Marvell Technology 10-Q4 Dec 142015 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
In Millions, unless otherwise specified	Nov. 01, 2014	Nov. 26, 2014
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	1-Nov-14	'
Document Fiscal Year Focus	'2015	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'MRVL	'
Entity Registrant Name	'MARVELL TECHNOLOGY GROUP LTD	'
Entity Central Index Key	'0001058057	'
Current Fiscal Year End Date	'--02-01	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	511.1

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Current assets:	'	'
Cash and cash equivalents	$1,183,993	$965,750
Short-term investments	1,218,785	1,003,655
Accounts receivable, net	445,050	453,496
Inventories	356,417	347,861
Prepaid expenses and other current assets	64,790	56,952
Deferred income taxes	17,327	11,506
Total current assets	3,286,362	2,839,220
Property and equipment, net	343,101	356,165
Long-term investments	10,077	16,279
Goodwill	2,029,945	2,029,945
Acquired intangible assets, net	34,283	49,035
Other non-current assets	145,039	160,366
Total assets	5,848,807	5,451,010
Current liabilities:	'	'
Accounts payable	341,431	316,389
Accrued liabilities	140,084	161,762
Accrued employee compensation	153,059	111,408
Deferred income	70,834	61,747
Total current liabilities	705,408	651,306
Non-current income taxes payable	73,167	81,325
Other non-current liabilities	36,322	42,469
Total liabilities	814,897	775,100
Commitments and contingencies (Note 10)	'	'
Shareholders' equity:	'	'
Common shares, $0.002 par value	1,022	1,005
Additional paid-in capital	3,041,400	2,941,650
Accumulated other comprehensive income (loss)	-2,964	597
Retained earnings	1,994,452	1,732,658
Total shareholders' equity	5,033,910	4,675,910
Total liabilities and shareholders' equity	$5,848,807	$5,451,010

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Nov. 01, 2014	Feb. 01, 2014
Common shares, par value	$0.00	$0.00

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Net revenue	$930,136	$931,226	$2,849,511	$2,472,651
Operating costs and expenses:	'	'	'	'
Cost of goods sold	454,974	464,981	1,426,575	1,186,478
Research and development	288,435	296,291	878,562	867,985
Selling and marketing	34,410	37,496	106,717	116,033
General and administrative	33,473	26,589	95,379	80,104
Amortization and write-off of acquired intangible assets	3,304	10,645	13,297	31,969
Total operating costs and expenses	814,596	836,002	2,520,530	2,282,569
Operating income	115,540	95,224	328,981	190,082
Interest and other income, net	4,764	1,536	18,952	12,949
Income before income taxes	120,304	96,760	347,933	203,031
Provision (benefit) for income taxes	5,000	-6,396	-5,720	-15,160
Net income	$115,304	$103,156	$353,653	$218,191
Net income per share:	'	'	'	'
Basic	$0.22	$0.21	$0.69	$0.44
Diluted	$0.22	$0.21	$0.68	$0.43
Weighted average shares:	'	'	'	'
Basic	513,859	491,979	510,261	496,151
Diluted	519,907	501,189	520,309	502,401
Cash dividend declared per share	$0.06	$0.06	$0.18	$0.18

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Net income	$115,304	$103,156	$353,653	$218,191
Other comprehensive income, net of tax:	'	'	'	'
Net change in unrealized gain/loss on marketable securities	-1,209	1,335	-1,052	-1,199
Net change in unrealized gain/loss on auction rate securities	305	-141	448	-311
Net change in unrealized gain/loss on cash flow hedges	-2,687	435	-2,957	419
Other comprehensive income (loss), net	-3,591	1,629	-3,561	-1,091
Comprehensive income	$111,713	$104,785	$350,092	$217,100

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013
Cash flows from operating activities:	'	'
Net income	$353,653	$218,191
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	79,784	76,576
Share-based compensation	99,283	117,805
Amortization and write-off of acquired intangible assets	14,752	31,969
Other expense (income), net	-12,160	5,994
Excess tax benefits from share-based compensation	-78	-42
Changes in assets and liabilities:	'	'
Accounts receivable	23,275	-136,491
Inventories	-8,793	-129,450
Prepaid expenses and other assets	-8,621	15,012
Accounts payable	16,937	128,311
Accrued liabilities and other non-current liabilities	-22,035	-20,510
Accrued employee compensation	41,651	13,965
Deferred income	9,087	26,220
Net cash provided by operating activities	586,735	347,550
Cash flows from investing activities:	'	'
Purchases of available-for-sale securities	-784,296	-691,749
Sales and maturities of available-for-sale securities	578,095	845,506
Investments in privately-held companies	-701	-1,869
Cash paid for acquisition, net	'	-2,551
Purchases of technology licenses	-14,514	-13,993
Purchases of property and equipment	-48,615	-53,283
Net cash provided by (used in) investing activities	-270,031	82,061
Cash flows from financing activities:	'	'
Repurchase of common stock	-43,774	-376,285
Proceeds from employee stock plans	71,308	97,276
Minimum tax withholding paid on behalf of employees for net share settlement	-25,586	-10,406
Dividend payments to shareholders	-91,859	-89,560
Payments on technology license obligations	-8,628	-6,301
Excess tax benefits from share-based compensation	78	42
Net cash used in financing activities	-98,461	-385,234
Net increase in cash and cash equivalents	218,243	44,377
Cash and cash equivalents at beginning of period	965,750	751,953
Cash and cash equivalents at end of period	$1,183,993	$796,330

The_Company_and_Basis_of_Prese

The Company and Basis of Presentation	9 Months Ended
The Company and Basis of Presentation	Nov. 01, 2014
The Company and Basis of Presentation	'
	Note 1. The Company and Basis of Presentation
	The Company
	Marvell Technology Group Ltd., a Bermuda company (the “Company”), is a leading global semiconductor provider of high-performance application-specific standard products. The Company’s core strength of expertise is the development of complex System-on-a-Chip devices leveraging its extensive technology portfolio of intellectual property in the areas of analog, mixed-signal, digital signal processing, and embedded 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 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 2015 and 2014 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 November 1, 2014, the results of its operations for the three and nine months ended November 1, 2014 and November 2, 2013, its comprehensive income for the three and nine months ended November 1, 2014 and November 2, 2013, and its cash flows for the nine months ended November 1, 2014 and November 2, 2013. The February 1, 2014 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 February 1, 2014, 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 February 1, 2014 as filed on March 27, 2014 with the Securities and Exchange Commission. The results of operations for the three and nine months ended November 1, 2014 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 Black-Scholes valuation model 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_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Nov. 01, 2014
Recent Accounting Pronouncements	'
	Note 2. Recent Accounting Pronouncements
	Accounting Pronouncements Not Yet Effective
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued an amendment to its guidance regarding the reporting requirements of discontinued operations. Under this amended guidance, a discontinued operation is defined as a disposal of a component or group of components that is disposed of or is classified as held for sale and represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. In addition, this amendment requires an entity to present, for each comparative period, the assets and liabilities of a disposal group that includes a discontinued operation separately in the asset and liability sections, respectively, of the statement of financial position and additional disclosures about discontinued operations. This amended guidance is effective for annual and interim reporting periods beginning after December 15, 2014. The Company expects this guidance to have an impact on its financial statements only in the event of a future disposition which meets the criteria.
	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. The core principal of the standard is that an entity should recognize revenue when a customer has 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. It also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, and assets recognized from costs incurred to obtain or fulfill a contract, including significant judgments and changes in judgments. This standard is effective for annual and interim reporting periods beginning after December 15, 2016 and will be effective for the Company’s first quarter of fiscal 2018. Early adoption is not permitted. The standard allows for either full retrospective or modified retrospective adoption. We are evaluating the transition method that will be elected and the potential effects of its adoption on our financial statements.

Investments

Investments	9 Months Ended
Investments	Nov. 01, 2014
Investments	'
	Note 3. Investments
	The following tables summarize the Company’s investments (in thousands):


			November 1, 2014
			Amortized				Gross				Gross				Estimated
			Cost				Unrealized				Unrealized				Fair Value
							Gains				Losses
	Short-term investments:
	Available-for-sale:
	Corporate debt securities		$	842,487			$	2,121			$	(756	)		$	843,852
	U.S. government and agency debt			234,649				136				(32	)			234,753
	Asset backed securities			85,893				40				(67	)			85,866
	Foreign government and agency debt			28,079				25				(20	)			28,084
	Municipal debt securities			23,195				41				(6	)			23,230
	Auction rate securities			3,000				—				—				3,000

	Total short-term investments			1,217,303				2,363				(881	)			1,218,785
	Long-term investments:
	Available-for-sale:
	Auction rate securities			12,500				—				(2,423	)			10,077

	Total long-term investments			12,500				—				(2,423	)			10,077

	Total investments		$	1,229,803			$	2,363			$	(3,304	)		$	1,228,862



			February 1, 2014
			Amortized				Gross				Gross				Estimated
			Cost				Unrealized				Unrealized				Fair Value
							Gains				Losses
	Short-term investments:
	Available-for-sale:
	Corporate debt securities		$	587,095			$	2,789			$	(370	)		$	589,514
	U.S. government and agency debt			301,423				128				(72	)			301,479
	Asset backed securities			76,220				89				(38	)			76,271
	Foreign government and agency debt			20,324				12				(44	)			20,292
	Municipal debt securities			16,059				44				(4	)			16,099

	Total short-term investments			1,001,121				3,062				(528	)			1,003,655
	Long-term investments:
	Available-for-sale:
	Auction rate securities			19,150				—				(2,871	)			16,279

	Total long-term investments			19,150				—				(2,871	)			16,279

	Total investments		$	1,020,271			$	3,062			$	(3,399	)		$	1,019,934

	As of November 1, 2014, 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 November 1, 2014 was $2.4 million less than their par value. Based on the Company’s balance of approximately $2.4 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								Nine Months Ended
			November 1,				November 2,				November 1,				November 2,
			2014				2013				2014				2013
	Gross realized gains		$	415			$	497			$	1,367			$	1,289
	Gross realized losses			(25	)			(216	)			(50	)			(253	)

	Total net realized gains		$	390			$	281			$	1,317			$	1,036

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


		November 1, 2014								February 1, 2014
		Amortized				Estimated				Amortized				Estimated
		Cost				Fair Value				Cost				Fair Value
Due in one year or less		$	356,973			$	357,266			$	309,543			$	309,861
Due between one and five years			848,587				849,763				686,062				688,280
Due over five years			24,243				21,833				24,666				21,793

		$	1,229,803			$	1,228,862			$	1,020,271			$	1,019,934


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):


		November 1, 2014
		Less than 12 months								12 months or more								Total
		Fair				Unrealized				Fair				Unrealized				Fair		Unrealized
		Value				Loss				Value				Loss				Value		Loss
Corporate debt securities		$	318,039			$	(746	)		$	992			$	(10	)		$	319,031	$	(756	)
U.S. government and agency debt			59,046				(32	)			—				—				59,046		(32	)
Asset backed securities			36,510				(67	)			—				—				36,510		(67	)
Foreign government and agency debt			16,572				(20	)			—				—				16,572		(20	)
Municipal debt securities			3,202				(6	)			—				—				3,202		(6	)
Auction rate securities			—				—				10,077				(2,423	)			10,077		(2,423	)

Total securities		$	433,369			$	(871	)		$	11,069			$	(2,433	)		$	444,438	$	(3,304	)



		February 1, 2014
		Less than 12 months								12 months or more								Total
		Fair				Unrealized				Fair				Unrealized				Fair		Unrealized
		Value				Loss				Value				Loss				Value		Loss
Corporate debt securities		$	110,903			$	(366	)		$	2,105			$	(4	)		$	113,008	$	(370	)
U.S. government and agency debt			93,118				(72	)			—				—				93,118		(72	)
Asset backed securities			18,865				(19	)			1,912				(19	)			20,777		(38	)
Foreign government and agency debt			14,299				(44	)			—				—				14,299		(44	)
Municipal debt securities			723				(4	)			—				—				723		(4	)
Auction rate securities			—				—				16,279				(2,871	)			16,279		(2,871	)

Total securities		$	237,908			$	(505	)		$	20,296			$	(2,894	)		$	258,204	$	(3,399	)

Supplemental_Financial_Informa

Supplemental Financial Information	9 Months Ended
Supplemental Financial Information	Nov. 01, 2014
Supplemental Financial Information	'
	Note 4. Supplemental Financial Information (in thousands)


			November 1,				February 1,
			2014				2014
	Inventories:
	Work-in-process		$	197,671			$	195,495
	Finished goods			158,746				152,366

	Total inventories		$	356,417			$	347,861



			November 1,				February 1,
			2014				2014
	Property and equipment, net:
	Machinery and equipment		$	594,702			$	562,038
	Buildings			144,320				144,320
	Computer software			97,452				96,096
	Land			53,373				53,373
	Building improvements			49,786				49,645
	Leasehold improvements			50,187				49,060
	Furniture and fixtures			27,746				27,621
	Construction in progress			5,396				2,911

				1,022,962				985,064
	Less: Accumulated depreciation and amortization			(679,861	)			(628,899	)

	Total property and equipment, net		$	343,101			$	356,165



			November 1,				February 1,
			2014				2014
	Other non-current assets:
	Technology and other licenses		$	68,819			$	83,521
	Deferred tax assets			23,442				19,282
	Investments in privately-held companies			9,267				14,565
	Prepaid land use rights			13,510				13,744
	Deposits			11,918				12,433
	Other			18,083				16,821

	Total other non-current assets		$	145,039			$	160,366



			November 1,				February 1,
			2014				2014
	Accrued liabilities:
	Accrued rebates		$	51,407			$	61,616
	Accrued royalties			25,426				36,568
	Technology license obligations			17,079				18,482
	Accrued legal expense			9,857				14,589
	Other			36,315				30,507

	Total accrued liabilities		$	140,084			$	161,762



			November 1,				February 1,
			2014				2014
	Other non-current liabilities:
	Technology license obligations		$	19,085			$	28,959
Long-term accrued employee compensation			4,622				4,370
Other			12,615				9,140

Other non-current liabilities		$	36,322			$	42,469

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


		Unrealized Gain				Unrealized Gain				Unrealized Gain			Total
		(Loss) on				(Loss) on				(Loss) on Cash
		Marketable				Auction Rate				Flow Hedges
		Securities				Securities
Balance at February 1, 2014		$	2,534			$	(2,871	)		$	934		$	597
Other comprehensive income before reclassifications			67				448				(1,603	)		(1,088	)
Amounts reclassified from accumulated other comprehensive income			(1,119	)			—				(1,354	)		(2,473	)

Other comprehensive income (loss)			(1,052	)			448				(2,957	)		(3,561	)

Balance at November 1, 2014		$	1,482			$	(2,423	)		$	(2,023	)	$	(2,964	)



		Unrealized Gain				Unrealized Gain				Unrealized Gain			Total
		(Loss) on				(Loss) on				(Loss) on Cash
		Marketable				Auction Rate				Flow Hedges
		Securities				Securities
Balance at February 2, 2013		$	2,742			$	(2,681	)		$	1,087		$	1,148
Other comprehensive income before reclassifications			(276	)			(311	)			3,103			2,516
Amounts reclassified from accumulated other comprehensive income			(923	)			—				(2,684	)		(3,607	)

Other comprehensive income (loss)			(1,199	)			(311	)			419			(1,091	)

Balance at November 2, 2013		$	1,543			$	(2,992	)		$	1,506		$	57

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


		Three Months Ended								Nine Months Ended
Affected Line Item in the		November 1,				November 2,				November 1,			November 2,
Statement of Operations		2014				2013				2014			2013
Available-for-sale securities:
Interest and other income, net		$	264			$	380			$	1,119		$	923
Cash flow hedges:
Cost of goods sold			22				41				85			149
Research and development			298				648				1,156			2,319
Selling and marketing			29				53				110			198
General and administrative			1				5				3			18

Total		$	614			$	1,127			$	2,473		$	3,607

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								Nine Months Ended
		November 1,				November 2,				November 1,			November 2,
		2014				2013				2014			2013
Numerator:
Net income		$	115,304			$	103,156			$	353,653		$	218,191

Denominator:
Weighted average shares — basic			513,859				491,979				510,261			496,151
Effect of dilutive securities:
Share-based awards			6,048				9,210				10,048			6,250

Weighted average shares — diluted			519,907				501,189				520,309			502,401

Net income per share:
Basic		$	0.22			$	0.21			$	0.69		$	0.44
Diluted		$	0.22			$	0.21			$	0.68		$	0.43

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


		Three Months Ended								Nine Months Ended
		November 1,				November 2,				November 1,			November 2,
		2014				2013				2014			2013
Weighted average shares outstanding from stock options:
Time-based options			25,092				43,167				22,331			39,854
Market-based options			2,245				2,719				2,306			2,732

			27,337				45,886				24,637			42,586

Weighted average exercise price:
Time-based options		$	17.19			$	14.71			$	17.61		$	15.18

Market-based options		$	15.43			$	15.42			$	15.43		$	15.43

Total		$	17.04			$	14.75			$	17.41		$	15.2

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_Instrumen

Derivative Financial Instruments	9 Months Ended
Derivative Financial Instruments	Nov. 01, 2014
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. Beginning in fiscal 2015, the Company entered into contracts to hedge the Chinese yuan in addition to the Israeli shekel as operating expenses in China continue to grow. The Company’s policy is to enter into foreign currency forward contracts with maturities generally 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):


		November 1,				February 1,
		2014				2014
		Buy Contracts		Sell Contracts		Buy Contracts
	Israeli shekel	$	51,047	$	—	$	39,670
	Chinese yuan		15,614		—		—
	Euro		5,371		5,376		5,718
	Swedish krona		—		—		3,709

		$	72,032	$	5,376	$	49,097

	At February 1, 2014, there were no sell contracts. The fair value of foreign currency exchange contracts was not significant as of any period presented.
	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.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Nov. 01, 2014
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, the severance pay fund and an auction rate security 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 total amount of assets measured using Level 3 valuation methodologies represented 0.2% of total assets as of November 1, 2014.

	The following tables set forth, by level, the Company’s assets that were accounted for at fair value. The tables do not include assets and liabilities that are measured at historical cost or any basis other than fair value (in thousands):


			Level 1			Level 2			Level 3			Portion of Carrying
												Value Measured at
												Fair Value
												at November 1, 2014
	Items measured at fair value on a recurring basis:
	Assets
	Cash equivalents:
	U.S. government and agency debt		$	12,200		$	—		$	—		$	12,200
	Money market funds			16,290			—			—			16,290
	Time deposits			—			206,580			—			206,580
	Municipal debt securities			—			1,908			—			1,908
	Corporate debt securities			—			28,332			—			28,332
	Short-term investments:
	U.S. government and agency debt			234,753			—			—			234,753
	Corporate debt securities			—			843,852			—			843,852
	Asset backed securities			—			85,866			—			85,866
	Foreign government and agency debt			—			28,084			—			28,084
	Municipal debt securities			—			23,230			—			23,230
	Auction rate securities						3,000						3,000
	Prepaid expenses and other current assets:
	Foreign currency forward contracts			—			384			—			384
	Long-term investments:
	Auction rate securities			—			—			10,077			10,077
	Other non-current assets:
	Severance pay fund			—			1,841			—			1,841

	Total assets		$	263,243		$	1,223,077		$	10,077		$	1,496,397

	Liabilities
	Accrued liabilities:
	Foreign currency forward contracts		$	—		$	2,402		$	—		$	2,402



			Level 1			Level 2			Level 3			Portion of Carrying
												Value Measured at
												Fair Value
												at February 1, 2014
	Items measured at fair value on a recurring basis:
	Assets
	Cash equivalents:
	U.S. government and agency debt		$	11,999		$	—		$	—		$	11,999
	Money market funds			2,804			—			—			2,804
	Time deposits			—			247,958			—			247,958
	Municipal debt securities			—			4,800			—			4,800
	Corporate debt securities			—			3,400			—			3,400
	Short-term investments:
	U.S. government and agency debt			301,479			—			—			301,479
	Corporate debt securities			—			589,514			—			589,514
	Asset backed securities			—			76,271			—			76,271
	Foreign government and agency debt			—			20,292			—			20,292
	Municipal debt securities			—			16,099			—			16,099
Prepaid expenses and other current assets:
Foreign currency forward contracts			—			1,012			—			1,012
Long-term investments:
Auction rate securities			—			—			16,279			16,279
Other non-current assets:
Severance pay fund			—			2,193			—			2,193

Total assets		$	316,282		$	961,539		$	16,279		$	1,294,100

Liabilities
Accrued liabilities:
Foreign currency forward contracts		$	—		$	26		$	—		$	26

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


		Nine Months Ended
		November 1,			November 2,
		2014			2013
Beginning balance		$	16,279		$	16,769
Sales and redemptions			(3,650	)		(300	)
Transfer out			(3,000	)		—
Unrealized losses included in accumulated other comprehensive income			448			(311	)

Ending balance		$	10,077		$	16,158

During the three months ended November 1, 2014, the Company received notification by the issuer of a mandatory full call on November 6, 2014 of an auction rate security to be redeemed at par value. As a result, the Company classified the security within Level 2 based on the issuer’s quoted price. Subsequent to the end of the quarter, the auction rate security was fully redeemed.

Acquired_Intangible_Assets_Net

Acquired Intangible Assets, Net	9 Months Ended
Acquired Intangible Assets, Net	Nov. 01, 2014
Acquired Intangible Assets, Net	'
	Note 7. Acquired Intangible Assets, Net
	The carrying amount of acquired intangible assets, net, are as follows (in thousands):


				November 1, 2014							February 1, 2014
		Range of		Gross		Accumulated			Net		Gross		Accumulated			Net
		Useful Lives		Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
				Amounts		and			Amount		Amounts		and			Amount
						Write-Offs							Write-Offs
	Purchased technology	4 - 6 years		$	49,240	$	(27,369	)	$	21,871	$	49,240	$	(20,634	)	$	28,606
	Core technology	5 - 8 years			2,350		(1,850	)		500		2,350		(1,583	)		767
	Trade names	5 years			1,300		(763	)		537		1,300		(568	)		732
	Customer intangibles	5 - 6 years			28,600		(17,225	)		11,375		28,600		(13,056	)		15,544
	IPR&D				—		—			—		3,386		—			3,386

	Total intangible assets, net			$	81,490	$	(47,207	)	$	34,283	$	84,876	$	(35,841	)	$	49,035

	The Company recorded a charge to write-off $3.4 million of IPR&D in the nine months ended November 1, 2014, upon the Company’s decision to discontinue the related project.
	Based on the identified intangible assets recorded at November 1, 2014, the future amortization expense for the next five fiscal years is as follows (in thousands):


	Fiscal Year
	Remainder of fiscal 2015	$	3,585
	2016		12,212
	2017		11,027
	2018		5,599
	2019		1,860
	Thereafter		—

		$	34,283

Restructuring

Restructuring	9 Months Ended
Restructuring	Nov. 01, 2014
Restructuring	'
	Note 8. Restructuring
	In connection with ongoing evaluations of its business, the Company decided to streamline its operations, primarily in Israel to align with its overall strategic plan, and to discontinue the development of a product it originally acquired from a business that it previously purchased.
	The following table presents detail of the related restructuring charges recorded by the Company (in thousands):


		November 1, 2014
		Three Months			Nine Months
		Ended			Ended
	Severance and related costs	$	72		$	5,107
	Facilities and related costs		1,117			1,815
	Other exit-related costs		13			86

			1,202			7,008
	Write-off of assets:
	Equipment		—			17
	Acquired intangible asset		—			3,386

		$	1,202		$	10,411

	Facilities and related costs include a charge for a portion of the lease obligation related to vacating the floors the Company no longer planned to occupy in one of its Israel facilities. The write-off of an acquired intangible asset in the nine months ended November 1, 2014 was due to the Company’s decision to discontinue the related project. Other exit-related costs are primarily associated with ongoing operating expenses related to vacated facilities under restructure actions in previous fiscal years.

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


		Three Months Ended						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Research and development	$	87		$	2,886		$	5,181		$	2,886
	Selling and marketing		—			795			—			795
	General and administrative		1,115			527			1,844			933
	Write-off of acquired intangible assets		—			—			3,386			—

		$	1,202		$	4,208		$	10,411		$	4,614

	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):


		Severance			Facilities			Other			Total
		and Related			and Related			Exit-Related
		Costs			Costs			Costs
	Balance at February 1, 2014	$	51		$	2,383		$	19		$	2,453
	Restructuring charges		5,107			1,815			86			7,008
	Net cash payments		(5,124	)		(1,828	)		(105	)		(7,057	)

	Balance at November 1, 2014	$	34		$	2,370		$	—		$	2,404

	The severance costs included in the table above are expected to be paid by the end of the calendar year. The balance at November 1, 2014 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

Income Tax	9 Months Ended
Income Tax	Nov. 01, 2014
Income Tax	'
	Note 9. Income Tax
	The income tax provision for the three months ended November 1, 2014 included the current income tax liability of $4.5 million and a $0.9 million increase in unrecognized tax benefits from interest on non-U.S. jurisdictions, which was partially offset by a $0.4 million tax benefit due to a return-to-provision adjustment upon the filing of a tax return in a non-U.S. jurisdiction. The income tax benefit for the nine months ended November 1, 2014 included the current income tax liability of $15.1 million, which was offset by tax benefits of $8.9 million from a net reduction in unrecognized tax benefits, $11.5 million from an increase in the net deferred tax assets because of the tax rate change in Singapore and $0.4 million from a return-to-provision adjustment upon the filing of a tax return in a non-U.S. jurisdiction. The net reduction in unrecognized tax benefits arose from the release of $13.2 million due to the expiration of statutes of limitation, which was reduced by a $4.3 million increase in current unrecognized tax benefit estimates in various non-U.S. jurisdictions.
	The income tax benefit for the three months ended November 2, 2013 included the current income tax liability of $4.3 million, which was offset by a net reduction in unrecognized tax benefits of $7.3 million, a $2.5 million tax benefit due to return-to-provision adjustments upon the filing of tax returns and a $0.9 million tax benefit from an increase in the deferred tax asset of a non-U.S. entity due to a change in its statutory tax rate. The net reduction in unrecognized tax benefits primarily arose from the expiration of the statute of limitations. The income tax benefit for the nine months ended November 2, 2013 included the current income tax liability of $11.3 million plus $0.7 million in settlements of audits in non-U.S. jurisdictions, which were offset by a net reduction in unrecognized tax benefits of $23.8 million, a $2.5 million tax benefit due to return-to-provision adjustments upon filing of tax returns in three months ended November 2, 2013 and a $0.9 million tax benefit from an increase in the deferred tax asset of a non-U.S. entity due to a change in its statutory tax rate in the three months ended November 2, 2013. The net reduction in unrecognized tax benefits primarily arose from the expiration of statute of limitations in non-U.S. jurisdictions and from the settlement of two audits in non-U.S. jurisdictions (one for $3.5 million and the other for $4.1 million), less an increase in current unrecognized tax estimates.
	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 $17 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 $1.8 million and $12.3 million for the three and nine months ended November 1, 2014, respectively, and $5.7 million and $14.9 million for the three and nine months ended November 2, 2013, respectively. The benefit of the tax incentives on net income per share was less than $0.01 per share for the three months ended November 1, 2014 and $0.02 per share for the nine months ended November 1, 2014, compared to $0.01 per share for the three months ended November 2, 2013 and $0.03 per share for the nine months ended November 2, 2013.
	Our principal source of liquidity as of November 1, 2014 consisted of approximately $2.4 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 Israel, the United States and Switzerland. We have 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, we would incur a tax expense of approximately $150 million.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Nov. 01, 2014
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 November 1, 2014, these foundries had incurred approximately $213.9 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. 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 November 1, 2014, the Company has a $3.2 million accrued liability related to certain legal proceedings described below in this section. The reduction in the accrued liability from the prior quarter related to litigation matters that were paid or resolved favorably during the quarter. The amount recorded does not relate to the litigation with Carnegie Mellon University (“CMU”). Other than for the matters that the Company has recognized in the consolidated financial statements, it 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 (including the dividend scheduled for December 23, 2013), 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 November 1, 2014 could be as much as $350 million. The Company has secured certain surety bonds for the duration of the appeal to stay execution of judgment pending the appeal. See “—Surety Bond.”
	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. 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 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.
	Lake Cherokee Patent Litigation. On June 30, 2010, Lake Cherokee Hard Drive Technologies, L.L.C. (“Lake Cherokee”) filed a complaint in the U.S. District Court for the Eastern District of Texas. The complaint alleged infringement of U.S. Patent Nos. 5,844,738 and 5,978,162 (collectively, the “Lake Cherokee patents”) which purportedly relate to read-channel integrated circuit devices and to certain HDD products incorporating such devices. Lake Cherokee’s damages claim was approximately $193 million at the start of trial. The case proceeded to trial on August 12, 2013. On August 16, 2013, an Eastern District of Texas jury returned a verdict which unanimously found that MSI did not infringe the Lake Cherokee patents and the Court entered judgment in MSI’s favor. Lake Cherokee then moved for a new trial and the briefing was concluded on October 28, 2013.

	On September 5, 2013, Lake Cherokee filed a second suit in the U.S. District Court for the Eastern District of Texas against Marvell Asia Pte., Ltd. and several of the Company’s storage customers, alleging infringement of the Lake Cherokee patents.
	On September 25, 2013, Lake Cherokee filed a third suit in the U.S. District Court for the Eastern District of Texas against MSI, MAPL and two of the Company’s customers, alleging infringement of U.S. Patent No. 5,583,706, which purportedly relates to certain HDD related technologies.
	All the parties involved in the three cases reached settlement in August 2014 and the three cases were dismissed with prejudice. The settlement did not have a significant impact on the Company’s financial statements.
	Azure Networks Litigation. On March 22, 2011, Azure Networks, LLC 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, and the appeal has been briefed. Oral argument before a Federal Circuit panel was held on April 11, 2014. On November 6, 2014, the Federal Circuit issued an order vacating the judgment of non-infringement and remanding for further proceedings.
	Power Management Systems Litigation. On August 22, 2011, Power Management Systems LLC (“PMS”), a subsidiary of Acacia Research Corp., filed a complaint against the Company’s subsidiary Marvell Semiconductor, Ltd. (“MSL”) and other defendants, in the U.S. District Court for the District of Delaware. The complaint asserts U.S. Patent No. 5,504,909, which relates to a power management apparatus, against various products. The complaint seeks unspecified damages. On October 17, 2011, PMS amended its complaint by substituting MSL with MSI. MSI filed its answer and counterclaims on November 4, 2011. A claim construction hearing was held on January 18, 2013, and a ruling was issued on May 30, 2013. On June 14, 2013, the District Court entered a judgment of non-infringement. On June 17, 2013, PMS appealed, and the appeal has been briefed. The Federal Circuit Court of Appeals heard oral argument on January 10, 2014, and affirmed the district court’s rulings on January 14, 2014. The deadline for PMS to appeal to the United States Supreme Court passed in mid-April 2014 without PMS taking any further action.
	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 is scheduled to take place on January 14, 2015.
	Freescale Litigation. On July 6, 2012, Freescale Semiconductor, Inc. (“Freescale”) filed a complaint against MSI in the U.S. District Court for the Western District of Texas, and amended the complaint on February 4, 2013. On January 4, 2013, three of the Company’s subsidiaries, MSI, Marvell International Ltd. and Marvell World Trade Ltd., filed a complaint against Freescale in the U.S. District Court for the Western District of Texas, and amended the compliant on January 14, 2013. On April 11, 2014, the Court dismissed both of the above two cases with prejudice pursuant to a settlement and patent license agreement. The settlement did not have a significant impact on the Company’s financial statements.
	Progressive Semiconductor Solutions Patent Litigation. On September 30, 2013, Progressive Semiconductor Solutions LLC (“PSS”) filed a complaint in the Central District of California against MSI and another defendant, alleging infringement of U.S. Patent Nos. 6,473,349 (the “349 patent”) and 6,862,208 (the “208 patent”). The patents purportedly relate to certain memory devices. On March 3, 2014, the District Court dismissed MSI without prejudice. On March 4, 2014, PSS filed a new complaint against MSI, alleging infringement of the ‘349 patent but not the ‘208 patent. The parties reached settlement in August 2014 and the case was dismissed with prejudice on August 21, 2014. The settlement did not have a significant impact on the Company’s financial statements.
	Vantage Point Technology Patent Litigation. On November 21, 2013, Vantage Point Technology, Inc. (“VPT”) filed suit against a third party defendant 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. A claim construction hearing is currently scheduled for January 27, 2015. The first trial in the series of VPT cases against various defendants is currently scheduled for July 13, 2015.

	Voss Litigation and Consolidated Cases. On April 7, 2014, Lee Voss (“Voss”) filed an action asserting putative class action claims on behalf of the Company’s shareholders and derivative claims ostensibly on behalf of the Company in the United States District Court for the Northern District of California, San Jose Division. The complaint alleges that certain officers and directors of the Company breached their fiduciary duties by causing or allowing the Company to engage in the purported willful infringement of certain patents asserted against it in litigation by CMU and by failing to institute adequate internal controls, resulting in an adverse verdict. Additionally, the complaint alleges unjust enrichment and a breach of the duty of honest services by three of the officers. The Company is named as a nominal defendant. Voss requests damages and restitution in unspecified amounts, equitable and/or injunctive relief, and the costs and fees of bringing the action. On June 2, 2014, Sebastiano D’Arrigo filed a second, nearly identical complaint in the same court, which was consolidated with the Voss action. On June 13, 2014, James and Marie DiBiase filed a third, nearly identical complaint in the Superior Court for the County of Santa Clara Superior Court, which was removed to the United States District Court for the Northern District of California, San Jose Division and consolidated with the Voss action. The plaintiffs filed an amended consolidated complaint on August 15, 2014. The Company and the defendant officers and directors filed a motion to dismiss the amended consolidated complaint on September 4, 2014, which the plaintiffs opposed on October 30, 2014. The defendants’ filed their reply brief on November 25, 2014. The Court has scheduled a hearing on the defendants’ motion to dismiss for January 22, 2015. The action is in the preliminary stages and the Court has permitted only limited discovery.
	Bandspeed Litigation. On May 9, 2014, Bandspeed, Inc. filed suit against MSI, alleging infringement of U.S. Patent Nos. 7,027,418; 7,570,614; 7,477,624; 7,903,608; 8,542,643, purportedly related to certain Bluetooth technology. The complaint seeks unspecified damages. A claim construction hearing is currently scheduled for July 24, 2015.
	SOTA Litigation. On October 24, 2014, SOTA Semiconductor LLC filed suit against MSI, alleging infringement of U.S. Patent Nos. 5,991,545 and 6,643,713, purportedly related to certain processor technology. The complaint seeks unspecified damages.
	Surety Bond
	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 us 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 November 1, 2014 could be as much as $350 million. On November 14, 2014, we 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 our campus located in Santa Clara, California, which has a carrying value of $147 million at November 1, 2014. We 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

Shareholders' Equity	9 Months Ended
Shareholders' Equity	Nov. 01, 2014
Shareholders' Equity	'
	Note 11. Shareholders’ Equity
	Stock Plans
	Activity under the Company’s stock option plans is included in the following table (in thousands, except per share amounts):


			Time-Based Options					Market-Based Options						Total
			Number of			Weighted		Number of			Weighted			Number of			Weighted
			Shares			Average		Shares			Average			Shares			Average
						Exercise Price					Exercise Price						Exercise Price
	Balance at February 1, 2014			49,156		$	13.4		2,623		$	15.43			51,779		$	13.51
	Granted			6,177		$	15.35		—		$	—			6,177		$	15.35
	Exercised			(3,052	)	$	10.44		—		$	—			(3,052	)	$	10.44
	Canceled/Forfeited			(3,896	)	$	14.73		(388	)	$	15.43			(4,284	)	$	14.79

	Balance at November 1, 2014			48,385		$	13.73		2,235		$	15.43			50,620		$	13.81

	Vested or expected to vest at November 1, 2014			45,280		$	13.79

	Exercisable at November 1, 2014			23,453		$	15.15

	For time-based stock options vested and expected to vest at November 1, 2014, the aggregate intrinsic value was $72.9 million and the weighted average remaining contractual term was 6.0 years. For time-based stock options exercisable at November 1, 2014, the aggregate intrinsic value was $36.3 million and the weighted average remaining contractual term was 3.7 years. The aggregate intrinsic value of stock options exercised during the three months ended November 1, 2014 and November 2, 2013 was $1.5 million and $5.6 million, respectively. The aggregate intrinsic value of stock options exercised during the nine months ended November 1, 2014 and November 2, 2013 was $15.1 million and $21.7 million, respectively. There was no aggregate intrinsic value for market-based stock options at November 1, 2014 and the weighted average remaining contractual term of market-based stock options expected to reach the end of the vesting period at November 1, 2014 was 6.5 years. The Company’s closing stock price of $13.44 as reported on the NASDAQ Global Select Market for all in-the-money options as of October 31, 2014 was used to calculate the aggregate intrinsic value.
	As of November 1, 2014, the unamortized compensation expense for time-based stock options was $60.3 million and market-based stock options were fully amortized in fiscal 2014. 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 2.5 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						Total
			Number of			Weighted		Number of			Weighted			Number of			Weighted
			Shares			Average		Shares			Average			Shares			Average
						Grant Date					Grant Date						Grant Date
						Fair Value					Fair Value						Fair Value
	Balance at February 1, 2014			11,254		$	14.11		100		$	10.52			11,354		$	14.08
	Granted			5,435		$	15.23		1,277	*	$	14.98	*		6,712		$	15.18
	Vested			(5,652	)	$	13.95		(3	)	$	10.52			(5,655	)	$	13.95
	Canceled/Forfeited			(908	)	$	14.25		(110	)	$	10.96			(1,018	)	$	13.89

	Balance at November 1, 2014			10,129		$	14.82		1,264		$	14.99			11,393		$	14.84


	*	Amounts represent the target number of restricted stock units at grant date. For awards granted to our executive officers, up to 200% of the target restricted stock units may vest if the maximum level for financial and strategic goals is achieved.
	The Company grants performance-based restricted stock units (“PSUs”) to certain members of senior management. Pursuant to the PSUs, each eligible employee is entitled to vest in a certain number of shares based on such employee’s achievement of individual financial and strategic performance goals for fiscal 2015, including, for example, net revenue and operating expense targets, and other individual strategic milestones. The actual number of shares that will vest for each eligible employee based on the achievement of such performance goals will be determined at the end of fiscal 2015 and will vest over two years, with 50% vesting on April 1, 2015 and 50% on April 1, 2016. The Company recognizes expenses associated with the PSUs when it becomes probable that the performance conditions will be met. Once it becomes probable that a PSU will vest, the Company recognizes compensation expense equal to the number of shares multiplied by the fair value of the related shares measured at the grant date.
	The aggregate intrinsic value of restricted stock units expected to vest as of November 1, 2014 was $140.6 million. The number of restricted stock units that are expected to vest is 10.5 million shares.

	As of November 1, 2014, unamortized compensation expense related to restricted stock units was $99.1 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 1.6 years.
	Executive Performance Awards
	In April 2014, the Company granted performance-based equity awards to each of our executive officers which are based on their achievement of certain performance goals in fiscal 2015 and 2016. These equity awards include restricted stock units which vest based on financial performance criteria (“Financial Performance RSU”) and restricted stock units which vest based on both financial performance criteria and individual strategic goals (“Strategic Performance Award”). 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. Each Financial Performance RSU will vest 50% on the first anniversary of the commencement date based on achievement of fiscal 2015 financial performance criteria and 50% on the second anniversary of the vesting commencement date based on the achievement of fiscal 2016 financial performance criteria. The Strategic Performance Awards will vest based on achievement at the threshold level of either the revenue or modified non-GAAP operating income objective established for the Financial Performance RSU, in addition to the achievement of additional individual strategic goals. Each Strategic Performance Award will vest 50% on the first anniversary of the commencement date based on achievement of fiscal 2015 individual strategic goals and 50% on second anniversary date based on the achievement of the fiscal 2016 individual strategic goals.
	Employee Stock Purchase Plan
	During the three months ended November 1, 2014 and November 2, 2013, the Company issued no shares under the 2000 Employee Stock Purchase Plan, as amended and restated (the “ESPP”). A total of 5.2 million shares were issued at a weighted average price of $7.58 per share in the nine months ended November 1, 2014 and a total of 5.0 million shares were issued at a weighted average price of $7.34 per share in the nine months ended November 2, 2013 under the ESPP. As of November 1, 2014, there was $6.1 million of unrecognized compensation cost related to the ESPP.
	Share Repurchase Program
	The Company repurchased 3.7 million of its common shares for $45.0 million during the three and nine months ended November 1, 2014. During the three and nine months ended November 2, 2013, the Company repurchased 6.1 million of its common shares for $71.3 million in cash and 33.2 million of its common shares for $354.1 million, respectively. 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 November 1, 2014, a total of 220.5 million cumulative shares have been repurchased under the Company’s share repurchase program for a total $2.8 billion in cash and there was $213.4 million remaining available for future share repurchases.
	Dividends
	The Company paid the following cash dividends:


			Three Months Ended					Nine Months Ended
			November 1,			November 2,		November 1,			November 2,
			2014			2013		2014			2013
	Cash dividend per share		$	0.06		$	0.06	$	0.18		$	0.18

	Total payment to shareholders (in thousands)		$	30,867		$	29,516	$	91,859		$	89,560

	On November 20, 2014, the Company announced that its board of directors declared a cash dividend of $0.06 per share to be paid on December 29, 2014 to shareholders of record as of December 11, 2014.
	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.

ShareBased_Compensation

Share-Based Compensation	9 Months Ended
Share-Based Compensation	Nov. 01, 2014
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						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Cost of goods sold	$	1,934		$	2,531		$	5,966		$	6,266
	Research and development		24,198			30,084			68,842			82,345
	Selling and marketing		2,855			3,738			8,400			10,778
	General and administrative		5,307			6,848			16,075			18,416

		$	34,294		$	43,201		$	99,283		$	117,805

	Share-based compensation capitalized in inventory was $1.5 million at November 1, 2014 and $1.7 million at February 1, 2014.
	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:


		Three Months Ended						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Time-based Stock Options:
	Weighted average fair value	$	3.43		$	3.91		$	4.35		$	3.42
	Expected volatility		34	%		42	%		35	%		45	%
	Expected term (in years)		5			5			5			5
	Risk-free interest rate		1.7	%		1.5	%		1.6	%		0.8	%
	Expected dividend yield		1.8	%		2	%		1.6	%		2.4	%


		Nine Months Ended
		November 1,			November 2,
		2014			2013
	Employee Stock Purchase Plan:
	Estimated fair value	$	4.13		$	3.45
	Volatility		32	%		40	%
	Expected term (in years)		1.3			1.3
	Risk-free interest rate		0.2	%		0.2	%
	Dividend yield		1.6	%		2.2	%

The_Company_and_Basis_of_Prese1

The Company and Basis of Presentation (Policies)	9 Months Ended
The Company and Basis of Presentation (Policies)	Nov. 01, 2014
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 2015 and 2014 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 November 1, 2014, the results of its operations for the three and nine months ended November 1, 2014 and November 2, 2013, its comprehensive income for the three and nine months ended November 1, 2014 and November 2, 2013, and its cash flows for the nine months ended November 1, 2014 and November 2, 2013. The February 1, 2014 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 February 1, 2014, 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 February 1, 2014 as filed on March 27, 2014 with the Securities and Exchange Commission. The results of operations for the three and nine months ended November 1, 2014 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 Black-Scholes valuation model 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 Not Yet Effective	'
	Accounting Pronouncements Not Yet Effective
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued an amendment to its guidance regarding the reporting requirements of discontinued operations. Under this amended guidance, a discontinued operation is defined as a disposal of a component or group of components that is disposed of or is classified as held for sale and represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. In addition, this amendment requires an entity to present, for each comparative period, the assets and liabilities of a disposal group that includes a discontinued operation separately in the asset and liability sections, respectively, of the statement of financial position and additional disclosures about discontinued operations. This amended guidance is effective for annual and interim reporting periods beginning after December 15, 2014. The Company expects this guidance to have an impact on its financial statements only in the event of a future disposition which meets the criteria.
	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. The core principal of the standard is that an entity should recognize revenue when a customer has 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. It also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, and assets recognized from costs incurred to obtain or fulfill a contract, including significant judgments and changes in judgments. This standard is effective for annual and interim reporting periods beginning after December 15, 2016 and will be effective for the Company’s first quarter of fiscal 2018. Early adoption is not permitted. The standard allows for either full retrospective or modified retrospective adoption. We are evaluating the transition method that will be elected and the potential effects of its adoption on our financial statements.

Investments_Tables

Investments (Tables)	9 Months Ended
Investments (Tables)	Nov. 01, 2014
Schedule of Available-for-sale Securities Reconciliation	'
	The following tables summarize the Company’s investments (in thousands):


		November 1, 2014
		Amortized			Gross			Gross			Estimated
		Cost			Unrealized			Unrealized			Fair Value
					Gains			Losses
	Short-term investments:
	Available-for-sale:
	Corporate debt securities	$	842,487		$	2,121		$	(756	)	$	843,852
	U.S. government and agency debt		234,649			136			(32	)		234,753
	Asset backed securities		85,893			40			(67	)		85,866
	Foreign government and agency debt		28,079			25			(20	)		28,084
	Municipal debt securities		23,195			41			(6	)		23,230
	Auction rate securities		3,000			—			—			3,000

	Total short-term investments		1,217,303			2,363			(881	)		1,218,785
	Long-term investments:
	Available-for-sale:
	Auction rate securities		12,500			—			(2,423	)		10,077

	Total long-term investments		12,500			—			(2,423	)		10,077

	Total investments	$	1,229,803		$	2,363		$	(3,304	)	$	1,228,862



		February 1, 2014
		Amortized			Gross			Gross			Estimated
		Cost			Unrealized			Unrealized			Fair Value
					Gains			Losses
	Short-term investments:
	Available-for-sale:
	Corporate debt securities	$	587,095		$	2,789		$	(370	)	$	589,514
	U.S. government and agency debt		301,423			128			(72	)		301,479
	Asset backed securities		76,220			89			(38	)		76,271
	Foreign government and agency debt		20,324			12			(44	)		20,292
	Municipal debt securities		16,059			44			(4	)		16,099

	Total short-term investments		1,001,121			3,062			(528	)		1,003,655
	Long-term investments:
	Available-for-sale:
	Auction rate securities		19,150			—			(2,871	)		16,279

	Total long-term investments		19,150			—			(2,871	)		16,279

	Total investments	$	1,020,271		$	3,062		$	(3,399	)	$	1,019,934

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						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Gross realized gains	$	415		$	497		$	1,367		$	1,289
	Gross realized losses		(25	)		(216	)		(50	)		(253	)

	Total net realized gains	$	390		$	281		$	1,317		$	1,036

Investments Classified by Contractual Maturity Date	'
	The contractual maturities of available-for-sale securities are presented in the following table (in thousands):


		November 1, 2014						February 1, 2014
		Amortized			Estimated			Amortized			Estimated
		Cost			Fair Value			Cost			Fair Value
	Due in one year or less	$	356,973		$	357,266		$	309,543		$	309,861
	Due between one and five years		848,587			849,763			686,062			688,280
	Due over five years		24,243			21,833			24,666			21,793

		$	1,229,803		$	1,228,862		$	1,020,271		$	1,019,934

Unrealized Loss Position Investments	'
	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):


		November 1, 2014
		Less than 12 months						12 months or more						Total
		Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
		Value			Loss			Value			Loss			Value		Loss
	Corporate debt securities	$	318,039		$	(746	)	$	992		$	(10	)	$	319,031	$	(756	)
	U.S. government and agency debt		59,046			(32	)		—			—			59,046		(32	)
	Asset backed securities		36,510			(67	)		—			—			36,510		(67	)
	Foreign government and agency debt		16,572			(20	)		—			—			16,572		(20	)
	Municipal debt securities		3,202			(6	)		—			—			3,202		(6	)
	Auction rate securities		—			—			10,077			(2,423	)		10,077		(2,423	)

	Total securities	$	433,369		$	(871	)	$	11,069		$	(2,433	)	$	444,438	$	(3,304	)



		February 1, 2014
		Less than 12 months						12 months or more						Total
		Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
		Value			Loss			Value			Loss			Value		Loss
	Corporate debt securities	$	110,903		$	(366	)	$	2,105		$	(4	)	$	113,008	$	(370	)
	U.S. government and agency debt		93,118			(72	)		—			—			93,118		(72	)
	Asset backed securities		18,865			(19	)		1,912			(19	)		20,777		(38	)
	Foreign government and agency debt		14,299			(44	)		—			—			14,299		(44	)
	Municipal debt securities		723			(4	)		—			—			723		(4	)
	Auction rate securities		—			—			16,279			(2,871	)		16,279		(2,871	)

	Total securities	$	237,908		$	(505	)	$	20,296		$	(2,894	)	$	258,204	$	(3,399	)

Supplemental_Financial_Informa1

Supplemental Financial Information (Tables)	9 Months Ended
Supplemental Financial Information (Tables)	Nov. 01, 2014
Schedule of Inventory, Current	'

		November 1,			February 1,
		2014			2014
	Inventories:
	Work-in-process	$	197,671		$	195,495
	Finished goods		158,746			152,366

	Total inventories	$	356,417		$	347,861

Property, Plant and Equipment	'

		November 1,			February 1,
		2014			2014
	Property and equipment, net:
	Machinery and equipment	$	594,702		$	562,038
	Buildings		144,320			144,320
	Computer software		97,452			96,096
	Land		53,373			53,373
	Building improvements		49,786			49,645
	Leasehold improvements		50,187			49,060
	Furniture and fixtures		27,746			27,621
	Construction in progress		5,396			2,911

			1,022,962			985,064
	Less: Accumulated depreciation and amortization		(679,861	)		(628,899	)

	Total property and equipment, net	$	343,101		$	356,165

Schedule of Other Assets, Noncurrent	'

		November 1,			February 1,
		2014			2014
	Other non-current assets:
	Technology and other licenses	$	68,819		$	83,521
	Deferred tax assets		23,442			19,282
	Investments in privately-held companies		9,267			14,565
	Prepaid land use rights		13,510			13,744
	Deposits		11,918			12,433
	Other		18,083			16,821

	Total other non-current assets	$	145,039		$	160,366

Schedule of Accrued Liabilities	'

		November 1,			February 1,
		2014			2014
	Accrued liabilities:
	Accrued rebates	$	51,407		$	61,616
	Accrued royalties		25,426			36,568
	Technology license obligations		17,079			18,482
	Accrued legal expense		9,857			14,589
	Other		36,315			30,507

	Total accrued liabilities	$	140,084		$	161,762

Other Noncurrent Liabilities	'

		November 1,			February 1,
		2014			2014
	Other non-current liabilities:
	Technology license obligations	$	19,085		$	28,959
	Long-term accrued employee compensation		4,622			4,370
	Other		12,615			9,140

	Other non-current liabilities	$	36,322		$	42,469

Changes in Accumulated Other Comprehensive Income (loss) by Component	'
	The changes in accumulated other comprehensive income (loss) by component are presented in the following tables (in thousands):


		Unrealized Gain			Unrealized Gain			Unrealized Gain			Total
		(Loss) on			(Loss) on			(Loss) on Cash
		Marketable			Auction Rate			Flow Hedges
		Securities			Securities
	Balance at February 1, 2014	$	2,534		$	(2,871	)	$	934		$	597
	Other comprehensive income before reclassifications		67			448			(1,603	)		(1,088	)
	Amounts reclassified from accumulated other comprehensive income		(1,119	)		—			(1,354	)		(2,473	)

	Other comprehensive income (loss)		(1,052	)		448			(2,957	)		(3,561	)

	Balance at November 1, 2014	$	1,482		$	(2,423	)	$	(2,023	)	$	(2,964	)



		Unrealized Gain			Unrealized Gain			Unrealized Gain			Total
		(Loss) on			(Loss) on			(Loss) on Cash
		Marketable			Auction Rate			Flow Hedges
		Securities			Securities
	Balance at February 2, 2013	$	2,742		$	(2,681	)	$	1,087		$	1,148
	Other comprehensive income before reclassifications		(276	)		(311	)		3,103			2,516
	Amounts reclassified from accumulated other comprehensive income		(923	)		—			(2,684	)		(3,607	)

	Other comprehensive income (loss)		(1,199	)		(311	)		419			(1,091	)

	Balance at November 2, 2013	$	1,543		$	(2,992	)	$	1,506		$	57

Amounts Reclassified from Accumulated Other Comprehensive Income by Components	'
	The amounts reclassified from accumulated other comprehensive income by components are presented in the following table (in thousands):


		Three Months Ended						Nine Months Ended
	Affected Line Item in the	November 1,			November 2,			November 1,			November 2,
	Statement of Operations	2014			2013			2014			2013
	Available-for-sale securities:
	Interest and other income, net	$	264		$	380		$	1,119		$	923
	Cash flow hedges:
	Cost of goods sold		22			41			85			149
	Research and development		298			648			1,156			2,319
	Selling and marketing		29			53			110			198
	General and administrative		1			5			3			18

	Total	$	614		$	1,127		$	2,473		$	3,607

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						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Numerator:
	Net income	$	115,304		$	103,156		$	353,653		$	218,191

	Denominator:
	Weighted average shares — basic		513,859			491,979			510,261			496,151
	Effect of dilutive securities:
	Share-based awards		6,048			9,210			10,048			6,250

	Weighted average shares — diluted		519,907			501,189			520,309			502,401

	Net income per share:
	Basic	$	0.22		$	0.21		$	0.69		$	0.44
	Diluted	$	0.22		$	0.21		$	0.68		$	0.43

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


		Three Months Ended						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Weighted average shares outstanding from stock options:
	Time-based options		25,092			43,167			22,331			39,854
	Market-based options		2,245			2,719			2,306			2,732

			27,337			45,886			24,637			42,586

	Weighted average exercise price:
	Time-based options	$	17.19		$	14.71		$	17.61		$	15.18

	Market-based options	$	15.43		$	15.42		$	15.43		$	15.43

	Total	$	17.04		$	14.75		$	17.41		$	15.2

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	9 Months Ended
Derivative Financial Instruments (Tables)	Nov. 01, 2014
Schedule of Derivative Instruments	'
	The notional amounts of outstanding forward contracts were as follows (in thousands):


		November 1,				February 1,
		2014				2014
		Buy Contracts		Sell Contracts		Buy Contracts
	Israeli shekel	$	51,047	$	—	$	39,670
	Chinese yuan		15,614		—		—
	Euro		5,371		5,376		5,718
	Swedish krona		—		—		3,709

		$	72,032	$	5,376	$	49,097

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Nov. 01, 2014
Fair Value, Assets Measured on Recurring Basis	'
	The following tables set forth, by level, the Company’s assets that were accounted for at fair value. The tables do not include assets and liabilities that are measured at historical cost or any basis other than fair value (in thousands):


			Level 1				Level 2				Level 3			Portion of Carrying
														Value Measured at
														Fair Value
														at November 1, 2014
	Items measured at fair value on a recurring basis:
	Assets
	Cash equivalents:
	U.S. government and agency debt		$	12,200			$	—			$	—		$	12,200
	Money market funds			16,290				—				—			16,290
	Time deposits			—				206,580				—			206,580
	Municipal debt securities			—				1,908				—			1,908
	Corporate debt securities			—				28,332				—			28,332
	Short-term investments:
	U.S. government and agency debt			234,753				—				—			234,753
	Corporate debt securities			—				843,852				—			843,852
	Asset backed securities			—				85,866				—			85,866
	Foreign government and agency debt			—				28,084				—			28,084
	Municipal debt securities			—				23,230				—			23,230
	Auction rate securities							3,000							3,000
	Prepaid expenses and other current assets:
	Foreign currency forward contracts			—				384				—			384
	Long-term investments:
	Auction rate securities			—				—				10,077			10,077
	Other non-current assets:
	Severance pay fund			—				1,841				—			1,841

	Total assets		$	263,243			$	1,223,077			$	10,077		$	1,496,397

	Liabilities
	Accrued liabilities:
	Foreign currency forward contracts		$	—			$	2,402			$	—		$	2,402



			Level 1				Level 2				Level 3			Portion of Carrying
														Value Measured at
														Fair Value
														at February 1, 2014
	Items measured at fair value on a recurring basis:
	Assets
	Cash equivalents:
	U.S. government and agency debt		$	11,999			$	—			$	—		$	11,999
	Money market funds			2,804				—				—			2,804
	Time deposits			—				247,958				—			247,958
	Municipal debt securities			—				4,800				—			4,800
	Corporate debt securities			—				3,400				—			3,400
	Short-term investments:
	U.S. government and agency debt			301,479				—				—			301,479
	Corporate debt securities			—				589,514				—			589,514
	Asset backed securities			—				76,271				—			76,271
	Foreign government and agency debt			—				20,292				—			20,292
	Municipal debt securities			—				16,099				—			16,099
	Prepaid expenses and other current assets:
	Foreign currency forward contracts			—				1,012				—			1,012
	Long-term investments:
	Auction rate securities			—				—				16,279			16,279
	Other non-current assets:
	Severance pay fund			—				2,193				—			2,193

	Total assets		$	316,282			$	961,539			$	16,279		$	1,294,100

Liabilities
Accrued liabilities:
Foreign currency forward contracts		$	—			$	26			$	—		$	26

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):


			Nine Months Ended
			November 1,				November 2,
			2014				2013
	Beginning balance		$	16,279			$	16,769
	Sales and redemptions			(3,650	)			(300	)
	Transfer out			(3,000	)			—
	Unrealized losses included in accumulated other comprehensive income			448				(311	)

	Ending balance		$	10,077			$	16,158

Acquired_Intangible_Assets_Net1

Acquired Intangible Assets, Net (Tables)	9 Months Ended
Acquired Intangible Assets, Net (Tables)	Nov. 01, 2014
Schedule of Finite-Lived Intangible Assets by Major Class	'
	The carrying amount of acquired intangible assets, net, are as follows (in thousands):


				November 1, 2014							February 1, 2014
		Range of		Gross		Accumulated			Net		Gross		Accumulated			Net
		Useful Lives		Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
				Amounts		and			Amount		Amounts		and			Amount
						Write-Offs							Write-Offs
	Purchased technology	4 - 6 years		$	49,240	$	(27,369	)	$	21,871	$	49,240	$	(20,634	)	$	28,606
	Core technology	5 - 8 years			2,350		(1,850	)		500		2,350		(1,583	)		767
	Trade names	5 years			1,300		(763	)		537		1,300		(568	)		732
	Customer intangibles	5 - 6 years			28,600		(17,225	)		11,375		28,600		(13,056	)		15,544
	IPR&D				—		—			—		3,386		—			3,386

	Total intangible assets, net			$	81,490	$	(47,207	)	$	34,283	$	84,876	$	(35,841	)	$	49,035

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	'
	Based on the identified intangible assets recorded at November 1, 2014, the future amortization expense for the next five fiscal years is as follows (in thousands):


	Fiscal Year
	Remainder of fiscal 2015	$	3,585
	2016		12,212
	2017		11,027
	2018		5,599
	2019		1,860
	Thereafter		—

		$	34,283

Restructuring_Tables

Restructuring (Tables)	9 Months Ended
Restructuring (Tables)	Nov. 01, 2014
Schedule of Restructuring Reserve by Type of Cost	'
	The following table presents detail of the related restructuring charges recorded by the Company (in thousands):


		November 1, 2014
		Three Months			Nine Months
		Ended			Ended
	Severance and related costs	$	72		$	5,107
	Facilities and related costs		1,117			1,815
	Other exit-related costs		13			86

			1,202			7,008
	Write-off of assets:
	Equipment		—			17
	Acquired intangible asset		—			3,386

		$	1,202		$	10,411

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


		Three Months Ended						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Research and development	$	87		$	2,886		$	5,181		$	2,886
	Selling and marketing		—			795			—			795
	General and administrative		1,115			527			1,844			933
	Write-off of acquired intangible assets		—			—			3,386			—

		$	1,202		$	4,208		$	10,411		$	4,614

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):


		Severance			Facilities			Other			Total
		and Related			and Related			Exit-Related
		Costs			Costs			Costs
	Balance at February 1, 2014	$	51		$	2,383		$	19		$	2,453
	Restructuring charges		5,107			1,815			86			7,008
	Net cash payments		(5,124	)		(1,828	)		(105	)		(7,057	)

	Balance at November 1, 2014	$	34		$	2,370		$	—		$	2,404

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	9 Months Ended
Shareholders' Equity (Tables)	Nov. 01, 2014
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	'
	Activity under the Company’s stock option plans is included in the following table (in thousands, except per share amounts):


			Time-Based Options					Market-Based Options						Total
			Number of			Weighted		Number of			Weighted			Number of			Weighted
			Shares			Average		Shares			Average			Shares			Average
						Exercise Price					Exercise Price						Exercise Price
	Balance at February 1, 2014			49,156		$	13.4		2,623		$	15.43			51,779		$	13.51
	Granted			6,177		$	15.35		—		$	—			6,177		$	15.35
	Exercised			(3,052	)	$	10.44		—		$	—			(3,052	)	$	10.44
	Canceled/Forfeited			(3,896	)	$	14.73		(388	)	$	15.43			(4,284	)	$	14.79

	Balance at November 1, 2014			48,385		$	13.73		2,235		$	15.43			50,620		$	13.81

	Vested or expected to vest at November 1, 2014			45,280		$	13.79

	Exercisable at November 1, 2014			23,453		$	15.15

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						Total
			Number of			Weighted		Number of			Weighted			Number of			Weighted
			Shares			Average		Shares			Average			Shares			Average
						Grant Date					Grant Date						Grant Date
						Fair Value					Fair Value						Fair Value
	Balance at February 1, 2014			11,254		$	14.11		100		$	10.52			11,354		$	14.08
	Granted			5,435		$	15.23		1,277	*	$	14.98	*		6,712		$	15.18
	Vested			(5,652	)	$	13.95		(3	)	$	10.52			(5,655	)	$	13.95
	Canceled/Forfeited			(908	)	$	14.25		(110	)	$	10.96			(1,018	)	$	13.89

	Balance at November 1, 2014			10,129		$	14.82		1,264		$	14.99			11,393		$	14.84


	*	Amounts represent the target number of restricted stock units at grant date. For awards granted to our executive officers, up to 200% of the target restricted stock units may vest if the maximum level for financial and strategic goals is achieved.
Schedule of Cash Dividends	'
	The Company paid the following cash dividends:


			Three Months Ended					Nine Months Ended
			November 1,			November 2,		November 1,			November 2,
			2014			2013		2014			2013
	Cash dividend per share		$	0.06		$	0.06	$	0.18		$	0.18

	Total payment to shareholders (in thousands)		$	30,867		$	29,516	$	91,859		$	89,560

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	9 Months Ended
Share-Based Compensation (Tables)	Nov. 01, 2014
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						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Cost of goods sold	$	1,934		$	2,531		$	5,966		$	6,266
	Research and development		24,198			30,084			68,842			82,345
	Selling and marketing		2,855			3,738			8,400			10,778
	General and administrative		5,307			6,848			16,075			18,416

		$	34,294		$	43,201		$	99,283		$	117,805

Employee Stock Purchase Plan	'
Weighted Average Assumptions Used to Calculate Fair Value Awards	'

		Nine Months Ended
		November 1,			November 2,
		2014			2013
	Employee Stock Purchase Plan:
	Estimated fair value	$	4.13		$	3.45
	Volatility		32	%		40	%
	Expected term (in years)		1.3			1.3
	Risk-free interest rate		0.2	%		0.2	%
	Dividend yield		1.6	%		2.2	%
Time Based Option Award	'
Weighted Average Assumptions Used to Calculate Fair Value Awards	'
	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:


		Three Months Ended						Nine Months Ended
		November 1,			November 2,			November 1,			November 2,
		2014			2013			2014			2013
	Time-based Stock Options:
	Weighted average fair value	$	3.43		$	3.91		$	4.35		$	3.42
	Expected volatility		34	%		42	%		35	%		45	%
	Expected term (in years)		5			5			5			5
	Risk-free interest rate		1.7	%		1.5	%		1.6	%		0.8	%
	Expected dividend yield		1.8	%		2	%		1.6	%		2.4	%

Summary_of_Investments_Detail

Summary of Investments (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	$1,229,803	$1,020,271
Gross Unrealized Gains	2,363	3,062
Gross Unrealized Losses	-3,304	-3,399
Estimated Fair Value	1,228,862	1,019,934
Short-term Investments	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	1,217,303	1,001,121
Gross Unrealized Gains	2,363	3,062
Gross Unrealized Losses	-881	-528
Estimated Fair Value	1,218,785	1,003,655
Short-term Investments \| Corporate debt securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	842,487	587,095
Gross Unrealized Gains	2,121	2,789
Gross Unrealized Losses	-756	-370
Estimated Fair Value	843,852	589,514
Short-term Investments \| U.S. government and agency debt	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	234,649	301,423
Gross Unrealized Gains	136	128
Gross Unrealized Losses	-32	-72
Estimated Fair Value	234,753	301,479
Short-term Investments \| Asset-backed Securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	85,893	76,220
Gross Unrealized Gains	40	89
Gross Unrealized Losses	-67	-38
Estimated Fair Value	85,866	76,271
Short-term Investments \| Foreign government and agency debt	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	28,079	20,324
Gross Unrealized Gains	25	12
Gross Unrealized Losses	-20	-44
Estimated Fair Value	28,084	20,292
Short-term Investments \| Municipal debt securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	23,195	16,059
Gross Unrealized Gains	41	44
Gross Unrealized Losses	-6	-4
Estimated Fair Value	23,230	16,099
Short-term Investments \| Auction rate securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	3,000	'
Estimated Fair Value	3,000	'
Long-term investments	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	12,500	19,150
Gross Unrealized Losses	-2,423	-2,871
Estimated Fair Value	10,077	16,279
Long-term investments \| Auction rate securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	12,500	19,150
Gross Unrealized Losses	-2,423	-2,871
Estimated Fair Value	$10,077	$16,279

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	$1,229,803,000	$1,020,271,000
Gross Unrealized Losses	3,304,000	3,399,000
Cash, cash equivalents and short-term investments	2,400,000,000	'
Long-term investments	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	12,500,000	19,150,000
Gross Unrealized Losses	2,423,000	2,871,000
Long-term investments \| Auction rate securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	12,500,000	19,150,000
Gross Unrealized Losses	$2,423,000	$2,871,000

Gross_Realized_Gains_and_Losse

Gross Realized Gains and Losses on Sale of Available-for-Sales Securities (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Gross realized gains	$415	$497	$1,367	$1,289
Gross realized losses	-25	-216	-50	-253
Total net realized gains	$390	$281	$1,317	$1,036

Contractual_Maturities_of_Avai

Contractual Maturities of Available for Sale Securities (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Amortized Cost	'	'
Due in one year or less	$356,973	$309,543
Due between one and five years	848,587	686,062
Due over five years	24,243	24,666
Amortized Cost	1,229,803	1,020,271
Estimated Fair Value	'	'
Due in one year or less	357,266	309,861
Due between one and five years	849,763	688,280
Due over five years	21,833	21,793
Estimated Fair Value	$1,228,862	$1,019,934

Summary_of_Investments_Gross_U

Summary of Investments Gross Unrealized Losses and Fair Value (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	$433,369	$237,908
Less than 12 months Unrealized Losses	-871	-505
12 months or more Fair Value	11,069	20,296
12 months or more Unrealized Losses	-2,433	-2,894
Total Fair Value	444,438	258,204
Total Unrealized Losses	-3,304	-3,399
Corporate debt securities	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	318,039	110,903
Less than 12 months Unrealized Losses	-746	-366
12 months or more Fair Value	992	2,105
12 months or more Unrealized Losses	-10	-4
Total Fair Value	319,031	113,008
Total Unrealized Losses	-756	-370
U.S. government and agency debt	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	59,046	93,118
Less than 12 months Unrealized Losses	-32	-72
Total Fair Value	59,046	93,118
Total Unrealized Losses	-32	-72
Asset-backed Securities	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	36,510	18,865
Less than 12 months Unrealized Losses	-67	-19
12 months or more Fair Value	'	1,912
12 months or more Unrealized Losses	'	-19
Total Fair Value	36,510	20,777
Total Unrealized Losses	-67	-38
Foreign government and agency debt	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	16,572	14,299
Less than 12 months Unrealized Losses	-20	-44
Total Fair Value	16,572	14,299
Total Unrealized Losses	-20	-44
Municipal debt securities	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	3,202	723
Less than 12 months Unrealized Losses	-6	-4
Total Fair Value	3,202	723
Total Unrealized Losses	-6	-4
Auction rate securities	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
12 months or more Fair Value	10,077	16,279
12 months or more Unrealized Losses	-2,423	-2,871
Total Fair Value	10,077	16,279
Total Unrealized Losses	($2,423)	($2,871)

Inventories_Detail

Inventories (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Inventory [Line Items]	'	'
Work-in-process	$197,671	$195,495
Finished goods	158,746	152,366
Total inventories	$356,417	$347,861

Property_and_Equipment_Net_Det

Property and Equipment Net (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$1,022,962	$985,064
Less: Accumulated depreciation and amortization	-679,861	-628,899
Total property and equipment, net	343,101	356,165
Machinery and equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	594,702	562,038
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	97,452	96,096
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	49,786	49,645
Leasehold improvements	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	50,187	49,060
Furniture and fixtures	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	27,746	27,621
Construction in progress	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$5,396	$2,911

Other_Non_Current_Assets_Detai

Other Non Current Assets (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]	'	'
Technology and other licenses	$68,819	$83,521
Deferred tax assets	23,442	19,282
Investments in privately-held companies	9,267	14,565
Prepaid land use rights	13,510	13,744
Deposits	11,918	12,433
Other	18,083	16,821
Total other non-current assets	$145,039	$160,366

Accrued_Liabilities_Detail

Accrued Liabilities (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Schedule of Accrued Liabilities [Line Items]	'	'
Accrued rebates	$51,407	$61,616
Accrued royalties	25,426	36,568
Technology license obligations	17,079	18,482
Accrued legal expense	9,857	14,589
Other	36,315	30,507
Total accrued liabilities	$140,084	$161,762

Other_Long_Term_Liabilities_De

Other Long Term Liabilities (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Schedule of Other Liabilities [Line Items]	'	'
Technology license obligations	$19,085	$28,959
Long-term accrued employee compensation	4,622	4,370
Other	12,615	9,140
Other non-current liabilities	$36,322	$42,469

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	$597	$1,148
Other comprehensive income before reclassifications	'	'	-1,088	2,516
Amounts reclassified from accumulated other comprehensive income	'	'	-2,473	-3,607
Other comprehensive income (loss), net	-3,591	1,629	-3,561	-1,091
Ending Balance	-2,964	57	-2,964	57
Unrealized Gain (Loss) on Marketable Securities	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	2,534	2,742
Other comprehensive income before reclassifications	'	'	67	-276
Amounts reclassified from accumulated other comprehensive income	'	'	-1,119	-923
Other comprehensive income (loss), net	'	'	-1,052	-1,199
Ending Balance	1,482	1,543	1,482	1,543
Unrealized Gain (Loss) on Auction Rate Securities	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	-2,871	-2,681
Other comprehensive income before reclassifications	'	'	448	-311
Other comprehensive income (loss), net	'	'	448	-311
Ending Balance	-2,423	-2,992	-2,423	-2,992
Unrealized Gain (Loss) on Cash Flow Hedges	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	934	1,087
Other comprehensive income before reclassifications	'	'	-1,603	3,103
Amounts reclassified from accumulated other comprehensive income	'	'	-1,354	-2,684
Other comprehensive income (loss), net	'	'	-2,957	419
Ending Balance	($2,023)	$1,506	($2,023)	$1,506

Amounts_Reclassified_from_Accu

Amounts Reclassified from Accumulated Other Comprehensive Income by Components (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Interest and other income, net	$4,764	$1,536	$18,952	$12,949
Cost of goods sold	-454,974	-464,981	-1,426,575	-1,186,478
Research and development	-288,435	-296,291	-878,562	-867,985
Selling and marketing	-34,410	-37,496	-106,717	-116,033
General and administrative	-33,473	-26,589	-95,379	-80,104
Net income	115,304	103,156	353,653	218,191
Reclassification out of Accumulated Other Comprehensive Income	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Net income	614	1,127	2,473	3,607
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	264	380	1,119	923
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Gain (Loss) on Cash Flow Hedges	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Cost of goods sold	22	41	85	149
Research and development	298	648	1,156	2,319
Selling and marketing	29	53	110	198
General and administrative	$1	$5	$3	$18

Computations_of_Basic_and_Dilu

Computations of Basic and Diluted Net Income Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Numerator:	'	'	'	'
Net income	$115,304	$103,156	$353,653	$218,191
Denominator:	'	'	'	'
Weighted average shares - basic	513,859	491,979	510,261	496,151
Effect of dilutive securities:	'	'	'	'
Share-based awards	6,048	9,210	10,048	6,250
Weighted average shares - diluted	519,907	501,189	520,309	502,401
Basic	$0.22	$0.21	$0.69	$0.44
Diluted	$0.22	$0.21	$0.68	$0.43
Time-based options	'	'	'	'
Effect of dilutive securities:	'	'	'	'
Weighted average shares outstanding from stock options	25,092	43,167	22,331	39,854
Weighted average exercise price	$17.19	$14.71	$17.61	$15.18
Market Based Option Award	'	'	'	'
Effect of dilutive securities:	'	'	'	'
Weighted average shares outstanding from stock options	2,245	2,719	2,306	2,732
Weighted average exercise price	$15.43	$15.42	$15.43	$15.43
Stock Options	'	'	'	'
Effect of dilutive securities:	'	'	'	'
Weighted average shares outstanding from stock options	27,337	45,886	24,637	42,586
Weighted average exercise price	$17.04	$14.75	$17.41	$15.20

Notional_Amounts_of_Outstandin

Notional Amounts of Outstanding Foreign Currency Forward Contracts (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Foreign Exchange Buy Contracts	'	'
Derivative [Line Items]	'	'
Derivative, notional amount	$72,032	$49,097
Foreign Exchange Buy Contracts \| Israeli shekel	'	'
Derivative [Line Items]	'	'
Derivative, notional amount	51,047	39,670
Foreign Exchange Buy Contracts \| China yuan	'	'
Derivative [Line Items]	'	'
Derivative, notional amount	15,614	'
Foreign Exchange Buy Contracts \| Euro	'	'
Derivative [Line Items]	'	'
Derivative, notional amount	5,371	5,718
Foreign Exchange Buy Contracts \| Swedish krona	'	'
Derivative [Line Items]	'	'
Derivative, notional amount	'	3,709
Foreign Exchange Sell Contracts	'	'
Derivative [Line Items]	'	'
Derivative, notional amount	5,376	'
Foreign Exchange Sell Contracts \| Euro	'	'
Derivative [Line Items]	'	'
Derivative, notional amount	$5,376	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail)	Nov. 01, 2014
Fair Value, Measurement Inputs, Disclosure [Line Items]	'
Percentage of total amount of assets measured using Level 3 valuation methodologies to total assets	0.20%

Financial_Assets_that_were_Acc

Financial Assets that were Accounted for at Fair Value (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Portion of Carrying Value Measured at Fair Value	'	'
Assets	'	'
Total assets	$1,496,397	$1,294,100
Portion of Carrying Value Measured at Fair Value \| Accrued Liabilities \| Foreign currency forward contracts	'	'
Liabilities	'	'
Accrued liabilities	2,402	26
Cash equivalents \| Portion of Carrying Value Measured at Fair Value \| U.S. government and agency debt	'	'
Assets	'	'
Cash equivalents	12,200	11,999
Cash equivalents \| Portion of Carrying Value Measured at Fair Value \| Money market funds	'	'
Assets	'	'
Cash equivalents	16,290	2,804
Cash equivalents \| Portion of Carrying Value Measured at Fair Value \| Time deposits	'	'
Assets	'	'
Cash equivalents	206,580	247,958
Cash equivalents \| Portion of Carrying Value Measured at Fair Value \| Municipal debt securities	'	'
Assets	'	'
Cash equivalents	1,908	4,800
Cash equivalents \| Portion of Carrying Value Measured at Fair Value \| Corporate debt securities	'	'
Assets	'	'
Cash equivalents	28,332	3,400
Short-term Investments \| Portion of Carrying Value Measured at Fair Value \| U.S. government and agency debt	'	'
Assets	'	'
Investments	234,753	301,479
Short-term Investments \| Portion of Carrying Value Measured at Fair Value \| Municipal debt securities	'	'
Assets	'	'
Investments	23,230	16,099
Short-term Investments \| Portion of Carrying Value Measured at Fair Value \| Corporate debt securities	'	'
Assets	'	'
Investments	843,852	589,514
Short-term Investments \| Portion of Carrying Value Measured at Fair Value \| Asset-backed Securities	'	'
Assets	'	'
Investments	85,866	76,271
Short-term Investments \| Portion of Carrying Value Measured at Fair Value \| Foreign government and agency debt	'	'
Assets	'	'
Investments	28,084	20,292
Short-term Investments \| Portion of Carrying Value Measured at Fair Value \| Auction rate securities	'	'
Assets	'	'
Investments	3,000	'
Prepaid expenses and other current assets \| Portion of Carrying Value Measured at Fair Value \| Foreign currency forward contracts	'	'
Assets	'	'
Prepaid expenses and other current assets	384	1,012
Long-term investments \| Portion of Carrying Value Measured at Fair Value \| Auction rate securities	'	'
Assets	'	'
Investments	10,077	16,279
Other non-current assets \| Portion of Carrying Value Measured at Fair Value \| Severance Pay Fund	'	'
Assets	'	'
Other non-current asset	1,841	2,193
Level 1 \| Items measured at fair value	'	'
Assets	'	'
Total assets	263,243	316,282
Level 1 \| Cash equivalents \| Items measured at fair value \| U.S. government and agency debt	'	'
Assets	'	'
Cash equivalents	12,200	11,999
Level 1 \| Cash equivalents \| Items measured at fair value \| Money market funds	'	'
Assets	'	'
Cash equivalents	16,290	2,804
Level 1 \| Short-term Investments \| Items measured at fair value \| U.S. government and agency debt	'	'
Assets	'	'
Investments	234,753	301,479
Level 2 \| Items measured at fair value	'	'
Assets	'	'
Total assets	1,223,077	961,539
Level 2 \| Items measured at fair value \| Accrued Liabilities \| Foreign currency forward contracts	'	'
Liabilities	'	'
Accrued liabilities	2,402	26
Level 2 \| Cash equivalents \| Items measured at fair value \| Time deposits	'	'
Assets	'	'
Cash equivalents	206,580	247,958
Level 2 \| Cash equivalents \| Items measured at fair value \| Municipal debt securities	'	'
Assets	'	'
Cash equivalents	1,908	4,800
Level 2 \| Cash equivalents \| Items measured at fair value \| Corporate debt securities	'	'
Assets	'	'
Cash equivalents	28,332	3,400
Level 2 \| Short-term Investments \| Items measured at fair value \| Municipal debt securities	'	'
Assets	'	'
Investments	23,230	16,099
Level 2 \| Short-term Investments \| Items measured at fair value \| Corporate debt securities	'	'
Assets	'	'
Investments	843,852	589,514
Level 2 \| Short-term Investments \| Items measured at fair value \| Asset-backed Securities	'	'
Assets	'	'
Investments	85,866	76,271
Level 2 \| Short-term Investments \| Items measured at fair value \| Foreign government and agency debt	'	'
Assets	'	'
Investments	28,084	20,292
Level 2 \| Short-term Investments \| Items measured at fair value \| Auction rate securities	'	'
Assets	'	'
Investments	3,000	'
Level 2 \| Prepaid expenses and other current assets \| Items measured at fair value \| Foreign currency forward contracts	'	'
Assets	'	'
Prepaid expenses and other current assets	384	1,012
Level 2 \| Other non-current assets \| Items measured at fair value \| Severance Pay Fund	'	'
Assets	'	'
Other non-current asset	1,841	2,193
Level 3 \| Items measured at fair value	'	'
Assets	'	'
Total assets	10,077	16,279
Level 3 \| Long-term investments \| Items measured at fair value \| Auction rate securities	'	'
Assets	'	'
Investments	$10,077	$16,279

Summary_of_Change_in_Fair_Valu

Summary of Change in Fair Values for Level Three Items (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Beginning balance	$16,279	$16,769
Sales and redemptions	-3,650	-300
Transfer out	-3,000	'
Unrealized losses included in accumulated other comprehensive income	448	-311
Ending balance	$10,077	$16,158

Acquired_Intangible_Assets_Net2

Acquired Intangible Assets Net (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amounts	$81,490	$84,876
Accumulated Amortization and Write-Offs	-47,207	-35,841
Net Carrying Amount	34,283	49,035
In-process research and development	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amounts, Indefinite-Lived	'	3,386
Accumulated Amortization and Write-Offs, Indefinite-Lived	0	0
Net Carrying Amount, Indefinite-Lived	'	3,386
Purchased technology	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amounts, Finite-Lived	49,240	49,240
Accumulated Amortization and Write-Offs	-27,369	-20,634
Net Carrying Amount, Finite-Lived	21,871	28,606
Purchased technology \| Minimum	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Useful Lives	'4 years	'
Purchased technology \| Maximum	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Useful Lives	'6 years	'
Core technology	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amounts, Finite-Lived	2,350	2,350
Accumulated Amortization and Write-Offs	-1,850	-1,583
Net Carrying Amount, Finite-Lived	500	767
Core technology \| Minimum	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Useful Lives	'5 years	'
Core technology \| Maximum	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Useful Lives	'8 years	'
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	-763	-568
Net Carrying Amount, Finite-Lived	537	732
Customer intangibles	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amounts, Finite-Lived	28,600	28,600
Accumulated Amortization and Write-Offs	-17,225	-13,056
Net Carrying Amount, Finite-Lived	$11,375	$15,544
Customer intangibles \| Minimum	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Useful Lives	'5 years	'
Customer intangibles \| Maximum	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Useful Lives	'6 years	'

Acquired_Intangible_Assets_Net3

Acquired Intangible Assets, Net - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Nov. 01, 2014
Goodwill and Intangible Assets Disclosure [Line Items]	'
Write off of acquired IPR&D	$3.40

Future_Amortization_Expense_of

Future Amortization Expense of Identified Intangibles (Detail) (In Process Research and Development Excluded, USD $)	Nov. 01, 2014
In Thousands, unless otherwise specified	Nov. 01, 2014
In Process Research and Development Excluded	'
Fiscal Year	'
Remainder of fiscal 2015	$3,585
2016	12,212
2017	11,027
2018	5,599
2019	1,860
Thereafter	0
Net Carrying Amount, Finite-Lived	$34,283

Restructuring_Charges_Detail

Restructuring Charges (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	$1,202	'	$7,008	'
Restructuring charges	1,202	4,208	10,411	4,614
Severance and Related Costs	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	72	'	5,107	'
Facilities and Related Costs	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	1,117	'	1,815	'
Other Exit-Related Costs	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	13	'	86	'
Research and development	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	87	2,886	5,181	2,886
Selling and marketing	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	'	795	'	795
General and administrative	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	1,115	527	1,844	933
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	'	'	$17	'

Reconciliation_of_Beginning_an

Reconciliation of Beginning and Ending Restructuring Liability Balances by Major Type of Costs (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 01, 2014
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring liabilities, beginning of balance	'	$2,453
Restructuring charges	1,202	7,008
Net cash payments	'	-7,057
Restructuring liabilities, ending balance	2,404	2,404
Severance and Related Costs	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring liabilities, beginning of balance	'	51
Restructuring charges	72	5,107
Net cash payments	'	-5,124
Restructuring liabilities, ending balance	34	34
Facilities and Related Costs	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring liabilities, beginning of balance	'	2,383
Restructuring charges	1,117	1,815
Net cash payments	'	-1,828
Restructuring liabilities, ending balance	2,370	2,370
Other Exit-Related Costs	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring liabilities, beginning of balance	'	19
Restructuring charges	13	86
Net cash payments	'	($105)

Restructuring_Additional_Infor

Restructuring - Additional Information (Detail) (Through Fiscal Year 2018)	9 Months Ended
	Nov. 01, 2014
Through Fiscal Year 2018	'
Restructuring Cost and Reserve [Line Items]	'
Year of expected payments under lease obligations	'2018

Income_Tax_Additional_Informat

Income Tax - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Income Taxes [Line Items]	'	'	'	'
Current income tax liability	$4.50	$4.30	$15.10	$11.30
Net reduction in unrecognized tax benefits	'	-7.3	-8.9	-23.8
Tax benefit from an increase in deferred tax asset due to change in negotiated development and expansion incentive	0.9	0.9	11.5	0.9
Reduction in unrecognized tax benefits arising from the expiration of statute of limitations	'	'	13.2	'
Increase in current year unrecognized tax benefit estimates	'	'	4.3	'
Tax benefit due to return-to-provision adjustments	0.4	2.5	0.4	2.5
Settlements of audits in non-U.S. jurisdictions	'	'	'	0.7
Uncertain tax positions decrease from the lapse of the statutes of limitation in various jurisdictions during the next 12 months	-17	'	-17	'
Tax incentives, tax savings amount	1.8	5.7	12.3	14.9
Tax incentives, per share effect on earning	$0.01	'	$0.02	'
Cash, cash equivalents and short-term investments	2,400	'	2,400	'
Undistributed earnings of foreign subsidiaries	500	'	500	'
Foreign Subsidiaries	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Cash, cash equivalents and short-term investments	900	'	900	'
Increase (decrease) in tax expense in the event of undistributed earnings needed by the parent company or no longer considered indefinitely reinvested outside of Bermuda	'	'	150	'
Maximum	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Tax incentives, per share effect on earning	'	$0.01	'	$0.03
Audit Settlement One	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Settlements of audits in non-U.S. jurisdictions	'	'	'	3.5
Audit Settlement Two	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Settlements of audits in non-U.S. jurisdictions	'	'	'	$4.10

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	Nov. 01, 2014	Jun. 30, 2010	Mar. 31, 2014	Dec. 26, 2012	Nov. 01, 2014	Dec. 26, 2012	14-May-14	Nov. 14, 2014	Nov. 14, 2014	Nov. 01, 2014
		Lake Cherokee Patent I Litigation	Carnegie Mellon Litigation	Carnegie Mellon Litigation	Carnegie Mellon Litigation	Carnegie Mellon Litigation	Surety Bond	Surety Bond	Commitment Letter	Manufacturing Expense
								Subsequent Event	Subsequent Event
Commitments and Contingencies Disclosure [Line Items]	'	'	'	'	'	'	'	'	'	'
Purchase commitment, outstanding commitment	'	'	'	'	'	'	'	'	'	$213,900,000
Accrued liability related to legal proceedings	3,200,000	'	'	'	'	'	'	'	'	'
Date of lawsuit filed	'	'	'	'	6-Mar-09	'	'	'	'	'
Loss contingency, awarded amount	'	'	1,540,000,000	1,170,000,000	'	'	'	'	'	'
Pre-judgment interest	'	'	'	'	'	322,000,000	'	'	'	'
Additional royalties	'	'	'	'	350,000,000	'	'	'	'	'
Loss contingency, range of possible loss, minimum	'	'	'	'	0	'	'	'	'	'
Loss contingency, damages claim	'	193,000,000	'	'	'	'	'	'	'	'
Bond	'	'	'	'	'	'	1,540,000,000	216,000,000	95,000,000	'
Carrying value of pledged assets	$147,000,000	'	'	'	'	'	'	'	'	'

Stock_Option_Plan_Activity_Det

Stock Option Plan Activity (Detail) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Nov. 01, 2014
Options Outstanding	'
Beginning Balance	51,779
Granted	6,177
Exercised	-3,052
Canceled/Forfeited	-4,284
Ending Balance	50,620
Weighted Average Exercise Price	'
Beginning Balance	$13.51
Granted	$15.35
Exercised	$10.44
Canceled/Forfeited	$14.79
Ending Balance	$13.81
Time Based Option Award	'
Options Outstanding	'
Beginning Balance	49,156
Granted	6,177
Exercised	-3,052
Canceled/Forfeited	-3,896
Ending Balance	48,385
Vested or expected to vest at November 1, 2014	45,280
Exercisable at November 1, 2014	23,453
Weighted Average Exercise Price	'
Beginning Balance	$13.40
Granted	$15.35
Exercised	$10.44
Canceled/Forfeited	$14.73
Ending Balance	$13.73
Vested or expected to vest at November 1, 2014	$13.79
Exercisable at November 1, 2014	$15.15
Market Based Option Award	'
Options Outstanding	'
Beginning Balance	2,623
Canceled/Forfeited	-388
Ending Balance	2,235
Weighted Average Exercise Price	'
Beginning Balance	$15.43
Canceled/Forfeited	$15.43
Ending Balance	$15.43

Shareholders_Equity_Additional

Shareholders' Equity - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

Share data in Millions, except Per Share data, unless otherwise specified

Nov. 01, 2014

Nov. 02, 2013

Nov. 01, 2014

Nov. 02, 2013

Oct. 31, 2014

Nov. 20, 2014

Nov. 01, 2014

Nov. 02, 2013

Nov. 01, 2014

Nov. 02, 2013

Nov. 01, 2014

Apr. 30, 2014

Nov. 01, 2014

Nov. 02, 2013

Nov. 01, 2014

Nov. 02, 2013

Subsequent Event

Time Based Option Award

Market Based Option Award

Restricted Stock Units (RSUs)

Performance Based Restricted Stock Unit

Executive Performance Awards

Employee Stock Purchase Plan, 2000 Restated Plan

Vesting Period One

Vesting Period Two

Financial Performance RSU

Strategic Performance Award

First Anniversary

Second Anniversary

First Anniversary

Second Anniversary

Stockholders Equity Note [Line Items]

Options vested and expected to vest, aggregate intrinsic value

$72,900,000

Options vested and expected to vest, weighted average remaining contractual term (in years)

'6 years

'6 years 6 months

Options exercisable, aggregate intrinsic value

36,300,000

Options exercisable, weighted average remaining contractual term (in years)

'3 years 8 months 12 days

Aggregate intrinsic value of stock options exercised

1,500,000

5,600,000

15,100,000

21,700,000

Closing stock price

$13.44

Unrecognized share based compensation cost

60,300,000

99,100,000

6,100,000

Unrecognized share based compensation cost, weighted-average period of recognition

'2 years 6 months

'1 year 7 months 6 days

Performance awards vesting percentage

50.00%

Performance awards vesting period

'2 years

Performance awards vesting Date

1-Apr-15

1-Apr-16

Restricted stock units, aggregate intrinsic value

140,600,000

Restricted stock units vested and expected to vest

10.5

Employee stock purchase plan, shares issued

5.2

Employee stock purchase plan, weighted-average price

$7.58

$7.34

$7.58

$7.34

Share repurchase program, shares repurchased

3.7

6.1

3.7

33.2

Share repurchase program, amount repurchased

45,000,000

71,300,000

45,000,000

354,100,000

Share repurchase program, cumulative shares repurchased

220.5

Share repurchase program, total amount of repurchases

2,800,000,000

Share repurchase program, remaining available for future share repurchases

$213,400,000

Dividend per share, declared

$0.06

$0.18

$0.06

Dividends declared, date to be paid

29-Dec-14

Dividends declared, date of record

11-Dec-14

Activity_Related_to_Non_Vested

Activity Related to Non Vested Portion of Restricted Stock Units (Detail) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Nov. 01, 2014
Time Based Restricted Units	'
Restricted Stock Units Outstanding	'
Beginning Balance	11,254
Granted	5,435
Vested	-5,652
Canceled/Forfeited	-908
Ending Balance	10,129
Weighted Average Grant Date Fair Value	'
Beginning Balance	$14.11
Granted	$15.23
Vested	$13.95
Canceled/Forfeited	$14.25
Ending Balance	$14.82
Performance Based Restricted Stock Unit	'
Restricted Stock Units Outstanding	'
Beginning Balance	100
Granted	1,277	[1]
Vested	-3
Canceled/Forfeited	-110
Ending Balance	1,264
Weighted Average Grant Date Fair Value	'
Beginning Balance	$10.52
Granted	$14.98	[1]
Vested	$10.52
Canceled/Forfeited	$10.96
Ending Balance	$14.99
Restricted Stock Units (RSUs)	'
Restricted Stock Units Outstanding	'
Beginning Balance	11,354
Granted	6,712
Vested	-5,655
Canceled/Forfeited	-1,018
Ending Balance	11,393
Weighted Average Grant Date Fair Value	'
Beginning Balance	$14.08
Granted	$15.18
Vested	$13.95
Canceled/Forfeited	$13.89
Ending Balance	$14.84

[1]	Amounts represent the target number of restricted stock units at grant date. For awards granted to our executive officers, up to 200% of the target restricted stock units may vest if the maximum level for financial and strategic goals is achieved.

Activity_Related_to_Non_Vested1

Activity Related to Non Vested Portion of Restricted Stock Units (Parenthetical) (Detail) (Maximum)	9 Months Ended
	Nov. 01, 2014
Maximum	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock unit vested	200.00%

Schedule_of_Cash_Dividends_Det

Schedule of Cash Dividends (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Cash dividend	'	'	'	'
Cash dividend per share	$0.06	$0.06	$0.18	$0.18
Total payment to shareholders (in thousands)	$30,867	$29,516	$91,859	$89,560

Total_Stock_Compensation_by_Ex

Total Stock Compensation by Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Share-based compensation expense	$34,294	$43,201	$99,283	$117,805
Cost of goods sold	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Share-based compensation expense	1,934	2,531	5,966	6,266
Research and development	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Share-based compensation expense	24,198	30,084	68,842	82,345
Selling and marketing	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Share-based compensation expense	2,855	3,738	8,400	10,778
General and administrative	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Share-based compensation expense	$5,307	$6,848	$16,075	$18,416

Share_Based_Compensation_Addit

Share Based Compensation - Additional Information (Detail) (USD $)	Nov. 01, 2014	Feb. 01, 2014
In Millions, unless otherwise specified	Nov. 01, 2014	Feb. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Stock-based compensation capitalized in inventory	$1.50	$1.70

Weighted_Average_Assumptions_U

Weighted Average Assumptions Used to Calculate Fair Value of Time Based Equity Award (Detail) (Time Based Option Award, USD $)	3 Months Ended		9 Months Ended
	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Time Based Option Award	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Weighted average fair value	$3.43	$3.91	$4.35	$3.42
Expected volatility	34.00%	42.00%	35.00%	45.00%
Expected term (in years)	'5 years	'5 years	'5 years	'5 years
Risk-free interest rate	1.70%	1.50%	1.60%	0.80%
Expected dividend yield	1.80%	2.00%	1.60%	2.40%

Valuation_Assumptions_Detail

Valuation Assumptions (Detail) (Employee Stock Purchase Plan, USD $)	9 Months Ended
	Nov. 01, 2014	Nov. 02, 2013
Employee Stock Purchase Plan	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Estimated fair value	$4.13	$3.45
Volatility	32.00%	40.00%
Expected term (in years)	'1 year 3 months 18 days	'1 year 3 months 18 days
Risk-free interest rate	0.20%	0.20%
Dividend yield	1.60%	2.20%