
Auction rate securities	$	27,750	$	—	$	(1,680	)	$	26,070

Total long-term investments	$	27,750	$	—	$	(1,680	)	$	26,070

Total investments	$	1,508,080	$	5,214	$	(1,786	)	$	1,511,508


	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. government and agencies		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

As of April 30, 2011, the Company’s investment portfolio included $27.8 million in par value of auction rate securities. Beginning in February 2008, liquidity issues in the global credit markets resulted in a failure of auction rate securities, as the amount of securities submitted for sale in those auctions exceeded the amount of bids. To estimate the fair value of the auction rate securities since that time, the Company used a discounted cash flow model based on estimated timing and amount of future interest and principal payments, credit quality of the underlying securities and liquidity considerations, the collateralization of underlying security investments, the credit worthiness of the issuer of the securities, the probability of full repayment and other considerations. As of April 30, 2011, the fair value of auction rate securities was $1.7 million less than par value and was recorded in long-term investments.

Based on the Company’s assessment of its cash flow projections, a balance of approximately $2.3 billion in cash, cash equivalents and short-term investments other than auction rate securities and the fact that the Company continues to generate positive cash flow on a quarterly basis, the Company does not anticipate having to sell these securities below par value in order to operate its business. The Company 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 April 30, 2011 and January 29, 2011 are presented in the following table (in thousands):


	April 30, 2011				January 29, 2011
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	717,314	$	718,531	$	560,190	$	560,999
Due between one and five years		763,017		766,907		519,262		521,957
Due over five years		27,750		26,070		27,850		26,226

	$	1,508,081	$	1,511,508	$	1,107,302	$	1,109,182

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


	April 30, 2011
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	109,741	$	(90	)	$	—	$	—		$	109,741	$	(90	)
U.S. government and agencies		23,219		(16	)		—		—			23,219		(16	)
Auction rate securities		—		—			26,070		(1,680	)		26,070		(1,680	)

Total securities	$	132,960	$	(106	)	$	26,070	$	(1,680	)	$	159,030	$	(1,786	)


	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. government and agencies		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)

3 Months Ended

Apr. 30, 2011

Supplemental Financial Information (in thousands)

Note 4. Supplemental Financial Information (in thousands)

Inventories


	April 30, 2011		January 29, 2011
Work-in-process	$	199,086	$	156,108
Finished goods		100,022		89,340

Inventories	$	299,108	$	245,448

Property and equipment, net


	April 30, 2011			January 29, 2011
Machinery and equipment	$	448,372		$	435,900
Computer software		76,177			74,966
Furniture and fixtures		23,640			23,498
Leasehold improvements		34,617			34,142
Buildings		144,596			144,596
Building improvements		41,229			41,200
Land		69,246			69,246
Construction in progress		7,190			8,469

		845,067			832,017
Less: Accumulated depreciation and amortization		(490,584	)		(473,577	)

Property and equipment, net	$	354,483		$	358,440

Other non-current assets


	April 30, 2011		January 29, 2011
Technology licenses	$	47,734	$	51,642
Deferred tax assets		27,943		27,671
Deferred compensation		5,459		6,169
Prepayments for foundry capacity		5,289		5,289
Severance fund		5,347		4,819
Equity investments in privately held companies		5,700		3,950
Other		11,671		11,840

Other non-current assets	$	109,143	$	111,380

Accrued liabilities


	April 30, 2011		January 29, 2011
Accrued rebates	$	22,701	$	32,405
Accrued royalties		15,228		14,018
Accrued legal and professional services		9,603		10,676
Customer advances		3,150		3,515
Technology license obligation		8,850		4,850
Accrued sales/goods and services tax		2,518		3,679
Other		17,143		16,851

Accrued liabilities	$	79,193	$	85,994

Other long-term liabilities


	April 30, 2011		January 29, 2011
Accrued severance	$	3,666	$	3,226
Facilities consolidation		2,729		3,271
Technology license obligation		13,865		19,218
Long-term accrued employee compensation		8,548		9,258
Other		8,214		4,367

Other long-term liabilities	$	37,022	$	39,340

Net income per share

The Company reports both basic net income per share, which is based upon the weighted average number of common shares outstanding and diluted net income per share, which is based on the weighted average number of common shares outstanding and dilutive potential common shares. The computations of basic and diluted net income per share are presented in the following table (in thousands, except per share amounts):


	Three Months Ended
	April 30, 2011		May 1, 2010
Numerator:
Net income	$	146,861	$	205,767

Denominator:
Weighted average common shares outstanding		638,946		640,926
Effect of dilutive securities:
Common share options and other		18,194		37,133

Weighted average shares — diluted		657,140		678,059

Net income per share:
Basic	$	0.23	$	0.32
Diluted	$	0.22	$	0.30

Options to purchase 13.2 million common shares at a weighted average exercise price of $20.83 have been excluded from the computation of diluted net income per share for the three months ended April 30, 2011 because including them would have been anti-dilutive. In addition, the options granted during the three months ended April 30, 2011, which contain a market condition for vesting, have been excluded from the computation of diluted net income per share, as the market value of our shares as of April 30, 2011 was lower than the required market condition. Refer to “Note 11 – Stock-Based Compensation” for additional details.

Options to purchase 9.2 million common shares at a weighted average exercise price of $22.63 have been excluded from the computation of diluted net income per share for the three months ended May 1, 2010 because including them would have been anti-dilutive.

Comprehensive income

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


	Three Months Ended
	April 30, 2011			May 1, 2010
Net income	$	146,861		$	205,767
Other comprehensive income
Change in unrealized gain on marketable securities		1,604			122
Change in unrealized loss on auction rate securities		(56	)		4
Change in unrealized gain (loss) on cash flow hedges		3,940			199
Change in other		—			—

Total comprehensive income	$	152,349		$	206,092

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


	April 30, 2011			January 29, 2011
Unrealized gain on marketable securities	$	5,108		$	3,504
Unrealized loss on auction rate securities		(1,680	)		(1,624	)
Unrealized gain (loss) on cash flow hedges		3,147			(793	)
Other		5			5

Accumulated other comprehensive income	$	6,580		$	1,092

Derivative Financial Instruments

3 Months Ended

Apr. 30, 2011

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 from operating activities. The Company uses quoted prices to value its derivative instruments.

As of April 30, 2011 and January 29, 2011, the notional amounts of outstanding forward contracts were as follows (in thousands):


	April 30, 2011				January 29, 2011
	Buy Contracts		Sell Contracts		Buy Contracts		Sell Contracts
Israeli shekel	$	46,434	$	—	$	56,360	$	—
Euro		—		3,853		—		3,698

	$	46,434	$	3,853	$	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, net.

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 expense, net.

The fair value of foreign exchange contract derivatives were 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
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-Subparagraph (SX 210.4-08.(n))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708773-113959

Reference 22: 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

+ Details

Fair Value Measurements

3 Months Ended

Apr. 30, 2011

Fair Value Measurements

Note 6. Fair Value Measurements

Fair value is an exit price representing the amount that would be received to sell 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. 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 0.5% of total assets as of April 30, 2011.

The tables below set forth, by level, the Company’s financial assets that were accounted for at fair value as of April 30, 2011 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 April 30, 2011
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	356,357	$	—	$	—	$	356,357
U.S. government and agencies		19,999		—		—		19,999
Corporate debt securities		—		56,688		—		56,688
Time deposit		121,926		—		—		121,926
Short-term investments:
U.S. government and agencies		624,223				—		624,223
Corporate debt securities		—		861,215		—		861,215
Long-term investments:
Auction rate securities		—		—		26,070		26,070
Prepaid expenses and other current assets:
Forward contracts		—		2,959		—		2,959
Other non-current assets:
Severance pay fund		2,615		2,732		—		5,347

Total assets	$	1,125,120	$	923,594	$	26,070	$	2,074,784

Liabilities
Accrued liabilities:
Forward contracts	$	—	$	97	$	—	$	97

Total liabilities	$	—	$	97	$	—	$	97


	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
U.S. government and agencies		106,487		—		—		106,487
Corporate debt securities		—		9,797		—		9,797
Time deposit		159,938		—		—		159,938
Short-term investments:
U.S. 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	$	1,931,149	$	663,630	$	26,226	$	2,621,005

Liabilities
Accrued liabilities:
Forward contracts	$	—	$	804	$	—	$	804

Total liabilities	$	—	$	804	$	—	$	804

The following tables summarize the change in fair value for Level 3 items during the three months ended April 30, 2011 and May 1, 2010 (in thousands):


	Level 3
Changes in fair value during the three months ended April 30, 2011 (pre-tax):
Beginning balance at January 30, 2011	$	26,226
Purchases		—
Sales and redemption		(100	)
Unrealized loss included in other comprehensive income		(56	)

Ending balance at April 30, 2011	$	26,070


	Level 3
Changes in fair value during the three months ended May 1, 2010 (pre-tax):
Beginning balance at January 31, 2010	$	39,281
Purchases		—
Sales and redemption		(50	)
Unrealized gain included in other comprehensive loss		4

Ending balance at May 1, 2010	$	39,235

Assets measured and recorded at fair value on a non-recurring basis as of April 30, 2011 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13504-108611

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Goodwill and Acquired Intangible Assets, Net (in thousands):

3 Months Ended

Apr. 30, 2011

Goodwill and Acquired Intangible Assets, Net (in thousands):

Note 7. Goodwill and Acquired Intangible Assets, Net (in thousands):

Goodwill

The following table summarizes the activity related to the carrying value of goodwill:


Balance at January 29, 2011	$	2,004,833
Additions due to business combinations		1,640

Balance at April 30, 2011	$	2,006,473

Acquired Intangible Assets, Net


	Range of Useful Lives		April 30, 2011							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	$	739,605	$	(701,863	)	$	37,742	$	726,040	$	(698,877	)	$	27,163
Core technology		1 -8 years		212,650		(161,665	)		50,985		212,650		(155,359	)		57,291
Trade name		1 -5 years		350		(309	)		41		350		(299	)		51
Customer contracts		4 -7 years		187,200		(161,799	)		25,401		187,200		(156,774	)		30,426
In-process research and development		*		9,700		—			9,700		9,700		—			9,700

Total intangible assets, net			$	1,149,505	$	(1,025,636	)	$	123,869	$	1,135,940	$	(1,011,309	)	$	124,631

Upon completion of the project, the related in-process research and development (“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.

During the three months ended April 30, 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 preliminarily allocated to tangible and intangible assets based on their fair values as of the date of the completion of the purchase.

Based on the identified intangible assets recorded at April 30, 2011, the future amortization expense excluding IPR&D for the next five fiscal years is as follows (in thousands):


Fiscal year
Remainder of fiscal 2012	$	33,418
2013		41,436
2014		26,753
2015		5,351
2016		2,587
Thereafter		4,624

	$	114,169

- 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

3 Months Ended

Apr. 30, 2011

Restructuring

Note 8. Restructuring

During the three months ended April 30, 2011, the Company continued to make payments and incur on-going operating expenses from its previously vacated facilities. During the three months ended May 1, 2010, the Company subleased one of its previously vacated facilities and thus recorded an adjustment to the restructuring liabilities.

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


	Three Months Ended
	April 30, 2011			May 1, 2010
Restructuring liabilities, beginning of period	$	3,306		$	5,397
Facilities and related charges		619			687
Non-cash adjustment		12			(318	)
Net cash payments		(512	)		(701	)
Adjustments to previous assumptions		—			(101	)

Restructuring liabilities, end of period	$	3,425		$	4,964

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


	Three Months Ended
	April 30, 2011		May 1, 2010
Research and development	$	168	$	129
Selling and marketing		—		—
General and administrative		451		457

	$	619	$	586

The remaining facility lease charges included in the 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

Commitments and Contingencies

3 Months Ended

Apr. 30, 2011

Commitments and Contingencies

Note 9. Commitments and Contingencies

Purchase commitments

Under the Company’s manufacturing relationships with its foundry partners, cancellation of all outstanding purchase orders are allowed but require repayment of all expenses incurred through the date of cancellation. As of April 30, 2011, the total value of open purchase orders with these foundries were approximately $290.3 million.

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 claim 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 seeks unspecified damages, interest and fees. In addition, this case has been 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 have reached a global settlement of the coordinated litigation. Under the settlement, the insurers will pay the full amount of settlement share allocated to the Company, and the Company will bear no financial liability. The Company and other defendants will receive complete dismissals from the case. In 2009, the Court issued an order of final approval of the settlement. Certain objectors filed appeals. A number of those appeals have been dismissed. In May 2011, the appellate court issued an order remanding the remaining appeals to district court for determination of certain matters. If for any reason the settlement does not become effective, the Company believes it has meritorious defenses to the claims against it and intends to defend the action vigorously.

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. If either petition is granted, it will take at least six months for the Supreme Court to process the case. If the petitions are both denied, the case will be remanded to the district court for further proceedings.

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, later denied in written orders, Jasmine filed a notice of appeal in March 2011 and MSI intends to contest any such appeal vigorously. The Company does not believe, based on currently available facts and circumstances, that it is reasonably possible to predict the final outcome of this case and, as such, the Company has not accrued for any amount as of April 30, 2011.

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 disputes all of plaintiff’s class claims, and intends to defend this matter vigorously. The matter has been set for trial on September 26, 2011.

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 hard disk drive 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. Two hearings on this matter were held on March 31, 2011 and May 17, 2011, respectively. The Court has not yet scheduled a trial date. MSI and the Company believe that they do not infringe any valid and enforceable claims of the asserted CMU patents and intend to contest this action vigorously.

Xpoint Patent Litigation. On August 21, 2009, Xpoint Technologies, Inc. filed a complaint in the United States District of Delaware, which names the Company, MSI and thirty-six other companies as defendants. The complaint alleged infringement of U.S. Patent No. 5,913,028 which purportedly relates to data traffic delivery. The complaint seeks unspecified damages and an injunction. A first amended complaint was filed on September 18, 2009 and a second amended complaint was filed on August 20, 2010. On October 28, 2009, the Company was dismissed from the lawsuit. On April 20, 2011, MSI was dismissed from the lawsuit.

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. A technology tutorial hearing was held on February 25, 2010. A claim construction hearing is scheduled for October 28, 2011. 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.

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 United States Patent Nos. 5,844,738 and 5,978,162 (collectively, the “Lake Cherokee patents in suit”). The Lake Cherokee patents in suit are purportedly relating to read-channel integrated circuit devices, and allegedly, to certain unspecified hard disk drive 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. The initial scheduling conference was held on February 16, 2011. Defendants filed a motion to transfer on April 1, 2011. 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 intends to vigorously defend this action.

APT Patent Litigation. On January 18, 2011, Advanced Processor Technologies LLC (“APT”) 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 United States 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. MSI intends to vigorously defend this action.

LAMD Patent Litigations. On October 11, 2010, Marvell International Ltd. 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 United States Patent Nos. 7,328,395, 7,751,138, 7,099,411 and 7,228,485. The complaint seeks unspecified damages and a permanent injunction. A claim construction hearing is scheduled for May 25, 2012, and trial is set for July 23, 2012.

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 United States Patent No. 7,590,927. The complaint seeks unspecified damages and a permanent injunction. MSI filed its answer and counterclaims on May 3, 2011. MSI believes that it does not infringe any valid and enforceable claim of the LAMD patent in suit. MSI intends to litigate both actions vigorously.

MOSAID Litigation. On March 16, 2011, MOSAID Technologies Inc. filed suit in the Eastern District of Texas against MSI and 16 other companies. The suit alleges that the 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 intends to vigorously defend this action.

Azure Networks Litigation. On March 22, 2011, Azure Networks LLC. 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 intends to vigorously defend this action.

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 these proceedings and claims cannot currently be ascertained, except as otherwise indicated above, an unfavorable outcome in such actions could have a material adverse effect on the Company’s cash flows. For the matters that have not reached a settlement, the Company is unable to estimate a possible loss, or range of loss, with respect to the above mentioned legal matters. 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, which could adversely impact gross margins in future periods, or 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. 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

Shareholders' Equity

3 Months Ended

Apr. 30, 2011

Shareholders' Equity

Note 10. Shareholders’ Equity

Stock plans

During the three months ended April 30, 2011, the Company granted stock options with a market price 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.

Activity under the Company’s stock option plans for the three months ended April 30, 2011 is summarized below (in thousands, except 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 29, 2011		56,325		$	11.96		—	$	—		56,325		$	11.96
Granted		2,499		$	15.55		3,149	$	15.43		5,648		$	15.48
Canceled/Forfeited		(414	)	$	14.67		—	$	—		(414	)	$	14.67
Exercised or issued		(1,232	)	$	7.99		—	$	—		(1,232	)	$	7.99

Balance at April 30, 2011		57,178		$	12.18		3,149	$	15.43		60,327		$	12.35

Vested or expected to vest at April 30, 2011		55,804		$	12.17		2,964	$	15.43		58,768		$	12.33

Exercisable at April 30, 2011		43,411		$	12.34		—	$	—		43,411		$	12.34

The aggregate intrinsic value and weighted average remaining contractual term of time-based stock options vested and expected to vest at April 30, 2011 was $254.2 million and 5.0 years, respectively.

The aggregate intrinsic value and weighted average remaining contractual term of market-based stock options vested and expected to vest at April 30, 2011 was $0 and 9.9 years, respectively.

The aggregate intrinsic value is calculated based on the Company’s closing share price as reported on the NASDAQ Global Select Market for all in-the-money options as of April 29, 2011.

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 2.2 years and 2.7 years, respectively.

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


	Restricted Stock Units Outstanding			Weighted Average Grant Date Fair Value
Balance at January 29, 2011		5,486		$	18.75
Granted		5,573		$	16.08
Vested		(1,153	)	$	20.17
Canceled/Forfeited		(122	)	$	17.67

Balance at April 30, 2011		9,784		$	17.09

As of April 30, 2011, compensation costs related to stock options and restricted stock units not yet recognized amounted to $217.2 million. 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 2.0 years. Historically, the Company issued new shares to satisfy stock option exercises.

Employee stock purchase plan

In June 2000, the Company adopted the 2000 Employee Stock Purchase Plan (the “Purchase Plan”), and on October 22, 2009, the Purchase Plan was amended and restated (the “Restated Purchase Plan”). The Restated Purchase Plan had 23.2 million common shares reserved for issuance thereunder as of April 30, 2011.

The Company issued no shares under the Restated Purchase Plan in the three months ended April 30, 2011. As of April 30, 2011, there was $1.8 million of unrecognized compensation cost related to the Restated Purchase Plan.

Stock Repurchase Program

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. In March 2011, the Company announced that its Board of Directors has authorized the Company to repurchase up to an additional $500 million, for a total of $1 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 Company repurchased 50.3 million shares for $803.5 million in cash during the three months ended April 30, 2011. The repurchased shares were retired immediately after the repurchases were completed. As of April 30, 2011, $109 million remained available under this stock repurchase program.

- 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
-Publisher FASB
-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
-Topic 505
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-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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 4
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 17: 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.(d),(e))
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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
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

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
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

+ Details

Stock-Based Compensation

3 Months Ended

Apr. 30, 2011

Stock-Based Compensation

Note 11. Stock-Based Compensation

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


	Three Months Ended
	April 30, 2011		May 1, 2010
Cost of goods sold	$	1,695	$	2,236
Research and development		19,593		18,851
Selling and marketing		2,654		3,173
General and administrative		3,538		2,636

	$	27,480	$	26,896

Stock-based compensation of $1.5 million was capitalized in inventory as of April 30, 2011 and January 29, 2011.

Time-based Vesting

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:


	Three Months Ended
	April 30, 2011			May 1, 2010
Estimated fair value	$	6.06		$	9.65
Volatility		42	%		53	%
Expected term (in years)		4.8			4.7
Risk-free interest rate		2.2	%		2.2	%
Dividend yield		—			—

The expected volatility for awards granted during the three months ended April 30, 2011 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.

Market-based Vesting

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 following 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.


	Three Months Ended
	April 30, 2011
Estimated fair value	$	5.08
Expected volatility		42	%
Risk-free interest rate		0.85 - 3.59	%
Dividend yield		—

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-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 Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-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 SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Income Taxes

3 Months Ended

Apr. 30, 2011

Income Taxes

Note 12. Income Taxes

For the three months ended April 30, 2011 and May 1, 2010, the Company’s effective tax rate was an income tax provision of 0.7% and an income tax benefit of 0.5%, respectively. The income tax provision for these periods was affected by non-tax-deductible expenses such as stock-based compensation expense and the amortization of acquired intangibles. For the three months ended April 30, 2011, the provision for income taxes consisted of the current year income tax liability of $3.4 million, a reduction of unrecognized tax benefits in the amount $4.3 million due to the expiration of the statute of limitations in multiple jurisdictions, and increases in unrecognized tax benefits of $1.9 million. During the three months ended May 1, 2010 the benefit for income taxes was impacted by the current year income tax liability of $3.2 million, a reduction of unrecognized tax benefits in the amount $6.5 million due to the expiration of the statute of limitations in multiple jurisdictions, and increases in unrecognized tax benefits of $2.2 million dollars. During the next 12 months, its 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, an amount cannot be reasonably estimated as the Company will have negotiations with various tax authorities throughout the year.

- 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
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-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

The Company and Basis of Presentation (Policies)	3 Months Ended
The Company and Basis of Presentation (Policies)	Apr. 30, 2011
The Company	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 (“PHY”), 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	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 2012 and fiscal 2011 are comprised of 52-week periods. The unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for annual financial statements. In the opinion of management, all adjustments consisting of normal and recurring entries considered necessary for a fair statement of the results for the interim periods have been included in the Company’s financial position as of April 30, 2011, the results of its operations for the three months ended April 30, 2011 and May 1, 2010, and its cash flows for the three months ended April 30, 2011 and May 1, 2010. The January 29, 2011 condensed consolidated balance sheet data was derived from audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended January 29, 2011 but does not include all disclosures required for annual periods. Certain reclassifications have been made to conform to the current period’s presentation. These condensed consolidated financial statements and related notes are unaudited and should be read in conjunction with the Company’s audited financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended January 29, 2011 as filed on March 28, 2011 with the Securities and Exchange Commission. The results of operations for the three months ended April 30, 2011 are not necessarily indicative of the results that may be expected for any other interim period or for the full fiscal year.
Use of estimates	Use of estimates The preparation of consolidated financial statements in conformity with 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, including 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	Principles of consolidation The unaudited condensed 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.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-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 AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-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 Interpretation (FIN)
-Number 46R
-Paragraph 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 5, 6, 16-19
-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 AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 20
-Subparagraph a(2)
-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 Emerging Issues Task Force (EITF)
-Number 96-16
-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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 97-2
-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
-Article 3A
-Section 02, 03

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph k
-Article 1

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
-Paragraph 4
-Subparagraph c
-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 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
-Paragraph 4
-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 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-URI http://asc.fasb.org/section&trid=2197723

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6921930&loc=d3e5614-111684

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Paragraph 2
-Subparagraph (SX 210.3A-02)
-URI http://asc.fasb.org/extlink&oid=6959686&loc=d3e355033-122828

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 323
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33801-111570

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-URI http://asc.fasb.org/subtopic&trid=2197087

+ Details

Investments (Tables)

3 Months Ended

Apr. 30, 2011

Schedule of Available-for-sale Securities Reconciliation

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


	As o f April 30, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	857,449	$	3,856	$	(90	)	$	861,215
U.S. government and agencies		622,881		1,358		(16	)		624,223

Total short-term investments	$	1,480,330	$	5,214	$	(106	)	$	1,485,438

Long-term investments:
Available-for-sale:
Auction rate securities	$	27,750	$	—	$	(1,680	)	$	26,070

Total long-term investments	$	27,750	$	—	$	(1,680	)	$	26,070

Total investments	$	1,508,080	$	5,214	$	(1,786	)	$	1,511,508


	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. government and agencies		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 April 30, 2011 and January 29, 2011 are presented in the following table (in thousands):


	April 30, 2011				January 29, 2011
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	717,314	$	718,531	$	560,190	$	560,999
Due between one and five years		763,017		766,907		519,262		521,957
Due over five years		27,750		26,070		27,850		26,226

	$	1,508,081	$	1,511,508	$	1,107,302	$	1,109,182

Unrealized Loss Position Investments


	April 30, 2011
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	109,741	$	(90	)	$	—	$	—		$	109,741	$	(90	)
U.S. government and agencies		23,219		(16	)		—		—			23,219		(16	)
Auction rate securities		—		—			26,070		(1,680	)		26,070		(1,680	)

Total securities	$	132,960	$	(106	)	$	26,070	$	(1,680	)	$	159,030	$	(1,786	)


	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. government and agencies		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)

3 Months Ended

Apr. 30, 2011

Schedule of Inventory, Current

Inventories


	April 30, 2011		January 29, 2011
Work-in-process	$	199,086	$	156,108
Finished goods		100,022		89,340

Inventories	$	299,108	$	245,448

Property, Plant and Equipment

Property and equipment, net


	April 30, 2011			January 29, 2011
Machinery and equipment	$	448,372		$	435,900
Computer software		76,177			74,966
Furniture and fixtures		23,640			23,498
Leasehold improvements		34,617			34,142
Buildings		144,596			144,596
Building improvements		41,229			41,200
Land		69,246			69,246
Construction in progress		7,190			8,469

		845,067			832,017
Less: Accumulated depreciation and amortization		(490,584	)		(473,577	)

Property and equipment, net	$	354,483		$	358,440

Schedule of Other Assets, Noncurrent

Other non-current assets


	April 30, 2011		January 29, 2011
Technology licenses	$	47,734	$	51,642
Deferred tax assets		27,943		27,671
Deferred compensation		5,459		6,169
Prepayments for foundry capacity		5,289		5,289
Severance fund		5,347		4,819
Equity investments in privately held companies		5,700		3,950
Other		11,671		11,840

Other non-current assets	$	109,143	$	111,380

Schedule of Accrued Liabilities

Accrued liabilities


	April 30, 2011		January 29, 2011
Accrued rebates	$	22,701	$	32,405
Accrued royalties		15,228		14,018
Accrued legal and professional services		9,603		10,676
Customer advances		3,150		3,515
Technology license obligation		8,850		4,850
Accrued sales/goods and services tax		2,518		3,679
Other		17,143		16,851

Accrued liabilities	$	79,193	$	85,994

Other Noncurrent Liabilities

Other long-term liabilities


	April 30, 2011		January 29, 2011
Accrued severance	$	3,666	$	3,226
Facilities consolidation		2,729		3,271
Technology license obligation		13,865		19,218
Long-term accrued employee compensation		8,548		9,258
Other		8,214		4,367

Other long-term liabilities	$	37,022	$	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):


	Three Months Ended
	April 30, 2011		May 1, 2010
Numerator:
Net income	$	146,861	$	205,767

Denominator:
Weighted average common shares outstanding		638,946		640,926
Effect of dilutive securities:
Common share options and other		18,194		37,133

Weighted average shares — diluted		657,140		678,059

Net income per share:
Basic	$	0.23	$	0.32
Diluted	$	0.22	$	0.30

Schedule of Comprehensive Income (Loss)

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


	Three Months Ended
	April 30, 2011			May 1, 2010
Net income	$	146,861		$	205,767
Other comprehensive income
Change in unrealized gain on marketable securities		1,604			122
Change in unrealized loss on auction rate securities		(56	)		4
Change in unrealized gain (loss) on cash flow hedges		3,940			199
Change in other		—			—

Total comprehensive income	$	152,349		$	206,092

Schedule of Accumulated Other Comprehensive Income (Loss)

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


	April 30, 2011			January 29, 2011
Unrealized gain on marketable securities	$	5,108		$	3,504
Unrealized loss on auction rate securities		(1,680	)		(1,624	)
Unrealized gain (loss) on cash flow hedges		3,147			(793	)
Other		5			5

Accumulated other comprehensive income	$	6,580		$	1,092

Derivative Financial Instruments (Tables)

3 Months Ended

Apr. 30, 2011

Schedule of Derivative Instruments

As of April 30, 2011 and January 29, 2011, the notional amounts of outstanding forward contracts were as follows (in thousands):


	April 30, 2011				January 29, 2011
	Buy Contracts		Sell Contracts		Buy Contracts		Sell Contracts
Israeli shekel	$	46,434	$	—	$	56,360	$	—
Euro		—		3,853		—		3,698

	$	46,434	$	3,853	$	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
-Paragraph 8
-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
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41638-113959

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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-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579240-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41641-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41620-113959

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)

3 Months Ended

Apr. 30, 2011

Fair Value, Assets Measured on Recurring Basis

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 April 30, 2011
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	356,357	$	—	$	—	$	356,357
U.S. government and agencies		19,999		—		—		19,999
Corporate debt securities		—		56,688		—		56,688
Time deposit		121,926		—		—		121,926
Short-term investments:
U.S. government and agencies		624,223				—		624,223
Corporate debt securities		—		861,215		—		861,215
Long-term investments:
Auction rate securities		—		—		26,070		26,070
Prepaid expenses and other current assets:
Forward contracts		—		2,959		—		2,959
Other non-current assets:
Severance pay fund		2,615		2,732		—		5,347

Total assets	$	1,125,120	$	923,594	$	26,070	$	2,074,784

Liabilities
Accrued liabilities:
Forward contracts	$	—	$	97	$	—	$	97

Total liabilities	$	—	$	97	$	—	$	97


	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
U.S. government and agencies		106,487		—		—		106,487
Corporate debt securities		—		9,797		—		9,797
Time deposit		159,938		—		—		159,938
Short-term investments:
U.S. 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	$	1,931,149	$	663,630	$	26,226	$	2,621,005

Liabilities
Accrued liabilities:
Forward contracts	$	—	$	804	$	—	$	804

Total liabilities	$	—	$	804	$	—	$	804

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

The following tables summarize the change in fair value for Level 3 items during the three months ended April 30, 2011 and May 1, 2010 (in thousands):


	Level 3
Changes in fair value during the three months ended April 30, 2011 (pre-tax):
Beginning balance at January 30, 2011	$	26,226
Purchases		—
Sales and redemption		(100	)
Unrealized loss included in other comprehensive income		(56	)

Ending balance at April 30, 2011	$	26,070


	Level 3
Changes in fair value during the three months ended May 1, 2010 (pre-tax):
Beginning balance at January 31, 2010	$	39,281
Purchases		—
Sales and redemption		(50	)
Unrealized gain included in other comprehensive loss		4

Ending balance at May 1, 2010	$	39,235

- 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, Net (in thousands): (Tables)

3 Months Ended

Apr. 30, 2011

Schedule of Goodwill

The following table summarizes the activity related to the carrying value of goodwill:


Balance at January 29, 2011	$	2,004,833
Additions due to business combinations		1,640

Balance at April 30, 2011	$	2,006,473

Schedule of Finite-Lived Intangible Assets by Major Class

Acquired Intangible Assets, Net


	Range of Useful Lives		April 30, 2011							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	$	739,605	$	(701,863	)	$	37,742	$	726,040	$	(698,877	)	$	27,163
Core technology		1 -8 years		212,650		(161,665	)		50,985		212,650		(155,359	)		57,291
Trade name		1 -5 years		350		(309	)		41		350		(299	)		51
Customer contracts		4 -7 years		187,200		(161,799	)		25,401		187,200		(156,774	)		30,426
In-process research and development		*		9,700		—			9,700		9,700		—			9,700

Total intangible assets, net			$	1,149,505	$	(1,025,636	)	$	123,869	$	1,135,940	$	(1,011,309	)	$	124,631

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Based on the identified intangible assets recorded at April 30, 2011, the future amortization expense excluding IPR&D for the next five fiscal years is as follows (in thousands):


Fiscal year
Remainder of fiscal 2012	$	33,418
2013		41,436
2014		26,753
2015		5,351
2016		2,587
Thereafter		4,624

	$	114,169

- 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)

3 Months Ended

Apr. 30, 2011

Schedule of Restructuring and Related Costs

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


	Three Months Ended
	April 30, 2011			May 1, 2010
Restructuring liabilities, beginning of period	$	3,306		$	5,397
Facilities and related charges		619			687
Non-cash adjustment		12			(318	)
Net cash payments		(512	)		(701	)
Adjustments to previous assumptions		—			(101	)

Restructuring liabilities, end of period	$	3,425		$	4,964

Schedule of Restructuring Reserve by Type of Cost

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


	Three Months Ended
	April 30, 2011		May 1, 2010
Research and development	$	168	$	129
Selling and marketing		—		—
General and administrative		451		457

	$	619	$	586

Shareholders' Equity (Tables)

3 Months Ended

Apr. 30, 2011

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

Activity under the Company’s stock option plans for the three months ended April 30, 2011 is summarized below (in thousands, except 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 29, 2011		56,325		$	11.96		—	$	—		56,325		$	11.96
Granted		2,499		$	15.55		3,149	$	15.43		5,648		$	15.48
Canceled/Forfeited		(414	)	$	14.67		—	$	—		(414	)	$	14.67
Exercised or issued		(1,232	)	$	7.99		—	$	—		(1,232	)	$	7.99

Balance at April 30, 2011		57,178		$	12.18		3,149	$	15.43		60,327		$	12.35

Vested or expected to vest at April 30, 2011		55,804		$	12.17		2,964	$	15.43		58,768		$	12.33

Exercisable at April 30, 2011		43,411		$	12.34		—	$	—		43,411		$	12.34

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 prices):


	Restricted Stock Units Outstanding			Weighted Average Grant Date Fair Value
Balance at January 29, 2011		5,486		$	18.75
Granted		5,573		$	16.08
Vested		(1,153	)	$	20.17
Canceled/Forfeited		(122	)	$	17.67

Balance at April 30, 2011		9,784		$	17.09

- 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

Stock-Based Compensation (Tables)

3 Months Ended

Apr. 30, 2011

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):


	Three Months Ended
	April 30, 2011		May 1, 2010
Cost of goods sold	$	1,695	$	2,236
Research and development		19,593		18,851
Selling and marketing		2,654		3,173
General and administrative		3,538		2,636

	$	27,480	$	26,896

Time Based Option Award

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


	Three Months Ended
	April 30, 2011			May 1, 2010
Estimated fair value	$	6.06		$	9.65
Volatility		42	%		53	%
Expected term (in years)		4.8			4.7
Risk-free interest rate		2.2	%		2.2	%
Dividend yield		—			—

Market Based Option Award

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


	Three Months Ended
	April 30, 2011
Estimated fair value	$	5.08
Expected volatility		42	%
Risk-free interest rate		0.85 - 3.59	%
Dividend yield		—

- 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

Summary of Investments (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 1,508,080	$ 1,107,302
Gross Unrealized Gains	5,214	3,769
Gross Unrealized Losses	(1,786)	(1,889)
Estimated Fair Value	1,511,508	1,109,182
Short-term Investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	1,480,330	1,079,452
Gross Unrealized Gains	5,214	3,769
Gross Unrealized Losses	(106)	(265)
Estimated Fair Value	1,485,438	1,082,956
Short-term Investments \| Available-for-sale \| Corporate debt securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	857,449	648,278
Gross Unrealized Gains	3,856	3,208
Gross Unrealized Losses	(90)	(213)
Estimated Fair Value	861,215	651,273
Short-term Investments \| Available-for-sale \| US government and agencies
Gain (Loss) on Investments [Line Items]
Amortized Cost	622,881	431,174
Gross Unrealized Gains	1,358	561
Gross Unrealized Losses	(16)	(52)
Estimated Fair Value	624,223	431,683
Long-term investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	27,750	27,850
Gross Unrealized Losses	(1,680)	(1,624)
Estimated Fair Value	26,070	26,226
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Gross Unrealized Losses	(1,700)
Long-term investments \| Available-for-sale \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	27,750	27,850
Gross Unrealized Losses	(1,680)	(1,624)
Estimated Fair Value	$ 26,070	$ 26,226

Investments - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Gain (Loss) on Investments [Line Items]
Decrease in fair value of auction rate securities	$ 1,786	$ 1,889
Cash, cash equivalents and short-term investments other than auction rate securities	2,300,000
Long-term investments
Gain (Loss) on Investments [Line Items]
Decrease in fair value of auction rate securities	1,680	$ 1,624
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Par value of auction rate securities	27,800
Decrease in fair value of auction rate securities	$ 1,700

Contractual Maturities of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Amortized Cost
Due in one year or less	$ 717,314	$ 560,190
Due between one and five years	763,017	519,262
Due over five years	27,750	27,850
Marketable Securities, Debt Maturities, Amortized Cost, Total	1,508,081	1,107,302
Estimated Fair Value
Due in one year or less	718,531	560,999
Due between one and five years	766,907	521,957
Due over five years	26,070	26,226
Estimated Fair Value	$ 1,511,508	$ 1,109,182

Summary of the Investments' Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 132,960	$ 205,043
Less than 12 months Unrealized Losses	(106)	(265)
12 months or more Fair Value	26,070	26,226
12 months or more Unrealized Losses	(1,680)	(1,624)
Total Fair Value	159,030	231,269
Total Unrealized Losses	(1,786)	(1,889)
Corporate debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	109,741	113,081
Less than 12 months Unrealized Losses	(90)	(213)
Total Fair Value	109,741	113,081
Total Unrealized Losses	(90)	(213)
U.S. government and agencies
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	23,219	91,962
Less than 12 months Unrealized Losses	(16)	(52)
Total Fair Value	23,219	91,962
Total Unrealized Losses	(16)	(52)
Auction rate securities
Investments, Unrealized Loss Position [Line Items]
12 months or more Fair Value	26,070	26,226
12 months or more Unrealized Losses	(1,680)	(1,624)
Total Fair Value	26,070	26,226
Total Unrealized Losses	$ (1,680)	$ (1,624)

Inventories (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Schedule of Inventory [Line Items]
Work-in-process	$ 199,086	$ 156,108
Finished goods	100,022	89,340
Inventories	$ 299,108	$ 245,448

Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Property, Plant and Equipment [Line Items]
Machinery and equipment	$ 448,372	$ 435,900
Computer software	76,177	74,966
Furniture and fixtures	23,640	23,498
Leasehold improvements	34,617	34,142
Buildings	144,596	144,596
Building improvements	41,229	41,200
Land	69,246	69,246
Construction in progress	7,190	8,469
Property, Plant and Equipment, Gross, Total	845,067	832,017
Less: Accumulated depreciation and amortization	(490,584)	(473,577)
Property and equipment, net	$ 354,483	$ 358,440

Other Non-Current Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Technology licenses	$ 47,734	$ 51,642
Deferred tax assets	27,943	27,671
Deferred compensation	5,459	6,169
Prepayments for foundry capacity	5,289	5,289
Severance fund	5,347	4,819
Equity investments in privately held companies	5,700	3,950
Other	11,671	11,840
Other non-current assets	$ 109,143	$ 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	Apr. 30, 2011	Jan. 29, 2011
Schedule of Accrued Liabilities [Line Items]
Accrued rebates	$ 22,701	$ 32,405
Accrued royalties	15,228	14,018
Accrued legal and professional services	9,603	10,676
Customer advances	3,150	3,515
Technology license obligation	8,850	4,850
Accrued sales/goods and services tax	2,518	3,679
Other	17,143	16,851
Accrued liabilities	$ 79,193	$ 85,994

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Other Liabilities [Line Items]
Accrued severance	$ 3,666	$ 3,226
Facilities consolidation	2,729	3,271
Technology license obligation	13,865	19,218
Long-term accrued employee compensation	8,548	9,258
Other	8,214	4,367
Other long-term liabilities	$ 37,022	$ 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
	Apr. 30, 2011	May 01, 2010
Numerator:
Net income	$ 146,861	$ 205,767
Denominator:
Weighted average common shares outstanding	638,946	640,926
Effect of dilutive securities:
Common share options and other	18,194	37,133
Weighted average shares - diluted	657,140	678,059
Net income per share:
Basic	$ 0.23	$ 0.32
Diluted	$ 0.22	$ 0.30

Supplemental Financial Information - Additional Information (Detail) - $ / shares shares in Millions	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive options excluded from the computation of diluted net income per share	13.2	9.2
Anti-dilutive options excluded from the computation of diluted net income per share, weighted average exercise price	$ 20.83	$ 22.63

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 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 FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-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 128
-Paragraph 40
-Subparagraph c
-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 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 8: 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

Changes in the Components of Other Comprehensive Income ("OCI") (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Net income	$ 146,861	$ 205,767
Other comprehensive income
Change in unrealized gain on marketable securities	1,604	122
Change in unrealized loss on auction rate securities	(56)	4
Change in unrealized gain (loss) on cash flow hedges	3,940	199
Change in other
Total comprehensive income	$ 152,349	$ 206,092

- 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
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

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	Apr. 30, 2011	Jan. 29, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain on marketable securities	$ 5,108	$ 3,504
Unrealized loss on auction rate securities	(1,680)	(1,624)
Unrealized gain (loss) on cash flow hedges	3,147	(793)
Other	5	5
Accumulated other comprehensive income	$ 6,580	$ 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	Apr. 30, 2011	Jan. 29, 2011
Derivative [Line Items]
Buy Contracts	$ 46,434	$ 56,360
Sell Contracts	3,853	3,698
Israeli shekel
Derivative [Line Items]
Buy Contracts	46,434	56,360
Euro
Derivative [Line Items]
Sell Contracts	$ 3,853	$ 3,698

Fair Value Measurements - Additional Information (Detail)	Apr. 30, 2011
Fair Value, Measurement Inputs, Disclosure [Line Items]
Percentage of total amount of assets measured using Level 3 valuation methodologies to total assets	0.50%

Financial Assets that were Accounted for at Fair Value (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Apr. 30, 2011	Jan. 29, 2011
Assets
Total assets	$ 2,074,784	$ 2,621,005
Liabilities
Total liabilities	97	804
Cash equivalents \| Money market funds
Assets
Cash equivalents	356,357	1,230,616
Cash equivalents \| US government and agencies
Assets
Cash equivalents	19,999	106,487
Cash equivalents \| Corporate debt securities
Assets
Cash equivalents	56,688	9,797
Cash equivalents \| Time Deposit
Assets
Cash equivalents	121,926	159,938
Short-term Investments \| US government and agencies
Assets
Investments	624,223	431,683
Short-term Investments \| Corporate debt securities
Assets
Investments	861,215	651,273
Long-term investments \| Auction rate securities
Assets
Investments	26,070	26,226
Prepaids and other current assets \| Forward contracts
Assets
Prepaids and other current assets	2,959	166
Other non-current assets \| Severance pay fund
Assets
Other non-current asset	5,347	4,819
Accrued Liabilities \| Forward contracts
Liabilities
Forward contracts	97	804
Level 1
Assets
Total assets	1,125,120	1,931,149
Level 1 \| Cash equivalents \| Money market funds
Assets
Cash equivalents	356,357	1,230,616
Level 1 \| Cash equivalents \| US government and agencies
Assets
Cash equivalents	19,999	106,487
Level 1 \| Cash equivalents \| Time Deposit
Assets
Cash equivalents	121,926	159,938
Level 1 \| Short-term Investments \| US government and agencies
Assets
Investments	624,223	431,683
Level 1 \| Other non-current assets \| Severance pay fund
Assets
Other non-current asset	2,615	2,425
Level 2
Assets
Total assets	923,594	663,630
Liabilities
Total liabilities	97	804
Level 2 \| Cash equivalents \| Corporate debt securities
Assets
Cash equivalents	56,688	9,797
Level 2 \| Short-term Investments \| Corporate debt securities
Assets
Investments	861,215	651,273
Level 2 \| Prepaids and other current assets \| Forward contracts
Assets
Prepaids and other current assets	2,959	166
Level 2 \| Other non-current assets \| Severance pay fund
Assets
Other non-current asset	2,732	2,394
Level 2 \| Accrued Liabilities \| Forward contracts
Liabilities
Forward contracts	97	804
Level 3
Assets
Total assets	26,070	26,226
Level 3 \| Long-term investments \| Auction rate securities
Assets
Investments	$ 26,070	$ 26,226

Summary of the Change in Fair Values for Level 3 Items (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Changes in fair value (pre-tax):
Beginning Balance	$ 26,226	$ 39,281
Purchases
Sales and redemption	(100)	(50)
Unrealized gain (loss) included in other comprehensive income (loss)	(56)	4
Ending Balance	$ 26,070	$ 39,235

Carrying Value of Goodwill (Detail) $ in Thousands	3 Months Ended
Carrying Value of Goodwill (Detail) $ in Thousands	Apr. 30, 2011 USD ($)
Goodwill [Line Items]
Beginning balance	$ 2,004,833
Additions due to business combinations	1,640
Ending balance	$ 2,006,473

- 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

3 Months Ended

Apr. 30, 2011

USD ($)

Year

Jan. 29, 2011

USD ($)

Acquired Finite-Lived Intangible Assets [Line Items]

Gross Carrying Amounts

$ 1,149,505

$ 1,135,940

Accumulated Amortization and Write-Offs

(1,025,636)

(1,011,309)

Net Carrying Amount

$ 123,869

124,631

Purchased technology

Acquired Finite-Lived Intangible Assets [Line Items]

Minimum useful lives | Year

Maximum useful lives | Year

Gross Carrying Amounts

$ 739,605

726,040

Accumulated Amortization and Write-Offs

(701,863)

(698,877)

Net Carrying Amount

$ 37,742

27,163

Core technology

Acquired Finite-Lived Intangible Assets [Line Items]

Minimum useful lives | Year

Maximum useful lives | Year

Gross Carrying Amounts

$ 212,650

212,650

Accumulated Amortization and Write-Offs

(161,665)

(155,359)

Net Carrying Amount

$ 50,985

57,291

Trade name

Acquired Finite-Lived Intangible Assets [Line Items]

Minimum useful lives | Year

Maximum useful lives | Year

Gross Carrying Amounts

$ 350

350

Accumulated Amortization and Write-Offs

(309)

(299)

Net Carrying Amount

$ 41

Customer contracts

Acquired Finite-Lived Intangible Assets [Line Items]

Minimum useful lives | Year

Maximum useful lives | Year

Gross Carrying Amounts

$ 187,200

187,200

Accumulated Amortization and Write-Offs

(161,799)

(156,774)

Net Carrying Amount

$ 25,401

30,426

In-process research and development

Acquired Finite-Lived Intangible Assets [Line Items]

Useful Lives | Year

^[1]

Gross Carrying Amounts

$ 9,700

9,700

Net Carrying Amount

$ 9,700

[1]

Upon completion of the project, the related in-process research and development ("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.

Goodwill and Acquired Intangible Assets, Net - Additional Information (Detail) $ in Millions	Apr. 30, 2011 USD ($)
Ethernet physical-layer transceivers ("PHY")
Goodwill and Intangible Assets Disclosure [Line Items]
Business acquisition purchase price	$ 16.3

Future Amortization Expense of Identified Intangibles (Detail) - In Process Research and Development Excluded $ in Thousands	3 Months Ended
	Apr. 30, 2011 USD ($)
Fiscal year
Remainder of fiscal 2012	$ 33,418
2013	41,436
2014	26,753
2015	5,351
2016	2,587
Thereafter	4,624
Finite-Lived Intangible Assets, Future Amortization Expense, Total	$ 114,169

Analysis of the Components of the Restructuring Charges and the Payments Made (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of period	$ 3,306	$ 5,397
Non-cash adjustment	12	(318)
Net cash payments	(512)	(701)
Adjustments to previous assumptions		(101)
Restructuring liabilities, end of period	3,425	4,964
Facilities and related charges
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities charges	$ 619	$ 687

- 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	3 Months Ended
Restructuring Charges (Detail) - USD ($) $ in Thousands	Apr. 30, 2011	May 01, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 619	$ 586
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring charges	168	129
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 451	$ 457

Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Apr. 30, 2011 USD ($) Plaintiff
Commitments and Contingencies Disclosure [Line Items]
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 claim 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.
Manufacturing Expense
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment, outstanding commitment \| $	$ 290.3

Shareholders' Equity - Additional Information (Detail) shares in Thousands, $ in Millions	3 Months Ended
	Apr. 30, 2011 USD ($) Year shares	Jan. 29, 2011 shares
Stockholders Equity Note [Line Items]
Shares reserved for issuance \| shares	60,327	56,325
Market Based Option Award
Stockholders Equity Note [Line Items]
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	$ 0.0
Options vested and expected to vest, weighted average remaining contractual term (in years) \| Year	9.9
Unrecognized share based compensation cost, weighted-average period of recognition (in years) \| Year	2.7
Shares reserved for issuance \| shares	3,149
Time Based Option Award
Stockholders Equity Note [Line Items]
Options vested and expected to vest, aggregate intrinsic value	$ 254.2
Options vested and expected to vest, weighted average remaining contractual term (in years) \| Year	5.0
Unrecognized share based compensation cost, weighted-average period of recognition (in years) \| Year	2.2
Shares reserved for issuance \| shares	57,178	56,325
Combined Option Plan And Stock Award Activity
Stockholders Equity Note [Line Items]
Unrecognized compensation cost	$ 217.2
Combined Option Plan And Stock Award Activity \| Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Unrecognized share based compensation cost, weighted-average period of recognition (in years) \| Year	2.0
Employee Stock Purchase Plan, 2000 Plan
Stockholders Equity Note [Line Items]
Description of the plan	In June 2000, the Company adopted the 2000 Employee Stock Purchase Plan (the “Purchase Plan”)
Employee Stock Purchase Plan, 2000 Restated Plan
Stockholders Equity Note [Line Items]
Unrecognized compensation cost	$ 1.8
Description of the plan	On October 22, 2009, the Purchase Plan was amended and restated (the “Restated Purchase Plan”)
Shares reserved for issuance \| shares	23,200
Stock Repurchase Plan 2010
Stockholders Equity Note [Line Items]
Stock 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.
Stock repurchase program, amount authorized	$ 500.0
Common Stock Repurchase Program
Stockholders Equity Note [Line Items]
Stock repurchase program, terms	In March 2011, the Company announced that its Board of Directors has authorized the Company to repurchase up to an additional $500 million, for a total of $1 billion, of its outstanding common shares. The repurchase program will be 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.
Stock repurchase program, additional authorized amount	$ 500.0
Stock repurchase program, amount authorized	$ 1.0
Stock repurchase program, shares repurchased \| shares	50,300
Stock repurchase program, amount repurchased	$ 803.5
Stock repurchase program, amount remaining	$ 109.0

Stock Option Plan Activity (Detail) shares in Thousands	3 Months Ended
Stock Option Plan Activity (Detail) shares in Thousands	Apr. 30, 2011 $ / shares shares
Options Outstanding
Beginning Balance \| shares	56,325
Granted \| shares	5,648
Canceled/Forfeited \| shares	(414)
Exercised or issued \| shares	(1,232)
Ending Balance \| shares	60,327
Vested or expected to vest at April 30, 2011 \| shares	58,768
Exercisable at April 30, 2011 \| shares	43,411
Weighted Average Exercise Price
Beginning Balance \| $ / shares	$ 11.96
Granted \| $ / shares	15.48
Canceled/Forfeited \| $ / shares	14.67
Exercised or issued \| $ / shares	7.99
Ending Balance \| $ / shares	12.35
Vested or expected to vest at April 30, 2011 \| $ / shares	12.33
Exercisable at April 30, 2011 \| $ / shares	$ 12.34
Time Based Option Award
Options Outstanding
Beginning Balance \| shares	56,325
Granted \| shares	2,499
Canceled/Forfeited \| shares	(414)
Exercised or issued \| shares	(1,232)
Ending Balance \| shares	57,178
Vested or expected to vest at April 30, 2011 \| shares	55,804
Exercisable at April 30, 2011 \| shares	43,411
Weighted Average Exercise Price
Beginning Balance \| $ / shares	$ 11.96
Granted \| $ / shares	15.55
Canceled/Forfeited \| $ / shares	14.67
Exercised or issued \| $ / shares	7.99
Ending Balance \| $ / shares	12.18
Vested or expected to vest at April 30, 2011 \| $ / shares	12.17
Exercisable at April 30, 2011 \| $ / shares	$ 12.34
Market Based Option Award
Options Outstanding
Granted \| shares	3,149
Ending Balance \| shares	3,149
Vested or expected to vest at April 30, 2011 \| shares	2,964
Weighted Average Exercise Price
Granted \| $ / shares	$ 15.43
Ending Balance \| $ / shares	15.43
Vested or expected to vest at April 30, 2011 \| $ / shares	$ 15.43

Activity Related to the Non-Vested Portion of the Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) shares in Thousands	3 Months Ended
	Apr. 30, 2011 $ / shares shares
Restricted Stock Outstanding
Beginning Balance \| shares	5,486
Granted \| shares	5,573
Vested \| shares	(1,153)
Canceled/Forfeited \| shares	(122)
Ending Balance \| shares	9,784
Weighted Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 18.75
Granted \| $ / shares	16.08
Vested \| $ / shares	20.17
Canceled/Forfeited \| $ / shares	17.67
Ending Balance \| $ / shares	$ 17.09

Total Stock Compensation by Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 27,480	$ 26,896
Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,695	2,236
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	19,593	18,851
Selling and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,654	3,173
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 3,538	$ 2,636

- 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

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2011	Jan. 29, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation capitalized in inventory	$ 1.5	$ 1.5
Market Based Option Award
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option, vesting term	2.66 years

Weighted Average Assumptions used to Calculate the Fair Value of Each Time-Based Equity Award Using Black-Scholes Option Pricing Model (Detail) - Time Based Option Award	3 Months Ended
	Apr. 30, 2011 Year $ / shares	May 01, 2010 Year $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value \| $ / shares	$ 6.06	$ 9.65
Volatility	42.00%	53.00%
Expected term (in years) \| Year	4.8	4.7
Risk-free interest rate	2.20%	2.20%
Dividend yield

Fair Value of Each Market-Based Option Award Estimated Using Monte Carlo Simulation Model (Detail) - Market Based Option Award	3 Months Ended
	Apr. 30, 2011 $ / 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	0.85%
Risk-free interest rate	3.59%
Dividend yield

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Income Taxes [Line Items]
Effective tax rate, income tax provision (benefit)	0.70%	(0.50%)
Current year tax liability	$ 3.4	$ 3.2
Reduction of unrecognized tax benefits due to the expiration of the statute of limitations	4.3	6.5
Increase in unrecognized tax benefits	$ 1.9	$ 2.2

- Definition

The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

+ 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 45
-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 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-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 Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

+ Details