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Document and Entity Information - shares shares in Millions	3 Months Ended
Document and Entity Information - shares shares in Millions	May 02, 2015	May 28, 2015
Document Type	10-Q
Amendment Flag	false
Document Period End Date	May 02, 2015
Document Fiscal Year Focus	2015
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	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		517.6

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,038,731	$ 1,210,977
Short-term investments	1,462,184	1,318,578
Accounts receivable, net	393,814	420,955
Inventories	339,859	308,162
Prepaid expenses and other current assets	73,563	68,140
Deferred income taxes	17,588	17,228
Total current assets	3,325,739	3,344,040
Property and equipment, net	325,754	340,639
Long-term investments	10,111	10,226
Goodwill	2,029,945	2,029,945
Acquired intangible assets, net	27,645	30,698
Other non-current assets	122,855	128,839
Total assets	5,842,049	5,884,387
Current liabilities:
Accounts payable	297,050	282,899
Accrued liabilities	117,800	131,388
Accrued employee compensation	140,545	154,969
Deferred income	61,093	68,120
Total current liabilities	616,488	637,376
Non-current income taxes payable	66,021	68,729
Other non-current liabilities	28,268	32,193
Total liabilities	710,777	738,298
Commitments and contingencies (Note 10)
Shareholders' equity:
Common shares	1,036	1,030
Additional paid-in capital	3,101,773	3,099,548
Accumulated other comprehensive income	80	308
Retained earnings	2,028,383	2,045,203
Total shareholders' equity	5,131,272	5,146,089
Total liabilities and shareholders' equity	$ 5,842,049	$ 5,884,387

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	May 02, 2015	Jan. 31, 2015
Common shares, par value	$ 0.002	$ 0.002

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Net revenue	$ 724,288	$ 957,830
Operating costs and expenses:
Cost of goods sold	351,153	493,860
Research and development	280,114	295,363
Selling and marketing	36,174	38,358
General and administrative	41,027	30,573
Amortization and write-off of acquired intangible assets	2,568	6,689
Total operating costs and expenses	711,036	864,843
Operating income	13,252	92,987
Interest and other income, net	5,167	1,925
Income before income taxes	18,419	94,912
Provision (benefit) for income taxes	4,329	(4,567)
Net income	$ 14,090	$ 99,479
Net income per share:
Basic	$ 0.03	$ 0.20
Diluted	$ 0.03	$ 0.19
Weighted average shares:
Basic	516,228	505,105
Diluted	527,167	520,751
Cash dividend declared per share	$ 0.06	$ 0.06

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Net income	$ 14,090	$ 99,479
Other comprehensive income, net of tax:
Net change in unrealized gain/loss on marketable securities	(1,860)	378
Net change in unrealized gain/loss on auction rate securities	(115)	177
Net change in unrealized gain/loss on cash flow hedges	1,747	(743)
Other comprehensive income (loss)	(228)	(188)
Comprehensive income	$ 13,862	$ 99,291

- Definition

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

+ References + Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Cash flows from operating activities:
Net income	$ 14,090	$ 99,479
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,620	27,006
Share-based compensation	33,221	29,969
Amortization and write-off of acquired intangible assets	3,053	7,174
Other expense, net	916	1,470
Excess tax benefits from share-based compensation	(18)	(44)
Changes in assets and liabilities:
Accounts receivable	27,141	(63,578)
Inventories	(31,318)	(3,105)
Prepaid expenses and other assets	1,065	(2,161)
Accounts payable	17,125	85,128
Accrued liabilities and other non-current liabilities	(11,576)	(7,134)
Accrued employee compensation	(14,424)	30,001
Deferred income	(7,027)	30,932
Net cash provided by operating activities	58,868	235,137
Cash flows from investing activities:
Purchases of available-for-sale securities	(392,900)	(181,889)
Sales and maturities of available-for-sale securities	247,495	182,311
Investments in privately-held companies		(441)
Purchases of technology licenses	(3,606)	(8,111)
Purchases of property and equipment	(7,334)	(16,131)
Purchase of equipment previously leased	(10,240)
Net cash used in investing activities	(166,585)	(24,261)
Cash flows from financing activities:
Repurchase of common stock	(20,273)
Proceeds from employee stock plans	13,013	19,092
Minimum tax withholding paid on behalf of employees for net share settlement	(22,310)	(24,286)
Dividend payments to shareholders	(30,910)	(30,172)
Payments on technology license obligations	(4,067)
Excess tax benefits from share-based compensation	18	44
Net cash used in financing activities	(64,529)	(35,322)
Net increase in cash and cash equivalents	(172,246)	175,554
Cash and cash equivalents at beginning of period	1,210,977	965,750
Cash and cash equivalents at end of period	$ 1,038,731	$ 1,141,304

The Company and Basis of Presentation

3 Months Ended

May 02, 2015

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 and System-in-a-Package devices, leveraging its extensive technology portfolio of intellectual property in the areas of analog, mixed-signal, digital signal processing, and embedded and stand alone integrated circuits. The majority of the Company’s product portfolio leverages the ARM technology portfolio. The Company also develops platforms that it defines as integrated hardware along with software that incorporates digital computing technologies designed and configured to provide an optimized 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, mobile handsets, connectivity, Internet-of-Things devices and other consumer electronics.

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 2016 and 2015 each have a 52-week period.

The unaudited 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 balance sheet as of May 2, 2015, the results of its operations for the three months ended May 2, 2015 and May 3, 2014, its comprehensive income for the three months ended May 2, 2015 and May 3, 2014, and its cash flows for the three months ended May 2, 2015 and May 3, 2014. The January 31, 2015 condensed consolidated balance sheet data was derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 31, 2015, but does not include all disclosures required for annual periods.

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 fiscal year ended January 31, 2015 as filed on March 26, 2015 with the Securities and Exchange Commission. The results of operations for the three months ended May 2, 2015 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 ongoing basis, the Company evaluates its estimates, including those related to performance-based compensation, revenue recognition, provisions for sales returns and allowances, inventory excess and obsolescence, investment fair values, goodwill and other intangible assets, restructuring, 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 share-based awards that are granted. 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 U.S. dollar.

Recent Accounting Pronouncements

3 Months Ended

May 02, 2015

Recent Accounting Pronouncements

Note 2. Recent Accounting Pronouncements

Accounting Pronouncements Recently Adopted

In April 2014, the Financial Accounting Standards Board (“FASB”) issued an amendment to its guidance regarding the reporting requirements of discontinued operations, which is effective for the Company beginning in the first quarter of fiscal 2016. As a result, the Company has adopted and will apply the new guidance for any future dispositions that meet the criteria of a discontinued operation under the amendment.

Accounting Pronouncements Not Yet Effective

In April 2015, the FASB issued new guidance to help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement. The guidance provides a basis for evaluating whether a cloud computing arrangement includes a software license or whether the arrangement should be accounted for as a service contract. The guidance is effective for annual and interim reporting periods beginning after December 15, 2015. The Company is currently evaluating the effect this new guidance will have on its consolidated financial statements.

In May 2014, the FASB issued a new standard on the recognition of revenue from contracts with customers, which will supersede nearly all existing revenue recognition guidance under GAAP. Under the new standard, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additional disclosures regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, and assets recognized from costs incurred to obtain or fulfill a contract will also be required. The standard is effective for the Company’s first quarter of fiscal 2018 and allows for either full retrospective or modified retrospective adoption. Early adoption is not permitted. The Company is currently evaluating the effects of the new guidance and has not yet selected a transition method nor has it determined the potential effects of adoption on its financial statements.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

+ Details

Investments

3 Months Ended

May 02, 2015

Investments

Note 3. Investments

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


	May 2, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	1,036,538	$	2,599	$	(905	)	$	1,038,232
U.S. government and agency debt		269,845		179		(39	)		269,985
Asset backed securities		100,422		79		(13	)		100,488
Foreign government and agency debt		16,959		11		(6	)		16,964
Municipal debt securities		36,511		31		(27	)		36,515

Total short-term investments		1,460,275		2,899		(990	)		1,462,184
Long-term investments:
Available-for-sale:
Auction rate securities		12,500		—		(2,389	)		10,111

Total long-term investments		12,500		—		(2,389	)		10,111

Total investments	$	1,472,775	$	2,899	$	(3,379	)	$	1,472,295


	January 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	983,008	$	3,872	$	(563	)	$	986,317
U.S. government and agency debt		178,898		265		(7	)		179,156
Asset backed securities		91,432		108		(9	)		91,531
Foreign government and agency debt		28,051		61		(2	)		28,110
Municipal debt securities		33,421		47		(4	)		33,464

Total short-term investments		1,314,810		4,353		(585	)		1,318,578
Long-term investments:
Available-for-sale:
Auction rate securities		12,500		—		(2,274	)		10,226

Total long-term investments		12,500		—		(2,274	)		10,226

Total investments	$	1,327,310	$	4,353	$	(2,859	)	$	1,328,804

As of May 2, 2015, the Company’s investment portfolio included auction rate securities with an aggregate par value of $12.5 million classified as long-term investments. Although these securities have continued to pay interest, there is currently limited trading volume. To estimate the fair value of the auction rate securities, the Company uses a discounted cash flow model based on estimated timing and amount of future interest and principal payments. In developing the cash flow model, the Company considers the credit quality and liquidity of the underlying securities and related issuer, the collateralization of underlying security investments and other considerations. The fair value of these auction rate securities as of May 2, 2015 was $2.4 million less than their par value. Based on the Company’s balance of approximately $2.5 billion in cash, cash equivalents and short-term investments, and the fact that the Company continues to generate positive cash flow from operations on a quarterly basis, the Company does not anticipate having to sell these securities below par value and does not have the intent to sell these auction rate securities until recovery. Since the Company considers the impairment to be temporary, the Company recorded the unrealized loss to accumulated other comprehensive income, a component of shareholders’ equity.

Gross realized gains and gross realized losses on sales of available-for-sales securities are presented in the following table (in thousands):


	Three Months Ended
	May 2, 2015			May 3, 2014
Gross realized gains	$	443		$	472
Gross realized losses		(107	)		(25	)

Total net realized gains	$	336		$	447

The contractual maturities of available-for-sale securities are presented in the following table (in thousands):


	May 2, 2015				January 31, 2015
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	372,927	$	373,005	$	361,108	$	361,396
Due between one and five years		1,078,275		1,080,123		950,702		954,151
Due over five years		21,573		19,167		15,500		13,257

	$	1,472,775	$	1,472,295	$	1,327,310	$	1,328,804

For individual securities that have been in a continuous unrealized loss position, the fair value and gross unrealized loss for these securities aggregated by investment category and length of time in an unrealized position are presented in the following tables (in thousands):


	May 2, 2015
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	368,427	$	(875	)	$	4,959	$	(30	)	$	373,386	$	(905	)
U.S. government and agency debt		80,502		(39	)		—		—			80,502		(39	)
Asset backed securities		27,098		(13	)		—		—			27,098		(13	)
Foreign government and agency debt		11,922		(6	)		—		—			11,922		(6	)
Municipal debt securities		12,341		(27	)		—		—			12,341		(27	)
Auction rate securities		—		—			10,111		(2,389	)		10,111		(2,389	)

Total securities	$	500,290	$	(960	)	$	15,070	$	(2,419	)	$	515,360	$	(3,379	)


	January 31, 2015
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	243,699	$	(558	)	$	2,005	$	(5	)	$	245,704	$	(563	)
U.S. government and agency debt		32,165		(7	)		—		—			32,165		(7	)
Asset backed securities		25,053		(9	)		—		—			25,053		(9	)
Foreign government and agency debt		2,999		(2	)		—		—			2,999		(2	)
Municipal debt securities		2,845		(4	)		—		—			2,845		(4	)
Auction rate securities		—		—			10,226		(2,274	)		10,226		(2,274	)

Total securities	$	306,761	$	(580	)	$	12,231	$	(2,279	)	$	318,992	$	(2,859	)

Supplemental Financial Information

3 Months Ended

May 02, 2015

Supplemental Financial Information

Note 4. Supplemental Financial Information (in thousands)

Consolidated Balance Sheets


	May 2, 2015		January 31, 2015
Inventories:
Work-in-process	$	187,249	$	183,869
Finished goods		152,610		124,293

Total inventories	$	339,859	$	308,162


	May 2, 2015			January 31, 2015
Property and equipment, net:
Machinery and equipment	$	610,076		$	601,961
Buildings		144,320			144,320
Computer software		101,304			99,312
Land		53,373			53,373
Building improvements		49,800			49,753
Leasehold improvements		51,496			51,434
Furniture and fixtures		28,007			27,883
Construction in progress		2,323			6,167

		1,040,699			1,034,203
Less: Accumulated depreciation and amortization		(714,945	)		(693,564	)

Total property and equipment, net	$	325,754		$	340,639


	May 2, 2015			January 31, 2015
Other non-current assets:
Technology and other licenses	$	55,445		$	61,217
Deferred tax assets		22,297			22,273
Investments in privately-held companies		9,267			9,267
Prepaid land use rights		13,355			13,432
Deposits		8,144			7,903
Other		14,347			14,747

Total other non-current assets	$	122,855		$	128,839


	May 2, 2015			January 31, 2015
Accrued liabilities:
Accrued rebates	$	31,685		$	39,105
Accrued royalties		22,675			24,680
Technology license obligations		13,677			14,428
Accrued legal expense		6,951			10,027
Other		42,812			43,148

Total accrued liabilities	$	117,800		$	131,388


	May 2, 2015			January 31, 2015
Other non-current liabilities:
Technology license obligations	$	14,625		$	16,468
Long-term accrued employee compensation		4,890			4,610
Other		8,753			11,115

Other non-current liabilities	$	28,268		$	32,193

Accumulated other comprehensive income (loss)

The changes in accumulated other comprehensive income by component are presented in the following tables (in thousands):


	Unrealized Gain (Loss) on Marketable Securities			Unrealized Gain (Loss) on Auction Rate Securities			Unrealized Gain (Loss) on Cash Flow Hedges			Total
Balance at January 31, 2015	$	3,768		$	(2,274	)	$	(1,186	)	$	308
Other comprehensive income before reclassifications		(1,528	)		(115	)		803			(840	)
Amounts reclassified from accumulated other comprehensive income		(332	)		—			944			612

Other comprehensive income (loss)		(1,860	)		(115	)		1,747			(228	)

Balance at May 2, 2015	$	1,908		$	(2,389	)	$	561		$	80


	Unrealized Gain (Loss) on Marketable Securities			Unrealized Gain (Loss) on Auction Rate Securities			Unrealized Gain (Loss) on Cash Flow Hedges			Total
Balance at February 1, 2014	$	2,534		$	(2,871	)	$	934		$	597
Other comprehensive income before reclassifications		798			177			42			1,017
Amounts reclassified from accumulated other comprehensive income		(420	)		—			(785	)		(1,205	)

Other comprehensive income (loss)		378			177			(743	)		(188	)

Balance at May 3, 2014	$	2,912		$	(2,694	)	$	191		$	409

The amounts reclassified from accumulated other comprehensive income by component are presented in the following table (in thousands):


	Three Months Ended
Affected Line Item in the Statement of Operations	May 2, 2015			May 3, 2014
Interest and other income, net:
Available-for-sale securities:
Marketable securities	$	332		$	420
Cash flow hedges:
Research and development		(864	)		721
Selling and marketing		(67	)		62
General and administrative		(13	)		2

Total	$	(612	)	$	1,205

Consolidated Statement of Operations


	Three Months Ended
	May 2, 2015			May 3, 2014
Interest and other income, net:
Interest income	$	4,077		$	2,609
Realized gain on investments		336			447
Currency translation gain (loss)		407			(1,025	)
Other income		567			219
Interest expense		(220	)		(325	)

	$	5,167		$	1,925

Net income per share

The Company reports both basic net income per share, which is based on 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 potentially dilutive 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
	May 2, 2015		May 3, 2014
Numerator:
Net income	$	14,090	$	99,479

Denominator:
Weighted average shares — basic		516,228		505,105
Effect of dilutive securities:
Share-based awards		10,939		15,646

Weighted average shares — diluted		527,167		520,751

Net income per share:
Basic	$	0.03	$	0.20
Diluted	$	0.03	$	0.19

Anti-dilutive potential shares are presented in the following table:


	Three Months Ended
	May 2, 2015		May 3, 2014
Weighted average shares outstanding from stock options:
Time-based options		19,615		19,069
Market-based options		2,232		2,384

		21,847		21,453

Weighted average exercise price:
Time-based options	$	17.64	$	18.17

Market-based options	$	15.43	$	15.43

Total	$	17.41	$	17.86

Anti-dilutive potential shares for stock options are excluded from the calculation of diluted earnings per share for the periods reported above because either their exercise price exceeded the average market price during the period or certain stock options with exercise prices less than the average market price were determined to be anti-dilutive based on applying the treasury stock method.

Derivative Financial Instruments

3 Months Ended

May 02, 2015

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 effect of currency fluctuations. The Company’s policy is to enter into foreign currency forward contracts with maturities less than 12 months that mitigate the effect of rate fluctuations on certain local currency denominated operating expenses. All derivative instruments 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.

The notional amounts of outstanding forward contracts were as follows (in thousands):


	Buy Contracts
	May 2, 2015		January 31, 2015
Israeli shekel	$	34,984	$	51,326

Cash Flow Hedges. The Company designates and documents its foreign currency forward exchange contracts as cash flow hedges for certain operating expenses. 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 income, net.

The fair value of foreign currency exchange contracts was not significant as of any period presented.

The following table provides information about gains (losses) associated with the Company’s derivative financial instruments (in thousands):


	Location of Gains (Losses) in Statement of Operations	Amount of Gains (Losses) in Statement of Operations for the three months ended
	Location of Gains (Losses) in Statement of Operations	May 2, 2015			May 3, 2014
Derivatives designated as cash flow hedges:
Forward contracts:	Research and development	$	(991	)	$	598
	Selling and marketing		(77	)		52
	General and administrative		(14	)		2

		$	(1,082	)	$	652

The portion of gains excluded from the assessment of hedge effectiveness are included in interest and other income, net, and these amounts were not material in the three months ended May 2, 2015 and May 3, 2014. In addition, realized losses from forward contracts that are not designated as hedging instruments that are included in interest and other income, net, were not material in the three months ended May 2, 2015 and May 3, 2014. The Company also reports hedge ineffectiveness from derivative financial instruments in current earnings, which was not material in the three months ended May 2, 2015 and May 3, 2014. No cash flow hedges were terminated as a result of forecasted transactions that did not occur.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Fair Value Measurements

3 Months Ended

May 02, 2015

Fair Value Measurements

Note 6. Fair Value Measurements

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

Level 1—Observable inputs that reflect quoted prices 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’s Level 1 assets include institutional money-market funds that are classified as cash equivalents and marketable investments in U.S. government and agency debt, which are valued primarily using quoted market prices. The Company’s Level 2 assets include its marketable investments in time deposits, corporate debt securities, foreign government and agency debt, municipal debt securities and asset backed securities as the market inputs to value these instruments consist of market yields, reported trades and broker/dealer quotes, which are corroborated with observable market data. In addition, forward contracts, and the severance pay fund are classified within Level 2 as the valuation inputs are based on quoted prices and market observable data of similar instruments. The Company’s Level 3 assets include its investments in auction rate securities, which are classified within Level 3 because there are currently no active markets for the auction rate securities and consequently the Company is unable to obtain independent valuations from market sources. Therefore, the auction rate securities are valued using a discounted cash flow model. Some of the inputs to the cash flow model are unobservable in the market. The Company’s Level 3 assets also include corporate equipment which it acquired through an early buyout option under an operating lease (see “Note 8 – Restructuring” in the Notes to the Unaudited Condensed Consolidated Financial Statements) since it is valued based on market prices of similar assets in a limited market. The total amount of assets measured using Level 3 valuation methodologies represented 0.2% of total assets as of May 2, 2015.

The tables below set forth, by level, the Company’s financial assets that were accounted for at fair value as of May 2, 2015 and January 31, 2015. The tables do not include assets and liabilities that are measured at historical cost or any basis other than fair value (in thousands):


	Fair Value Measurements at May 2, 2015
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
U.S. government and agency debt	$	1,000	$	—	$	—	$	1,000
Money market funds		875		—		—		875
Time deposits		—		183,468		—		183,468
Corporate debt securities		—		20,004		—		20,004
Short-term investments:
U.S. government and agency debt		269,985		—		—		269,985
Corporate debt securities		—		1,038,232		—		1,038,232
Asset backed securities		—		100,488		—		100,488
Foreign government and agency debt		—		16,964		—		16,964
Municipal debt securities		—		36,515		—		36,515
Prepaid expenses and other current assets:
Foreign currency forward contracts		—		702		—		702
Long-term investments:
Auction rate securities		—		—		10,111		10,111
Other non-current assets:
Severance pay fund		—		1,842		—		1,842

Total assets	$	271,860	$	1,398,215	$	10,111	$	1,680,186

Liabilities
Accrued liabilities:
Foreign currency forward contracts	$	—	$	193	$	—	$	193


	Fair Value Measurements at January 31, 2015
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	111,286	$	—	$	—	$	111,286
Time deposits		—		213,012		—		213,012
Corporate debt securities		—		21,999		—		21,999
Short-term investments:
U.S. government and agency debt		179,156		—		—		179,156
Corporate debt securities		—		986,317		—		986,317
Asset backed securities		—		91,531		—		91,531
Foreign government and agency debt		—		28,110		—		28,110
Municipal debt securities		—		33,464		—		33,464
Prepaid expenses and other current assets:
Foreign currency forward contracts		—		124		—		124
Long-term investments:
Auction rate securities		—		—		10,226		10,226
Other non-current assets:
Severance pay fund		—		1,758		—		1,758

Total assets	$	290,442	$	1,376,315	$	10,226	$	1,676,983

Liabilities
Accrued liabilities:
Foreign currency forward contracts	$	—	$	1,379	$	—	$	1,379

The following table summarizes the change in fair value for Level 3 assets (in thousands):


	Three Months Ended
	May 2, 2015			May 3, 2014
Beginning balance	$	10,226		$	16,279
Sales and redemptions		—			(3,000	)
Unrealized losses included in accumulated other comprehensive income		(115	)		177

Ending balance	$	10,111		$	13,456

Assets measured and recorded at fair value on a non-recurring basis include corporate equipment classified as held for sale, which had a fair value of $10.2 million as of May 2, 2015 (see “Note 8 – Restructuring” in the Notes to the Unaudited Condensed Consolidated Financial Statements).

- 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 + Details

Acquired Intangible Assets, Net

3 Months Ended

May 02, 2015

Acquired Intangible Assets, Net

Note 7. Acquired Intangible Assets, Net

The carrying amount of acquired intangible assets, net, are as follows (in thousands):


		May 2, 2015							January 31, 2015
	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	4 - 7 years	$	35,498	$	(17,240	)	$	18,258	$	35,498	$	(15,684	)	$	19,814
Core technology	5 - 8 years		850		(465	)		385		850		(423	)		427
Trade names	5 years		1,300		(893	)		407		1,300		(828	)		472
Customer intangibles	5 - 7 years		28,600		(20,005	)		8,595		28,600		(18,615	)		9,985

Total intangible assets, net		$	66,248	$	(38,603	)	$	27,645	$	66,248	$	(35,550	)	$	30,698

Based on the identified intangible assets recorded at May 2, 2015, the future amortization expense for the next five fiscal years is as follows (in thousands):


Fiscal Year
Remainder of fiscal 2016	$	9,159
2017		11,027
2018		5,599
2019		1,860
2020		—

	$	27,645

Restructuring

3 Months Ended

May 02, 2015

Restructuring

Note 8. Restructuring

In March 2015, the Company exercised the early buyout option under an operating lease for corporate equipment that it had planned to sell as part of a cost reduction action. The Company is actively seeking a buyer and has classified the equipment as held for sale included in prepaid and current assets on the condensed consolidated balance sheet. As a result, the Company ceased depreciation on these assets and now measures the carrying value at the lower of net book value or fair value (less cost to sell). As of May 2, 2015, since the fair value of the equipment was lower than its net book value, the Company recorded an impairment charge of $0.5 million resulting in a carrying value of $10.2 million. During the three months ended May 2, 2015, the Company also continued to make payments and incur ongoing operating expenses related to vacated facilities under previous restructure actions.

The following table presents detail of the related restructuring charges recorded by the Company (in thousands):


	Three Months Ended
	May 2, 2015		May 3, 2014
Severance and related costs	$	—	$	4,617
Facilities and related costs		19		444
Other exit-related costs		—		10

		19		5,071
Impairment loss and write-off of assets:
Equipment		573		17
Acquired intangible asset		—		3,386

	$	592	$	8,474

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


	Three Months Ended
	May 2, 2015		May 3, 2014
Research and development	$	—	$	4,682
Selling and marketing		—		48
General and administrative		592		358
Write-off of acquired intangible assets		—		3,386

	$	592	$	8,474

The following table sets forth a reconciliation of the beginning and ending restructuring liability balances by each major type of costs associated with the restructuring charges (in thousands):


	Facilities and Related Costs			Other Exit-Related Costs			Total
Balance at January 31, 2015	$	1,339		$	3,230		$	4,569
Restructuring charges		19			—			19
Net cash payments		(312	)		(3,230	)		(3,542	)

Balance at May 2, 2015	$	1,046		$	—		$	1,046

The balance at May 2, 2015 for facility and related costs includes remaining payments under lease obligations related to vacated space that are expected to be paid through fiscal 2018.

Income Tax

3 Months Ended

May 02, 2015

Income Tax

Note 9. Income Tax

The income tax provision for the three months ended May 2, 2015 included the current income tax liability of $4.3 million, plus an additional provision of $3.1 million related to a $15.4 million cash payment to the Company’s Chief Executive Officer (see “Note 13 – Related Party Transactions” in the Notes to the Unaudited Condensed Consolidated Financial Statements), which were offset by a net reduction in unrecognized tax benefits of $3.1 million. The net reduction in unrecognized tax benefits arose from the release of $4.0 million due to expiration of the statue of limitations in a non-U.S. jurisdiction, which was partially offset by penalties and interest of $0.9 million accrued on the outstanding unrecognized tax benefit balance.

The income tax benefit for the three months ended May 3, 2014 included the current income tax liability of $5.7 million, which was offset by tax benefits of $2.5 million from a net reduction in unrecognized tax benefits and $7.8 million from an increase in the net deferred tax assets because of the Company’s continued discussions with the Singapore tax authorities that resulted in an agreement for a major portion of the pre-tax income to be taxed at a new Development and Expansion Incentive (“DEI”). The net reduction in unrecognized tax benefits arose from the release of $4.9 million due to expiration of the statute of limitations, which was reduced by an increase in current unrecognized tax benefit estimates of $1.1 million and a $1.3 million tax expense related to the fiscal year 2014 tax return of a non-U.S. jurisdiction.

It is reasonably possible that the amount of unrecognized tax benefits could increase or decrease significantly due to changes in tax law in various jurisdictions, new tax audits and changes in the U.S. dollar as compared to foreign currencies within the next 12 months. Excluding these factors, uncertain tax positions may decrease by as much as $11 million from the lapse of statutes of limitation in various jurisdictions during the next 12 months. Government tax authorities from several non-U.S. jurisdictions are also examining returns. The Company believes that it has adequately provided for any reasonably foreseeable outcomes related to its tax audits and that any settlement will not have a material effect on its results at this time.

The Company operates under tax incentives in certain countries, which may be extended if certain additional requirements are satisfied. The tax incentives are conditional upon meeting certain employment and investment thresholds. The impact of these tax incentives decreased foreign taxes by $3.3 million in each of the three months ended May 2, 2015 and May 3, 2014. The benefit of the tax incentives on net income per share was $0.01 per share for the three months ended May 2, 2015 and less than $0.01 per share for the three months ended May 3, 2014.

The Company’s principal source of liquidity as of May 2, 2015 consisted of approximately $2.5 billion of cash, cash equivalents and short-term investments, of which approximately $900 million was held by foreign subsidiaries (outside Bermuda). Approximately $500 million of this amount held by foreign subsidiaries is related to undistributed earnings, which have been indefinitely reinvested outside of Bermuda. These funds are primarily held in China, Israel, the United States and Switzerland. The Company plans to use such amounts to fund various activities outside of Bermuda including working capital requirements, capital expenditures for expansion, funding of future acquisitions, or other financing activities. If such funds were needed by the parent company in Bermuda or if the amounts were otherwise no longer considered indefinitely reinvested, the Company would incur a tax expense of approximately $150 million.

Commitments and Contingencies

3 Months Ended

May 02, 2015

Commitments and Contingencies

Note 10. 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 payment of all costs and expenses incurred through the date of cancellation. As of May 2, 2015, these foundries had incurred approximately $212.9 million of manufacturing costs and expenses relating to the Company’s outstanding purchase orders.

Intellectual Property Indemnification

The Company has agreed to indemnify certain customers for claims made against the Company’s products, where such claims allege infringement of third party intellectual property rights, including, but not limited to, patents, registered trademarks, and/or copyrights. Under the aforementioned indemnification clauses, the Company may be obligated to defend the customer and pay for the damages awarded against the customer under an infringement claim as well as the attorneys’ fees and costs. The Company’s indemnification obligations generally do not expire after termination or expiration of the agreement containing the indemnification obligation. Generally, 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

The Company and certain of its subsidiaries are currently parties to various legal proceedings, including those noted in this section. The legal proceedings and claims described below could result in substantial costs and could divert the attention and resources of the Company’s management. The Company is also engaged in other legal proceedings and claims not described below, which arise in the ordinary course of its business. Litigation is subject to inherent uncertainties and unfavorable rulings could occur. An unfavorable ruling in litigation could require the Company to pay damages, one-time license fees or ongoing royalty payments, and could prevent the Company from manufacturing or selling some of its products or limit or restrict the type of work that employees involved in such litigation may perform for the Company, any of which could adversely affect financial results in future periods. The Company believes that its products do not infringe valid and enforceable claims and it will continue to conduct a vigorous defense in these proceedings. However, 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.

As of May 2, 2015, the Company had no accrued liability related to certain legal proceedings described below in this section. Additionally, the Company has not recorded any amounts for contingent losses associated with the matters described below based on its belief that losses, while reasonably possible, are not probable. Unless otherwise stated, the Company is currently unable to predict the final outcome of these lawsuits and therefore cannot determine the likelihood of loss nor estimate a range of possible loss.

Carnegie Mellon University Litigation. On March 6, 2009, CMU filed a complaint in the U.S. District Court for the Western District of Pennsylvania naming Marvell Semiconductor, Inc. (“MSI”) and the Company as defendants and alleging patent infringement. CMU has asserted U.S. Patent Nos. 6,201,839 and 6,438,180 (collectively, the “CMU patents in suit”), which relate to read-channel integrated circuit devices and the hard disk drive (“HDD”) incorporating such devices. A jury trial began on November 26, 2012. On December 26, 2012, a jury delivered a verdict that found the CMU patents in suit were literally and willfully infringed and valid, and awarded past damages in the amount of $1.17 billion. CMU sought in its post-trial motions enhanced damages up to three times the jury verdict, pre-judgment interest up to $322 million, post-judgment interest, supplemental damages, attorneys’ fees, and an injunction and/or ongoing royalties. Post-trial motions were heard on May 1 and 2, 2013. On June 26, 2013, the District Court denied CMU’s post-trial motion for attorney fees without prejudice. On August 23, 2013, the District Court denied the Company’s motion for mistrial. On September 23, 2013, the District Court denied the Company’s motion for judgment as a matter of law or a new trial on non-infringement, invalidity and other non-damages issue as well as the Company’s motion for reduced damages. On the same day, the District Court granted-in-part CMU’s motion for a finding of willful infringement and enhanced damages, reserving its further rulings on any enhancement of the verdict for a separate opinion. On December 6, 2013, CMU filed a motion to permit registration of judgment and a motion for supplemental relief including a request to enjoin future share repurchases, any leveraged buyout or similar asset leveraging transaction, and dividends, in the absence of a court approved bond or other security. On December 23, 2013, the District Court denied the motions. On January 8, 2014, CMU filed a motion for telephonic status conference, which was denied on January 28, 2014. On January 14, 2014, the District Court denied the Company’s post-trial motion on laches. On March 31, 2014, the District Court rejected CMU’s motion for an injunction. The District Court also denied CMU’s request for pre-judgment interest, and substantially scaled back CMU’s request for enhanced damages. Based on these decisions, the District Court calculated the damages including enhancement to total approximately $1.54 billion, and held that, under its decision, CMU is entitled to post judgment interest and an ongoing royalty. On May 7, 2014, the District Court entered final judgment, from which the Company filed a notice of appeal on May 14, 2014. The Company filed its opening appeal brief on August 4, 2014. CMU filed its opposition brief on October 20, 2014 and the Company filed its reply brief on November 20, 2014. The District Court has required the Company to report ongoing royalties under the current judgment. Based on the royalty rate assessed by the District Court, such additional royalties for the period of time commencing on the date ordered by the District Court, January 15, 2013, through May 2, 2015 could be as much as $450 million. The Company has secured certain surety bonds for the duration of the appeal to stay execution of judgment pending the appeal. See “—Surety Bonds.”

The Company and MSI believe that the evidence and the law do not support the jury’s findings of infringement, validity and the award of damages and do not believe a material loss is probable. The Company believes that there are strong grounds for appeal and the Company and MSI are currently pursuing an appeal before the U.S. Court of Appeals for the Federal Circuit in Washington, D.C. which held a hearing for oral argument on April 7, 2015. The Company believes the low end of the possible range of loss is zero, but it cannot reasonably estimate the upper range of the possible loss, as a number of factors could significantly change the assessment of damages.

USEI Litigation. On October 9, 2009, U.S. Ethernet Innovations, LLC (“USEI”) filed a complaint in the U.S. District Court for 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, which 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 District Court issued an order granting the defendants’ motion to transfer the action to the U.S. District Court for the Northern District of California; the case was formally transferred on August 23, 2010. On September 14, 2011, USEI withdrew its allegations against MSI for the ‘459 patent. The District Court issued a first claim construction ruling on January 31, 2012 and a supplemental claim construction ruling on August 29, 2012. On August 16, 2013, the District Court granted defendants’ summary judgment motion to preclude the plaintiff from recovering certain pre-suit damages. On November 7, 2014, on summary judgment, the District Court found that all the patents-in-suit were either invalid or not infringed. On December 1, 2014, the District Court entered a judgment in favor of defendants and awarded defendants’ costs. On December 29, 2014, USEI filed a motion to alter or amend the District Court’s summary judgment order, which the District Court denied on March 31, 2015. On April 24, 2015, USEI filed its notice of appeal.

Azure Networks Litigation. On March 22, 2011, Azure Networks, LLC (“Azure”) and Tri-County Excelsior Foundation filed suit in the U.S. District Court for the Eastern District of Texas against MSI and eight other companies. The Complaint asserts U.S. Patent No. 7,756,129 against MSI’s Bluetooth products. MSI filed its answer and counterclaims on July 20, 2011. On November 2, 2012, MSI and the other defendants filed a motion for summary judgment of invalidity, which was denied. A claim construction hearing was held on December 20, 2012. On January 15, 2013, the magistrate judge issued a claim construction ruling. On May 20, 2013, the District Court issued an order denying plaintiff’s motion for reconsideration and adopted the magistrate judge’s claim construction ruling. On May 30, 2013, the District Court entered a judgment of non-infringement. On June 24, 2013, Azure appealed. On November 6, 2014, the Federal Circuit issued an order vacating the judgment of non-infringement and remanding for further proceedings. MSI filed a petition for writ of certiorari to the United States Supreme Court on February 4, 2015. On February 10, 2015, the District Court stayed all proceedings pending the Supreme Court’s ruling on the Company’s petition. On April 20, 2015, the United States Supreme Court granted MSI’s petition, vacating the Federal Circuit’s judgment and remanding the case for further consideration.

On January 13, 2015, Azure filed a second suit against MSI in the U.S. District Court for the Eastern District of Texas, alleging infringement of U.S. Patent Nos. 8,582,570; 8,582,571; 8,588,196; 8,588,231; 8,589,599; 8,675,590; 8,683,092; 8,700,815; 8,732,347; and 8,732,361, purportedly related to certain Wi-Fi and near field communication (“NFC”) technologies. The complaint seeks unspecified damages. On April 6, 2015, MSI filed an amended answer and counterclaims.

France Telecom Litigation. On June 26, 2012, France Telecom S.A. filed a complaint against MSI in the U.S. District Court for the Southern District of New York. The complaint asserts U.S. Patent No. 5,446,747 against MSI’s communications processors and thin modems. The complaint seeks unspecified damages as well as injunctive relief. MSI answered the complaint on July 18, 2012 and August 1, 2012. On July 30, 2012, MSI filed a motion to transfer the lawsuit to the U.S. District Court for the Northern District of California. On September 17, 2012, the Court granted MSI’s motion and transferred the case to the Northern District of California. A claim construction hearing was held on December 13, 2013. On April 14, 2014, the Court denied MSI’s motion for summary judgment of invalidity, and granted MSI’s summary judgment motion concerning certain damages preclusion. A jury trial began on September 17, 2014. On September 30, 2014, a jury delivered a verdict that found the patent in suit was literally, but not willfully, infringed and valid, and awarded damages. The award did not have a significant impact on the Company’s financial statements. A hearing for post-trial motions and non-jury issues took place on January 14, 2015. On March 2, 2015, the District Court issued an order on post-trial briefs finding no direct infringement by Marvell as a matter of law and entered judgment in favor of Marvell. On March 30, 2015, France Telecom filed a notice of appeal. On April 10, 2015, MSI filed a notice of cross appeal.

Vantage Point Technology Patent Litigation. On November 21, 2013, Vantage Point Technology, Inc. (“VPT”) filed suit against a third-party defendant in the U.S. District Court for the Eastern District of Texas for patent infringement relating to processor technology. On February 3, 2014, VPT filed an amended complaint against the third party and added MSI as an additional defendant. The complaint seeks unspecified damages. On December 8, 2014, the case was transferred to the U.S. District Court for the Northern District of California. The case was dismissed with prejudice in March, 2015.

Bandspeed Litigation. On May 9, 2014, Bandspeed, Inc. filed suit against MSI in the U.S. District Court for the Western District of Texas, alleging infringement of U.S. Patent Nos. 7,027,418; 7,570,614; 7,477,624; 7,903,608; and 8,542,643, purportedly related to certain Bluetooth technology. The complaint seeks unspecified damages. On February 13, 2015, Bandspeed amended its complaint and added allegations of infringement of U.S. Patent No. 8,873,500. On April 29, 2015, the parties filed a joint motion to dismiss the case with prejudice. The case was dismissed with prejudice on May 7, 2015.

NXP Litigation. On January 22, 2015, NXP Semiconductors N.V. filed suit against MSI in the U.S. District Court for the Northern District of California, alleging infringement of U.S. Patent Nos. 5,939,791; 7,039,133; 8,185,050; and 8,203,432, purportedly related to certain NFC technology. The complaint seeks unspecified damages. MSI filed its response and counterclaims on February 26, 2015. Marvell International Limited (“MIL”) also filed counterclaims against NXP Semiconductors U.S.A. (“NXP USA”), alleging infringement of U.S. Patent Nos. 7,047,393; 7,555,065; and 7,302,600. On February 2, 2015, MIL filed suit against NXP USA in the U.S. District Court for the Central District of California, alleging patent infringement of U.S. Patent Nos. 8,171,309; 7,957,777; 7,454,634; and 6,903,448, related to certain NFC and automotive technologies. On April 15, 2015, the parties filed stipulations to dismiss without prejudice their claims and counterclaims in both cases.

Paone Litigation. On February 6, 2015, Luciano F. Paone filed suit against MSI in the U.S. District Court for the Eastern District of New York, alleging infringement of U.S. Patent No. 6,259,789, purportedly related to certain encryption technology. The complaint seeks unspecified damages. MSI filed its response on May 22, 2015.

Innovatio Litigation. On March 16, 2015, Innovatio IP Ventures, LLC filed suit against MSI in the U.S. District Court for the Northern District of Illinois, alleging infringement of U.S. Patent Nos. 6,697,415; 5,844,893; 5,740,366; 7,916,747; 6,665,536; 7,013,138; 7,107,052; 5,546,397; 7,710,907; 7,710,935; 6,714,559; 7,457,646; and 6,374,311, purportedly related to certain wireless technology. The complaint seeks unspecified damages.

Visual Memory Litigation. On May 8, 2015, Visual Memory LLC (“Visual Memory”) filed suit against MSI in the District of Delaware, alleging infringement of U.S. Patent Nos. 5,654,932 and 6,026,027, purportedly related to certain memory technology. The complaint seeks unspecified damages.

Surety Bonds

On May 14, 2014, the Company filed a Notice of Appeal to appeal the final judgment issued by the District Court in the CMU litigation. In order to stay the execution of the final judgment pending its appeal, the Company filed a supersedeas bond for $1.54 billion with the District Court. The bond was issued by a consortium of sureties authorized by the U.S. Treasury. If the judgment is affirmed after the completion of all appellate proceedings, and the Company does not thereafter fully satisfy the judgment within thirty days, the sureties are obligated under the bond to make payment to CMU. In support of the bond, the Company entered into separate indemnity agreements with each of the sureties to indemnify the sureties from all costs and payments made under the bond. The indemnity agreements did not require collateral to be posted at the time of the issuance of the bond. Therefore no cash is considered restricted as of the date of this filing. However, the indemnity agreements provide that each of the sureties have the right to demand to be placed in funds or call for collateral under pre-defined events. The indemnity agreements will remain outstanding for as long as the underlying bond remains outstanding.

The Court has required the Company to report ongoing royalties under the current judgment. Based on the royalty rate assessed by the District Court, such additional royalties for the period of time commencing on the date ordered by the District Court, January 15, 2013, through May 2, 2015 could be as much as $450 million. On November 14, 2014, the Company filed a second surety bond for $216 million and filed a commitment letter from the sureties to issue up to an additional $95 million in bonding under certain conditions. The second bond and commitment are secured by the Company’s campus located in Santa Clara, California, which has a carrying value of $138 million at May 2, 2015. The Company and CMU have agreed that the second bond and commitment satisfy the security for ongoing royalties while the appeal is pending.

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 may 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 for general commercial obligations, 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. Some 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. In general, the Company does not record any liability for these indemnities, commitments and guarantees in the accompanying consolidated balance sheets as the amounts cannot be reasonably estimated and are not considered probable. 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.

Shareholders' Equity

3 Months Ended

May 02, 2015

Shareholders' Equity

Note 11. Shareholders’ Equity

Stock Plans

Stock option activity under the Company’s stock option and stock incentive plans is included in the following table (in thousands, except per share amounts):


	Time-Based Options					Market-Based Options					Total
	Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price
Balance at January 31, 2015		47,140		$	13.79		2,232		$	15.43		49,372		$	13.88
Granted		80		$	16.13		—		$	—		80		$	16.13
Exercised		(1,243	)	$	10.47		—		$	—		(1,243	)	$	10.47
Canceled/Forfeited		(2,486	)	$	17.80		(8	)	$	15.43		(2,494	)	$	17.80

Balance at May 2, 2015		43,491		$	13.66		2,224		$	15.43		45,715		$	13.75

Vested or expected to vest at May 2, 2015		41,184		$	13.70

Exercisable at May 2, 2015		25,511		$	14.39

For time-based stock options vested and expected to vest at May 2, 2015, the aggregate intrinsic value was $86.8 million and the weighted average remaining contractual term was 5.9 years. For time-based stock options exercisable at May 2, 2015, the aggregate intrinsic value was $53.4 million and the weighted average remaining contractual term was 4.5 years. The aggregate intrinsic value of stock options exercised during the three months ended May 2, 2015 and May 3, 2014 was $6.3 million and $9.4 million, respectively. There was no aggregate intrinsic value for market-based stock options at May 2, 2015 and the weighted average remaining contractual term of market-based stock options expected to reach the end of the vesting period at May 2, 2015 was 6.0 years. The Company’s closing stock price of $14.30 as reported on the NASDAQ Global Select Market for all in-the-money options as of May 1, 2015 was used to calculate the aggregate intrinsic value.

As of May 2, 2015, the unamortized compensation expense for time-based stock options was $46.6 million and market-based stock options were fully amortized in fiscal 2015. The unamortized compensation expense for time-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.

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


	Time-Based					Performance-Based					Market-Based				Total
	Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value
Balance at January 31, 2015		9,748		$	14.84		1,254		$	14.99		—	$	—		11,002		$	14.85
Granted		4,742		$	13.67		669		$	14.28		407	$	12.24		5,818		$	13.64
Vested		(4,333	)	$	15.39		(658	)	$	15.15		—	$	—		(4,991	)	$	15.36
Canceled/Forfeited		(146	)	$	14.09		(79	)	$	14.32		—	$	—		(225	)	$	14.17

Balance at May 2, 2015		10,011		$	14.06		1,186		$	14.54		407	$	12.24		11,604		$	14.04

In connection with the performance-based equity awards granted in fiscal 2015 to each of the Company’s executive officers, a total of 478,001 shares vested on April 1, 2015 in connection with the first performance period completed at the end of fiscal 2015. Of this amount, an additional 107,954 shares are included as granted in the table above for the three months ended May 2, 2015 since each executive officer achieved greater than their target shares for one of the financial performance goals. The amount of canceled shares reported in the table above includes the portion of unvested shares that were not earned since performance achievements on each executive officer’s other financial and strategic performance goals were not fully achieved. As of May 2, 2015, the Company determined the performance goals established for the second performance period to be completed at the end of fiscal 2016 would not be achieved and adjusted the related share-based compensation expense accordingly for the three months ended May 2, 2015.

In April 2015, the Company granted performance-based equity awards to each of its executive officers which are based on their achievement of certain performance goals for a new performance period beginning in fiscal 2016. These equity awards include restricted stock units which vest based on the achievement of certain financial goals (“Financial Performance RSU”), and performance awards for which a portion shall vest based on the achievement of individual strategic objectives (“Strategic Objective Award”) and a portion shall vest based on total shareholder return (“Total Shareholder Return Award”). These awards are reported in the above table as “Performance-Based,” except for the Total Shareholder Return Award which is reported as “Market-Based.” The Financial Performance RSUs will be earned based on the achievement of revenue and modified non-GAAP operating income that have been established at “threshold,” “target” and “maximum” levels and will vest on the first anniversary of the commencement date. The Strategic Objective Award will vest on the first anniversary of the commencement date at the target level based on the achievement of individual strategic goals and either the revenue or modified non-GAAP operating income objective established for the Financial Performance RSU. The Total Shareholder Return Award will vest on the second anniversary of the commencement date based the Company’s stock price performance in comparison to the Philadelphia Semiconductor Sector Index. Share-based compensation for the Total Shareholder Award is measured using the Monte Carlo valuation method since the award is indexed to the price of the Company’s common stock as set forth under the terms of the award.

In connection with the performance-based restricted stock units granted in fiscal 2015 to certain members of senior management, final evaluation for each individual’s achievement of their performance was measured during the three months ended May 2, 2015. As a result, a total of 360,723 shares vested on April 1, 2015 and are included in the above table. There was no material adjustment to share-based compensation expense related to these performance-based restricted stock units in the three months ended May 2, 2015. The amount of canceled shares reported in the table above includes the portion of unvested shares that were not earned since certain performance achievements were not fully achieved.

The aggregate intrinsic value of restricted stock units expected to vest as of May 2, 2015 was $150.2 million. The number of restricted stock units that are expected to vest is 10.5 million shares.

As of May 2, 2015, unamortized compensation expense related to restricted stock units was $134.0 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 1.7 years.

Employee Stock Purchase Plan

During the three months ended May 2, 2015 and May 3, 2014, the Company issued no shares under the 2000 Employee Stock Purchase Plan, as amended and restated (the “ESPP”). As of May 2, 2015, there was $33.7 million of unrecognized compensation cost related to the ESPP.

Share Repurchase Program

The Company repurchased 1.4 million of its common shares for $22.1 million during the three months ended May 2, 2015. The Company had no repurchases of its common shares during the three months ended May 3, 2014. The repurchased shares were retired immediately after the repurchases were completed. The Company records all repurchases, as well as investment purchases and sales, based on trade date. As of May 2, 2015, a total of 223.3 million cumulative shares have been repurchased under the Company’s share repurchase program for a total $2.8 billion in cash and there was $421.4 million remaining available for future share repurchases.

Subsequent to the end of the quarter through May 28, 2015, the Company repurchased an additional 0.9 million of its common shares for $12.9 million at an average price per share of $13.84.

Dividends

The Company paid the following cash dividends:


	Three Months Ended
	May 2, 2015		May 3, 2014
Cash dividend per share	$	0.06	$	0.06

Total payment to shareholders (in thousands)	$	30,910	$	30,172

Future payment of a regular quarterly cash dividend on the Company’s common shares will be subject to, among other things, the best interests of the Company, the Company’s results of operations, cash balances and future cash requirements, financial condition, statutory requirements under Bermuda law and other factors that the Company’s board of directors may deem relevant. The Company’s dividend payments may change from time to time, and the Company cannot provide assurance that it will continue to declare dividends at all or in any particular amounts. In addition, developments in ongoing litigation could affect the Company’s ability to make a dividend payment on a declared payment date until such time as the Company can meet statutory requirements under Bermuda law.

On May 21, 2015, the Company announced that its board of directors declared a cash dividend of $0.06 per share to be paid on July 1, 2015 to shareholders of record as of June 11, 2015.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Article 4

Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Share-Based Compensation

3 Months Ended

May 02, 2015

Share-Based Compensation

Note 12. Share-Based Compensation

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


	Three Months Ended
	May 2, 2015		May 3, 2014
Cost of goods sold	$	1,547	$	2,299
Research and development		24,781		20,368
Selling and marketing		2,577		2,928
General and administrative		4,316		4,374

	$	33,221	$	29,969

Share-based compensation capitalized in inventory was $1.9 million at May 2, 2015 and $1.5 million at January 31, 2015.

Valuation Assumptions

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


	Three Months Ended
	May 2, 2015			May 3, 2014
Time-based Stock Options:
Weighted average fair value	$	4.54		$	4.64
Expected volatility		34	%		36	%
Expected term (in years)		5.4			5.0
Risk-free interest rate		1.5	%		1.6	%
Expected dividend yield		1.6	%		1.6	%


	Three Months Ended
	May 2, 2015
Total Shareholder Return Awards:
Expected term (in years)		2.0
Expected volatility		27	%
Average correlation coefficient of peer companies		0.4	%
Risk-free interest rate		0.5	%
Expected dividend yield		1.7	%

Under the ESPP, there were no stock purchase rights granted in the three months ended May 2, 2015 and May 3, 2014.

Related Party Transaction

3 Months Ended

May 02, 2015

Related Party Transaction

Note 13. Related Party Transaction

On February 25, 2015, the Executive Compensation Committee (“Committee”) of the Company’s Board of Directors approved a cash payment of approximately $15.4 million to Dr. Sehat Sutardja, the Company’s Chief Executive Officer which was recorded in general and administrative expense in the three months ended May 2, 2015. The U.S. Court of Federal Claims ruled against Dr. Sutardja in his legal challenge with the Internal Revenue Service and the California Franchise Tax Board related to the tax treatment of several stock options granted in fiscal 2004. After discussing and evaluating the alternatives to a continuing legal challenge of the court’s determination, the likelihood of success of further appeal by Dr. Sutardja and the potential negative impact on the Company of a continuation of the case regardless of the outcome, on February 25, 2015, the Committee determined to provide Dr. Sutardja with relief from the financial effects of the penalty taxes. Accordingly, the Committee approved the cash payment to Dr. Sutardja equal to the amount of his penalty taxes owed under the Tax Codes, plus accrued interest owed with respect to such liabilities, all grossed-up for income taxes that will be owed by Dr. Sutardja on receipt of such cash payment. The Company paid $8.4 million to Dr. Sutardja in the three months ended May 2, 2015 representing reimbursement for the U.S. federal tax portion. As of May 2, 2015, the Company had a remaining $7.0 million liability to Dr. Sutardja.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References + Details

The Company and Basis of Presentation (Policies)	3 Months Ended
The Company and Basis of Presentation (Policies)	May 02, 2015
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 2016 and 2015 each have a 52-week period. The unaudited 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 balance sheet as of May 2, 2015, the results of its operations for the three months ended May 2, 2015 and May 3, 2014, its comprehensive income for the three months ended May 2, 2015 and May 3, 2014, and its cash flows for the three months ended May 2, 2015 and May 3, 2014. The January 31, 2015 condensed consolidated balance sheet data was derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 31, 2015, but does not include all disclosures required for annual periods. 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 fiscal year ended January 31, 2015 as filed on March 26, 2015 with the Securities and Exchange Commission. The results of operations for the three months ended May 2, 2015 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 ongoing basis, the Company evaluates its estimates, including those related to performance-based compensation, revenue recognition, provisions for sales returns and allowances, inventory excess and obsolescence, investment fair values, goodwill and other intangible assets, restructuring, 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 share-based awards that are granted. 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 U.S. dollar.
Accounting Pronouncements Recently Adopted	*Accounting Pronouncements Recently Adopted* In April 2014, the Financial Accounting Standards Board (“FASB”) issued an amendment to its guidance regarding the reporting requirements of discontinued operations, which is effective for the Company beginning in the first quarter of fiscal 2016. As a result, the Company has adopted and will apply the new guidance for any future dispositions that meet the criteria of a discontinued operation under the amendment.
Accounting Pronouncements Not Yet Effective	*Accounting Pronouncements Not Yet Effective* In April 2015, the FASB issued new guidance to help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement. The guidance provides a basis for evaluating whether a cloud computing arrangement includes a software license or whether the arrangement should be accounted for as a service contract. The guidance is effective for annual and interim reporting periods beginning after December 15, 2015. The Company is currently evaluating the effect this new guidance will have on its consolidated financial statements. In May 2014, the FASB issued a new standard on the recognition of revenue from contracts with customers, which will supersede nearly all existing revenue recognition guidance under GAAP. Under the new standard, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additional disclosures regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, and assets recognized from costs incurred to obtain or fulfill a contract will also be required. The standard is effective for the Company’s first quarter of fiscal 2018 and allows for either full retrospective or modified retrospective adoption. Early adoption is not permitted. The Company is currently evaluating the effects of the new guidance and has not yet selected a transition method nor has it determined the potential effects of adoption on its financial statements.

Investments (Tables)

3 Months Ended

May 02, 2015

Schedule of Available-for-sale Securities Reconciliation

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


	May 2, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	1,036,538	$	2,599	$	(905	)	$	1,038,232
U.S. government and agency debt		269,845		179		(39	)		269,985
Asset backed securities		100,422		79		(13	)		100,488
Foreign government and agency debt		16,959		11		(6	)		16,964
Municipal debt securities		36,511		31		(27	)		36,515

Total short-term investments		1,460,275		2,899		(990	)		1,462,184
Long-term investments:
Available-for-sale:
Auction rate securities		12,500		—		(2,389	)		10,111

Total long-term investments		12,500		—		(2,389	)		10,111

Total investments	$	1,472,775	$	2,899	$	(3,379	)	$	1,472,295


	January 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	983,008	$	3,872	$	(563	)	$	986,317
U.S. government and agency debt		178,898		265		(7	)		179,156
Asset backed securities		91,432		108		(9	)		91,531
Foreign government and agency debt		28,051		61		(2	)		28,110
Municipal debt securities		33,421		47		(4	)		33,464

Total short-term investments		1,314,810		4,353		(585	)		1,318,578
Long-term investments:
Available-for-sale:
Auction rate securities		12,500		—		(2,274	)		10,226

Total long-term investments		12,500		—		(2,274	)		10,226

Total investments	$	1,327,310	$	4,353	$	(2,859	)	$	1,328,804

Gross Realized Gains and Losses on Sale of Available-for-Sales Securities

Gross realized gains and gross realized losses on sales of available-for-sales securities are presented in the following table (in thousands):


	Three Months Ended
	May 2, 2015			May 3, 2014
Gross realized gains	$	443		$	472
Gross realized losses		(107	)		(25	)

Total net realized gains	$	336		$	447

Investments Classified by Contractual Maturity Date

The contractual maturities of available-for-sale securities are presented in the following table (in thousands):


	May 2, 2015				January 31, 2015
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	372,927	$	373,005	$	361,108	$	361,396
Due between one and five years		1,078,275		1,080,123		950,702		954,151
Due over five years		21,573		19,167		15,500		13,257

	$	1,472,775	$	1,472,295	$	1,327,310	$	1,328,804

Unrealized Loss Position Investments


	May 2, 2015
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	368,427	$	(875	)	$	4,959	$	(30	)	$	373,386	$	(905	)
U.S. government and agency debt		80,502		(39	)		—		—			80,502		(39	)
Asset backed securities		27,098		(13	)		—		—			27,098		(13	)
Foreign government and agency debt		11,922		(6	)		—		—			11,922		(6	)
Municipal debt securities		12,341		(27	)		—		—			12,341		(27	)
Auction rate securities		—		—			10,111		(2,389	)		10,111		(2,389	)

Total securities	$	500,290	$	(960	)	$	15,070	$	(2,419	)	$	515,360	$	(3,379	)


	January 31, 2015
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	243,699	$	(558	)	$	2,005	$	(5	)	$	245,704	$	(563	)
U.S. government and agency debt		32,165		(7	)		—		—			32,165		(7	)
Asset backed securities		25,053		(9	)		—		—			25,053		(9	)
Foreign government and agency debt		2,999		(2	)		—		—			2,999		(2	)
Municipal debt securities		2,845		(4	)		—		—			2,845		(4	)
Auction rate securities		—		—			10,226		(2,274	)		10,226		(2,274	)

Total securities	$	306,761	$	(580	)	$	12,231	$	(2,279	)	$	318,992	$	(2,859	)

Supplemental Financial Information (Tables)

3 Months Ended

May 02, 2015

Schedule of Inventory, Current


	May 2, 2015		January 31, 2015
Inventories:
Work-in-process	$	187,249	$	183,869
Finished goods		152,610		124,293

Total inventories	$	339,859	$	308,162

Property, Plant and Equipment


	May 2, 2015			January 31, 2015
Property and equipment, net:
Machinery and equipment	$	610,076		$	601,961
Buildings		144,320			144,320
Computer software		101,304			99,312
Land		53,373			53,373
Building improvements		49,800			49,753
Leasehold improvements		51,496			51,434
Furniture and fixtures		28,007			27,883
Construction in progress		2,323			6,167

		1,040,699			1,034,203
Less: Accumulated depreciation and amortization		(714,945	)		(693,564	)

Total property and equipment, net	$	325,754		$	340,639

Schedule of Other Assets, Noncurrent

	May 2, 2015		January 31, 2015
Other non-current assets:
Technology and other licenses	$	55,445	$	61,217
Deferred tax assets		22,297		22,273
Investments in privately-held companies		9,267		9,267
Prepaid land use rights		13,355		13,432
Deposits		8,144		7,903
Other		14,347		14,747

Total other non-current assets	$	122,855	$	128,839

Schedule of Accrued Liabilities


	May 2, 2015		January 31, 2015
Accrued liabilities:
Accrued rebates	$	31,685	$	39,105
Accrued royalties		22,675		24,680
Technology license obligations		13,677		14,428
Accrued legal expense		6,951		10,027
Other		42,812		43,148

Total accrued liabilities	$	117,800	$	131,388

Other Noncurrent Liabilities


	May 2, 2015		January 31, 2015
Other non-current liabilities:
Technology license obligations	$	14,625	$	16,468
Long-term accrued employee compensation		4,890		4,610
Other		8,753		11,115

Other non-current liabilities	$	28,268	$	32,193

Changes in Accumulated Other Comprehensive Income by Component

The changes in accumulated other comprehensive income by component are presented in the following tables (in thousands):


	Unrealized Gain (Loss) on Marketable Securities			Unrealized Gain (Loss) on Auction Rate Securities			Unrealized Gain (Loss) on Cash Flow Hedges			Total
Balance at January 31, 2015	$	3,768		$	(2,274	)	$	(1,186	)	$	308
Other comprehensive income before reclassifications		(1,528	)		(115	)		803			(840	)
Amounts reclassified from accumulated other comprehensive income		(332	)		—			944			612

Other comprehensive income (loss)		(1,860	)		(115	)		1,747			(228	)

Balance at May 2, 2015	$	1,908		$	(2,389	)	$	561		$	80


	Unrealized Gain (Loss) on Marketable Securities			Unrealized Gain (Loss) on Auction Rate Securities			Unrealized Gain (Loss) on Cash Flow Hedges			Total
Balance at February 1, 2014	$	2,534		$	(2,871	)	$	934		$	597
Other comprehensive income before reclassifications		798			177			42			1,017
Amounts reclassified from accumulated other comprehensive income		(420	)		—			(785	)		(1,205	)

Other comprehensive income (loss)		378			177			(743	)		(188	)

Balance at May 3, 2014	$	2,912		$	(2,694	)	$	191		$	409

Amounts Reclassified from Accumulated Other Comprehensive Income by Component

The amounts reclassified from accumulated other comprehensive income by component are presented in the following table (in thousands):


	Three Months Ended
Affected Line Item in the Statement of Operations	May 2, 2015			May 3, 2014
Interest and other income, net:
Available-for-sale securities:
Marketable securities	$	332		$	420
Cash flow hedges:
Research and development		(864	)		721
Selling and marketing		(67	)		62
General and administrative		(13	)		2

Total	$	(612	)	$	1,205

Interest and Other Income, Net

Consolidated Statement of Operations


	Three Months Ended
	May 2, 2015			May 3, 2014
Interest and other income, net:
Interest income	$	4,077		$	2,609
Realized gain on investments		336			447
Currency translation gain (loss)		407			(1,025	)
Other income		567			219
Interest expense		(220	)		(325	)

	$	5,167		$	1,925

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
	May 2, 2015		May 3, 2014
Numerator:
Net income	$	14,090	$	99,479

Denominator:
Weighted average shares — basic		516,228		505,105
Effect of dilutive securities:
Share-based awards		10,939		15,646

Weighted average shares — diluted		527,167		520,751

Net income per share:
Basic	$	0.03	$	0.20
Diluted	$	0.03	$	0.19

Anti-dilutive potential shares are presented in the following table:


	Three Months Ended
	May 2, 2015		May 3, 2014
Weighted average shares outstanding from stock options:
Time-based options		19,615		19,069
Market-based options		2,232		2,384

		21,847		21,453

Weighted average exercise price:
Time-based options	$	17.64	$	18.17

Market-based options	$	15.43	$	15.43

Total	$	17.41	$	17.86

Derivative Financial Instruments (Tables)

3 Months Ended

May 02, 2015

Schedule of Derivative Instruments

The notional amounts of outstanding forward contracts were as follows (in thousands):


	Buy Contracts
	May 2, 2015		January 31, 2015
Israeli shekel	$	34,984	$	51,326

Information about Gains (Losses) Associated with Derivative Financial Instruments

The following table provides information about gains (losses) associated with the Company’s derivative financial instruments (in thousands):


	Location of Gains (Losses) in Statement of Operations	Amount of Gains (Losses) in Statement of Operations for the three months ended
	Location of Gains (Losses) in Statement of Operations	May 2, 2015			May 3, 2014
Derivatives designated as cash flow hedges:
Forward contracts:	Research and development	$	(991	)	$	598
	Selling and marketing		(77	)		52
	General and administrative		(14	)		2

		$	(1,082	)	$	652

- 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 5
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41641-113959

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=35706170&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 8
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959

Reference 4: 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=35706170&loc=d3e41638-113959

Reference 5: 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=35706170&loc=SL5580258-113959

Reference 6: 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=35706170&loc=SL5579245-113959

Reference 7: 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=35706170&loc=SL5624171-113959

Reference 8: 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

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579240-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41620-113959

Reference 11: 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=26873400&loc=d3e23780-122690

+ Details

Fair Value Measurements (Tables)

3 Months Ended

May 02, 2015

Fair Value, Assets Measured on Recurring Basis


	Fair Value Measurements at May 2, 2015
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
U.S. government and agency debt	$	1,000	$	—	$	—	$	1,000
Money market funds		875		—		—		875
Time deposits		—		183,468		—		183,468
Corporate debt securities		—		20,004		—		20,004
Short-term investments:
U.S. government and agency debt		269,985		—		—		269,985
Corporate debt securities		—		1,038,232		—		1,038,232
Asset backed securities		—		100,488		—		100,488
Foreign government and agency debt		—		16,964		—		16,964
Municipal debt securities		—		36,515		—		36,515
Prepaid expenses and other current assets:
Foreign currency forward contracts		—		702		—		702
Long-term investments:
Auction rate securities		—		—		10,111		10,111
Other non-current assets:
Severance pay fund		—		1,842		—		1,842

Total assets	$	271,860	$	1,398,215	$	10,111	$	1,680,186

Liabilities
Accrued liabilities:
Foreign currency forward contracts	$	—	$	193	$	—	$	193


	Fair Value Measurements at January 31, 2015
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	111,286	$	—	$	—	$	111,286
Time deposits		—		213,012		—		213,012
Corporate debt securities		—		21,999		—		21,999
Short-term investments:
U.S. government and agency debt		179,156		—		—		179,156
Corporate debt securities		—		986,317		—		986,317
Asset backed securities		—		91,531		—		91,531
Foreign government and agency debt		—		28,110		—		28,110
Municipal debt securities		—		33,464		—		33,464
Prepaid expenses and other current assets:
Foreign currency forward contracts		—		124		—		124
Long-term investments:
Auction rate securities		—		—		10,226		10,226
Other non-current assets:
Severance pay fund		—		1,758		—		1,758

Total assets	$	290,442	$	1,376,315	$	10,226	$	1,676,983

Liabilities
Accrued liabilities:
Foreign currency forward contracts	$	—	$	1,379	$	—	$	1,379

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

The following table summarizes the change in fair value for Level 3 assets (in thousands):


	Three Months Ended
	May 2, 2015			May 3, 2014
Beginning balance	$	10,226		$	16,279
Sales and redemptions		—			(3,000	)
Unrealized losses included in accumulated other comprehensive income		(115	)		177

Ending balance	$	10,111		$	13,456

Acquired Intangible Assets, Net (Tables)

3 Months Ended

May 02, 2015

Schedule of Finite-Lived Intangible Assets by Major Class

The carrying amount of acquired intangible assets, net, are as follows (in thousands):


		May 2, 2015							January 31, 2015
	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	4 - 7 years	$	35,498	$	(17,240	)	$	18,258	$	35,498	$	(15,684	)	$	19,814
Core technology	5 - 8 years		850		(465	)		385		850		(423	)		427
Trade names	5 years		1,300		(893	)		407		1,300		(828	)		472
Customer intangibles	5 - 7 years		28,600		(20,005	)		8,595		28,600		(18,615	)		9,985

Total intangible assets, net		$	66,248	$	(38,603	)	$	27,645	$	66,248	$	(35,550	)	$	30,698

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Based on the identified intangible assets recorded at May 2, 2015, the future amortization expense for the next five fiscal years is as follows (in thousands):


Fiscal Year
Remainder of fiscal 2016	$	9,159
2017		11,027
2018		5,599
2019		1,860
2020		—

	$	27,645

Restructuring (Tables)

3 Months Ended

May 02, 2015

Schedule of Restructuring Reserve by Type of Cost

The following table presents detail of the related restructuring charges recorded by the Company (in thousands):


	Three Months Ended
	May 2, 2015		May 3, 2014
Severance and related costs	$	—	$	4,617
Facilities and related costs		19		444
Other exit-related costs		—		10

		19		5,071
Impairment loss and write-off of assets:
Equipment		573		17
Acquired intangible asset		—		3,386

	$	592	$	8,474

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


	Three Months Ended
	May 2, 2015		May 3, 2014
Research and development	$	—	$	4,682
Selling and marketing		—		48
General and administrative		592		358
Write-off of acquired intangible assets		—		3,386

	$	592	$	8,474

Reconciliation of Beginning and Ending Restructuring Liability Balances by Major Type of Costs

The following table sets forth a reconciliation of the beginning and ending restructuring liability balances by each major type of costs associated with the restructuring charges (in thousands):


	Facilities and Related Costs			Other Exit-Related Costs			Total
Balance at January 31, 2015	$	1,339		$	3,230		$	4,569
Restructuring charges		19			—			19
Net cash payments		(312	)		(3,230	)		(3,542	)

Balance at May 2, 2015	$	1,046		$	—		$	1,046

Shareholders' Equity (Tables)

3 Months Ended

May 02, 2015

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

Stock option activity under the Company’s stock option and stock incentive plans is included in the following table (in thousands, except per share amounts):


	Time-Based Options					Market-Based Options					Total
	Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price
Balance at January 31, 2015		47,140		$	13.79		2,232		$	15.43		49,372		$	13.88
Granted		80		$	16.13		—		$	—		80		$	16.13
Exercised		(1,243	)	$	10.47		—		$	—		(1,243	)	$	10.47
Canceled/Forfeited		(2,486	)	$	17.80		(8	)	$	15.43		(2,494	)	$	17.80

Balance at May 2, 2015		43,491		$	13.66		2,224		$	15.43		45,715		$	13.75

Vested or expected to vest at May 2, 2015		41,184		$	13.70

Exercisable at May 2, 2015		25,511		$	14.39

Schedule of Nonvested Share Activity

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


	Time-Based					Performance-Based					Market-Based				Total
	Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value
Balance at January 31, 2015		9,748		$	14.84		1,254		$	14.99		—	$	—		11,002		$	14.85
Granted		4,742		$	13.67		669		$	14.28		407	$	12.24		5,818		$	13.64
Vested		(4,333	)	$	15.39		(658	)	$	15.15		—	$	—		(4,991	)	$	15.36
Canceled/Forfeited		(146	)	$	14.09		(79	)	$	14.32		—	$	—		(225	)	$	14.17

Balance at May 2, 2015		10,011		$	14.06		1,186		$	14.54		407	$	12.24		11,604		$	14.04

Schedule of Cash Dividends

The Company paid the following cash dividends:


	Three Months Ended
	May 2, 2015		May 3, 2014
Cash dividend per share	$	0.06	$	0.06

Total payment to shareholders (in thousands)	$	30,910	$	30,172

Share-Based Compensation (Tables)

3 Months Ended

May 02, 2015

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

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


	Three Months Ended
	May 2, 2015		May 3, 2014
Cost of goods sold	$	1,547	$	2,299
Research and development		24,781		20,368
Selling and marketing		2,577		2,928
General and administrative		4,316		4,374

	$	33,221	$	29,969

Employee Stock Purchase Plan

Weighted Average Assumptions Used to Calculate Fair Value Awards


	Three Months Ended
	May 2, 2015
Total Shareholder Return Awards:
Expected term (in years)		2.0
Expected volatility		27	%
Average correlation coefficient of peer companies		0.4	%
Risk-free interest rate		0.5	%
Expected dividend yield		1.7	%

Time Based Option Award

Weighted Average Assumptions Used to Calculate Fair Value Awards


	Three Months Ended
	May 2, 2015			May 3, 2014
Time-based Stock Options:
Weighted average fair value	$	4.54		$	4.64
Expected volatility		34	%		36	%
Expected term (in years)		5.4			5.0
Risk-free interest rate		1.5	%		1.6	%
Expected dividend yield		1.6	%		1.6	%

Summary of Investments (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 1,472,775	$ 1,327,310
Gross Unrealized Gains	2,899	4,353
Gross Unrealized Losses	(3,379)	(2,859)
Estimated Fair Value	1,472,295	1,328,804
Short-term Investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	1,460,275	1,314,810
Gross Unrealized Gains	2,899	4,353
Gross Unrealized Losses	(990)	(585)
Estimated Fair Value	1,462,184	1,318,578
Short-term Investments \| Corporate debt securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	1,036,538	983,008
Gross Unrealized Gains	2,599	3,872
Gross Unrealized Losses	(905)	(563)
Estimated Fair Value	1,038,232	986,317
Short-term Investments \| U.S. government and agency debt
Gain (Loss) on Investments [Line Items]
Amortized Cost	269,845	178,898
Gross Unrealized Gains	179	265
Gross Unrealized Losses	(39)	(7)
Estimated Fair Value	269,985	179,156
Short-term Investments \| Asset-backed Securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	100,422	91,432
Gross Unrealized Gains	79	108
Gross Unrealized Losses	(13)	(9)
Estimated Fair Value	100,488	91,531
Short-term Investments \| Foreign government and agency debt
Gain (Loss) on Investments [Line Items]
Amortized Cost	16,959	28,051
Gross Unrealized Gains	11	61
Gross Unrealized Losses	(6)	(2)
Estimated Fair Value	16,964	28,110
Short-term Investments \| Municipal debt securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	36,511	33,421
Gross Unrealized Gains	31	47
Gross Unrealized Losses	(27)	(4)
Estimated Fair Value	36,515	33,464
Long-term investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	12,500	12,500
Gross Unrealized Losses	(2,389)	(2,274)
Estimated Fair Value	10,111	10,226
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	12,500	12,500
Gross Unrealized Losses	(2,389)	(2,274)
Estimated Fair Value	$ 10,111	$ 10,226

Investments - Additional Information (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 1,472,775	$ 1,327,310
Gross Unrealized Losses	3,379	2,859
Cash, cash equivalents and short-term investments	2,500,000
Long-term investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	12,500	12,500
Gross Unrealized Losses	2,389	2,274
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	12,500	12,500
Gross Unrealized Losses	$ 2,389	$ 2,274

- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References + Details

Gross Realized Gains and Losses on Sale of Available-for-Sales Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	$ 443	$ 472
Gross realized losses	(107)	(25)
Total net realized gains	$ 336	$ 447

Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Amortized Cost
Due in one year or less	$ 372,927	$ 361,108
Due between one and five years	1,078,275	950,702
Due over five years	21,573	15,500
Amortized Cost	1,472,775	1,327,310
Estimated Fair Value
Due in one year or less	373,005	361,396
Due between one and five years	1,080,123	954,151
Due over five years	19,167	13,257
Estimated Fair Value	$ 1,472,295	$ 1,328,804

Summary of Investments Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 500,290	$ 306,761
Less than 12 months Unrealized Losses	(960)	(580)
12 months or more Fair Value	15,070	12,231
12 months or more Unrealized Losses	(2,419)	(2,279)
Total Fair Value	515,360	318,992
Total Unrealized Losses	(3,379)	(2,859)
Corporate debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	368,427	243,699
Less than 12 months Unrealized Losses	(875)	(558)
12 months or more Fair Value	4,959	2,005
12 months or more Unrealized Losses	(30)	(5)
Total Fair Value	373,386	245,704
Total Unrealized Losses	(905)	(563)
U.S. government and agency debt
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	80,502	32,165
Less than 12 months Unrealized Losses	(39)	(7)
Total Fair Value	80,502	32,165
Total Unrealized Losses	(39)	(7)
Asset-backed Securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	27,098	25,053
Less than 12 months Unrealized Losses	(13)	(9)
Total Fair Value	27,098	25,053
Total Unrealized Losses	(13)	(9)
Foreign government and agency debt
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	11,922	2,999
Less than 12 months Unrealized Losses	(6)	(2)
Total Fair Value	11,922	2,999
Total Unrealized Losses	(6)	(2)
Municipal debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	12,341	2,845
Less than 12 months Unrealized Losses	(27)	(4)
Total Fair Value	12,341	2,845
Total Unrealized Losses	(27)	(4)
Auction rate securities
Investments, Unrealized Loss Position [Line Items]
12 months or more Fair Value	10,111	10,226
12 months or more Unrealized Losses	(2,389)	(2,274)
Total Fair Value	10,111	10,226
Total Unrealized Losses	$ (2,389)	$ (2,274)

Inventories (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Inventory [Line Items]
Work-in-process	$ 187,249	$ 183,869
Finished goods	152,610	124,293
Total inventories	$ 339,859	$ 308,162

Property and Equipment Net (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,040,699	$ 1,034,203
Less: Accumulated depreciation	(714,945)	(693,564)
Property and equipment, net	325,754	340,639
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	610,076	601,961
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	144,320	144,320
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	101,304	99,312
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	53,373	53,373
Building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	49,800	49,753
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51,496	51,434
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,007	27,883
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,323	$ 6,167

Other Non Current Assets (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Technology and other licenses	$ 55,445	$ 61,217
Deferred tax assets	22,297	22,273
Investments in privately-held companies	9,267	9,267
Prepaid land use rights	13,355	13,432
Deposits	8,144	7,903
Other	14,347	14,747
Other non-current assets	$ 122,855	$ 128,839

Accrued Liabilities (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Schedule of Accrued Liabilities [Line Items]
Accrued rebates	$ 31,685	$ 39,105
Accrued royalties	22,675	24,680
Technology license obligations	13,677	14,428
Accrued legal expense	6,951	10,027
Other	42,812	43,148
Accrued liabilities	$ 117,800	$ 131,388

Other Long Term Liabilities (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Schedule of Other Liabilities [Line Items]
Technology license obligations	$ 14,625	$ 16,468
Long-term accrued employee compensation	4,890	4,610
Other	8,753	11,115
Other non-current liabilities	$ 28,268	$ 32,193

Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 308	$ 597
Other comprehensive income before reclassifications	(840)	1,017
Amounts reclassified from accumulated other comprehensive income	612	(1,205)
Other comprehensive income (loss)	(228)	(188)
Ending Balance	80	409
Unrealized Gain (Loss) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	3,768	2,534
Other comprehensive income before reclassifications	(1,528)	798
Amounts reclassified from accumulated other comprehensive income	(332)	(420)
Other comprehensive income (loss)	(1,860)	378
Ending Balance	1,908	2,912
Unrealized(Loss) on Auction Rate Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,274)	(2,871)
Other comprehensive income before reclassifications	(115)	177
Other comprehensive income (loss)	(115)	177
Ending Balance	(2,389)	(2,694)
Unrealized Gain (Loss) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,186)	934
Other comprehensive income before reclassifications	803	42
Amounts reclassified from accumulated other comprehensive income	944	(785)
Other comprehensive income (loss)	1,747	(743)
Ending Balance	$ 561	$ 191

- 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

Amounts Reclassified from Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other income, net	$ 5,167	$ 1,925
Research and development	(280,114)	(295,363)
Selling and marketing	(36,174)	(38,358)
General and administrative	(41,027)	(30,573)
Net income	14,090	99,479
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(612)	1,205
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Gain (Loss) on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other income, net	332	420
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Gain (Loss) on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Research and development	(864)	721
Selling and marketing	(67)	62
General and administrative	$ (13)	$ 2

- Definition

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

+ References + Details

Interest and Other Income Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Interest and Other Income [Line Items]
Interest income	$ 4,077	$ 2,609
Realized gain on investments	336	447
Currency translation gain (loss)	407	(1,025)
Other income	567	219
Interest expense	(220)	(325)
Interest and other income, net	$ 5,167	$ 1,925

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References + Details

Computations of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Numerator:
Net income	$ 14,090	$ 99,479
Denominator:
Weighted average shares - basic	516,228	505,105
Effect of dilutive securities:
Share-based awards	10,939	15,646
Weighted average shares - diluted	527,167	520,751
Basic	$ 0.03	$ 0.20
Diluted	$ 0.03	$ 0.19
Time-based options
Effect of dilutive securities:
Weighted average shares outstanding from stock options	19,615	19,069
Weighted average exercise price	$ 17.64	$ 18.17
Market Based Option Award
Effect of dilutive securities:
Weighted average shares outstanding from stock options	2,232	2,384
Weighted average exercise price	$ 15.43	$ 15.43
Stock Options
Effect of dilutive securities:
Weighted average shares outstanding from stock options	21,847	21,453
Weighted average exercise price	$ 17.41	$ 17.86

Notional Amounts of Outstanding Foreign Currency Forward Contracts (Detail) - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Foreign Exchange Buy Contracts \| Israeli shekel
Derivative [Line Items]
Derivative, notional amount	$ 34,984	$ 51,326

Information about Gains (Losses) Associated with Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ (1,082)	$ 652
Cash flow hedges \| Foreign currency forward contracts \| Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	(991)	598
Cash flow hedges \| Foreign currency forward contracts \| Selling and marketing
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	(77)	52
Cash flow hedges \| Foreign currency forward contracts \| General and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ (14)	$ 2

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended
	May 02, 2015	May 03, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash flow hedges were terminated as a result of forecasted transactions that did not occur	$ 0
Not Designated as Hedging Instrument \| Foreign currency forward contracts \| Nonoperating Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Portion of gains excluded from the assessment of hedge effectiveness	$ 0	$ 0

Fair Value Measurements - Additional Information (Detail) $ in Millions	May 02, 2015 USD ($)
Fair Value, Measurement Inputs, Disclosure [Line Items]
Percentage of total amount of assets measured using Level 3 valuation methodologies to total assets	0.20%
Carrying value of equipment held for sale	$ 10.2

Financial Assets that were Accounted for at Fair Value (Detail) - Items measured at fair value - USD ($) $ in Thousands	May 02, 2015	Jan. 31, 2015
Assets
Total assets	$ 1,680,186	$ 1,676,983
Other non-current assets \| Severance Pay Fund
Assets
Other non-current asset	1,842	1,758
Foreign currency forward contracts
Liabilities
Accrued liabilities	193	1,379
Foreign currency forward contracts \| Prepaid expenses and other current assets
Assets
Prepaid expenses and other current assets	702	124
Cash equivalents \| U.S. government and agency debt
Assets
Cash equivalents	1,000
Cash equivalents \| Money market funds
Assets
Cash equivalents	875	111,286
Cash equivalents \| Time deposits
Assets
Cash equivalents	183,468	213,012
Cash equivalents \| Corporate debt securities
Assets
Cash equivalents	20,004	21,999
Short-term Investments \| U.S. government and agency debt
Assets
Investments	269,985	179,156
Short-term Investments \| Corporate debt securities
Assets
Investments	1,038,232	986,317
Short-term Investments \| Asset-backed Securities
Assets
Investments	100,488	91,531
Short-term Investments \| Foreign government and agency debt
Assets
Investments	16,964	28,110
Short-term Investments \| Municipal debt securities
Assets
Investments	36,515	33,464
Long-term investments \| Auction rate securities
Assets
Investments	10,111	10,226
Level 1
Assets
Total assets	271,860	290,442
Level 1 \| Cash equivalents \| U.S. government and agency debt
Assets
Cash equivalents	1,000
Level 1 \| Cash equivalents \| Money market funds
Assets
Cash equivalents	875	111,286
Level 1 \| Short-term Investments \| U.S. government and agency debt
Assets
Investments	269,985	179,156
Level 2
Assets
Total assets	1,398,215	1,376,315
Level 2 \| Other non-current assets \| Severance Pay Fund
Assets
Other non-current asset	1,842	1,758
Level 2 \| Foreign currency forward contracts
Liabilities
Accrued liabilities	193	1,379
Level 2 \| Foreign currency forward contracts \| Prepaid expenses and other current assets
Assets
Prepaid expenses and other current assets	702	124
Level 2 \| Cash equivalents \| Time deposits
Assets
Cash equivalents	183,468	213,012
Level 2 \| Cash equivalents \| Corporate debt securities
Assets
Cash equivalents	20,004	21,999
Level 2 \| Short-term Investments \| Corporate debt securities
Assets
Investments	1,038,232	986,317
Level 2 \| Short-term Investments \| Asset-backed Securities
Assets
Investments	100,488	91,531
Level 2 \| Short-term Investments \| Foreign government and agency debt
Assets
Investments	16,964	28,110
Level 2 \| Short-term Investments \| Municipal debt securities
Assets
Investments	36,515	33,464
Level 3
Assets
Total assets	10,111	10,226
Level 3 \| Long-term investments \| Auction rate securities
Assets
Investments	$ 10,111	$ 10,226

Summary of Change in Fair Values for Level Three Items (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 10,226	$ 16,279
Sales and redemptions		(3,000)
Unrealized losses included in accumulated other comprehensive income	(115)	177
Ending balance	$ 10,111	$ 13,456

Acquired Intangible Assets Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	Jan. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	$ 66,248	$ 66,248
Accumulated Amortization and Write-Offs	(38,603)	(35,550)
Net Carrying Amount	27,645	30,698
Purchased technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts, Finite-Lived	35,498	35,498
Accumulated Amortization and Write-Offs	(17,240)	(15,684)
Net Carrying Amount, Finite-Lived	18,258	19,814
Core technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts, Finite-Lived	850	850
Accumulated Amortization and Write-Offs	(465)	(423)
Net Carrying Amount, Finite-Lived	$ 385	427
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	5 years
Gross Carrying Amounts, Finite-Lived	$ 1,300	1,300
Accumulated Amortization and Write-Offs	(893)	(828)
Net Carrying Amount, Finite-Lived	407	472
Customer intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts, Finite-Lived	28,600	28,600
Accumulated Amortization and Write-Offs	(20,005)	(18,615)
Net Carrying Amount, Finite-Lived	$ 8,595	$ 9,985
Minimum \| Purchased technology
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	4 years
Minimum \| Core technology
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	5 years
Minimum \| Customer intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	5 years
Maximum \| Purchased technology
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	7 years
Maximum \| Core technology
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	8 years
Maximum \| Customer intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	7 years

Future Amortization Expense of Identified Intangibles (Detail) - In Process Research and Development Excluded $ in Thousands	May 02, 2015 USD ($)
Fiscal Year
Remainder of fiscal 2016	$ 9,159
2017	11,027
2018	5,599
2019	1,860
2020	0
Net Carrying Amount, Finite-Lived	$ 27,645

Restructuring - Additional Information (Detail) $ in Millions	3 Months Ended
	May 02, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment charges of equipment held for sale	$ 0.5
Carrying value of equipment held for sale	$ 10.2

Restructuring Charges (Detail) - USD ($) $ in Thousands	3 Months Ended
Restructuring Charges (Detail) - USD ($) $ in Thousands	May 02, 2015	May 03, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 19	$ 5,071
Restructuring charges	592	8,474
Severance and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4,617
Facilities and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	19	444
Other Exit-Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		10
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4,682
Selling and marketing
Restructuring Cost and Reserve [Line Items]
Restructuring charges		48
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	592	358
Write-off of acquired intangible assets
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3,386
Equipment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 573	$ 17

Reconciliation of Beginning and Ending Restructuring Liability Balances by Major Type of Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of balance	$ 4,569
Restructuring charges	19	$ 5,071
Net cash payments	(3,542)
Restructuring liabilities, ending balance	1,046
Facilities and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of balance	1,339
Restructuring charges	19	444
Net cash payments	(312)
Restructuring liabilities, ending balance	1,046
Other Exit-Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of balance	3,230
Restructuring charges		$ 10
Net cash payments	$ (3,230)

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	May 02, 2015	May 03, 2014	Feb. 25, 2015
Income Taxes [Line Items]
Current income tax liability	$ 4.3
Net reduction in unrecognized tax benefits	(3.1)	$ (2.5)
Reduction in unrecognized tax benefits arising from the expiration of statute of limitations	4.0	4.9
Unrecognized tax benefit, interest and penalties accrued	0.9
Additional tax provision	3.1
Current income tax liability		5.7
Tax benefit from an increase in deferred tax asset due to change in negotiated development and expansion incentive		7.8
Increase in current year unrecognized tax benefit estimates		1.1
Increase in tax expense related to fiscal year 2014 tax return of a non-U.S. jurisdiction		1.3
Uncertain tax positions decrease from the lapse of statutes of limitation in various jurisdictions during next 12 months	(11.0)
Tax incentives, tax savings amount	3.3	$ 3.3
Cash, cash equivalents and short-term investments	2,500.0
Undistributed earnings of foreign subsidiaries	500.0
Chief Executive Officer
Income Taxes [Line Items]
Liability to related party	$ 7.0		$ 15.4
Maximum
Income Taxes [Line Items]
Tax incentives, per share effect on earning	$ 0.01	$ 0.01
Foreign Subsidiaries
Income Taxes [Line Items]
Additional tax provision	$ 150.0
Cash, cash equivalents and short-term investments	$ 900.0

Commitments and Contingencies - Additional Information (Detail) - USD ($)			3 Months Ended
	Mar. 31, 2014	Dec. 26, 2012	May 02, 2015	Nov. 14, 2014	May 14, 2014
Commitments and Contingencies Disclosure [Line Items]
Accrued liability related to legal proceedings			$ 0
Carrying value of pledged assets			$ 138,000,000
Carnegie Mellon Litigation
Commitments and Contingencies Disclosure [Line Items]
Date of lawsuit filed			Mar. 06, 2009
Loss contingency, awarded amount	$ 1,540,000,000	$ 1,170,000,000
Pre-judgment interest		$ 322,000,000
Additional royalties			$ 450,000,000
Loss contingency, range of possible loss, minimum			0
Surety Bond
Commitments and Contingencies Disclosure [Line Items]
Bond				$ 216,000,000	$ 1,540,000,000
Commitment Letter
Commitments and Contingencies Disclosure [Line Items]
Bond				$ 95,000,000
Manufacturing Expense
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment, outstanding commitment			$ 212,900,000

Stock Option Plan Activity (Detail) shares in Thousands	3 Months Ended
Stock Option Plan Activity (Detail) shares in Thousands	May 02, 2015 $ / shares shares
Options Outstanding
Beginning Balance \| shares	49,372
Granted \| shares	80
Exercised \| shares	(1,243)
Canceled/Forfeited \| shares	(2,494)
Ending Balance \| shares	45,715
Weighted Average Exercise Price
Beginning Balance \| $ / shares	$ 13.88
Granted \| $ / shares	16.13
Exercised \| $ / shares	10.47
Canceled/Forfeited \| $ / shares	17.80
Ending Balance \| $ / shares	$ 13.75
Time Based Option Award
Options Outstanding
Beginning Balance \| shares	47,140
Granted \| shares	80
Exercised \| shares	(1,243)
Canceled/Forfeited \| shares	(2,486)
Ending Balance \| shares	43,491
Vested or expected to vest at May 2, 2015 \| shares	41,184
Exercisable at May 2, 2015 \| shares	25,511
Weighted Average Exercise Price
Beginning Balance \| $ / shares	$ 13.79
Granted \| $ / shares	16.13
Exercised \| $ / shares	10.47
Canceled/Forfeited \| $ / shares	17.80
Ending Balance \| $ / shares	13.66
Vested or expected to vest at May 2, 2015 \| $ / shares	13.70
Exercisable at May 2, 2015 \| $ / shares	$ 14.39
Market Based Option Award
Options Outstanding
Beginning Balance \| shares	2,232
Canceled/Forfeited \| shares	(8)
Ending Balance \| shares	2,224
Weighted Average Exercise Price
Beginning Balance \| $ / shares	$ 15.43
Canceled/Forfeited \| $ / shares	15.43
Ending Balance \| $ / shares	$ 15.43

Shareholders' Equity - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended
	May 21, 2015	Apr. 01, 2015	May 28, 2015	May 02, 2015	May 03, 2014	May 01, 2015
Stockholders Equity Note [Line Items]
Closing stock price						$ 14.30
Share repurchase program, shares repurchased				1,400,000
Share repurchase program, amount repurchased				$ 22,100,000
Share repurchase program, cumulative shares repurchased				223,300,000
Share repurchase program, total amount of repurchases				$ 2,800,000,000
Share repurchase program, remaining available for future share repurchases				$ 421,400,000
Cash dividend declared per share				$ 0.06	$ 0.06
Employee Stock Purchase Plan, 2000 Restated Plan
Stockholders Equity Note [Line Items]
Unrecognized share based compensation cost				$ 33,700,000
Employee stock purchase plan, shares issued				0	0
Subsequent Event
Stockholders Equity Note [Line Items]
Share repurchase program, shares repurchased			900,000
Share repurchase program, amount repurchased			$ 12,900,000
Share repurchase program, average price per share			$ 13.84
Cash dividend declared per share	$ 0.06
Dividends declared, date to be paid	Jul. 01, 2015
Dividends declared, date of record	Jun. 11, 2015
Time Based Option Award
Stockholders Equity Note [Line Items]
Options vested and expected to vest, aggregate intrinsic value				$ 86,800,000
Options vested and expected to vest, weighted average remaining contractual term (in years)				5 years 10 months 24 days
Options exercisable, aggregate intrinsic value				$ 53,400,000
Options exercisable, weighted average remaining contractual term (in years)				4 years 6 months
Aggregate intrinsic value of stock options exercised				$ 6,300,000	$ 9,400,000
Unrecognized share based compensation cost				$ 46,600,000
Unrecognized share based compensation cost, weighted-average period of recognition				2 years 2 months 12 days
Market Based Option Award
Stockholders Equity Note [Line Items]
Options vested and expected to vest, aggregate intrinsic value				$ 0
Options vested and expected to vest, weighted average remaining contractual term (in years)				6 years
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Unrecognized share based compensation cost				$ 134,000,000
Unrecognized share based compensation cost, weighted-average period of recognition				1 year 8 months 12 days
Vested				4,991,000
Granted				5,818,000
Restricted stock units, aggregate intrinsic value				$ 150,200,000
Restricted stock units vested and expected to vest				10,500,000
Performance Based Restricted Stock Unit
Stockholders Equity Note [Line Items]
Vested		360,723		658,000
Granted				669,000
Performance Based Restricted Stock Unit \| Executive Officer
Stockholders Equity Note [Line Items]
Vested		478,001
Granted		107,954

Activity Related to Non Vested Portion of Restricted Stock Units (Detail) - $ / shares		3 Months Ended
	Apr. 01, 2015	May 02, 2015
Time Based Restricted Units
Restricted Stock Units Outstanding
Beginning Balance		9,748,000
Granted		4,742,000
Vested		(4,333,000)
Canceled/Forfeited		(146,000)
Ending Balance		10,011,000
Weighted Average Grant Date Fair Value
Beginning Balance		$ 14.84
Granted		13.67
Vested		15.39
Canceled/Forfeited		14.09
Ending Balance		$ 14.06
Performance Based Restricted Stock Unit
Restricted Stock Units Outstanding
Beginning Balance		1,254,000
Granted		669,000
Vested	(360,723)	(658,000)
Canceled/Forfeited		(79,000)
Ending Balance		1,186,000
Weighted Average Grant Date Fair Value
Beginning Balance		$ 14.99
Granted		14.28
Vested		15.15
Canceled/Forfeited		14.32
Ending Balance		$ 14.54
Market Based Restricted Stock Unit
Restricted Stock Units Outstanding
Granted		407,000
Ending Balance		407,000
Weighted Average Grant Date Fair Value
Granted		$ 12.24
Ending Balance		$ 12.24
Restricted Stock Units (RSUs)
Restricted Stock Units Outstanding
Beginning Balance		11,002,000
Granted		5,818,000
Vested		(4,991,000)
Canceled/Forfeited		(225,000)
Ending Balance		11,604,000
Weighted Average Grant Date Fair Value
Beginning Balance		$ 14.85
Granted		13.64
Vested		15.36
Canceled/Forfeited		14.17
Ending Balance		$ 14.04

Schedule of Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Cash dividend
Cash dividend per share	$ 0.06	$ 0.06
Total payment to shareholders (in thousands)	$ 30,910	$ 30,172

Total Stock Compensation by Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	May 02, 2015	May 03, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 33,221	$ 29,969
Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,547	2,299
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	24,781	20,368
Selling and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	2,577	2,928
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 4,316	$ 4,374

Share Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	May 02, 2015	Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation capitalized in inventory	$ 1.9	$ 1.5

Weighted Average Assumptions Used to Calculate Fair Value of Time Based Equity Award (Detail) - Time Based Option Award - $ / shares	3 Months Ended
	May 02, 2015	May 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value	$ 4.54	$ 4.64
Expected volatility	34.00%	36.00%
Expected term (in years)	5 years 4 months 24 days	5 years
Risk-free interest rate	1.50%	1.60%
Expected dividend yield	1.60%	1.60%

Valuation Assumptions (Detail) - Total Shareholder Return	3 Months Ended
	May 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	2 years
Expected volatility	27.00%
Average correlation coefficient of peer companies	0.40%
Risk-free interest rate	0.50%
Expected dividend yield	1.70%

Related Party Transactions - Additional Information (Detail) - Chief Executive Officer - USD ($) $ in Millions	3 Months Ended
	May 02, 2015	Feb. 25, 2015
Related Party Transaction [Line Items]
Amount of transactions with related parties	$ 8.4
Liability to related party	$ 7.0	$ 15.4