Marvell Technology 10-K27 Mar 142014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Feb. 01, 2014	Mar. 20, 2014	Aug. 02, 2013
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	1-Feb-14	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'MRVL	'	'
Entity Registrant Name	'MARVELL TECHNOLOGY GROUP LTD	'	'
Entity Central Index Key	'0001058057	'	'
Current Fiscal Year End Date	'--02-01	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	503,400,000	'
Entity Public Float	'	'	$4,026,000,000

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Current assets:	'	'
Cash and cash equivalents	$965,750	$751,953
Short-term investments	1,003,655	1,167,037
Accounts receivable, net of provision for sales returns and allowances of $2,294 and $7,921 in fiscal 2014 and 2013, respectively	453,496	330,238
Inventories	347,861	250,420
Prepaid expenses and other current assets	56,952	77,282
Deferred income taxes	11,506	8,416
Total current assets	2,839,220	2,585,346
Property and equipment, net	356,165	372,971
Long-term investments	16,279	16,769
Goodwill	2,029,945	2,032,138
Acquired intangible assets, net	49,035	89,655
Other non-current assets	160,366	164,885
Total assets	5,451,010	5,261,764
Current liabilities:	'	'
Accounts payable	316,389	286,552
Accrued liabilities	161,762	143,991
Accrued employee compensation	111,408	117,195
Deferred income	61,747	60,150
Total current liabilities	651,306	607,888
Non-current income taxes payable	81,325	112,871
Other non-current liabilities	42,469	56,410
Total liabilities	775,100	777,169
Commitments and contingencies (Note 10)	'	'
Shareholders' equity:	'	'
Preferred stock, $0.002 par value; 8,000 shares authorized; no shares issued and outstanding	'	'
Common stock, $0.002 par value; 992,000 shares authorized; 502,405 and 508,338 shares issued and outstanding in fiscal 2014 and 2013, respectively	1,005	1,017
Additional paid-in capital	2,941,650	2,945,643
Accumulated other comprehensive income	597	1,148
Retained earnings	1,732,658	1,536,787
Total shareholders' equity	4,675,910	4,484,595
Total liabilities and shareholders' equity	$5,451,010	$5,261,764

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, except Per Share data, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Accounts receivable, provision for sales return and allowances	$2,294	$7,921
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	8,000	8,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	992,000	992,000
Common stock, shares issued	502,405	508,338
Common stock, shares outstanding	502,405	508,338

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Net revenue	$3,404,400	$3,168,630	$3,393,040
Operating costs and expenses:	'	'	'
Cost of goods sold	1,663,730	1,493,497	1,465,805
Research and development	1,156,885	1,057,445	1,013,678
Selling and marketing	152,698	161,817	159,434
General and administrative	106,471	108,514	100,620
Amortization and write-off of acquired intangible assets	43,925	52,700	49,357
Total operating costs and expenses	3,123,709	2,873,973	2,788,894
Operating income	280,691	294,657	604,146
Interest and other income, net	25,566	15,533	14,913
Income before income taxes	306,257	310,190	619,059
Provision (benefit) for income taxes	-9,063	3,605	3,968
Net income	$315,320	$306,585	$615,091
Net income per share:	'	'	'
Basic	$0.64	$0.55	$1.01
Diluted	$0.63	$0.54	$0.99
Weighted average shares:	'	'	'
Basic	496,518	555,310	607,857
Diluted	504,413	563,123	623,268
Cash dividends declared per share	$0.24	$0.18	'

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Net income	$315,320	$306,585	$615,091
Other comprehensive income (loss), net of tax:	'	'	'
Net change in unrealized gain (loss) on marketable securities	-208	-960	198
Net change in unrealized gain (loss) on auction rate securities	-190	-1,396	339
Net change in unrealized gain (loss) on cash flow hedges	-153	2,728	-848
Other	'	'	-5
Net current-period other comprehensive income (loss)	-551	372	-316
Comprehensive income	$314,769	$306,957	$614,775

CONSOLIDATED_STATEMENTS_OF_SHA

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $)	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings
In Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings
Beginning Balance at Jan. 29, 2011	$5,521,869	$1,319	$4,805,586	$1,092	$713,872
Beginning Balance (in shares) at Jan. 29, 2011	'	659,372	'	'	'
Shares issued pursuant to stock options and awards, net (in shares)	'	7,210	'	'	'
Shares issued pursuant to stock options and awards, net	37,003	14	36,989	'	'
Issuance of common stock under the employee stock purchase plan (in shares)	'	4,875	'	'	'
Issuance of common stock under the employee stock purchase plan	60,854	10	60,844	'	'
Share-based compensation	120,390	'	120,390	'	'
Tax (deficiency) benefit from employee stock transactions	3	'	3	'	'
Repurchase of common stock (In Shares)	'	-87,786	'	'	'
Repurchase of common stock	-1,340,876	-176	-1,340,700	'	'
Net income	615,091	'	'	'	615,091
Other comprehensive income (loss)	-316	'	'	-316	'
Ending Balance at Jan. 28, 2012	5,014,018	1,167	3,683,112	776	1,328,963
Ending Balance (in shares) at Jan. 28, 2012	'	583,671	'	'	'
Shares issued pursuant to stock options and awards, net (in shares)	'	8,090	'	'	'
Shares issued pursuant to stock options and awards, net	28,411	17	28,394	'	'
Issuance of common stock under the employee stock purchase plan (in shares)	'	7,578	'	'	'
Issuance of common stock under the employee stock purchase plan	66,426	15	66,411	'	'
Share-based compensation	126,683	'	126,683	'	'
Tax (deficiency) benefit from employee stock transactions	-52	'	-52	'	'
Repurchase of common stock (In Shares)	'	-91,001	'	'	'
Repurchase of common stock	-959,087	-182	-958,905	'	'
Cash dividends declared and paid (cumulatively $0.24 and $0.18 per share in fiscal 2014 and 2013 respectively)	-98,761	'	'	'	-98,761
Net income	306,585	'	'	'	306,585
Other comprehensive income (loss)	372	'	'	372	'
Ending Balance at Feb. 02, 2013	4,484,595	1,017	2,945,643	1,148	1,536,787
Ending Balance (in shares) at Feb. 02, 2013	'	508,338	'	'	'
Shares issued pursuant to stock options and awards, net (in shares)	'	17,479	'	'	'
Shares issued pursuant to stock options and awards, net	122,427	35	122,392	'	'
Issuance of common stock under the employee stock purchase plan (in shares)	'	9,701	'	'	'
Issuance of common stock under the employee stock purchase plan	71,663	19	71,644	'	'
Share-based compensation	156,126	'	156,126	'	'
Tax (deficiency) benefit from employee stock transactions	-88	'	-88	'	'
Repurchase of common stock (In Shares)	'	-33,113	'	'	'
Repurchase of common stock	-354,133	-66	-354,067	'	'
Cash dividends declared and paid (cumulatively $0.24 and $0.18 per share in fiscal 2014 and 2013 respectively)	-119,449	'	'	'	-119,449
Net income	315,320	'	'	'	315,320
Other comprehensive income (loss)	-551	'	'	-551	'
Ending Balance at Feb. 01, 2014	$4,675,910	$1,005	$2,941,650	$597	$1,732,658
Ending Balance (in shares) at Feb. 01, 2014	'	502,405	'	'	'

CONSOLIDATED_STATEMENTS_OF_SHA1

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Feb. 01, 2014	Feb. 02, 2013
Cash dividends declared and paid	$0.24	$0.18

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Cash flows from operating activities:	'	'	'
Net income	$315,320	$306,585	$615,091
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Depreciation and amortization	102,752	91,028	88,454
Share-based compensation	155,873	127,280	119,863
Amortization and write-off of acquired intangible assets	44,006	52,700	49,357
Gain on sale of business	-6,975	'	'
Other expense, net	8,178	7,392	15,190
Excess tax benefits from share-based compensation	-20	-58	-164
Deferred income tax	3,919	7,026	-3,245
Changes in assets and liabilities, net of assets acquired and liabilities assumed in acquisitions:	'	'	'
Accounts receivable	-123,258	77,025	54,550
Inventories	-97,188	103,102	-101,109
Prepaid expenses and other assets	19,458	-6,894	30,736
Accounts payable	39,791	-24,304	-47,095
Accrued liabilities and other non-current liabilities	-9,627	8,014	-21,614
Accrued employee compensation	-5,787	-20,050	-12,565
Deferred income	1,597	191	-16,202
Net cash provided by operating activities	448,039	729,037	771,247
Cash flows from investing activities:	'	'	'
Purchases of available-for-sale securities	-837,892	-1,543,902	-1,851,696
Sales and maturities of available-for-sale securities	995,039	1,835,655	1,462,164
Investments in privately-held companies	-1,869	-8,750	-4,003
Cash paid for acquisitions, net	-2,551	-1,000	-93,916
Proceeds from sale of business	6,306	'	'
Purchases of technology licenses	-17,647	-35,002	-13,823
Purchases of property and equipment	-66,593	-68,186	-88,779
Net cash provided by (used in) investing activities	74,793	178,815	-590,053
Cash flows from financing activities:	'	'	'
Repurchase of common stock	-376,285	-936,935	-1,340,876
Proceeds from employee stock plans	204,962	104,936	106,039
Minimum tax withholding paid on behalf of employees for net share settlement	-10,872	-10,099	-8,182
Dividend payments to shareholders	-119,449	-98,761	'
Payments on technology license obligations	-7,411	'	'
Principal payments on capital lease	'	'	-511
Excess tax benefits from share-based compensation	20	58	164
Net cash used in financing activities	-309,035	-940,801	-1,243,366
Net increase (decrease) in cash and cash equivalents	213,797	-32,949	-1,062,172
Cash and cash equivalents at beginning of the year	751,953	784,902	1,847,074
Cash and cash equivalents at end of the year	965,750	751,953	784,902
Supplemental cash flow information:	'	'	'
Cash paid for interest	1,873	563	722
Cash paid for income taxes, net	9,385	16,813	14,096
Non-Cash Investing and Financing Activities:	'	'	'
Purchase of intellectual property under license obligations	$8,900	$42,692	'

The_Company_and_its_Significan

The Company and its Significant Accounting Policies	12 Months Ended
The Company and its Significant Accounting Policies	Feb. 01, 2014
The Company and its Significant Accounting Policies	'
	Note 1 — The Company and its Significant Accounting Policies:
	The Company
	Marvell Technology Group Ltd., a Bermuda company (the “Company”), is a leading global semiconductor provider of high-performance application-specific standard products. The Company’s core strength of expertise is the development of complex System-on-a-Chip devices leveraging its extensive technology portfolio of intellectual property in the areas of analog, mixed-signal, digital signal processing, and embedded 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 2014 and fiscal 2012 each had a 52-week period, and fiscal 2013 had a 53-week period.
	Certain amounts in the consolidated financial statements and notes to consolidated financial statements for prior years have been reclassified to conform to the fiscal 2014 presentation. Net operating results have not been affected by these reclassifications.
	Use of Estimates
	The preparation of consolidated financial statements in conformity with generally accepted accounting principles in the United States (“GAAP”) requires management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to performance-based compensation, revenue recognition, provisions for sales returns and allowances, inventory excess and obsolescence, investment fair values, goodwill and other intangible assets, restructuring, income taxes, litigation and other contingencies. In addition, the Company uses assumptions when employing the Monte Carlo simulation and Black-Scholes valuation models to calculate the fair value of share-based awards that are granted. Actual results could differ from these estimates, and such differences could affect the results of operations reported in future periods.
	Principles of Consolidation
	The 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.
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with a maturity of three months or less from the date of purchase to be cash equivalents. Cash and cash equivalents consist of cash on deposit with banks, time deposits, U.S. government and agency debt, municipal debt securities, corporate debt securities and money market funds.

	Investments
	The Company’s marketable investments are classified as available-for-sale and are reported at fair value. The Company determines any realized gains or losses on the sale of available-for-sale securities on a specific identification method, and such gains and losses are recorded as a component of interest and other income, net. Unrealized gains and losses of the available-for-sale securities are excluded from earnings and reported as a component of accumulated other comprehensive income. The Company assesses whether an other-than-temporary impairment loss on its available-for-sale securities has occurred due to declines in fair value or other market conditions. Declines in fair value that are considered other-than-temporary are recorded as an impairment of investments in interest and other income, net in the consolidated statements of operations.
	In general, investments with original maturities of greater than 90 days and remaining maturities of less than one year are classified as short-term investments. Investments with maturities beyond one year may also be classified as short-term based on their highly liquid nature and because such investments represent the investment of cash that is available for current operations.
	The Company also has equity investments in privately-held companies. If the Company has the ability to exercise significant influence over the investee, but not control, or if the investee is a partnership type investment, the Company accounts for the investments under the equity method. If the Company does not have the ability to exercise significant influence over the operations of the investee, the Company accounts for the investment under the cost method. Investments in privately-held companies are included in other non-current assets.
	Impairment of Investments
	If a debt security’s market value is below amortized cost and the Company either intends to sell the security or it is more likely than not that the Company will be required to sell the security before its anticipated recovery, the Company records an other-than-temporary impairment charge to interest and other income, net in the consolidated statements of operations.
	Investments in privately-held companies are subject to a periodic impairment review. Investments are considered impaired when the fair value is below the investment’s cost basis and the decline in value is judged to be other-than-temporary. This assessment is based on a qualitative and quantitative analysis, including, but not limited to, the investee’s revenue and earnings trends, available cash and liquidity, and the status of the investee’s products and the related market for such products. During fiscal 2014, the Company recorded a charge of $1.5 million to write down equity investments that were considered to be impaired.
	Derivative Financial Instruments
	The Company accounts for its derivative instruments as either assets or liabilities and carries them at fair value. For derivative instruments that hedge the exposure to variability in expected future cash flows and are designated as cash flow hedges, the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income in shareholders’ equity and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument is recognized in current earnings. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions. Derivatives that are not designated as hedges must be adjusted to fair value through earnings.

	Concentration of Credit Risk and Significant Customers
	Financial instruments that potentially subject the Company to a significant concentration of credit risk consist principally of cash equivalents, short-term investments and accounts receivable. Cash, cash equivalents and short-term investments balances are maintained with high quality financial institutions, the composition and maturities of which are regularly monitored by management. The Company believes that the concentration of credit risk in its trade receivables, which consists of a customer base located primarily in the Asia Pacific Region, is substantially mitigated by the Company’s credit evaluation process, relatively short collection terms and the high level of credit worthiness of its customers. The Company performs ongoing credit evaluations of its customers’ financial conditions and limits the amount of credit extended when deemed necessary based upon payment history and the customer’s current credit worthiness, but generally requires no collateral. The Company regularly reviews the allowance for bad debt and doubtful accounts by considering factors such as historical experience, credit quality, age of the accounts receivable balances and current economic conditions that may affect a customer’s ability to pay.
	The allowance for doubtful accounts at February 1, 2014 and February 2, 2013 was $1.3 million and $1.0 million, respectively. Please see “Note 1 – The Company and its Significant Accounting Policies – Revenue Recognition” for additional information on sales returns and allowances.
	Historically, a relatively small number of customers have accounted for a significant portion of the Company’s net revenue. The Company had two end customers who each represented greater than 10% of its total net revenue in fiscal 2014. Combined revenue from these two customers was 36% of total net revenue in fiscal 2014. The Company had three end customers who represented greater than 10% of its total net revenue in fiscal 2013. Combined revenue from these three customers was 44% of total net revenue in fiscal 2013. The Company had one end customer who represented greater than 10% of its total net revenue in fiscal 2012. Revenue from this customer was 19% of total net revenue in fiscal 2012.
	The Company’s accounts receivable was concentrated with one customer at February 1, 2014, representing 13% of gross accounts receivable, and with two customers at February 2, 2013, representing 19% and 15% of gross accounts receivable, respectively.
	No distributors accounted for more than 10% of the Company’s net revenue in fiscal 2014. In each of fiscal 2013 and 2012, one distributor accounted for more than 10% of the Company’s net revenue. The Company continuously monitors the creditworthiness of its distributors and believes these distributors’ sales to diverse end customers and to diverse geographies further serve to mitigate the Company’s exposure to credit risk.
	Inventories
	Inventory is stated at the lower of cost or market, cost being determined under the first-in, first-out method. The total carrying value of the Company’s inventory is reduced for any difference between cost and estimated market value of inventory that is determined to be excess, obsolete or unsellable inventory based upon assumptions about future demand and market conditions. If actual future demand for the Company’s products is less than currently forecasted, the Company may be required to write inventory down below the current carrying value. Once the carrying value of inventory is reduced, it is maintained until the product to which it relates to is sold or otherwise disposed of. Shipping and handling costs are classified as a component of cost of goods sold in the consolidated statements of operations.
	Property and Equipment, Net
	Property and equipment, net, are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which ranges from three to seven years for machinery and equipment, computer software, and furniture and fixtures. Buildings are depreciated over an estimated useful life of 30 years and building improvements are depreciated over estimated useful lives of 15 years. Leasehold improvements are depreciated using the shorter of the remaining lease term or the estimated useful life of the asset.
	Goodwill
	Goodwill is recorded when the consideration paid for a business acquisition exceeds the fair value of net tangible and intangible assets acquired. Goodwill is measured and tested for impairment annually or more frequently if the Company believes indicators of impairment exist. First, the Company assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the company concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, then a two-step quantitative impairment test is performed. The first step requires comparing the fair value of the reporting unit to its net book value, including goodwill. As the Company has only one reporting unit, the fair value of the reporting unit is determined by taking the market capitalization of the Company as determined through quoted market prices and adjusted for control premiums and other relevant factors. A potential impairment exists if the fair value of the reporting unit is lower than its net book value. The second step of the process is only performed if a potential impairment exists, and it involves determining the difference between the fair value of the reporting unit’s net assets other than goodwill and the fair value of the reporting unit. If the difference is less than the net book value of goodwill, impairment exists and is recorded. In the event that the Company determines that the value of goodwill has become impaired, the Company will record a charge for the amount of impairment during the fiscal quarter in which the determination is made. The Company has not been required to perform this second step of the process because the fair value of the reporting unit has sufficiently exceeded its net book value at every measurement date.
	Long-Lived Assets and Intangible Assets
	The Company assesses the impairment of long-lived assets and intangible assets whenever events or changes in circumstances indicate that the carrying amount of long-lived assets may not be recoverable. The Company estimates the future cash flows, undiscounted and without interest charges, expected to be generated by the assets from its use or eventual disposition. If the sum of the expected future cash flows is less than the carrying amount of those assets, the Company recognizes an impairment loss based on the excess of the carrying amount over the fair value of the assets. Please see “Note 7 – Goodwill and Acquired Intangible Assets” for further details regarding impairment of acquisition-related identified intangible assets.
	Acquisition-related identified intangible assets are amortized on a straight-line basis over their estimated economic lives. In-process research and development (“IPR&D”) is not amortized until the completion of the related development.
	Foreign Currency Transactions
	The functional currency of all of the Company’s non-U.S. operations is the U.S. dollar. Monetary accounts maintained in currencies other than the U.S. dollar are re-measured using the foreign exchange rate at the balance sheet date. Operational accounts and nonmonetary balance sheet accounts are measured and recorded at the rate in effect at the date of the transaction. The effects of foreign currency re-measurement are reported in current operations.
	Revenue Recognition
	The Company recognizes revenue when there is persuasive evidence of an arrangement, delivery has occurred, the fee is fixed or determinable, and collection is reasonably assured.

	Product revenue is generally recognized upon shipment of product to customers, net of accruals for estimated sales returns and rebates. However, some of the Company’s sales are made through distributors under agreements allowing for price protection, shipped from stock pricing adjustment rights, and limited rights of stock rotation on products unsold by the distributors. Although title passes to the distributor upon shipment terms and payment by the Company’s distributors is not contingent on resale of the product, product revenue on sales made through distributors with price protection, shipped from stock pricing adjustment rights and stock rotation rights are deferred until the distributors sell the product to end customers. Deferred revenue less the related cost of the inventories is reported as deferred income. The Company does not believe that there is any significant exposure related to impairment of deferred cost of sales, as its historical returns have been minimal and inventory turnover for its distributors generally ranges from 60 to 90 days. The Company’s sales to direct customers are made primarily pursuant to standard purchase orders for delivery of products.
	A portion of the Company’s net revenue is derived from sales through third-party logistics providers, who maintain warehouses in close proximity to the customer’s facilities. Revenue from sales through these third-party logistics providers is not recognized until the product is pulled from stock by the end customer.
	The provision for estimated sales returns on product sales is recorded in the same period the related revenues are recorded. These estimates are based on historical returns, analysis of credit memo data and other known factors. Actual returns could differ from these estimates. The Company accounts for rebates by recording reductions to revenue for rebates in the same period that the related revenue is recorded. The amount of these reductions is based upon the terms agreed to with the customer.
	Advertising Expense
	Advertising costs are expensed as incurred.
	Share-Based Compensation
	Share-based compensation is measured at the grant date, based on the fair value of the award, and is recognized as expense over the requisite service period. The Company amortizes share-based compensation expense for time-based and market-based awards under the straight-line attribution method over the vesting period, which is generally four years for annual grants to employees and five years for new hire grants. Performance-based awards are amortized using the accelerated method.
	The Company estimates the fair value of time-based stock option awards on the date of grant using the Black Scholes option-pricing model. The fair value of market-based stock option awards is estimated on the date of grant using a Monte Carlo simulation model. The value of the portion of the awards that is ultimately expected to vest is recognized as expense over the requisite service periods. The Black Scholes and Monte Carlo models incorporate various highly subjective assumptions including expected term of awards, expected future stock price volatility and expected forfeiture rates.
	In developing estimates used to calculate assumptions, the Company establishes the expected term for employee stock options, as well as expected forfeiture rates, based on the historical settlement experience and after giving consideration to vesting schedules. Assumptions for stock option exercises and pre-vesting terminations of stock options were stratified by employee groups with sufficiently distinct behavior patterns. Expected volatility was developed based on equally weighted combination of historical stock price volatility and implied volatility derived from traded options on the Company’s stock in the marketplace. The expected dividend yield is calculated by dividing annualized dividend payments by the closing stock price on the grant date of the option.

	Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from initial estimates. Share-based compensation expense is recorded net of estimated forfeitures such that expense is recorded only for those share-based awards that are expected to vest. Previously recognized expense is reversed for the portion of awards forfeited prior to vesting as and when forfeitures occurred.
	The fair value of each restricted stock unit is estimated based on the market price of the Company’s common shares on the date of grant less the expected dividend yield.
	Comprehensive Income
	Comprehensive income is comprised of net income and unrealized gains and losses, net of tax, on available-for-sale securities, auction rate securities and cash flow hedges. Accumulated other comprehensive income, as presented on the accompanying balance sheets, consists of net unrealized gains and losses on available-for-sale securities, auction rate securities, and cash flow hedges, net of tax.
	Accounting for Income Taxes
	The Company recognizes income taxes using an asset and liability approach. This approach requires the recognition of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in the Company’s consolidated financial statements or tax returns. The measurement of current and deferred taxes is based on provisions of the enacted tax law and the effects of future changes in tax laws or rates are not anticipated.
	Evaluating the need for an amount of a valuation allowance for deferred tax assets often requires judgment and analysis of all the positive and negative evidence available to determine whether all or some portion of the deferred tax assets will not be realized. A valuation allowance must be established for deferred tax assets when it is more likely than not that they will not be realized. Based on the available evidence and judgment, the Company has determined that it is more likely than not that U.S. research credits and certain acquired net operating losses will not be realized and therefore the Company has provided a full valuation allowance against these credits. If there is a change in the Company’s ability to realize its deferred tax assets, then the Company’s tax provision may decrease in the period in which it determines that realization is more likely than not.
	As a multinational corporation, the Company conducts its business in many countries and is subject to taxation in many jurisdictions. The taxation of the Company’s business is subject to the application of various and sometimes conflicting tax laws and regulations as well as multinational tax conventions. The Company’s effective tax rate is highly dependent upon the geographic distribution of its worldwide earnings or losses, the tax regulations and tax holidays in each geographic region, the availability of tax credits and carryforwards, and the effectiveness of its tax planning strategies. The application of tax laws and regulations is subject to legal and factual interpretation, judgment and uncertainty. Tax laws themselves are subject to change as a result of changes in fiscal policy, changes in legislation, and the evolution of regulations and court rulings. Consequently, taxing authorities may impose tax assessments or judgments against the Company that could materially impact its tax liability and/or its effective income tax rate.
	The Company is subject to income tax audits by the respective tax authorities in all of the jurisdictions in which the Company operates. The Company recognizes the effect of income tax positions only if these positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is more than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest and penalties related to unrecognized tax benefits in income tax expense. The calculation of the Company’s tax liabilities involves the inherent uncertainty associated with the application of GAAP and complex tax laws. The Company believes it has adequately provided for in its financial statements additional taxes that it estimates may be required to be paid as a result of such examinations. While the Company believes that it has adequately provided for all tax positions, amounts asserted by tax authorities could be greater or less than the Company’s accrued position. These tax liabilities, including the interest and penalties, are released pursuant to a settlement with tax authorities, completion of audit or expiration of various statutes of limitation. The material jurisdictions in which the Company may be subject to potential examination by tax authorities throughout the world include China, Israel, Singapore, Switzerland and the United States.
	Warranty
The Company’s products are generally subject to warranty, which provides for the estimated future costs of repair, replacement or customer accommodation upon shipment of the product. The Company’s products carry a standard 90 day warranty, with certain exceptions in which the warranty period can extend to more than one year based on contractual agreements. The warranty accrual is primarily estimated based on historical claims compared to historical revenues and assumes that the Company will have to replace products subject to a claim. From time to time, the Company becomes aware of specific warranty situations, and it records specific accruals to cover these exposures.
Accounting Pronouncements Recently Adopted
The Company adopted the new accounting standard regarding the testing of indefinite-lived intangible assets for impairment at the beginning of fiscal 2014. This amended guidance allows an entity first to assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test in accordance with the guidance on the impairment of intangible assets other than goodwill. The adoption of this guidance had no impact on the Company’s financial statements.
The Company adopted the new accounting standard regarding the reporting of amounts reclassified out of accumulated other comprehensive income. The amendments require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either in the financial statements or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. The Company elected to disclose the information in the Notes to Consolidated Financial Statements beginning in fiscal 2014.

Acquisitions_and_Divestitures

Acquisitions and Divestitures	12 Months Ended
Acquisitions and Divestitures	Feb. 01, 2014
Acquisitions and Divestitures	'
	Note 2 — Acquisitions and Divestitures:
	Acquisitions
	Fiscal 2014 and 2013. There were no significant acquisitions individually or in the aggregate during fiscal 2014 or 2013.
	Fiscal 2012. In December 2011, the Company acquired Xelerated AB (“Xelerated”), a company which specializes in network processing and programmable Ethernet switching solutions. The total purchase price was $75.2 million in cash, net of cash acquired. In addition to leveraging the existing acquired business and customer base, the objective of the acquisition was to expand the Company’s technology portfolio and enable more comprehensive integrated solutions for the networking market. The goodwill of $22.3 million was attributed to synergies specific to the Company in delivering these integrated solutions with its product portfolio, as well as the assembled workforce.

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


	Accounts receivable	$	2,407
	Inventory		6,481
	Prepaid and other current assets		111
	Property and equipment		441

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

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

	Net assets acquired	$	75,156

	Costs that were recognized separately from the acquisition were not significant and were expensed in fiscal 2012. In addition to the consideration for the acquisition, the agreement included retention bonuses totaling $4.3 million in cash over the two years following the close of the acquisition. These amounts were expensed as compensation expense over the course of the retention period.
	The acquired intangible assets from Xelerated were recognized as follows based upon their fair value as of the acquisition date (in thousands):


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

	Total	$	51,800

	The value of the purchased technology and the trade name of $25.8 million and $1.3 million, respectively, were determined based on the relief from royalty method, and the value of the customer intangible was determined using discounted cash flows.
	In April 2011, the Company acquired the physical-layer transceivers business of a company, which specializes in the design of networking devices. Under the acquisition method of accounting, the total purchase price was determined to be $16.3 million and was allocated to tangible assets for $1.1 million, intangible assets for $13.6 million and goodwill for $1.6 million.
	The completed acquisitions in fiscal 2012, individually and in the aggregate were not significant to the Company’s consolidated statements of operations. The goodwill acquired is not deductible for tax purposes.

	Divestiture
	Fiscal 2014. In connection with restructuring actions in fiscal 2014, the Company exited one of its businesses and sold certain assets to an unrelated third party. See “Note 8 – Restructuring” for further information. The transaction primarily included the sale of intellectual property and equipment with a carrying value of $0.1 million. The Company also wrote off $2.6 million of goodwill allocated to the business based on the relative fair values of the business and the Company’s remaining reporting unit. The buyer also hired the former employees of the business. As part of the transaction, the Company received a license to the intellectual property it sold. It also entered into a separate support services agreement with the buyer to cover an 18-month period. As a result of the sale of this business, the Company recorded a gain of $7.0 million, which is included in interest and other income, net, in the consolidated statement of operations.

Investments

Investments	12 Months Ended
Investments	Feb. 01, 2014
Investments	'
	Note 3 — Investments:
	The following tables summarize the Company’s investments (in thousands):


			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



			February 2, 2013
			Amortized			Gross			Gross				Estimated
			Cost			Unrealized			Unrealized				Fair Value
						Gains			Losses
	Short-term investments:
	Available-for-sale:
	Corporate debt securities		$	577,120		$	2,886		$	(382	)		$	579,624
	U.S. government and agency debt			318,226			258			(5	)			318,479
	Time deposits			188,000			—			—				188,000
	Asset backed securities			76,629			50			(64	)			76,615
	Foreign government and agency debt			4,320			—			(1	)			4,319

	Total short-term investments			1,164,295			3,194			(452	)			1,167,037
	Long-term investments:
	Available-for-sale:
	Auction rate securities			19,450			—			(2,681	)			16,769

	Total long-term investments			19,450			—			(2,681	)			16,769

	Total investments		$	1,183,745		$	3,194		$	(3,133	)		$	1,183,806


	As of February 1, 2014, the Company’s investment portfolio included auction rate securities with an aggregate par value of $19.2 million. Although these securities have continued to pay interest and show an improvement in the underlying collateralization, 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 the auction rate securities as of February 1, 2014 was $2.9 million less than the par value and was recorded in long-term investments. Based on the Company’s balance of approximately $2.0 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.
	The gross realized gains on sales of available-for-sale securities for fiscal 2014, 2013 and 2012 were $1.6 million, $3.6 million and $2.4 million, respectively. The gross realized losses on sales of available-for-sale securities for fiscal 2014, 2013 and 2012 were $0.3 million, $0.3 million and $1.0 million, respectively.
	The contractual maturities of available-for-sale securities are presented in the following table (in thousands):


			February 1, 2014						February 2, 2013
			Amortized			Estimated			Amortized				Estimated
			Cost			Fair Value			Cost				Fair Value
	Due in one year or less		$	309,543		$	309,861		$	519,006			$	519,537
	Due between one and five years			686,062			688,280			627,769				629,991
	Due over five years			24,666			21,793			36,970				34,278

			$	1,020,271		$	1,019,934		$	1,183,745			$	1,183,806

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):


		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	)



		February 2, 2013
		Less than 12 months						12 months or more							Total
		Fair			Unrealized			Fair				Unrealized			Fair		Unrealized
		Value			Loss			Value				Loss			Value		Loss
Corporate debt securities		$	141,915		$	(382	)	$	—			$	—		$	141,915	$	(382	)
Asset backed securities			43,882			(64	)		—				—			43,882		(64	)
U.S. government and agency debt			14,677			(5	)		—				—			14,677		(5	)
Foreign government and agency debt			4,319			(1	)		—				—			4,319		(1	)
Auction rate securities			—			—			16,769				(2,681	)		16,769		(2,681	)

Total securities		$	204,793		$	(452	)	$	16,769			$	(2,681	)	$	221,562	$	(3,133	)

Supplemental_Financial_Informa

Supplemental Financial Information	12 Months Ended
Supplemental Financial Information	Feb. 01, 2014
Supplemental Financial Information	'
	Note 4 — Supplemental Financial Information (in thousands):


			February 1,				February 2,
			2014				2013
	Cash and cash equivalents:
	Cash		$	694,789			$	583,527
	Cash equivalents:
	Time deposits			247,958				119,874
	U.S. government and agency debt			11,999				27,029
	Municipal debt securities			4,800				—
	Corporate debt securities			3,400				—
	Money market funds			2,804				21,523

	Cash and cash equivalents		$	965,750			$	751,953



			February 1,				February 2,
			2014				2013
	Inventories:
	Work-in-process		$	195,495			$	140,805
	Finished goods			152,366				109,615

	Inventories		$	347,861			$	250,420



			February 1,				February 2,
			2014				2013
	Property and equipment, net:
	Machinery and equipment		$	562,038			$	532,420
	Buildings			144,320				144,320
	Computer software			96,096				89,548
	Land			53,373				53,373
	Building improvements			49,645				49,516
	Leasehold improvements			49,060				46,205
	Furniture and fixtures			27,621				25,301
	Construction in progress			2,911				5,333

				985,064				946,016
	Less: Accumulated depreciation			(628,899	)			(573,045	)

	Property and equipment, net		$	356,165			$	372,971


	The Company recorded depreciation expense of $77.2 million, $70.7 million and $63.5 million for fiscal 2014, 2013 and 2012, respectively.


			February 1,				February 2,
			2014				2013
	Other non-current assets:
	Technology and other licenses		$	83,521			$	81,523
	Deferred tax assets			19,282				26,291
	Investments in privately-held companies			14,565				14,486
	Prepaid land use rights			13,744				14,056
	Deposits			12,433				10,451
	Other			16,821				18,078

	Other non-current assets		$	160,366			$	164,885

	Prepaid land use rights, which were previously included in property and equipment, net, have been reclassified to other non-current assets. The revision to the balance sheet at February 2, 2013 was not considered to be material and it had no impact on total assets, total liabilities, results of operations or cash flows. Amortization of technology and other licenses was $25.6 million, $20.3 million and $24.9 million in fiscal 2014, 2013 and 2012, respectively.


		February 1,				February 2,
		2014				2013
Accrued liabilities:
Accrued rebates		$	61,616			$	51,712
Accrued royalties			36,568				16,298
Technology license obligations			18,482				9,865
Accrued legal expense			14,589				14,754
Accrued share repurchases			—				22,152
Other			30,507				29,210

Accrued liabilities		$	161,762			$	143,991

Accrued share repurchases represent amounts due for the Company’s repurchases of its common shares made in the final 3 days of the fiscal year. The repurchased shares are retired immediately after the repurchases were completed.


		February 1,				February 2,
		2014				2013
Other non-current liabilities:
Technology license obligations		$	28,959			$	34,270
Long-term accrued employee compensation			4,370				6,205
Other			9,140				15,935

Other non-current liabilities		$	42,469			$	56,410


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


		Unrealized				Unrealized				Unrealized			Total
		Gain				Loss on				Gain
		(Loss) on				Auction				(Loss) on
		Marketable				Rate				Cash Flow
		Securities				Securities				Hedges
Balance at February 2, 2013		$	2,742			$	(2,681	)		$	1,087		$	1,148
Other comprehensive income (loss) before reclassifications			931				(190	)			3,466			4,207
Amounts reclassified from accumulated other comprehensive income			(1,139	)			—				(3,619	)		(4,758	)

Net current-period other comprehensive loss			(208	)			(190	)			(153	)		(551	)

Balance at February 1, 2014		$	2,534			$	(2,871	)		$	934		$	597



		Unrealized				Unrealized				Unrealized			Total
		Gain				Loss on				Gain
		(Loss) on				Auction				(Loss) on
		Marketable				Rate				Cash Flow
		Securities				Securities				Hedges
Balance at January 28, 2012		$	3,702			$	(1,285	)		$	(1,641	)	$	776
Other comprehensive income (loss) before reclassifications			2,141				(1,396	)			233			978
Amounts reclassified from accumulated other comprehensive income			(3,101	)			—				2,495			(606	)

Net current-period other comprehensive income (loss)			(960	)			(1,396	)			2,728			372

Balance at February 2, 2013		$	2,742			$	(2,681	)		$	1,087		$	1,148

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


		Year Ended
		February 1,
Affected Line Item in the		2014
Statement of Operations
Available-for-sale securities:
Interest and other income, net		$	1,139
Cash flow hedges:
Cost of goods sold			200
Research and development			3,129
Selling and marketing			266
General and administrative			24

Total		$	4,758


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


		Year Ended
		February 1,				February 2,				January 28,
		2014				2013				2012
Numerator:
Net income		$	315,320			$	306,585			$	615,091

Denominator:
Weighted average shares — basic			496,518				555,310				607,857
Effect of dilutive securities:
Share-based awards			7,895				7,813				15,411

Weighted average shares — diluted			504,413				563,123				623,268

Net income per share:
Basic		$	0.64			$	0.55			$	1.01
Diluted		$	0.63			$	0.54			$	0.99


		February 1,				February 2,				January 28,
		2014				2013				2012
Anti-dilutive potential shares:
Weighted average shares outstanding from stock options			39,593				28,124				21,014

Weighted average exercise price:		$	15.14			$	17.48			$	18.79

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. The anti-dilutive shares reported above also include shares from stock options that contain market conditions for vesting since the market value of the Company’s stock as of February 1, 2014, February 2, 2013 and January 28, 2012 was lower than the required market condition. There were 2.7 million shares in fiscal 2014 and 3.0 million anti-dilutive shares in each of fiscal 2013 and 2012, from stock options that contain market conditions. See “Note 12–Shareholders’ Equity” for additional details.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
Derivative Financial Instruments	Feb. 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. 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):


		Buy Contracts
		February 1,		February 2,
		2014		2013
	Israeli shekel	$	39,670	$	38,249
	Euro		5,718		—
	Swedish krona		3,709		—

		$	49,097	$	38,249

	Cash Flow Hedges. The Company designates and documents its foreign currency forward exchange contracts as cash flow hedges for certain operating expenses denominated in the Israeli shekel and Swedish krona. The Company evaluates and calculates the effectiveness of each hedge at least quarterly. The effective change is recorded in accumulated other comprehensive income and is subsequently reclassified to operating expense when the hedged expense is recognized. Ineffectiveness is recorded in interest and other income, net.
	Other Foreign Currency Forward Contracts. The Company enters into foreign currency forward exchange contracts to hedge certain assets and liabilities denominated in various foreign currencies that it does not designate as hedges for accounting purposes. The maturities of these contracts are generally less than 12 months. Gains or losses arising from the remeasurement of these contracts to fair value each period are recorded in interest and other income, net.
	The fair value of foreign currency exchange contracts was not significant as of any period presented.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Feb. 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 and liabilities include its marketable investments in time deposits, corporate debt securities, foreign government and agency debt, municipal debt securities and asset back 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, foreign currency forward contracts and the severance pay fund are classified within Level 2 as the valuation inputs are based on quoted prices and market observable data of similar instruments. The Company’s Level 3 assets include its investments in auction rate securities, which are classified within Level 3 because there are currently no active markets for the auction rate securities and consequently the Company is unable to obtain independent valuations from market sources. Therefore, the auction rate securities are valued using a discounted cash flow model. Some of the inputs to the cash flow model are unobservable in the market. The total amount of assets measured using Level 3 valuation methodologies represented 0.3% of total assets as of February 1, 2014.
	The tables below set forth, by level, the Company’s financial assets that were accounted for at fair value as of February 1, 2014 and February 2, 2013. 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 February 1,
												2014
	Items measured at fair value on a recurring basis:
	Assets
	Cash equivalents:
	Money market funds		$	2,804		$	—		$	—		$	2,804
	Time deposits			—			247,958			—			247,958
	Municipal debt securities			—			4,800			—			4,800
	U.S. government and agency debt			11,999			—			—			11,999
	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



			Level 1			Level 2			Level 3			Portion of
												Carrying
												Value
												Measured at
												Fair Value
												at February 2,
												2013
	Items measured at fair value on a recurring basis:
	Assets
	Cash equivalents:
	U.S. government and agency debt		$	27,029		$	—		$	—		$	27,029
	Money market funds			21,523			—			—			21,523
	Time deposits			—			119,874			—			119,874
	Short-term investments:
	U.S. government and agency debt			318,479			—			—			318,479
	Corporate debt securities			—			579,624			—			579,624
	Time deposits			—			188,000			—			188,000
Asset backed securities			—			76,615			—			76,615
Foreign government and agency debt			—			4,319			—			4,319
Prepaid expenses and other current assets:
Foreign currency forward contracts			—			1,144			—			1,144
Long-term investments:
Auction rate securities			—			—			16,769			16,769
Other non-current assets:
Severance pay fund			—			1,977			—			1,977

Total assets		$	367,031		$	971,553		$	16,769		$	1,355,353

The following table summarizes the change in fair values for Level 3 assets for the year ended February 1, 2014 and February 2, 2013 (in thousands):


		Level 3
Changes in fair value during the year (pre-tax):
Ending balance at January 28, 2012		$	23,215
Sales, redemption and settlement			(5,050	)
Unrealized loss included in accumulated other comprehensive income			(1,396	)

Ending balance at February 2, 2013			16,769
Sales, redemption and settlement			(300	)
Unrealized loss included in accumulated other comprehensive income			(190	)

Ending balance at February 1, 2014		$	16,279

Goodwill_and_Acquired_Intangib

Goodwill and Acquired Intangible Assets	12 Months Ended
Goodwill and Acquired Intangible Assets	Feb. 01, 2014
Goodwill and Acquired Intangible Assets	'
	Note 7 — Goodwill and Acquired Intangible Assets:
	Goodwill
	The Company evaluates goodwill for potential impairment annually in its fiscal fourth quarter or more frequently if the Company believes indicators of impairment exist. In fiscal 2014, the Company performed a qualitative assessment to determine whether it was more likely than not the fair value of the reporting unit was greater than its carrying value. Since the Company has only one reporting unit, it determines the fair value of the reporting unit by taking the market capitalization of the Company as determined through quoted market prices and adjusts for control premiums and other relevant factors, and compares the fair value to the Company’s net book value. In fiscal 2014, the Company experienced an upward trend in its stock price and as a result, the Company concluded there were no negative indicators that its goodwill was impaired. In fiscal 2013, the Company experienced a decline in its stock price combined with a decrease in its outstanding shares from its share repurchase activity, resulting in a lower market capitalization. As a result, the Company performed a quantitative assessment of goodwill using its market capitalization as described above to determine its fair value which it compared to the Company’s net book value. As a result, the Company concluded there was no impairment of its goodwill in fiscal 2013.
	The following table summarizes the activity related to the carrying value of goodwill (in thousands):


	Balance at January 28, 2012		$	2,031,991
	Additions due to business combinations			147

	Balance at February 2, 2013			2,032,138
	Additions due to business combinations			400
	Sale of a business			(2,593	)

	Balance at February 1, 2014		$	2,029,945

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


						February 1, 2014							February 2, 2013
			Range of			Gross		Accumulated			Net		Gross		Accumulated			Net
			Useful Lives			Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
						Amounts		and			Amounts		Amounts		and			Amounts
								Write-Offs							Write-Offs
	Purchased technology			4 - 7 years		$	49,240	$	(20,634	)	$	28,606	$	54,690	$	(18,552	)	$	36,138
	Core technology			5 - 8 years			2,350		(1,583	)		767		138,650		(123,298	)		15,352
	Trade names			5 years			1,300		(568	)		732		1,300		(308	)		992
	Customer intangibles			5 - 7 years			28,600		(13,056	)		15,544		89,400		(61,927	)		27,473
	IPR&D			*			3,386		—			3,386		9,700		—			9,700

	Total acquired intangible assets, net					$	84,876	$	(35,841	)	$	49,035	$	293,740	$	(204,085	)	$	89,655



	*	Upon completion of the projects, the related IPR&D assets will be amortized over its estimated useful life. If any of the projects are abandoned or the forecast of the project indicates that the fair value is less than the carrying amount, the Company will be required to write down the related IPR&D asset.
	Intangible assets, along with the related accumulated amortization, are removed from the table above at the end of the fiscal year they become fully amortized. The Company recorded charges of $8.1 million in fiscal 2014 for the impairment of an acquired intangible asset and $0.8 million in fiscal 2013 to write-off IPR&D related to an abandoned project, which are included in amortization and write-off of acquired intangible assets in the consolidated statement of operations. There was no impairment of acquired intangible assets in fiscal 2012.

	Based on the identified intangible assets recorded at February 1, 2014, the future amortization expense of identified intangibles excluding IPR&D for the next five fiscal years is as follows (in thousands):


	Fiscal Year
	2015		$	14,951
	2016			12,212
	2017			11,027
	2018			5,599
	2019			1,860
	Thereafter			—

			$	45,649

Restructuring

Restructuring	12 Months Ended
Restructuring	Feb. 01, 2014
Restructuring	'
	Note 8 — Restructuring:
	In fiscal 2014, the Company recorded a restructuring charge of $4.2 million related to the closure of two sites. This amount included $2.8 million of severance costs, and $1.4 million for other exit-related costs in connection with vacating two facilities and the write-off of equipment. All activities related to the closure of the two sites were substantially completed by the end fiscal 2014.
	In fiscal 2013, the Company recorded a restructuring charge when the sublease of one of its previously vacated facilities was terminated.
	In fiscal 2012, the Company decided to vacate a leased facility it assumed in connection with the Xelerated acquisition immediately after the close of the transaction. As a result, the Company recorded an insignificant restructuring charge for the lease obligation. In fiscal 2012, the Company also completed the sale of its building that was previously classified as held for sale in fiscal 2011. The building was sold to an unrelated third party for $6.8 million, equal to its revised carrying value.
	The Company also continued to make payments and incurred restructuring charges for ongoing operating expenses related to previously vacated facilities during fiscal 2014, 2013 and 2012.
	The following table presents details of restructuring charges by functional line item (in thousands):


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Research and development	$	2,886		$	47		$	728
	Selling and marketing		795			(3	)		8
	General and administrative		1,051			1,213			1,120

		$	4,732		$	1,257		$	1,856


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


		Severance			Facilities			Other			Total
		and Related			and Related			Exit-Related
		Costs			Costs			Costs
	Balance at January 28, 2012	$	—		$	2,917		$	—		$	2,917
	Restructuring charges		—			553			—			553
	Net cash payments		—			(1,329	)		—			(1,329	)
	Non-cash adjustments		—			10			—			10
	Adjustments to previous estimates		—			704			—			704

	Balance at February 2, 2013		—		$	2,855		$	—			2,855
	Restructuring charges		2,786			1,672			213			4,671
	Net cash payments		(2,735	)		(2,144	)		(194	)		(5,073	)

	Balance at February 1, 2014	$	51		$	2,383		$	19		$	2,453

	The severance costs included in the table above are expected to be paid in the first quarter of fiscal 2015. The facility and related costs recorded in fiscal 2014 primarily represent payments under lease obligations of vacated facilities associated with the closure of two sites, which are expected to be paid through fiscal 2015.
	The balance at February 1, 2014 for facility and related costs also includes remaining payments under lease obligations related to vacated facilities under previous restructure actions which are expected to be paid through fiscal 2018.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Feb. 01, 2014
Income Taxes	'
	Note 9 — Income Taxes:
	The U.S. and non-U.S. components of income before income taxes consist of the following (in thousands):


			Year Ended
			February 1,				February 2,				January 28,
			2014				2013				2012
	U.S. operations		$	31,339			$	34,900			$	28,039
	Non-U.S. operations			274,918				275,290				591,020

			$	306,257			$	310,190			$	619,059


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


			Year Ended
			February 1,				February 2,				January 28,
			2014				2013				2012
	Current income tax provision (benefit):
	Federal		$	5,774			$	4,461			$	8,183
	State			73				407				99
	Foreign			(18,829	)			(8,289	)			(1,069	)

	Total current income tax provision (benefit)			(12,982	)			(3,421	)			7,213
	Deferred income tax provision (benefit):
	Federal			317				6,306				(1,361	)
	State			32				90				1,078
	Foreign			3,570				630				(2,962	)

	Total deferred income tax provision (benefit)			3,919				7,026				(3,245	)

	Total provision (benefit) for income taxes		$	(9,063	)		$	3,605			$	3,968

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


			February 1,				February 2,
			2014				2013
	Deferred tax assets:
	Federal and California research and other tax credits		$	335,894			$	299,475
	Reserves and accruals			25,833				27,830
	Share-based compensation			4,067				3,523
	Net operating losses			18,470				20,553

	Gross deferred tax assets			384,264				351,381
	Valuation allowance			(335,890	)			(299,449	)

	Total deferred tax assets			48,374				51,932
	Total deferred tax liabilities			(17,586	)			(17,225	)

	Net deferred tax assets		$	30,788			$	34,707

	The non-current portion of the deferred tax assets as of February 1, 2014 and February 2, 2013 was $19.3 million and $26.3 million, respectively, and is included in other non-current assets. During fiscal 2014, deferred tax assets, net of a corresponding valuation allowance decreased $3.9 million from the end of fiscal 2013, mostly due to an increase in the Singapore deferred tax liability since the Singapore government has not yet granted an extension of the tax incentive arrangement in Singapore which expires in June 2014.
	As of February 1, 2014, the Company had net operating loss carryforwards available to offset future taxable income of approximately $68.9 million, $1.9 million and $7.3 million for foreign, U.S. federal and state of California purposes, respectively. The federal carryforwards will expire in various fiscal years between 2021 and 2027, and the California carryforwards will expire at various fiscal years between 2016 and 2033, if not utilized before these years. The losses in non-U.S. companies can be carried forward indefinitely. For U.S. federal income tax return purposes, the Company had research tax credit carryforwards of approximately $211.8 million that expire through fiscal 2034. As of February 1, 2014, the Company had unused California research and tax credit carryforwards of approximately $211.4 million, which can be carryforward indefinitely. Included in the U.S. federal and California carryforward amounts are $53.9 million and $52.3 million, respectively, that are attributable to excess tax benefits from stock options. Upon realization, the benefit associated with these credits will increase additional paid-in capital. The Company also has research and investment tax credit carryforwards of approximately $18.8 million in other U.S. states that expire through fiscal 2029 due to the statute of limitation.
	At the end of fiscal 2014, the Company has provided a full valuation allowance against its federal and various state research credits which it earns in excess of its current year tax liabilities, as well as a portion against its net operating loss carryforwards. Based on the available objective positive and negative evidence, the Company has determined that it is more likely than not that these research credits and acquired net operating losses will not be realized. Therefore, the Company has recorded a valuation allowance of $335.9 million, an increase of $36.4 million from fiscal 2013.
	Reconciliation of the statutory federal income tax to the Company’s effective tax:


			Year Ended
			February 1,				February 2,				January 28,
			2014				2013				2012
	Provision at U.S. notional statutory rate			35	%			35	%			35	%
Non-deductible share-based compensation			19.4				15.4				6.9
Difference in U.S. and non-U.S. tax rates			(55.8	)			(48.8	)			(40.7	)
Benefits from utilization of general business credits			(14.1	)			(13.8	)			(6.8	)
Change in valuation allowance			11.9				12.9				5.6
Other			0.6				0.5				0.6

Effective tax rate			(3.0	)%			1.2	%			0.6	%

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


		Year Ended
		February 1,				February 2,				January 28,
		2014				2013				2012
Unrecognized tax benefits at beginning of the year		$	79,031			$	96,294			$	102,612
Increases related to prior year tax positions			499				1,106				987
Decreases related to prior year tax positions			(111	)			—				(307	)
Increases related to current year tax positions			2,666				1,139				1,229
Settlements			(7,423	)			(3,956	)			(243	)
Lapse in the statute of limitations			(13,969	)			(15,543	)			(9,529	)
Foreign exchange (gain) loss			(9,011	)			(9	)			1,545

Gross amounts of unrecognized tax benefits at end of the year		$	51,682			$	79,031			$	96,294

Included in the balances as of February 1, 2014 is $43.2 million of unrecognized tax benefit that would affect the effective income tax rate if recognized.
The amounts in the table above do not include the related interest and penalties. The amount of interest and penalties accrued as of February 1, 2014 was approximately $29.6 million, as of February 2, 2013 was approximately $33.8 million and as of January 28, 2012 was approximately $35.3 million. The consolidated statements of operations for fiscal 2014, 2013 and 2012 included $6.2 million, $5.8 million and $5.9 million, respectively, of interest and penalties related to the unrecognized tax benefits.

The Company is subject to income tax audits by the respective tax authorities in all of the jurisdictions in which it operates. The examination of tax liabilities in each of these jurisdictions requires the interpretation and application of complex and sometimes uncertain tax laws and regulations. As of February 1, 2014, the material jurisdictions that are subject to examination include China, Israel, Singapore, Switzerland and the United States for the Company’s fiscal years 2004 through 2014. As of February 1, 2014, one of the Company’s non-U.S. entities is under examination for fiscal years encompassing 2007 through 2010.
During fiscal 2014, the Company will continue to review its tax positions and provide for or reverse unrecognized tax benefits as issues arise. During the next 12 months, it is reasonably possible that the amount of unrecognized tax benefits could 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 $20 million from the lapse of the statutes of limitation in various jurisdictions during the next 12 months.
The Singapore Economic Development Board (“EDB”) initially granted a 10-year Pioneer Status in July 1999 to the Company’s subsidiary in Singapore if the Company met several requirements as to investments, headcount and activities. In October 2004, the Company’s subsidiary in Singapore was granted a second incentive known as the Development and Expansion Incentive (“DEI”), which was retroactively effective to July 2004 and is renewable every 5 years. The DEI was to benefit the non-Pioneer income. In June 2006, the EDB agreed to extend the Pioneer status for 15 years to June 2014. In 2009, the EDB renewed the DEI to June 2014. In fiscal 2014, 2013 and 2012 tax savings associated with these tax holidays were approximately $3.7 million, $13.6 million and $3.1 million, respectively, which if paid would impact the Company’s earnings per share by $0.01 per share in fiscal 2014, $0.02 per share in fiscal 2013 and $0.01 per share in fiscal 2012. The maximum period for the Pioneer Incentive is 15 years; therefore, the Company’s subsidiary is no longer eligible to apply for this incentive. The Company is currently in discussion with the EDB to extend the DEI through June 2019. DEI can be enjoyed up to 40 years. Renewals and extensions of such tax incentives are at the discretion of the Singapore government. An extension of this tax incentive arrangement has not yet been granted by the Singapore government beyond its expiration in June 2014. Absent the tax incentives, the corporate income tax rate in Singapore would otherwise be 17%.
Under the Israeli Encouragement law of “approved or benefited enterprise,” two branches of Marvell Israel (M.I.S.L) Ltd. (“MISL”), the GTL branch and the cellular branch (formerly Marvell DSPC), are entitled to approved and benefited tax programs that include reduced tax rates and exemption of certain income. The first program was approved for MISL in fiscal 1996 and the most recent was started in fiscal 2013. The cellular branch has five approved programs and three benefited programs with the first approved in fiscal 1991 and the most recent benefited enterprise started in fiscal 2011. The benefit period is generally 10 to 15 years and begins in the first year in which the Company’s Israeli divisions earn taxable income from the approved or benefited enterprises, provided the maximum period has not elapsed. Income from the approved or benefited enterprises is subject to reduced tax rates ranging between 0% and 10% or tax exemptions for fiscal years 2008 through fiscal 2027. A new amendment to the Encouragement law, which was approved by the Israeli government in December 2011, came into effect January 1, 2012. For fiscal 2014, 2013 and 2012, the benefit associated with these approved or benefited enterprise programs was $2.2 million and $13.8 million and $13.6 million, respectively, which provided earnings per share of $0.01 per share in fiscal 2014 and $0.02 per share in each of fiscal 2013 and 2012.
During fiscal 2007, each of the Swiss Federal Department of Economy and the Vaud Cantonal Tax Administration granted the Company’s subsidiary in Switzerland a 10 year tax holiday on revenues from research and design wafer supply trading activities commencing with its fiscal 2007. The fiscal 2014, 2013 and 2012 tax savings associated with this tax holiday is approximately $5.1 million, $4.6 million and $4.7 million, respectively, which provided earnings per share of $0.01 per share in 2014 and less than $0.01 per share in each of fiscal 2013 and 2012.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Feb. 01, 2014
Commitments and Contingencies	'
	Note 10 — Commitments and Contingencies:
	Warranty Obligations
	The Company’s products carry a standard 90 day warranty with certain exceptions in which the warranty period can extend to more than one year based on contractual agreements. The Company’s warranty expense has not been significant in the periods presented.
	Lease Commitments
	The Company leases some of its facilities, equipment and computer aided design software under non-cancelable operating leases. Rent expense, net of sublease income for fiscal 2014, 2013 and 2012 was approximately $25.8 million, $23.7 million and $20.5 million, respectively. The Company also purchases certain intellectual property under technology license obligations. Future minimum lease payments, net of estimated sublease, and payments under technology license obligations as of February 1, 2014, are presented in the following tables (in thousands):


	Fiscal Year:	Minimum			Sublease			Net
		Lease			Income			Operating
		Payments						Leases
	2015	$	75,678		$	(72	)	$	75,606
	2016		61,774			(75	)		61,699
	2017		32,751			(46	)		32,705
	2018		6,455			—			6,455
	2019		1,150			—			1,150
	Thereafter		1,785			—			1,785

	Total future minimum lease payments	$	179,593		$	(193	)	$	179,400



	Fiscal Year:	Technology
		License
		Obligations
	2015	$	14,913
	2016		13,145
	2017		7,869
	2018		9,180
	2019		—
	Thereafter		—

	Total future minimum lease payments	$	45,107

	Less: amount representing interest		(2,027	)

	Present value of future minimum payments		43,080
	Less: current portion		(14,121	)

	Non-current portion	$	28,959

	Technology license obligations include the liabilities under the subscription agreements for technology licenses between the Company and various vendors.

	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 February 1, 2014, these foundries had incurred approximately $270.9 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 customer’s attorneys’ fees and costs. The Company’s indemnification obligations generally do not expire after termination or expiration of the agreement containing the indemnification obligation. Generally, there are limits on and exceptions to the Company’s potential liability for indemnification. Although historically the Company has not made significant payments under these indemnification obligations, the Company cannot estimate the amount of potential future payments, if any, that it might be required to make as a result of these agreements. The maximum potential amount of any future payments that the Company could be required to make under these indemnification obligations could be significant.
	Contingencies
	The Company and certain of its subsidiaries are currently parties to various legal proceedings, including those noted in this section. The legal proceedings and claims described below could result in substantial costs and could divert the attention and resources of the Company’s management. 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 February 1, 2014, the Company has a $15.2 million accrued liability related to certain legal proceedings described below in this section. 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. Due to the finding of willfulness during post-trial proceedings, the judge could enhance the damages by an amount up to triple the damages awarded by the jury at trial. In addition, CMU has disclosed in its post-trial motions that it is seeking 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 forthcoming 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^rd), 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. The District Court has yet to rule on CMU’s injunction motion. The Company expects the District Court to issue its final judgment at any time.
	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 intend to vigorously challenge the District Court’s judgment via an appeal to 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 (including finalization of the post-trial motions at the District Court) could significantly change the assessment of damages.
	Jasmine Networks Litigation. On September 12, 2001, Jasmine Networks, Inc. (“Jasmine”) filed a lawsuit in the Santa Clara County Superior Court alleging claims against MSI and three of its officers for allegedly improperly obtaining and using information and technologies during the course of the negotiations with its personnel regarding the potential acquisition of certain Jasmine assets by MSI.
	The case proceeded to trial on September 20, 2010. On November 24, 2010, a Santa Clara County jury returned a verdict in favor of MSI on all claims. On January 7, 2011, the court entered judgment in MSI’s favor. Pursuant to California Civil Procedure provisions, Jasmine filed motions for a new trial and for a judgment notwithstanding the verdict. These motions were heard by the court on February 25, 2011 and denied in written orders. Jasmine has appealed and MSI is contesting the appeal vigorously. Oral arguments on the appeal were heard on June 18, 2013. On July 17, 2013, the Court of Appeals unanimously affirmed judgment in favor of MSI. The deadline for Jasmine to appeal to the California Supreme Court passed on August 26, 2013 without Jasmine taking any further action.
	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. Trial is scheduled for January 5, 2015.
	Lake Cherokee Patent I 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 alleges infringement of U.S. Patent Nos. 5,844,738 and 5,978,162 (collectively, the “Lake Cherokee patents”). The Lake Cherokee patents purportedly relate to read-channel integrated circuit devices and to certain HDD products incorporating such devices. A claim construction ruling was issued on August 6, 2012. Lake Cherokee’s damages claim, which excluded non-U.S. related sales as a result of the District Court’s summary judgment ruling, 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 and unanimously found that MSI did not infringe the Lake Cherokee patents. On the same day, the Court entered judgment in MSI’s favor. Lake Cherokee has since moved for a new trial and the briefing was concluded on October 28, 2013. The District Court has not ruled on Lake Cherokee’s post-trial motion.
	Lake Cherokee II Patent Litigation. On September 5, 2013, Lake Cherokee filed suit in the U.S. District Court for the Eastern District of Texas against Marvell Asia Pte., Ltd. (“MAPL”) and several of the Company’s storage customers, alleging infringement of U.S. Patent Nos. 5,844,738 and 5,978,162 (the same Lake Cherokee patents found not infringed in Lake Cherokee I).
	Lake Cherokee III Patent Litigation. On September 25, 2013, Lake Cherokee filed 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. MSI answered the complaint on November 29, 2013. A claim construction hearing is set for August 5, 2014 and trial is currently scheduled to start on April 13, 2015.
	APT Patent Litigations. On January 18, 2011, Advanced Processor Technologies, LLC (“APT”), a subsidiary of Acacia Research Corp., filed a complaint in the U.S. District Court for the Eastern District of Texas. The complaint names MSI and eight other defendants and alleged infringement of U.S. Patent Nos. 6,047,354 and 5,796,978. In April 2013, the parties reached an agreement to dismiss all claims and counterclaims. On June 25, 2013, MSI was dismissed from the cases. The resolution did not have a significant impact on the Company’s financial statements.
	MOSAID Litigation. On March 16, 2011, MOSAID Technologies Inc. filed suit in the U.S. District Court for the Eastern District of Texas against MSI and 16 other companies. The complaint alleges that defendants’ products, which operate in compliance with various IEEE 802.11standards, infringe the six asserted patents (U.S. Patent Nos. 5,131,006; 5,151,920; 5,422,887; 5,706,428; 6,563,768; 6,992,972). MSI filed its answer and counterclaims on June 9, 2011. On March 28, 2012, MSI and other defendants filed a motion to transfer, which was denied. A claim construction hearing was held on April 16, 2013 and a claim construction ruling was issued by the magistrate judge on April 22, 2013. On June 3, 2013, the District Court issued an order denying plaintiff’s motion for reconsideration and adopted the magistrate’s claim construction ruling. On September 20, 2013, MSI and MOSAID entered a license agreement that settled the pending disputes between the parties, and on October 11, 2013, MSI was dismissed from the case. An agreed motion to dismiss MSI from the lawsuit was filed on October 8, 2013. 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. On August 20, 2013, Azure filed its opening appeal brief. On October 3, 2013, MSI and the other defendants filed a respondents’ brief.
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.
HSM/TPL Litigation. On September 1, 2011, HSM Portfolio, LLC and Technology Properties Limited, LLC filed a complaint against the Company and MSL in the U.S. District Court for the District of Delaware. The complaint also named numerous other defendants. The complaint asserted U.S. Patent No. 5,030,853, relating to high speed logic and memory circuitry, against various products. The complaint sought unspecified damages. On January 9, 2012, HSM/TPL filed an amended complaint adding MSI to the case. On February 15, 2012, the Company and MSL were dismissed from the case. On June 10, 2013, MSI and HSM/TPL reached a settlement and on June 25, 2013, MSI was dismissed from the case. The settlement did not have a significant impact on the Company’s financial statements.
France Telecom Litigation. On June 26, 2012, France Telecom S.A. (“France Telecom”) 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. Trial is scheduled for May 12, 2014.
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. The complaint asserts U.S. Patent Nos. 6,920,316, 5,825,640, 5,943,274, 5,467,455 and 7,927,927 against certain of the Company’s integrated circuits and/or chipsets. The complaint seeks unspecified damages and a permanent injunction. Freescale filed an amended complaint on January 14, 2013 and withdrew its assertion of U.S. Patent No. 5,825,640; MSI filed its answer to the amended complaint on February 4, 2013. This case has been consolidated for pre-trial purposes with nine other pending cases. A claim construction hearing was held on October 24, 2013 and was completed on December 13, 2013. No trial date has been set.

On January 4, 2013, three of the Company’s subsidiaries, MSI, Marvell International Ltd. (“MIL”) and Marvell World Trade Ltd., filed a complaint against Freescale in the U.S. District Court for the Western District of Texas, and filed an amended complaint on January 14, 2013. The amended complaint alleges that Freescale infringes U.S. Patents Nos. 6,903,448 and 7,379,718. A claim construction hearing was held on December 13, 2013. No trial date has been set.
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, asserting 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 November 19, 2013, PSS filed an amended complaint. MSI answered the first amended complaint on November 22, 2013. A claim construction hearing is scheduled to occur on or before August 11, 2014 and trial is scheduled to start on March 3, 2015. On March 3, 2014, the District Court dismissed MSI without prejudice. On March 4, 2014, PSS filed a new complaint against MSI, asserting infringement of the ‘349 patent but not the ‘208 patent.
Vantage Point Technology Patent Litigation. On November 21, 2013, Vantage Point Technology, Inc. filed suit against a third party defendant for patent infringement relating to processor technology. On February 3, 2014, Vantage filed an amended complaint against the third party and added MSI as an additional defendant. The complaint seeks unspecified damages and no trial date has been set.
Surety Bond
The Company plans to appeal the final judgment issued by the District Court in the CMU litigation, regardless of the dollar amount of the final judgment. The parties are currently engaged in discussions before a Special Master concerning the bonding of the judgment pending appeal. During October 2013, the Company entered into indemnity agreements with a consortium of insurers that would potentially provide financial assurance that each of the insurers will be indemnified by the Company should a loss occur under a surety bond. As of February 1, 2014 and as of the date of this filing, no final judgment has been issued and no surety bond has been issued. Therefore, these indemnity agreements have had no impact to the Company’s Consolidated Balance Sheets as of February 1, 2014. The Company expects that under a surety bond, the surety companies would agree to guarantee to the District Court the Company’s payment of a specific amount, to be determined. However, the terms of any surety bond arrangements have not been finalized and the Company cannot be certain that a surety bond will be available to the Company in sufficient amount to cover the full amount of a final judgment or on commercially reasonable terms. If the Company cannot obtain a surety bond in sufficient amount or on commercially reasonable terms, or if the District Court in the CMU litigation does not approve alternative arrangements to stay execution of the judgment pending the Company’s appeal, it’s business could be harmed. For example, if, under a surety bond, the Company must post its cash, cash equivalents and short term investments as collateral, it may be restricted from using such assets in the operation of its business and such assets would be classified as restricted cash in future filings.
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.

Benefit_Plans

Benefit Plans:	12 Months Ended
Benefit Plans:	Feb. 01, 2014
Benefit Plans:	'
	Note 11 — Benefit Plans:
	The Company sponsors a 401(k) savings and investment plan that allows eligible U.S. employees to participate by making pre-tax contributions to the 401(k) plan ranging from 1% to 50% of eligible earnings subject to a required annual limit. The Company matches 100% of the employee contribution up to $500 per eligible employee on a quarterly basis. The participant must be employed by the Company on the last day of the calendar quarter to qualify for the match. At the end of the calendar year, the eligible employees receive a true-up match equal to the accumulated employee contribution for the calendar year up to $2,000. The Company made matching contributions to employees of $5.0 million, $5.0 million and $4.8 million during fiscal 2014, 2013 and 2012, respectively. As of February 1, 2014, the 401(k) plan offers a variety of investment alternatives, representing different asset classes. Employees may not invest in the Company’s common shares through the 401(k) plan.
	The Company also has voluntary defined contribution plans in various non-U.S. locations. The Company made contributions on behalf of employees totaling $20.6 million, $17.2 million and $16.2 million during fiscal 2014, 2013 and 2012, respectively. The Company also maintains a limited number of defined benefit plans for certain non-U.S. locations. Total costs under these plans were not significant.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Feb. 01, 2014
Shareholders' Equity	'
	Note 12 — Shareholders’ Equity:
	Common and Preferred Stock
	As of February 1, 2014, the Company is authorized to issue 992.0 million shares of $0.002 par value common stock and 8.0 million shares of $0.002 par value preferred stock. As of February 1, 2014 and February 2, 2013, no shares of preferred stock were outstanding.
	1995 Stock Option Plan
	In April 1995, the Company adopted the 1995 Stock Option Plan (the “Option Plan”). The Option Plan, as amended from time to time, had 383.4 million common shares reserved for issuance thereunder as of February 1, 2014. Options granted under the Option Plan generally have a term of 10 years and generally must be issued at prices equal to the fair market value of the stock on the date of grant. Incentive stock options granted to shareholders who own greater than 10% of the outstanding stock at the time of the grant may not have a term exceeding five years and these options must be issued at prices of at least 110% of the fair market value of the stock on the date of grant.
	In addition, the Company can also grant stock awards, which may be subject to vesting. Further, the Company can grant restricted stock unit awards. Restricted stock unit awards are denominated in shares of stock, but may be settled in cash or shares upon vesting, as determined by the Company at the time of grant.

	Equity awards to new hires under the Option Plan generally vest 20% one year after the vesting commencement date and the remaining shares vest one-sixtieth per month over the remaining 48 months. Other equity awards generally vest annually in four equal installments.
	As of February 1, 2014, approximately 95.2 million shares remained available for future issuance under the Option Plan.
	1997 Directors’ Stock Option Plan
	In August 1997, the Company adopted the 1997 Directors’ Stock Option Plan (the “1997 Directors’ Plan”). Under the 1997 Directors’ Plan, an outside director was granted an option to purchase 30,000 common shares upon appointment to the Company’s Board of Directors. These options vested 20% one year after the vesting commencement date and remaining shares vest one-sixtieth per month over the remaining 48 months. An outside director was also granted an option to purchase 6,000 common shares on the date of each annual meeting of the shareholders. These options vested one-twelfth per month over 12 months after the fourth anniversary of the vesting commencement date. Options granted under the 1997 Directors’ Plan could be exercised prior to vesting and had a term of 10 years. The 1997 Directors’ Plan was terminated in October 2007. There are two outstanding grants remaining under the 1997 Directors’ Plan.
	2007 Directors’ Stock Incentive Plan
	In October 2007, the Company adopted the 2007 Directors’ Stock Incentive Plan, for which shareholders approved a total of 750,000 common shares that could be issued under the plan to all eligible outside directors. Each outside director was granted an option to purchase 50,000 common shares upon his or her initial appointment to the Company’s Board of Directors. These options, which have a term of 10 years, vested one-third of the total shares on the one-year anniversary of the date of grant and one-third of the total shares on each one-year anniversary thereafter. From time to time, the Board has the authority to approve the amendment and restatement of the plan to revise the size of automatic annual awards granted under the plan.
	In fiscal 2012, each outside director who had been serving on the Company’s Board of Directors for the prior six months and was re-elected by the shareholders at the annual general meeting was granted an option to purchase 9,000 common shares. These options, which have a term of 10 years, vested 100% on the earlier of the date of the next annual general meeting of shareholders or the one-year anniversary of the date of grant. In addition, each outside director was also granted a restricted stock unit (“RSU”) award for a number of shares with an aggregate fair market value equal to $70,000 immediately following the annual general meeting of shareholders. These RSU awards vested 100% on the earlier of the date of the next annual general meeting of shareholders or the one-year anniversary of the date of grant.
	In fiscal 2013 and 2014, each outside director who was appointed at the annual general meeting of shareholders was granted an option to purchase a number of common shares with an aggregate grant date fair value equal to $110,000 immediately following the annual general meeting of shareholders. In addition, each outside director who was elected or appointed at the annual general meeting of shareholders was granted an RSU award for a number of shares with an aggregate fair market value equal to $110,000 immediately following each annual general meeting. The option awards, which have a term of 10 years, and the RSU awards vest 100% on the earlier of the date of the next annual general meeting of shareholders or the one-year anniversary of the date of grant. An outside director elected or appointed after an annual general meeting of shareholders would receive a pro rata stock option award and RSU award based on the number of quarters completed since the previous annual general meeting of shareholders. In no event would any outside director be awarded in any calendar year an annual option award or annual RSU award under the 2007 Director Plan for more than 25,000 shares and 10,000 shares, respectively.

	Beginning in fiscal 2015, each outside director who is first elected or appointed at the annual general meeting of shareholders will be granted an RSU award for a number of shares with an aggregate fair market value equal to $220,000 immediately following each annual general meeting of shareholders. The RSU award vests as to 100% of the shares on the earlier of the date of the next annual general meeting of shareholders or the one-year anniversary of the date of grant. An outside director who is elected or appointed after an annual general meeting of shareholders will receive a pro rata RSU award based on the number of quarters completed since the prior annual general meeting of shareholders. In no event shall any outside director be awarded in any calendar year an annual RSU award under the 2007 Director Plan for more than 20,000 shares, respectively.
	As of February 1, 2014, approximately 204,924 shares remained available for future issuance under the 2007 Directors’ Plan.
	2000 Employee Stock Purchase Plan
	Under the 2000 Employee Stock Purchase Plan, as amended and restated on October 31, 2011 (the “ESPP”), participants purchase the Company’s stock using payroll deductions, which may not exceed 15% of their total cash compensation. Pursuant to the terms of the current ESPP, the “look-back” period for the stock purchase price is 24 months. Offering and purchase periods begin on December 8 and June 8 of each year. Participants enrolled in a 24-month offering period will continue in that offering period until the earlier of the end of the offering period or the reset of the offering period. A reset occurs if the fair market value of the Company’s common shares on any purchase date is less than it was on the first day of the offering period. Participants in a 24-month offering period will be granted the right to purchase common shares at a price per share that is 85% of the lesser of the fair market value of the shares at (i) the participant’s entry date into the two-year offering period or (ii) the end of each six-month purchase period within the offering period.
	During fiscal 2014, a total of 9.7 million shares were issued under the ESPP at a weighted average price of $7.39. During fiscal 2013, a total of 7.6 million shares were issued under the ESPP at a weighted average price of $8.77. During fiscal 2012, a total of 4.9 million shares were issued under the ESPP at a weighted average price of $12.48.
	As of February 1, 2014, approximately 24.5 million shares remained available for future issuance under the ESPP.

	Option Plan and Stock Award Activity
	The following table summarizes the activity under all of the option plans and other stock based arrangements (in thousands, except for per share amounts):


			Time-Based Options							Market-Based Options					Total
			Options				Weighted			Options			Weighted		Options			Weighted
			Outstanding				Average Exercise			Outstanding			Average Exercise		Outstanding			Average Exercise
							Price						Price					Price
	Balance at January 29, 2011			56,325			$	11.96			—			—		56,325		$	11.96
	Granted			3,477			$	15.31			3,149		$	15.43		6,626		$	15.37
	Exercised			(5,681	)		$	7.95			—			—		(5,681	)	$	7.95
	Canceled/Forfeited			(1,654	)		$	14.57			(25	)	$	15.43		(1,679	)	$	14.58
	Expired			—				—			—			—		—			—

	Balance at January 28, 2012			52,467			$	12.53			3,124		$	15.43		55,591		$	12.7
	Granted			7,041			$	14.59			—			—		7,041		$	14.59
	Exercised			(5,977	)		$	6.44			—			—		(5,977	)	$	6.44
	Canceled/Forfeited			(3,894	)		$	16.1			(365	)	$	15.43		(4,259	)	$	16.04
	Expired			—				—			—			—		—			—

	Balance at February 2, 2013			49,637			$	13.28			2,759		$	15.43		52,396		$	13.39
	Granted			18,922			$	10.82			—			—		18,922		$	10.82
	Exercised			(15,482	)		$	9.4			—			—		(15,482	)	$	9.4
	Canceled/Forfeited			(3,921	)		$	15.15			(136	)	$	15.43		(4,057	)	$	15.16
	Expired			—				—			—			—		—			—

	Balance at February 1, 2014			49,156			$	13.4			2,623		$	15.43		51,779		$	13.51

	Vested or expected to vest at February 1, 2014			45,913			$	13.55

	Exercisable at February 1, 2014			25,318			$	14.88

	For time-based stock options vested and expected to vest at February 1, 2014, the aggregate intrinsic value was $128.3 million and the weighted average remaining contractual term was 6.2 years. For time-based stock options exercisable at February 1, 2014, the aggregate intrinsic value was $62.8 million and the weighted average remaining contractual term was 4 years. The aggregate intrinsic value of stock options exercised during fiscal 2014, 2013 and 2012 was $51.1 million, $33.6 million and $41.8 million, respectively. There was no aggregate intrinsic value for market-based stock options at February 1, 2014 and the weighted average remaining contractual term of market-based stock options vested and expected to reach the end of the vesting period at February 1, 2014 was 7.2 years. The Company’s closing stock price of $14.93 as reported on the NASDAQ Global Select Market as of January 31, 2014 was used to calculate the aggregate intrinsic value for all in-the-money options.

	As of February 1, 2014, the unamortized compensation expense for time-based stock options was $63.4 million and market-based stock options were fully amortized. The unamortized compensation expense for time-based options will be amortized on a straight-line basis and is expected to be recognized over a weighted average period of 2.8 years.
	Included in the following table is activity related to the non-vested portion of the restricted stock units as follows (in thousands, except for share prices):


			Restricted Stock				Weighted Average
			Outstanding				Grant Date Fair
			Value
Balance at January 29, 2011				5,486			$	18.75
Granted			6,877			$	15.8
Vested			(2,014	)		$	15.9
Canceled/Forfeited			(703	)		$	16.81

Balance at January 28, 2012			9,646			$	17.38
Granted			7,370			$	14.64
Vested			(2,796	)		$	17.78
Canceled/Forfeited			(1,481	)		$	17.16

Balance at February 2, 2013			12,739			$	15.78
Granted			3,828			$	10.78
Vested			(3,925	)		$	16.19
Canceled/Forfeited			(1,288	)		$	14.39

Balance at February 1, 2014			11,354			$	14.11

The aggregate intrinsic value of restricted stock units expected to vest as of February 1, 2014 was $157.7 million. The number of restricted stock units that are expected to vest is 10.6 million shares.
As of February 1, 2014, unamortized compensation expense related to restricted stock units was $86.5 million. The unamortized compensation expense for restricted stock units will be amortized on a straight-line basis and is expected to be recognized over a weighted average period of 1.7 years.
Share-Based Compensation
The following table presents details of share-based compensation expenses by functional line item (in thousands):


		Year Ended
		February 1,				February 2,			January 28,
		2014				2013			2012
Cost of goods sold		$	8,863			$	8,142		$	6,995
Research and development			109,432				87,149			85,924
Selling and marketing			13,940				13,278			12,920
General and administrative			23,638				18,711			14,024

		$	155,873			$	127,280		$	119,863

Share-based compensation capitalized in inventory was $1.7 million at February 1, 2014, $1.5 million at February 2, 2013, and $2.1 million at January 28, 2012.

Valuation Assumptions
The expected volatility for awards granted during fiscal 2014, 2013, and 2012 was based on an equally weighted combination of historical stock price volatility and implied volatility derived from traded options on the Company’s stock in the marketplace. The Company believes that the combination of historical volatility and implied volatility provides a better estimate of future stock price volatility.
The expected dividend yield is calculated by dividing annualized dividend payments by the closing stock price on the date of grant of the option.
The following weighted average assumptions were used for each respective period to calculate the fair value of each time-based equity award on the date of grant using the Black-Scholes option pricing model and of each market-based equity award using a Monte Carlo simulation model:


		Year Ended
		February 1,				February 2,			January 28,
		2014				2013			2012
Time-based Stock Options:
Weighted average fair value		$	3.43			$	5.52		$	6.05
Expected volatility			45	%			44	%		44	%
Expected term (in years)			5				4.8			4.8
Risk-free interest rate			0.8	%			0.9	%		2	%
Expected dividend yield			2.4	%			0.3	%		—


		Year Ended
		February 1,				February 2,			January 28,
		2014				2013			2012
Market-based Stock Options:
Weighted average fair value		$	—			$	—		$	5.08
Expected volatility			—	%			—	%		42	%
Risk-free interest rate			—	%			—	%		0.9 - 3.6	%
There were no market-based stock options granted during fiscal 2014 and 2013. In fiscal 2012, the Company issued 3.1 million stock options with a market-based condition for a group of senior employees. If the market price condition is not met within five years from the date of grant, the options automatically expire. The fair value of each market-based stock option award was estimated on the date of grant using a Monte Carlo simulation model that uses the assumptions noted in the above table, including the same volatility applied to the Company’s time-based options. Because a Monte Carlo simulation model incorporates ranges of assumptions for inputs, those ranges are disclosed where applicable. The Company uses historical data to estimate employee termination within the valuation model. The expected term was 2.66 years for market-based stock options granted in fiscal 2012 and was derived from the output of the valuation model and represents the period of time that options granted are expected to be outstanding.


		Year Ended
		February 1,				February 2,			January 28,
		2014				2013			2012
Employee Stock Purchase Plan:
Estimated fair value		$	3.65			$	3.13		$	4.63
Expected volatility			37	%			40	%		44	%
Expected term (in years)			1.3				1.2			1.1
Risk-free interest rate			0.2	%			0.2	%		0.1	%
Expected dividend yield			2	%			2.4	%		—

Share Repurchase Program
The Company’s board of directors initially authorized its current share repurchase program to repurchase up to $500 million of its outstanding common shares in August 2010. The Company’s board of directors authorized an additional $1.5 billion in fiscal 2012 and $1.0 billion in fiscal 2013 to be used to repurchase its common shares under the share repurchase program for a total available under the program of $3.0 billion. The Company intends to effect share repurchases in accordance with the conditions of Rule 10b-18 under the Exchange Act but may also make repurchases in the open market outside of Rule 10b-18 or in privately negotiated transactions. The share repurchase program will be subject to market conditions and other factors and does not obligate the Company to repurchase any dollar amount or number of its common shares and the repurchase program may be extended, modified, suspended or discontinued at any time.
The Company repurchased 33.1 million of its common shares for $354.1 million in cash during fiscal 2014, 91.0 million of its common shares for $959.1 million in cash during fiscal 2013 and 87.8 million of its common shares for $1.3 billion in cash during fiscal 2012. All of 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 February 1, 2014, a total of 216.9 million cumulative shares have been repurchased under the Company’s share repurchase program for a total $2.7 billion in cash and there was $258.4 million remaining available for future share repurchases.
Dividends
The Company announced the initiation of paying its first quarterly dividend of $0.06 per share in May 2012. As a result, cash dividends of $0.24 per share were paid for a total of $119.5 million during fiscal 2014, and cash dividends of $0.18 per share were paid for a total of $98.8 million during fiscal 2013. Future payment of a regular quarterly cash dividend on the Company’s common shares will be subject to, among other things, the best interests of the Company, the Company’s results of operations, cash balances and future cash requirements, financial condition, statutory requirements under Bermuda law and other factors that the Company’s board of directors may deem relevant. The Company’s dividend payments may change from time to time, and the Company cannot provide assurance that it will continue to declare dividends at all or in any particular amounts. In addition, developments in ongoing litigation could affect the Company’s ability to make a dividend payment on a declared payment date until such time as the Company can meet statutory requirements under Bermuda law.
On February 20, 2014, the Company announced that its board of directors declared a cash dividend of $0.06 per share to be paid on March 27, 2014 to shareholders of record as of March 13, 2014.

Segment_and_Geographic_Informa

Segment and Geographic Information	12 Months Ended
Segment and Geographic Information	Feb. 01, 2014
Segment and Geographic Information	'
	Note 13 — Segment and Geographic Information:
	The Company operates in one reportable segment — the design, development and sale of integrated circuits. The chief executive officer has been identified as the chief operating decision maker (“CODM”). The Company’s CODM is ultimately responsible and actively involved in the allocation of resources and the assessment of the Company’s operational and financial performance. The fact that the Company operates in only one reportable segment is based on the following:

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

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

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

		•		The decisions on allocation of resources and other operational decisions are made by the CODM based on his hands-on involvement with the Company’s operations and product development.
	The following tables present net revenue and long-lived asset information based on geographic region. Net revenue is based on the destination of the shipments and long-lived assets are based on the physical location of the assets (in thousands):


			Year Ended
	Net Revenue:		February 1,		February 2,		January 28,
	Net Revenue:		2014		2013		2012
	United States		$	68,321	$	176,581	$	194,638
	China			1,869,381		1,599,681		1,496,864
	Thailand			353,363		369,855		531,073
	Malaysia			352,756		351,401		420,382
	Philippines			257,899		246,269		207,450
	Others			502,680		424,843		542,633

			$	3,404,400	$	3,168,630	$	3,393,040



	Property and equipment, net:		February 1,		February 2,
	Property and equipment, net:		2014		2013
	Bermuda		$	4,453	$	5,691
	China			29,146		27,724
	Israel			33,758		36,671
	Singapore			76,367		78,047
	United States			195,253		208,459
	Others			17,188		16,379

			$	356,165	$	372,971

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


			Year Ended
	Net Revenue by End Market		February 1,		February 2,		January 28,
	Net Revenue by End Market		2014		2013		2012
	Storage		$	1,681,953	$	1,494,959	$	1,560,772
	Mobile and Wireless			839,407		822,533		968,706
	Networking			670,249		708,821		697,865
	Other			212,791		142,317		165,697

			$	3,404,400	$	3,168,630	$	3,393,040

Related_Party_Transactions

Related Party Transactions	12 Months Ended
Related Party Transactions	Feb. 01, 2014
Related Party Transactions	'
	Note 14 — Related Party Transactions:
	MIL is party to a technology license agreement with VeriSilicon Holdings Co., Ltd. (“VeriSilicon”). MIL assumed this technology license agreement between VeriSilicon and UTStarcom, Inc. after the Company’s acquisition of the semiconductor business of UTStarcom in December 2005. MIL has subsequently entered into various addenda to this agreement for additional technology beyond the scope of the original agreement. During fiscal 2013, MIL entered into two new addenda with VeriSilicon related to the technology license agreement. In addition, in September 2010, MIL entered into a services agreement with VeriSilicon, pursuant to which VeriSilicon has agreed to provide design support services to MIL. Under the services agreement, VeriSilicon helped on three projects for MIL during fiscal 2013. In connection with all of its transactions with VeriSilicon, MIL paid $2.0 million and $2.8 million to VeriSilicon during fiscal 2014 and fiscal 2013, respectively. As of February 1, 2014, the Company had $1.5 million of liability to VeriSilicon. Weili Dai’s brother (and Dr. Sehat Sutardja’s brother-in-law) is the Chairman, President and Chief Executive Officer of VeriSilicon. Ms. Dai is also a shareholder of VeriSilicon. Ms. Dai is a greater than ten percent shareholder of the Company and Dr. Sehat Sutardja is the Company’s Chief Executive Officer. Dr. Sehat Sutardja and Ms. Dai are husband and wife.
	In December 2009, MIL entered into a technology license agreement with Vivante Corporation (“Vivante”) that provides for the license of graphics technology and associated services. This agreement restates, expands and succeeds previous agreements between the parties for the same technology. In December 2012, the parties renewed this technology license agreement for another three years. The total amount of the license fee was approximately $13.0 million (to be paid over three years) and ten percent for support fees (to be paid over three years). In February 2012, the parties entered into a services agreement, pursuant to which Vivante agreed to provide support services to MIL. In connection with all of its transactions with Vivante, MIL paid $6.9 million and $8.6 million to Vivante during fiscal 2014 and fiscal 2013, respectively. As of February 1, 2014, the Company had $8.9 million of liability to Vivante. Dr. Sehat Sutardja and Ms. Dai, through their ownership and control of Estopia LLC, are indirect shareholders of Vivante. In addition, Dr. Sehat Sutardja is also a direct shareholder and Chairman of the board of directors of Vivante. Ms. Dai’s brother (and Dr. Sehat Sutardja’s brother-in-law) is the Chief Executive Officer of Vivante.

Subsequent_Events

Subsequent Events	12 Months Ended
Subsequent Events	Feb. 01, 2014
Subsequent Events	'
	Note 15 — Subsequent Events:
	Subsequent to the end of fiscal 2014, the Company continued discussions pertaining to certain outstanding litigation matters. In March 2014, these discussions progressed into more substantive negotiations. As a result of these ongoing negotiations, we believe resolution of certain outstanding litigation matters is now probable and can be reasonably estimated at $9.5 million. As these litigation matters existed as of the end of fiscal 2014, we recorded a charge of $9.5 million to cost of goods sold in the consolidated statement of operations for fiscal 2014. The amount recorded does not relate to the Company’s litigation with Carnegie Mellon University.

Supplementary_Data_Unaudited

Supplementary Data (Unaudited)	12 Months Ended
Supplementary Data (Unaudited)	Feb. 01, 2014
Supplementary Data (Unaudited)	'
	MARVELL TECHNOLOGY GROUP LTD.
	SUPPLEMENTARY DATA
	(Unaudited)
	The following table presents the unaudited consolidated statements of operations data for each of the eight quarters in the period ended February 1, 2014. In management’s opinion, this information has been presented on the same basis as the audited consolidated financial statements included in a separate section of this Annual Report on Form 10-K, and all necessary adjustments, consisting only of normal recurring adjustments, have been included in the amounts below to fairly state the unaudited quarterly results when read in conjunction with the audited consolidated financial statements and related notes. The operating results for any period should not be considered indicative of results to be expected in any future period. The Company expects the quarterly operating results to fluctuate in future periods due to a variety of reasons, including those discussed in Part I, Item 1A “Risk Factors.”


			Fiscal 2014
			First		Second		Third		Fourth
			Quarter		Quarter (1)		Quarter (2)		Quarter (3)
			(In thousands, except per share amounts)
	Net revenue		$	734,369	$	807,056	$	931,226	$	931,749
	Gross profit		$	398,931	$	420,997	$	466,245	$	454,497
	Net income		$	53,209	$	61,826	$	103,156	$	97,129
	Net income per share:
	Basic		$	0.11	$	0.13	$	0.21	$	0.2
	Diluted		$	0.11	$	0.12	$	0.21	$	0.19


			Fiscal 2013
			First		Second		Third		Fourth
			Quarter (4)		Quarter (5)		Quarter		Quarter (6)
			(In thousands, except per share amounts)
	Net revenue		$	796,351	$	816,104	$	780,881	$	775,294
	Gross profit		$	430,029	$	434,265	$	406,378	$	404,461
	Net income		$	94,543	$	93,074	$	68,816	$	50,152
	Net income per share:
	Basic		$	0.16	$	0.17	$	0.12	$	0.1
	Diluted		$	0.16	$	0.16	$	0.12	$	0.09

	-1	The second quarter of fiscal 2014 includes $5.2 million for litigation settlements that do not relate to the litigation with Carnegie Mellon University.
	-2	The third quarter of fiscal 2014 includes $4.2 million of restructuring and other exit-related costs.
	-3	The fourth quarter of fiscal 2014 includes $9.5 million for anticipated litigation settlements that do not relate to the litigation with Carnegie Mellon University, a $7.0 million gain from the sale of a business and $8.1 million charge for the impairment of an intangible asset.
	-4	The first quarter of fiscal 2013 includes $2.5 million for expenses related to acquisitions in prior fiscal years.
	-5	The second quarter of fiscal 2013 includes $1.6 million for expenses related to acquisitions in prior fiscal years.
	-6	The fourth quarter of fiscal 2013 includes $5.7 million for an expense related to an ongoing litigation that did not relate to the litigation with Carnegie Mellon University.

SCHEDULE_II_VALUATION_AND_QUAL

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS	Feb. 01, 2014
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS	'
	SCHEDULE II
	VALUATION AND QUALIFYING ACCOUNTS
	(in thousands)


		Balance at		Additions		Deductions			Balance at
		Beginning							End of
		of Year							Year
	Fiscal year ended February 1, 2014
	Allowance for doubtful accounts and sales return reserve	$	7,921	$	3,808	$	(9,435	)	$	2,294

	Deferred tax valuation	$	299,449	$	36,441	$	—		$	335,890

	Fiscal year ended February 2, 2013
	Allowance for doubtful accounts and sales return reserve	$	2,663	$	9,024	$	(3,766	)	$	7,921

	Deferred tax valuation	$	259,316	$	40,133	$	—		$	299,449

	Fiscal year ended January 28, 2012
	Allowance for doubtful accounts and sales return reserve	$	7,366	$	4,393	$	(9,096	)	$	2,663

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

The_Company_and_its_Significan1

The Company and its Significant Accounting Policies (Policies)	12 Months Ended
	Feb. 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 2014 and fiscal 2012 each had a 52-week period, and fiscal 2013 had a 53-week period.
	Certain amounts in the consolidated financial statements and notes to consolidated financial statements for prior years have been reclassified to conform to the fiscal 2014 presentation. Net operating results have not been affected by these reclassifications.
Use of Estimates	'
	Use of Estimates
	The preparation of consolidated financial statements in conformity with generally accepted accounting principles in the United States (“GAAP”) requires management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to performance-based compensation, revenue recognition, provisions for sales returns and allowances, inventory excess and obsolescence, investment fair values, goodwill and other intangible assets, restructuring, income taxes, litigation and other contingencies. In addition, the Company uses assumptions when employing the Monte Carlo simulation and Black-Scholes valuation models to calculate the fair value of share-based awards that are granted. Actual results could differ from these estimates, and such differences could affect the results of operations reported in future periods.
Principles of Consolidation	'
	Principles of Consolidation
	The 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.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with a maturity of three months or less from the date of purchase to be cash equivalents. Cash and cash equivalents consist of cash on deposit with banks, time deposits, U.S. government and agency debt, municipal debt securities, corporate debt securities and money market funds.
Investments	'
	Investments
	The Company’s marketable investments are classified as available-for-sale and are reported at fair value. The Company determines any realized gains or losses on the sale of available-for-sale securities on a specific identification method, and such gains and losses are recorded as a component of interest and other income, net. Unrealized gains and losses of the available-for-sale securities are excluded from earnings and reported as a component of accumulated other comprehensive income. The Company assesses whether an other-than-temporary impairment loss on its available-for-sale securities has occurred due to declines in fair value or other market conditions. Declines in fair value that are considered other-than-temporary are recorded as an impairment of investments in interest and other income, net in the consolidated statements of operations.
	In general, investments with original maturities of greater than 90 days and remaining maturities of less than one year are classified as short-term investments. Investments with maturities beyond one year may also be classified as short-term based on their highly liquid nature and because such investments represent the investment of cash that is available for current operations.
	The Company also has equity investments in privately-held companies. If the Company has the ability to exercise significant influence over the investee, but not control, or if the investee is a partnership type investment, the Company accounts for the investments under the equity method. If the Company does not have the ability to exercise significant influence over the operations of the investee, the Company accounts for the investment under the cost method. Investments in privately-held companies are included in other non-current assets.
Impairment of Investments	'
	Impairment of Investments
	If a debt security’s market value is below amortized cost and the Company either intends to sell the security or it is more likely than not that the Company will be required to sell the security before its anticipated recovery, the Company records an other-than-temporary impairment charge to interest and other income, net in the consolidated statements of operations.
	Investments in privately-held companies are subject to a periodic impairment review. Investments are considered impaired when the fair value is below the investment’s cost basis and the decline in value is judged to be other-than-temporary. This assessment is based on a qualitative and quantitative analysis, including, but not limited to, the investee’s revenue and earnings trends, available cash and liquidity, and the status of the investee’s products and the related market for such products. During fiscal 2014, the Company recorded a charge of $1.5 million to write down equity investments that were considered to be impaired.
Derivative Financial Instruments	'
	Derivative Financial Instruments
	The Company accounts for its derivative instruments as either assets or liabilities and carries them at fair value. For derivative instruments that hedge the exposure to variability in expected future cash flows and are designated as cash flow hedges, the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income in shareholders’ equity and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument is recognized in current earnings. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions. Derivatives that are not designated as hedges must be adjusted to fair value through earnings.
Concentration of Credit Risk and Significant Customers	'
	Concentration of Credit Risk and Significant Customers
	Financial instruments that potentially subject the Company to a significant concentration of credit risk consist principally of cash equivalents, short-term investments and accounts receivable. Cash, cash equivalents and short-term investments balances are maintained with high quality financial institutions, the composition and maturities of which are regularly monitored by management. The Company believes that the concentration of credit risk in its trade receivables, which consists of a customer base located primarily in the Asia Pacific Region, is substantially mitigated by the Company’s credit evaluation process, relatively short collection terms and the high level of credit worthiness of its customers. The Company performs ongoing credit evaluations of its customers’ financial conditions and limits the amount of credit extended when deemed necessary based upon payment history and the customer’s current credit worthiness, but generally requires no collateral. The Company regularly reviews the allowance for bad debt and doubtful accounts by considering factors such as historical experience, credit quality, age of the accounts receivable balances and current economic conditions that may affect a customer’s ability to pay.
	The allowance for doubtful accounts at February 1, 2014 and February 2, 2013 was $1.3 million and $1.0 million, respectively. Please see “Note 1 – The Company and its Significant Accounting Policies – Revenue Recognition” for additional information on sales returns and allowances.
	Historically, a relatively small number of customers have accounted for a significant portion of the Company’s net revenue. The Company had two end customers who each represented greater than 10% of its total net revenue in fiscal 2014. Combined revenue from these two customers was 36% of total net revenue in fiscal 2014. The Company had three end customers who represented greater than 10% of its total net revenue in fiscal 2013. Combined revenue from these three customers was 44% of total net revenue in fiscal 2013. The Company had one end customer who represented greater than 10% of its total net revenue in fiscal 2012. Revenue from this customer was 19% of total net revenue in fiscal 2012.
	The Company’s accounts receivable was concentrated with one customer at February 1, 2014, representing 13% of gross accounts receivable, and with two customers at February 2, 2013, representing 19% and 15% of gross accounts receivable, respectively.
	No distributors accounted for more than 10% of the Company’s net revenue in fiscal 2014. In each of fiscal 2013 and 2012, one distributor accounted for more than 10% of the Company’s net revenue. The Company continuously monitors the creditworthiness of its distributors and believes these distributors’ sales to diverse end customers and to diverse geographies further serve to mitigate the Company’s exposure to credit risk.
Inventories	'
	Inventories
	Inventory is stated at the lower of cost or market, cost being determined under the first-in, first-out method. The total carrying value of the Company’s inventory is reduced for any difference between cost and estimated market value of inventory that is determined to be excess, obsolete or unsellable inventory based upon assumptions about future demand and market conditions. If actual future demand for the Company’s products is less than currently forecasted, the Company may be required to write inventory down below the current carrying value. Once the carrying value of inventory is reduced, it is maintained until the product to which it relates to is sold or otherwise disposed of. Shipping and handling costs are classified as a component of cost of goods sold in the consolidated statements of operations.
Property and Equipment, Net	'
	Property and Equipment, Net
	Property and equipment, net, are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which ranges from three to seven years for machinery and equipment, computer software, and furniture and fixtures. Buildings are depreciated over an estimated useful life of 30 years and building improvements are depreciated over estimated useful lives of 15 years. Leasehold improvements are depreciated using the shorter of the remaining lease term or the estimated useful life of the asset.
Goodwill	'
	Goodwill
	Goodwill is recorded when the consideration paid for a business acquisition exceeds the fair value of net tangible and intangible assets acquired. Goodwill is measured and tested for impairment annually or more frequently if the Company believes indicators of impairment exist. First, the Company assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the company concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, then a two-step quantitative impairment test is performed. The first step requires comparing the fair value of the reporting unit to its net book value, including goodwill. As the Company has only one reporting unit, the fair value of the reporting unit is determined by taking the market capitalization of the Company as determined through quoted market prices and adjusted for control premiums and other relevant factors. A potential impairment exists if the fair value of the reporting unit is lower than its net book value. The second step of the process is only performed if a potential impairment exists, and it involves determining the difference between the fair value of the reporting unit’s net assets other than goodwill and the fair value of the reporting unit. If the difference is less than the net book value of goodwill, impairment exists and is recorded. In the event that the Company determines that the value of goodwill has become impaired, the Company will record a charge for the amount of impairment during the fiscal quarter in which the determination is made. The Company has not been required to perform this second step of the process because the fair value of the reporting unit has sufficiently exceeded its net book value at every measurement date.
Long-Lived Assets and Intangible Assets	'
	Long-Lived Assets and Intangible Assets
	The Company assesses the impairment of long-lived assets and intangible assets whenever events or changes in circumstances indicate that the carrying amount of long-lived assets may not be recoverable. The Company estimates the future cash flows, undiscounted and without interest charges, expected to be generated by the assets from its use or eventual disposition. If the sum of the expected future cash flows is less than the carrying amount of those assets, the Company recognizes an impairment loss based on the excess of the carrying amount over the fair value of the assets. Please see “Note 7 – Goodwill and Acquired Intangible Assets” for further details regarding impairment of acquisition-related identified intangible assets.
	Acquisition-related identified intangible assets are amortized on a straight-line basis over their estimated economic lives. In-process research and development (“IPR&D”) is not amortized until the completion of the related development.
Foreign Currency Transactions	'
	Foreign Currency Transactions
	The functional currency of all of the Company’s non-U.S. operations is the U.S. dollar. Monetary accounts maintained in currencies other than the U.S. dollar are re-measured using the foreign exchange rate at the balance sheet date. Operational accounts and nonmonetary balance sheet accounts are measured and recorded at the rate in effect at the date of the transaction. The effects of foreign currency re-measurement are reported in current operations.
Revenue Recognition	'
	Revenue Recognition
	The Company recognizes revenue when there is persuasive evidence of an arrangement, delivery has occurred, the fee is fixed or determinable, and collection is reasonably assured.

	Product revenue is generally recognized upon shipment of product to customers, net of accruals for estimated sales returns and rebates. However, some of the Company’s sales are made through distributors under agreements allowing for price protection, shipped from stock pricing adjustment rights, and limited rights of stock rotation on products unsold by the distributors. Although title passes to the distributor upon shipment terms and payment by the Company’s distributors is not contingent on resale of the product, product revenue on sales made through distributors with price protection, shipped from stock pricing adjustment rights and stock rotation rights are deferred until the distributors sell the product to end customers. Deferred revenue less the related cost of the inventories is reported as deferred income. The Company does not believe that there is any significant exposure related to impairment of deferred cost of sales, as its historical returns have been minimal and inventory turnover for its distributors generally ranges from 60 to 90 days. The Company’s sales to direct customers are made primarily pursuant to standard purchase orders for delivery of products.
	A portion of the Company’s net revenue is derived from sales through third-party logistics providers, who maintain warehouses in close proximity to the customer’s facilities. Revenue from sales through these third-party logistics providers is not recognized until the product is pulled from stock by the end customer.
	The provision for estimated sales returns on product sales is recorded in the same period the related revenues are recorded. These estimates are based on historical returns, analysis of credit memo data and other known factors. Actual returns could differ from these estimates. The Company accounts for rebates by recording reductions to revenue for rebates in the same period that the related revenue is recorded. The amount of these reductions is based upon the terms agreed to with the customer.
Advertising Expense	'
	Advertising Expense
	Advertising costs are expensed as incurred.
Share-Based Compensation	'
	Share-Based Compensation
	Share-based compensation is measured at the grant date, based on the fair value of the award, and is recognized as expense over the requisite service period. The Company amortizes share-based compensation expense for time-based and market-based awards under the straight-line attribution method over the vesting period, which is generally four years for annual grants to employees and five years for new hire grants. Performance-based awards are amortized using the accelerated method.
	The Company estimates the fair value of time-based stock option awards on the date of grant using the Black Scholes option-pricing model. The fair value of market-based stock option awards is estimated on the date of grant using a Monte Carlo simulation model. The value of the portion of the awards that is ultimately expected to vest is recognized as expense over the requisite service periods. The Black Scholes and Monte Carlo models incorporate various highly subjective assumptions including expected term of awards, expected future stock price volatility and expected forfeiture rates.
	In developing estimates used to calculate assumptions, the Company establishes the expected term for employee stock options, as well as expected forfeiture rates, based on the historical settlement experience and after giving consideration to vesting schedules. Assumptions for stock option exercises and pre-vesting terminations of stock options were stratified by employee groups with sufficiently distinct behavior patterns. Expected volatility was developed based on equally weighted combination of historical stock price volatility and implied volatility derived from traded options on the Company’s stock in the marketplace. The expected dividend yield is calculated by dividing annualized dividend payments by the closing stock price on the grant date of the option.

	Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from initial estimates. Share-based compensation expense is recorded net of estimated forfeitures such that expense is recorded only for those share-based awards that are expected to vest. Previously recognized expense is reversed for the portion of awards forfeited prior to vesting as and when forfeitures occurred.
	The fair value of each restricted stock unit is estimated based on the market price of the Company’s common shares on the date of grant less the expected dividend yield.
Comprehensive Income	'
	Comprehensive Income
	Comprehensive income is comprised of net income and unrealized gains and losses, net of tax, on available-for-sale securities, auction rate securities and cash flow hedges. Accumulated other comprehensive income, as presented on the accompanying balance sheets, consists of net unrealized gains and losses on available-for-sale securities, auction rate securities, and cash flow hedges, net of tax.
Accounting for Income Taxes	'
	Accounting for Income Taxes
	The Company recognizes income taxes using an asset and liability approach. This approach requires the recognition of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in the Company’s consolidated financial statements or tax returns. The measurement of current and deferred taxes is based on provisions of the enacted tax law and the effects of future changes in tax laws or rates are not anticipated.
	Evaluating the need for an amount of a valuation allowance for deferred tax assets often requires judgment and analysis of all the positive and negative evidence available to determine whether all or some portion of the deferred tax assets will not be realized. A valuation allowance must be established for deferred tax assets when it is more likely than not that they will not be realized. Based on the available evidence and judgment, the Company has determined that it is more likely than not that U.S. research credits and certain acquired net operating losses will not be realized and therefore the Company has provided a full valuation allowance against these credits. If there is a change in the Company’s ability to realize its deferred tax assets, then the Company’s tax provision may decrease in the period in which it determines that realization is more likely than not.
	As a multinational corporation, the Company conducts its business in many countries and is subject to taxation in many jurisdictions. The taxation of the Company’s business is subject to the application of various and sometimes conflicting tax laws and regulations as well as multinational tax conventions. The Company’s effective tax rate is highly dependent upon the geographic distribution of its worldwide earnings or losses, the tax regulations and tax holidays in each geographic region, the availability of tax credits and carryforwards, and the effectiveness of its tax planning strategies. The application of tax laws and regulations is subject to legal and factual interpretation, judgment and uncertainty. Tax laws themselves are subject to change as a result of changes in fiscal policy, changes in legislation, and the evolution of regulations and court rulings. Consequently, taxing authorities may impose tax assessments or judgments against the Company that could materially impact its tax liability and/or its effective income tax rate.
	The Company is subject to income tax audits by the respective tax authorities in all of the jurisdictions in which the Company operates. The Company recognizes the effect of income tax positions only if these positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is more than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest and penalties related to unrecognized tax benefits in income tax expense. The calculation of the Company’s tax liabilities involves the inherent uncertainty associated with the application of GAAP and complex tax laws. The Company believes it has adequately provided for in its financial statements additional taxes that it estimates may be required to be paid as a result of such examinations. While the Company believes that it has adequately provided for all tax positions, amounts asserted by tax authorities could be greater or less than the Company’s accrued position. These tax liabilities, including the interest and penalties, are released pursuant to a settlement with tax authorities, completion of audit or expiration of various statutes of limitation. The material jurisdictions in which the Company may be subject to potential examination by tax authorities throughout the world include China, Israel, Singapore, Switzerland and the United States.
Warranty	'
	Warranty
	The Company’s products are generally subject to warranty, which provides for the estimated future costs of repair, replacement or customer accommodation upon shipment of the product. The Company’s products carry a standard 90 day warranty, with certain exceptions in which the warranty period can extend to more than one year based on contractual agreements. The warranty accrual is primarily estimated based on historical claims compared to historical revenues and assumes that the Company will have to replace products subject to a claim. From time to time, the Company becomes aware of specific warranty situations, and it records specific accruals to cover these exposures.
Accounting Pronouncements Recently Adopted	'
	Accounting Pronouncements Recently Adopted
	The Company adopted the new accounting standard regarding the testing of indefinite-lived intangible assets for impairment at the beginning of fiscal 2014. This amended guidance allows an entity first to assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test in accordance with the guidance on the impairment of intangible assets other than goodwill. The adoption of this guidance had no impact on the Company’s financial statements.
	The Company adopted the new accounting standard regarding the reporting of amounts reclassified out of accumulated other comprehensive income. The amendments require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either in the financial statements or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. The Company elected to disclose the information in the Notes to Consolidated Financial Statements beginning in fiscal 2014.

Acquisitions_and_Divestitures_

Acquisitions and Divestitures (Tables)	12 Months Ended
Acquisitions and Divestitures (Tables)	Feb. 01, 2014
Schedule of Purchase Price Allocation	'
	The purchase price of Xelerated was allocated as follows (in thousands):


	Accounts receivable	$	2,407
	Inventory		6,481
	Prepaid and other current assets		111
	Property and equipment		441

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

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

	Net assets acquired	$	75,156

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	'
	The acquired intangible assets from Xelerated were recognized as follows based upon their fair value as of the acquisition date (in thousands):


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

	Total	$	51,800

Investments_Tables

Investments (Tables)	12 Months Ended
Investments (Tables)	Feb. 01, 2014
Schedule of Available-for-sale Securities Reconciliation	'
	The following tables summarize the Company’s investments (in thousands):


		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



		February 2, 2013
		Amortized		Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Short-term investments:
	Available-for-sale:
	Corporate debt securities	$	577,120	$	2,886		$	(382	)	$	579,624
	U.S. government and agency debt		318,226		258			(5	)		318,479
	Time deposits		188,000		—			—			188,000
	Asset backed securities		76,629		50			(64	)		76,615
	Foreign government and agency debt		4,320		—			(1	)		4,319

	Total short-term investments		1,164,295		3,194			(452	)		1,167,037
	Long-term investments:
	Available-for-sale:
	Auction rate securities		19,450		—			(2,681	)		16,769

	Total long-term investments		19,450		—			(2,681	)		16,769

	Total investments	$	1,183,745	$	3,194		$	(3,133	)	$	1,183,806

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


		February 1, 2014					February 2, 2013
		Amortized		Estimated			Amortized			Estimated
		Cost		Fair Value			Cost			Fair Value
	Due in one year or less	$	309,543	$	309,861		$	519,006		$	519,537
	Due between one and five years		686,062		688,280			627,769			629,991
	Due over five years		24,666		21,793			36,970			34,278

		$	1,020,271	$	1,019,934		$	1,183,745		$	1,183,806

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):


		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	)



		February 2, 2013
		Less than 12 months					12 months or more						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Loss			Value			Loss			Value		Loss
	Corporate debt securities	$	141,915	$	(382	)	$	—		$	—		$	141,915	$	(382	)
	Asset backed securities		43,882		(64	)		—			—			43,882		(64	)
	U.S. government and agency debt		14,677		(5	)		—			—			14,677		(5	)
	Foreign government and agency debt		4,319		(1	)		—			—			4,319		(1	)
	Auction rate securities		—		—			16,769			(2,681	)		16,769		(2,681	)

	Total securities	$	204,793	$	(452	)	$	16,769		$	(2,681	)	$	221,562	$	(3,133	)

Supplemental_Financial_Informa1

Supplemental Financial Information (Tables)	12 Months Ended
Supplemental Financial Information (Tables)	Feb. 01, 2014
Schedule of Cash and Cash Equivalents	'

		February 1,			February 2,
		2014			2013
	Cash and cash equivalents:
	Cash	$	694,789		$	583,527
	Cash equivalents:
	Time deposits		247,958			119,874
	U.S. government and agency debt		11,999			27,029
	Municipal debt securities		4,800			—
	Corporate debt securities		3,400			—
	Money market funds		2,804			21,523

	Cash and cash equivalents	$	965,750		$	751,953

Schedule of Inventory, Current	'

		February 1,			February 2,
		2014			2013
	Inventories:
	Work-in-process	$	195,495		$	140,805
	Finished goods		152,366			109,615

	Inventories	$	347,861		$	250,420

Property, Plant and Equipment	'

		February 1,			February 2,
		2014			2013
	Property and equipment, net:
	Machinery and equipment	$	562,038		$	532,420
	Buildings		144,320			144,320
	Computer software		96,096			89,548
	Land		53,373			53,373
	Building improvements		49,645			49,516
	Leasehold improvements		49,060			46,205
	Furniture and fixtures		27,621			25,301
	Construction in progress		2,911			5,333

			985,064			946,016
	Less: Accumulated depreciation		(628,899	)		(573,045	)

	Property and equipment, net	$	356,165		$	372,971

Schedule of Other Assets, Noncurrent	'

		February 1,			February 2,
		2014			2013
	Other non-current assets:
	Technology and other licenses	$	83,521		$	81,523
	Deferred tax assets		19,282			26,291
	Investments in privately-held companies		14,565			14,486
	Prepaid land use rights		13,744			14,056
	Deposits		12,433			10,451
	Other		16,821			18,078

	Other non-current assets	$	160,366		$	164,885

Schedule of Accrued Liabilities	'

		February 1,			February 2,
		2014			2013
	Accrued liabilities:
	Accrued rebates	$	61,616		$	51,712
	Accrued royalties		36,568			16,298
	Technology license obligations		18,482			9,865
	Accrued legal expense		14,589			14,754
	Accrued share repurchases		—			22,152
	Other		30,507			29,210

	Accrued liabilities	$	161,762		$	143,991

Other Noncurrent Liabilities	'

		February 1,			February 2,
		2014			2013
	Other non-current liabilities:
	Technology license obligations	$	28,959		$	34,270
	Long-term accrued employee compensation		4,370			6,205
	Other		9,140			15,935

	Other non-current liabilities	$	42,469		$	56,410

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


		Unrealized			Unrealized			Unrealized			Total
		Gain			Loss on			Gain
		(Loss) on			Auction			(Loss) on
		Marketable			Rate			Cash Flow
		Securities			Securities			Hedges
	Balance at February 2, 2013	$	2,742		$	(2,681	)	$	1,087		$	1,148
	Other comprehensive income (loss) before reclassifications		931			(190	)		3,466			4,207
	Amounts reclassified from accumulated other comprehensive income		(1,139	)		—			(3,619	)		(4,758	)

	Net current-period other comprehensive loss		(208	)		(190	)		(153	)		(551	)

	Balance at February 1, 2014	$	2,534		$	(2,871	)	$	934		$	597



		Unrealized			Unrealized			Unrealized			Total
		Gain			Loss on			Gain
		(Loss) on			Auction			(Loss) on
		Marketable			Rate			Cash Flow
		Securities			Securities			Hedges
	Balance at January 28, 2012	$	3,702		$	(1,285	)	$	(1,641	)	$	776
	Other comprehensive income (loss) before reclassifications		2,141			(1,396	)		233			978
	Amounts reclassified from accumulated other comprehensive income		(3,101	)		—			2,495			(606	)

	Net current-period other comprehensive income (loss)		(960	)		(1,396	)		2,728			372

	Balance at February 2, 2013	$	2,742		$	(2,681	)	$	1,087		$	1,148

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):


		Year Ended
		February 1,
	Affected Line Item in the	2014
	Statement of Operations
	Available-for-sale securities:
	Interest and other income, net	$	1,139
	Cash flow hedges:
	Cost of goods sold		200
	Research and development		3,129
	Selling and marketing		266
	General and administrative		24

	Total	$	4,758

Schedule of Calculation of Numerator and Denominator in Earnings Per Share	'
	The computations of basic and diluted net income per share are presented in the following table (in thousands, except per share amounts):


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Numerator:
	Net income	$	315,320		$	306,585		$	615,091

	Denominator:
	Weighted average shares — basic		496,518			555,310			607,857
	Effect of dilutive securities:
	Share-based awards		7,895			7,813			15,411

	Weighted average shares — diluted		504,413			563,123			623,268

	Net income per share:
	Basic	$	0.64		$	0.55		$	1.01
	Diluted	$	0.63		$	0.54		$	0.99


		February 1,			February 2,			January 28,
		2014			2013			2012
	Anti-dilutive potential shares:
	Weighted average shares outstanding from stock options		39,593			28,124			21,014

	Weighted average exercise price:	$	15.14		$	17.48		$	18.79

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
Derivative Financial Instruments (Tables)	Feb. 01, 2014
Schedule of Derivative Instruments	'
	The notional amounts of outstanding forward contracts were as follows (in thousands):


		Buy Contracts
		February 1,		February 2,
		2014		2013
	Israeli shekel	$	39,670	$	38,249
	Euro		5,718		—
	Swedish krona		3,709		—

		$	49,097	$	38,249

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
Fair Value Measurements (Tables)	Feb. 01, 2014
Fair Value, Assets Measured on Recurring Basis	'
	The tables do not include assets and liabilities that are measured at historical cost or any basis other than fair value (in thousands):


			Level 1				Level 2			Level 3			Portion of
													Carrying
													Value
													Measured at
													Fair Value
													at February 1,
													2014
	Items measured at fair value on a recurring basis:
	Assets
	Cash equivalents:
	Money market funds		$	2,804			$	—		$	—		$	2,804
	Time deposits			—				247,958			—			247,958
	Municipal debt securities			—				4,800			—			4,800
	U.S. government and agency debt			11,999				—			—			11,999
	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



			Level 1				Level 2			Level 3			Portion of
													Carrying
													Value
													Measured at
													Fair Value
													at February 2,
													2013
	Items measured at fair value on a recurring basis:
	Assets
	Cash equivalents:
	U.S. government and agency debt		$	27,029			$	—		$	—		$	27,029
	Money market funds			21,523				—			—			21,523
	Time deposits			—				119,874			—			119,874
	Short-term investments:
	U.S. government and agency debt			318,479				—			—			318,479
	Corporate debt securities			—				579,624			—			579,624
	Time deposits			—				188,000			—			188,000
	Asset backed securities			—				76,615			—			76,615
	Foreign government and agency debt			—				4,319			—			4,319
	Prepaid expenses and other current assets:
	Foreign currency forward contracts			—				1,144			—			1,144
	Long-term investments:
	Auction rate securities			—				—			16,769			16,769
	Other non-current assets:
Severance pay fund			—				1,977			—			1,977

Total assets		$	367,031			$	971,553		$	16,769		$	1,355,353

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	'
	The following table summarizes the change in fair values for Level 3 assets for the year ended February 1, 2014 and February 2, 2013 (in thousands):


			Level 3
	Changes in fair value during the year (pre-tax):
	Ending balance at January 28, 2012		$	23,215
	Sales, redemption and settlement			(5,050	)
	Unrealized loss included in accumulated other comprehensive income			(1,396	)

	Ending balance at February 2, 2013			16,769
	Sales, redemption and settlement			(300	)
	Unrealized loss included in accumulated other comprehensive income			(190	)

	Ending balance at February 1, 2014		$	16,279

Goodwill_and_Acquired_Intangib1

Goodwill and Acquired Intangible Assets (Tables)	12 Months Ended
Goodwill and Acquired Intangible Assets (Tables)	Feb. 01, 2014
Summary of Activity Related to Goodwill	'
	The following table summarizes the activity related to the carrying value of goodwill (in thousands):


	Balance at January 28, 2012		$	2,031,991
	Additions due to business combinations			147

	Balance at February 2, 2013			2,032,138
	Additions due to business combinations			400
	Sale of a business			(2,593	)

	Balance at February 1, 2014		$	2,029,945

Schedule of Finite-Lived Intangible Assets by Major Class	'
	The carrying amounts of acquired intangible assets are as follows (in thousands):


						February 1, 2014							February 2, 2013
			Range of			Gross		Accumulated			Net		Gross		Accumulated			Net
			Useful Lives			Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
						Amounts		and			Amounts		Amounts		and			Amounts
								Write-Offs							Write-Offs
	Purchased technology			4 - 7 years		$	49,240	$	(20,634	)	$	28,606	$	54,690	$	(18,552	)	$	36,138
	Core technology			5 - 8 years			2,350		(1,583	)		767		138,650		(123,298	)		15,352
	Trade names			5 years			1,300		(568	)		732		1,300		(308	)		992
	Customer intangibles			5 - 7 years			28,600		(13,056	)		15,544		89,400		(61,927	)		27,473
	IPR&D			*			3,386		—			3,386		9,700		—			9,700

	Total acquired intangible assets, net					$	84,876	$	(35,841	)	$	49,035	$	293,740	$	(204,085	)	$	89,655



	*	Upon completion of the projects, the related IPR&D assets will be amortized over its estimated useful life. If any of the projects are abandoned or the forecast of the project indicates that the fair value is less than the carrying amount, the Company will be required to write down the related IPR&D asset.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	'
	Based on the identified intangible assets recorded at February 1, 2014, the future amortization expense of identified intangibles excluding IPR&D for the next five fiscal years is as follows (in thousands):


	Fiscal Year
	2015		$	14,951
	2016			12,212
	2017			11,027
	2018			5,599
	2019			1,860
	Thereafter			—

			$	45,649

Restructuring_Tables

Restructuring (Tables)	12 Months Ended
Restructuring (Tables)	Feb. 01, 2014
Schedule of Restructuring Reserve by Type of Cost	'
	The following table presents details of restructuring charges by functional line item (in thousands):


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Research and development	$	2,886		$	47		$	728
	Selling and marketing		795			(3	)		8
	General and administrative		1,051			1,213			1,120

		$	4,732		$	1,257		$	1,856

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 restructuring charges (in thousands):


		Severance			Facilities			Other			Total
		and Related			and Related			Exit-Related
		Costs			Costs			Costs
	Balance at January 28, 2012	$	—		$	2,917		$	—		$	2,917
	Restructuring charges		—			553			—			553
	Net cash payments		—			(1,329	)		—			(1,329	)
	Non-cash adjustments		—			10			—			10
	Adjustments to previous estimates		—			704			—			704

	Balance at February 2, 2013		—		$	2,855		$	—			2,855
	Restructuring charges		2,786			1,672			213			4,671
	Net cash payments		(2,735	)		(2,144	)		(194	)		(5,073	)

	Balance at February 1, 2014	$	51		$	2,383		$	19		$	2,453

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Feb. 01, 2014
Schedule of US and non US Components of Income Before Income Tax Expense (Benefit)	'
	The U.S. and non-U.S. components of income before income taxes consist of the following (in thousands):


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	U.S. operations	$	31,339		$	34,900		$	28,039
	Non-U.S. operations		274,918			275,290			591,020

		$	306,257		$	310,190		$	619,059

Schedule of Components of Income Tax Expense (Benefit)	'
	The provision (benefit) for income taxes consists of the following (in thousands):


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Current income tax provision (benefit):
	Federal	$	5,774		$	4,461		$	8,183
	State		73			407			99
	Foreign		(18,829	)		(8,289	)		(1,069	)

	Total current income tax provision (benefit)		(12,982	)		(3,421	)		7,213
	Deferred income tax provision (benefit):
	Federal		317			6,306			(1,361	)
	State		32			90			1,078
	Foreign		3,570			630			(2,962	)

	Total deferred income tax provision (benefit)		3,919			7,026			(3,245	)

	Total provision (benefit) for income taxes	$	(9,063	)	$	3,605		$	3,968

Schedule of Deferred Tax Assets and Liabilities	'
	Deferred tax assets consist of the following (in thousands):


		February 1,			February 2,
		2014			2013
	Deferred tax assets:
	Federal and California research and other tax credits	$	335,894		$	299,475
	Reserves and accruals		25,833			27,830
	Share-based compensation		4,067			3,523
	Net operating losses		18,470			20,553

	Gross deferred tax assets		384,264			351,381
	Valuation allowance		(335,890	)		(299,449	)

	Total deferred tax assets		48,374			51,932
	Total deferred tax liabilities		(17,586	)		(17,225	)

	Net deferred tax assets	$	30,788		$	34,707

Reconciliation of United States Statutory Federal Tax Rate	'
	Reconciliation of the statutory federal income tax to the Company’s effective tax:


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Provision at U.S. notional statutory rate		35	%		35	%		35	%
	Non-deductible share-based compensation		19.4			15.4			6.9
	Difference in U.S. and non-U.S. tax rates		(55.8	)		(48.8	)		(40.7	)
	Benefits from utilization of general business credits		(14.1	)		(13.8	)		(6.8	)
	Change in valuation allowance		11.9			12.9			5.6
	Other		0.6			0.5			0.6

	Effective tax rate		(3.0	)%		1.2	%		0.6	%

Unrecognized Tax Benefits Reconciliation	'
	The following table reflects changes in the unrecognized tax benefits (in thousands):


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Unrecognized tax benefits at beginning of the year	$	79,031		$	96,294		$	102,612
	Increases related to prior year tax positions		499			1,106			987
	Decreases related to prior year tax positions		(111	)		—			(307	)
	Increases related to current year tax positions		2,666			1,139			1,229
	Settlements		(7,423	)		(3,956	)		(243	)
	Lapse in the statute of limitations		(13,969	)		(15,543	)		(9,529	)
	Foreign exchange (gain) loss		(9,011	)		(9	)		1,545

	Gross amounts of unrecognized tax benefits at end of the year	$	51,682		$	79,031		$	96,294

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Feb. 01, 2014
Future Minimum Lease Payments, Net of Estimated Sublease Income under Operating and Capital Leases	'
	Future minimum lease payments, net of estimated sublease, and payments under technology license obligations as of February 1, 2014, are presented in the following tables (in thousands):


	Fiscal Year:	Minimum			Sublease			Net
		Lease			Income			Operating
		Payments						Leases
	2015	$	75,678		$	(72	)	$	75,606
	2016		61,774			(75	)		61,699
	2017		32,751			(46	)		32,705
	2018		6,455			—			6,455
	2019		1,150			—			1,150
	Thereafter		1,785			—			1,785

	Total future minimum lease payments	$	179,593		$	(193	)	$	179,400

Future Minimum Lease Payments Under Technology License Obligations	'

	Fiscal Year:	Technology
		License
		Obligations
	2015	$	14,913
	2016		13,145
	2017		7,869
	2018		9,180
	2019		—
	Thereafter		—

	Total future minimum lease payments	$	45,107

	Less: amount representing interest		(2,027	)

	Present value of future minimum payments		43,080
	Less: current portion		(14,121	)

	Non-current portion	$	28,959

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
Shareholders' Equity (Tables)	Feb. 01, 2014
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	'
	The following table summarizes the activity under all of the option plans and other stock based arrangements (in thousands, except for per share amounts):


		Time-Based Options						Market-Based Options					Total
		Options			Weighted			Options			Weighted		Options			Weighted
		Outstanding			Average Exercise			Outstanding			Average Exercise		Outstanding			Average Exercise
					Price						Price					Price
	Balance at January 29, 2011		56,325		$	11.96			—			—		56,325		$	11.96
	Granted		3,477		$	15.31			3,149		$	15.43		6,626		$	15.37
	Exercised		(5,681	)	$	7.95			—			—		(5,681	)	$	7.95
	Canceled/Forfeited		(1,654	)	$	14.57			(25	)	$	15.43		(1,679	)	$	14.58
	Expired		—			—			—			—		—			—

	Balance at January 28, 2012		52,467		$	12.53			3,124		$	15.43		55,591		$	12.7
	Granted		7,041		$	14.59			—			—		7,041		$	14.59
	Exercised		(5,977	)	$	6.44			—			—		(5,977	)	$	6.44
	Canceled/Forfeited		(3,894	)	$	16.1			(365	)	$	15.43		(4,259	)	$	16.04
	Expired		—			—			—			—		—			—

	Balance at February 2, 2013		49,637		$	13.28			2,759		$	15.43		52,396		$	13.39
	Granted		18,922		$	10.82			—			—		18,922		$	10.82
	Exercised		(15,482	)	$	9.4			—			—		(15,482	)	$	9.4
	Canceled/Forfeited		(3,921	)	$	15.15			(136	)	$	15.43		(4,057	)	$	15.16
	Expired		—			—			—			—		—			—

	Balance at February 1, 2014		49,156		$	13.4			2,623		$	15.43		51,779		$	13.51

	Vested or expected to vest at February 1, 2014		45,913		$	13.55

	Exercisable at February 1, 2014		25,318		$	14.88

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


		Restricted Stock			Weighted Average
		Outstanding			Grant Date Fair
					Value
	Balance at January 29, 2011		5,486		$	18.75
	Granted		6,877		$	15.8
	Vested		(2,014	)	$	15.9
	Canceled/Forfeited		(703	)	$	16.81

	Balance at January 28, 2012		9,646		$	17.38
	Granted		7,370		$	14.64
	Vested		(2,796	)	$	17.78
	Canceled/Forfeited		(1,481	)	$	17.16

	Balance at February 2, 2013		12,739		$	15.78
	Granted		3,828		$	10.78
	Vested		(3,925	)	$	16.19
	Canceled/Forfeited		(1,288	)	$	14.39

	Balance at February 1, 2014		11,354		$	14.11

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):


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Cost of goods sold	$	8,863		$	8,142		$	6,995
	Research and development		109,432			87,149			85,924
	Selling and marketing		13,940			13,278			12,920
	General and administrative		23,638			18,711			14,024

		$	155,873		$	127,280		$	119,863

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 equity award on the date of grant using the Black-Scholes option pricing model and of each market-based equity award using a Monte Carlo simulation model:


		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Time-based Stock Options:
	Weighted average fair value	$	3.43		$	5.52		$	6.05
	Expected volatility		45	%		44	%		44	%
	Expected term (in years)		5			4.8			4.8
	Risk-free interest rate		0.8	%		0.9	%		2	%
	Expected dividend yield		2.4	%		0.3	%		—
Market Based Option Award	'
Weighted Average Assumptions Used to Calculate Fair Value Awards	'

		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Market-based Stock Options:
	Weighted average fair value	$	—		$	—		$	5.08
	Expected volatility		—	%		—	%		42	%
	Risk-free interest rate		—	%		—	%		0.9 - 3.6	%
Employee Stock	'
Weighted Average Assumptions Used to Calculate Fair Value Awards	'

		Year Ended
		February 1,			February 2,			January 28,
		2014			2013			2012
	Employee Stock Purchase Plan:
	Estimated fair value	$	3.65		$	3.13		$	4.63
	Expected volatility		37	%		40	%		44	%
	Expected term (in years)		1.3			1.2			1.1
	Risk-free interest rate		0.2	%		0.2	%		0.1	%
	Expected dividend yield		2	%		2.4	%		—

Segment_and_Geographic_Informa1

Segment and Geographic Information (Tables)	12 Months Ended
Segment and Geographic Information (Tables)	Feb. 01, 2014
Net Revenue and Long-Lived Asset Information based on Geographic Region	'
	The following tables present net revenue and long-lived asset information based on geographic region. Net revenue is based on the destination of the shipments and long-lived assets are based on the physical location of the assets (in thousands):


		Year Ended
	Net Revenue:	February 1,		February 2,		January 28,
	Net Revenue:	2014		2013		2012
	United States	$	68,321	$	176,581	$	194,638
	China		1,869,381		1,599,681		1,496,864
	Thailand		353,363		369,855		531,073
	Malaysia		352,756		351,401		420,382
	Philippines		257,899		246,269		207,450
	Others		502,680		424,843		542,633

		$	3,404,400	$	3,168,630	$	3,393,040



	Property and equipment, net:	February 1,		February 2,
	Property and equipment, net:	2014		2013
	Bermuda	$	4,453	$	5,691
	China		29,146		27,724
	Israel		33,758		36,671
	Singapore		76,367		78,047
	United States		195,253		208,459
	Others		17,188		16,379

		$	356,165	$	372,971

Net Revenue by End Market	'
	The following table presents net revenue by end market (in thousands):


		Year Ended
	Net Revenue by End Market	February 1,		February 2,		January 28,
	Net Revenue by End Market	2014		2013		2012
	Storage	$	1,681,953	$	1,494,959	$	1,560,772
	Mobile and Wireless		839,407		822,533		968,706
	Networking		670,249		708,821		697,865
	Other		212,791		142,317		165,697

		$	3,404,400	$	3,168,630	$	3,393,040

Supplementary_Data_Unaudited_T

Supplementary Data (Unaudited) (Tables)	12 Months Ended
Supplementary Data (Unaudited) (Tables)	Feb. 01, 2014
Schedule of Quarterly Financial Information	'
	The following table presents the unaudited consolidated statements of operations data for each of the eight quarters in the period ended February 1, 2014. In management’s opinion, this information has been presented on the same basis as the audited consolidated financial statements included in a separate section of this Annual Report on Form 10-K, and all necessary adjustments, consisting only of normal recurring adjustments, have been included in the amounts below to fairly state the unaudited quarterly results when read in conjunction with the audited consolidated financial statements and related notes. The operating results for any period should not be considered indicative of results to be expected in any future period. The Company expects the quarterly operating results to fluctuate in future periods due to a variety of reasons, including those discussed in Part I, Item 1A “Risk Factors.”


			Fiscal 2014
			First		Second		Third		Fourth
			Quarter		Quarter (1)		Quarter (2)		Quarter (3)
			(In thousands, except per share amounts)
	Net revenue		$	734,369	$	807,056	$	931,226	$	931,749
	Gross profit		$	398,931	$	420,997	$	466,245	$	454,497
	Net income		$	53,209	$	61,826	$	103,156	$	97,129
	Net income per share:
	Basic		$	0.11	$	0.13	$	0.21	$	0.2
	Diluted		$	0.11	$	0.12	$	0.21	$	0.19


			Fiscal 2013
			First		Second		Third		Fourth
			Quarter (4)		Quarter (5)		Quarter		Quarter (6)
			(In thousands, except per share amounts)
	Net revenue		$	796,351	$	816,104	$	780,881	$	775,294
	Gross profit		$	430,029	$	434,265	$	406,378	$	404,461
	Net income		$	94,543	$	93,074	$	68,816	$	50,152
	Net income per share:
	Basic		$	0.16	$	0.17	$	0.12	$	0.1
	Diluted		$	0.16	$	0.16	$	0.12	$	0.09

	-1	The second quarter of fiscal 2014 includes $5.2 million for litigation settlements that do not relate to the litigation with Carnegie Mellon University.
	-2	The third quarter of fiscal 2014 includes $4.2 million of restructuring and other exit-related costs.
	-3	The fourth quarter of fiscal 2014 includes $9.5 million for anticipated litigation settlements that do not relate to the litigation with Carnegie Mellon University, a $7.0 million gain from the sale of a business and $8.1 million charge for the impairment of an intangible asset.
	-4	The first quarter of fiscal 2013 includes $2.5 million for expenses related to acquisitions in prior fiscal years.
	-5	The second quarter of fiscal 2013 includes $1.6 million for expenses related to acquisitions in prior fiscal years.
	-6	The fourth quarter of fiscal 2013 includes $5.7 million for an expense related to an ongoing litigation that did not relate to the litigation with Carnegie Mellon University.

Recovered_Sheet1

The Company and Its Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
	Entity	Entity	Entity
Significant Accounting Policies [Line Items]	'	'	'
Write down of equity investments that were considered to be impaired	$1.50	'	'
Allowance for doubtful accounts	$1.30	$1	'
Number of distributors with more than 10% revenue	0	1	1
Inventory turnover period, minimum (in days)	'60 days	'	'
Inventory turnover period, maximum (in days)	'90 days	'	'
Minimum likelihood that uncertain tax position will be sustained as a result of examination by income tax audits	50.00%	'	'
Standard Product Warranty Time Period	'90 days	'	'
Annual Grant	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Share-based compensation, vest term (in years)	'4 years	'	'
New Hire	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Share-based compensation, vest term (in years)	'5 years	'	'
Typical Cases	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Standard Product Warranty Time Period	'90 days	'	'
Non-Typical Cases \| Minimum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Standard Product Warranty Time Period	'1 year	'	'
Buildings	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Property and equipment, estimated useful lives (in years)	'30 years	'	'
Building Improvements	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Property and equipment, estimated useful lives (in years)	'15 years	'	'
Machinery and Equipment \| Minimum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Property and equipment, estimated useful lives (in years)	'3 years	'	'
Machinery and Equipment \| Maximum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Property and equipment, estimated useful lives (in years)	'7 years	'	'
Computer Software, Intangible Asset \| Minimum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Property and equipment, estimated useful lives (in years)	'3 years	'	'
Computer Software, Intangible Asset \| Maximum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Property and equipment, estimated useful lives (in years)	'7 years	'	'
Furniture and Fixtures \| Minimum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Property and equipment, estimated useful lives (in years)	'3 years	'	'
Furniture and Fixtures \| Maximum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Property and equipment, estimated useful lives (in years)	'7 years	'	'
Credit Concentration Risk \| Accounts Receivable	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Number of major customers	1	2	'
Concentration of risk percentage	13.00%	'	'
Credit Concentration Risk \| Accounts Receivable \| Customer A	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Concentration of risk percentage	'	19.00%	'
Credit Concentration Risk \| Accounts Receivable \| Customer B	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Concentration of risk percentage	'	15.00%	'
Customer Concentration Risk \| Net Revenue	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Number of major customers	2	3	1
Concentration of risk percentage	36.00%	44.00%	19.00%
Short-term Investments \| Minimum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Maturity period to classify investments	'90 days	'	'
Short-term Investments \| Maximum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Maturity period to classify investments	'1 year	'	'

Acquisitions_and_Divestitures_1

Acquisitions and Divestitures - Additional Information (Detail) (USD $)	12 Months Ended			12 Months Ended	0 Months Ended	3 Months Ended				1 Months Ended
	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Feb. 01, 2014	Dec. 31, 2011	Jan. 28, 2012	Dec. 31, 2011	Dec. 31, 2011	Feb. 01, 2014	Apr. 30, 2011
				Discontinued Operation Or Asset Disposals	Xelerated Ab	Xelerated Ab	Xelerated Ab	Xelerated Ab	Xelerated Ab	Ethernet physical-layer transceivers ("PHY")
						Retention bonuses	Purchased technology	Trade names	Maximum
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'
Business acquisition purchase price, cash	'	'	'	'	$75,200,000	'	'	'	'	$16,300,000
Business acquisition purchase price allocation, goodwill	2,029,945,000	2,032,138,000	2,031,991,000	'	22,324,000	'	'	'	'	1,600,000
Business acquisition, additional contingent consideration	'	'	'	'	'	4,300,000	'	'	5,000,000	'
Business acquisition, additional contingent consideration, payable term	'	'	'	'	'	'2 years	'	'	'	'
Fair value of acquired intangible assets	'	'	'	'	51,800,000	'	25,800,000	1,300,000	'	'
Business acquisition purchase price allocation, tangible assets	'	'	'	'	9,440,000	'	'	'	'	1,100,000
Business acquisition purchase price allocation, intangible assets	'	'	'	'	51,800,000	'	'	'	'	13,600,000
Intellectual property and equipment	'	'	'	100,000	'	'	'	'	'	'
Goodwill written off	2,593,000	'	'	2,600,000	'	'	'	'	'	'
Gain (Loss) on sale of business	$6,975,000	'	'	$6,975,000	'	'	'	'	'	'

Purchase_Price_Consideration_o

Purchase Price Consideration of Xelerated (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Xelerated Ab
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]	'	'	'	'
Accounts receivable	'	'	'	$2,407
Inventory	'	'	'	6,481
Prepaid and other current assets	'	'	'	111
Property and equipment	'	'	'	441
Tangible assets acquired	'	'	'	9,440
Goodwill	2,029,945	2,032,138	2,031,991	22,324
Intangible assets	'	'	'	51,800
Total assets acquired	'	'	'	83,564
Accounts payable	'	'	'	-256
Accrued liabilities	'	'	'	-7,152
Deferred tax liability	'	'	'	-1,000
Net assets acquired	'	'	'	$75,156

Recognized_Acquired_Intangible

Recognized Acquired Intangible Assets for Xelerated Based Upon Fair Value as of Acquisition Date (Detail) (USD $)	12 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2011
	Trade names	Xelerated Ab	Xelerated Ab	Xelerated Ab	Xelerated Ab
			Purchased technology	Customer intangible	Trade names
Business Acquisition [Line Items]	'	'	'	'	'
Fair value	'	$51,800	$25,800	$24,700	$1,300
Estimated useful lives	'5 years	'	'6 years	'5 years	'5 years

Summary_of_Investments_Detail

Summary of Investments (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	$1,020,271	$1,183,745
Gross Unrealized Gains	3,062	3,194
Gross Unrealized Losses	-3,399	-3,133
Estimated Fair Value	1,019,934	1,183,806
Short-term Investments	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	1,001,121	1,164,295
Gross Unrealized Gains	3,062	3,194
Gross Unrealized Losses	-528	-452
Estimated Fair Value	1,003,655	1,167,037
Short-term Investments \| Corporate debt securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	587,095	577,120
Gross Unrealized Gains	2,789	2,886
Gross Unrealized Losses	-370	-382
Estimated Fair Value	589,514	579,624
Short-term Investments \| U.S. government and agency debt	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	301,423	318,226
Gross Unrealized Gains	128	258
Gross Unrealized Losses	-72	-5
Estimated Fair Value	301,479	318,479
Short-term Investments \| Time Deposits	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	'	188,000
Estimated Fair Value	'	188,000
Short-term Investments \| Asset-backed Securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	76,220	76,629
Gross Unrealized Gains	89	50
Gross Unrealized Losses	-38	-64
Estimated Fair Value	76,271	76,615
Short-term Investments \| Foreign government and agency debt	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	20,324	4,320
Gross Unrealized Gains	12	'
Gross Unrealized Losses	-44	-1
Estimated Fair Value	20,292	4,319
Short-term Investments \| Municipal debt securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	16,059	'
Gross Unrealized Gains	44	'
Gross Unrealized Losses	-4	'
Estimated Fair Value	16,099	'
Long-term investments	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	19,150	19,450
Gross Unrealized Losses	-2,871	-2,681
Estimated Fair Value	16,279	16,769
Long-term investments \| Auction rate securities	'	'
Gain (Loss) on Investments [Line Items]	'	'
Amortized Cost	19,150	19,450
Gross Unrealized Losses	-2,871	-2,681
Estimated Fair Value	$16,279	$16,769

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	12 Months Ended
Investments - Additional Information (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Gain (Loss) on Investments [Line Items]	'	'	'
Amortized Cost	$1,020,271,000	$1,183,745,000	'
Gross Unrealized Losses	3,399,000	3,133,000	'
Cash, cash equivalents and short-term investments	2,000,000,000	'	'
Available-for-sale securities, gross realized gain	1,600,000	3,600,000	2,400,000
Available-for-sale securities, gross realized loss	300,000	300,000	1,000,000
Long-term investments	'	'	'
Gain (Loss) on Investments [Line Items]	'	'	'
Amortized Cost	19,150,000	19,450,000	'
Gross Unrealized Losses	2,871,000	2,681,000	'
Long-term investments \| Auction rate securities	'	'	'
Gain (Loss) on Investments [Line Items]	'	'	'
Amortized Cost	19,150,000	19,450,000	'
Gross Unrealized Losses	$2,871,000	$2,681,000	'

Contractual_Maturities_of_Avai

Contractual Maturities of Available for Sale Securities (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Amortized Cost	'	'
Due in one year or less	$309,543	$519,006
Due between one and five years	686,062	627,769
Due over five years	24,666	36,970
Amortized Cost	1,020,271	1,183,745
Estimated Fair Value	'	'
Due in one year or less	309,861	519,537
Due between one and five years	688,280	629,991
Due over five years	21,793	34,278
Estimated Fair Value	$1,019,934	$1,183,806

Summary_of_Investments_Gross_U

Summary of Investments Gross Unrealized Losses and Fair Value (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	$237,908	$204,793
Less than 12 months Unrealized Losses	-505	-452
12 months or more Fair Value	20,296	16,769
12 months or more Unrealized Losses	-2,894	-2,681
Total Fair Value	258,204	221,562
Total Unrealized Losses	-3,399	-3,133
Corporate debt securities	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	110,903	141,915
Less than 12 months Unrealized Losses	-366	-382
12 months or more Fair Value	2,105	'
12 months or more Unrealized Losses	-4	'
Total Fair Value	113,008	141,915
Total Unrealized Losses	-370	-382
Asset-backed Securities	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	18,865	43,882
Less than 12 months Unrealized Losses	-19	-64
12 months or more Fair Value	1,912	'
12 months or more Unrealized Losses	-19	'
Total Fair Value	20,777	43,882
Total Unrealized Losses	-38	-64
U.S. government and agency debt	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	93,118	14,677
Less than 12 months Unrealized Losses	-72	-5
Total Fair Value	93,118	14,677
Total Unrealized Losses	-72	-5
Foreign government and agency debt	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	14,299	4,319
Less than 12 months Unrealized Losses	-44	-1
Total Fair Value	14,299	4,319
Total Unrealized Losses	-44	-1
Municipal debt securities	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
Less than 12 months Fair Value	723	'
Less than 12 months Unrealized Losses	-4	'
Total Fair Value	723	'
Total Unrealized Losses	-4	'
Auction rate securities	'	'
Investments, Unrealized Loss Position [Line Items]	'	'
12 months or more Fair Value	16,279	16,769
12 months or more Unrealized Losses	-2,871	-2,681
Total Fair Value	16,279	16,769
Total Unrealized Losses	($2,871)	($2,681)

Cash_and_Cash_Equivalents_Deta

Cash and Cash Equivalents (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011
Cash, cash equivalents and marketable securities [Line Items]	'	'	'	'
Cash	$694,789	$583,527	'	'
Cash equivalents:	'	'	'	'
Time deposits	247,958	119,874	'	'
U.S. government and agency debt	11,999	27,029	'	'
Municipal debt securities	4,800	'	'	'
Corporate debt securities	3,400	'	'	'
Money market funds	2,804	21,523	'	'
Cash and cash equivalents	$965,750	$751,953	$784,902	$1,847,074

Inventories_Detail

Inventories (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Inventory [Line Items]	'	'
Work-in-process	$195,495	$140,805
Finished goods	152,366	109,615
Inventories	$347,861	$250,420

Property_and_Equipment_Net_Det

Property and Equipment Net (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Property, Plant and Equipment [Line Items]	'	'
Machinery and equipment	$562,038	$532,420
Buildings	144,320	144,320
Computer software	96,096	89,548
Land	53,373	53,373
Building improvements	49,645	49,516
Leasehold improvements	49,060	46,205
Furniture and fixtures	27,621	25,301
Construction in progress	2,911	5,333
Property, Plant and Equipment, Gross, Total	985,064	946,016
Less: Accumulated depreciation	-628,899	-573,045
Property and equipment, net	$356,165	$372,971

Supplemental_Financial_Informa2

Supplemental Financial Information - Additional Information (Detail) (USD $)	12 Months Ended
Share data in Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Computation Of Earnings Per Share Line Items	'	'	'
Depreciation expense	$77,200,000	$70,700,000	$63,500,000
Amortization expense	43,925,000	52,700,000	49,357,000
Market Based Option Award	'	'	'
Computation Of Earnings Per Share Line Items	'	'	'
Anti-dilutive options excluded from the computation of diluted net income per share	2,700	3,000	3,000
Technology and Other Licenses	'	'	'
Computation Of Earnings Per Share Line Items	'	'	'
Amortization expense	$25,600,000	$20,300,000	$24,900,000

Other_Non_Current_Assets_Detai

Other Non Current Assets (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]	'	'
Technology and other licenses	$83,521	$81,523
Deferred tax assets	19,282	26,291
Investments in privately-held companies	14,565	14,486
Prepaid land use rights	13,744	14,056
Deposits	12,433	10,451
Other	16,821	18,078
Other non-current assets	$160,366	$164,885

Accrued_Liabilities_Detail

Accrued Liabilities (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Schedule of Accrued Liabilities [Line Items]	'	'
Accrued rebates	$61,616	$51,712
Accrued royalties	36,568	16,298
Technology license obligations	18,482	9,865
Accrued legal expense	14,589	14,754
Accrued share repurchases	'	22,152
Other	30,507	29,210
Accrued liabilities	$161,762	$143,991

Other_Long_Term_Liabilities_De

Other Long Term Liabilities (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Schedule of Other Liabilities [Line Items]	'	'
Technology license obligations	$28,959	$34,270
Long-term accrued employee compensation	4,370	6,205
Other	9,140	15,935
Other non-current liabilities	$42,469	$56,410

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive (Loss) Income by Component (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Beginning Balance	$1,148	$776	'
Other comprehensive income (loss) before reclassifications	4,207	978	'
Amounts reclassified from accumulated other comprehensive income	-4,758	-606	'
Net current-period other comprehensive income (loss)	-551	372	-316
Ending Balance	597	1,148	776
Unrealized Gain (Loss) on Marketable Securities	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Beginning Balance	2,742	3,702	'
Other comprehensive income (loss) before reclassifications	931	2,141	'
Amounts reclassified from accumulated other comprehensive income	-1,139	-3,101	'
Net current-period other comprehensive income (loss)	-208	-960	'
Ending Balance	2,534	2,742	'
Auction rate securities	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Beginning Balance	-2,681	-1,285	'
Other comprehensive income (loss) before reclassifications	-190	-1,396	'
Net current-period other comprehensive income (loss)	-190	-1,396	'
Ending Balance	-2,871	-2,681	'
Unrealized Gain (Loss) on Cash Flow Hedges	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Beginning Balance	1,087	-1,641	'
Other comprehensive income (loss) before reclassifications	3,466	233	'
Amounts reclassified from accumulated other comprehensive income	-3,619	2,495	'
Net current-period other comprehensive income (loss)	-153	2,728	'
Ending Balance	$934	$1,087	'

Amounts_Reclassified_from_Accu

Amounts Reclassified from Accumulated Other Comprehensive Income by Components (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Feb. 01, 2014

Nov. 02, 2013

Aug. 03, 2013

4-May-13

Feb. 02, 2013

Oct. 27, 2012

Jul. 28, 2012

Apr. 28, 2012

Feb. 01, 2014

Feb. 02, 2013

Jan. 28, 2012

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Interest and other income, net

$25,566

$15,533

$14,913

Cost of goods sold

-1,663,730

-1,493,497

-1,465,805

Research and development

-1,156,885

-1,057,445

-1,013,678

Selling and marketing

-152,698

-161,817

-159,434

General and administrative

-106,471

-108,514

-100,620

Total

97,129

[1]

103,156

[2]

61,826

[3]

53,209

50,152

[4]

68,816

93,074

[5]

94,543

[6]

315,320

306,585

615,091

Reclassification out of Accumulated Other Comprehensive Income

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Total

4,758

Unrealized Gain (Loss) on Marketable Securities | Reclassification out of Accumulated Other Comprehensive Income

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Interest and other income, net

1,139

Unrealized Gain (Loss) on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of goods sold

200

Research and development

3,129

Selling and marketing

266

General and administrative

$24

[1]

The fourth quarter of fiscal 2014 includes $9.5 million for anticipated litigation settlements that do not relate to the litigation with Carnegie Mellon University, a $7.0 million gain from the sale of a business and $8.1 million charge for the impairment of an intangible asset.

[2]

The third quarter of fiscal 2014 includes $4.2 million of restructuring and other exit-related costs.

[3]

The second quarter of fiscal 2014 includes $5.2 million for litigation settlements that do not relate to the litigation with Carnegie Mellon University.

[4]

The fourth quarter of fiscal 2013 includes $5.7 million for an expense related to an ongoing litigation that did not relate to the litigation with Carnegie Mellon University.

[5]

The second quarter of fiscal 2013 includes $1.6 million for expenses related to acquisitions in prior fiscal years.

[6]

The first quarter of fiscal 2013 includes $2.5 million for expenses related to acquisitions in prior fiscal years.

Computations_of_Basic_and_Dilu

Computations of Basic and Diluted Net Income Per Share (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Feb. 01, 2014

Nov. 02, 2013

Aug. 03, 2013

4-May-13

Feb. 02, 2013

Oct. 27, 2012

Jul. 28, 2012

Apr. 28, 2012

Feb. 01, 2014

Feb. 02, 2013

Jan. 28, 2012

Numerator:

Net income

$97,129

[1]

$103,156

[2]

$61,826

[3]

$53,209

$50,152

[4]

$68,816

$93,074

[5]

$94,543

[6]

$315,320

$306,585

$615,091

Denominator:

Weighted average shares - basic

496,518

555,310

607,857

Effect of dilutive securities:

Share-based awards

7,895

7,813

15,411

Weighted average shares - diluted

504,413

563,123

623,268

Basic

$0.20

[1]

$0.21

[2]

$0.13

[3]

$0.11

$0.10

[4]

$0.12

$0.17

[5]

$0.16

[6]

$0.64

$0.55

$1.01

Diluted

$0.19

[1]

$0.21

[2]

$0.12

[3]

$0.11

$0.09

[4]

$0.12

$0.16

[5]

$0.16

[6]

$0.63

$0.54

$0.99

Stock Options

Effect of dilutive securities:

Weighted average shares outstanding from stock options

39,593

28,124

21,014

Weighted average exercise price:

$15.14

$17.48

$18.79

[1]

[2]

The third quarter of fiscal 2014 includes $4.2 million of restructuring and other exit-related costs.

[3]

The second quarter of fiscal 2014 includes $5.2 million for litigation settlements that do not relate to the litigation with Carnegie Mellon University.

[4]

The fourth quarter of fiscal 2013 includes $5.7 million for an expense related to an ongoing litigation that did not relate to the litigation with Carnegie Mellon University.

[5]

The second quarter of fiscal 2013 includes $1.6 million for expenses related to acquisitions in prior fiscal years.

[6]

The first quarter of fiscal 2013 includes $2.5 million for expenses related to acquisitions in prior fiscal years.

Notional_Amounts_of_Outstandin

Notional Amounts of Outstanding Foreign Currency Forward Contracts (Detail) (Foreign Exchange Contract, USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Derivative [Line Items]	'	'
Buy Contracts	$49,097	$38,249
Israeli shekel	'	'
Derivative [Line Items]	'	'
Buy Contracts	39,670	38,249
Euro	'	'
Derivative [Line Items]	'	'
Buy Contracts	5,718	'
Swedish krona	'	'
Derivative [Line Items]	'	'
Buy Contracts	$3,709	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail)	Feb. 01, 2014
Fair Value, Measurement Inputs, Disclosure [Line Items]	'
Percentage of total amount of assets measured using Level 3 valuation methodologies to total assets	0.30%

Financial_Assets_that_were_Acc

Financial Assets that were Accounted for at Fair Value (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Assets	'	'
Total assets	$1,294,100	$1,355,353
Cash equivalents \| Money market funds	'	'
Assets	'	'
Cash equivalents	2,804	21,523
Cash equivalents \| Time deposits	'	'
Assets	'	'
Cash equivalents	247,958	119,874
Cash equivalents \| Municipal debt securities	'	'
Assets	'	'
Cash equivalents	4,800	'
Cash equivalents \| U.S. government and agency debt	'	'
Assets	'	'
Cash equivalents	11,999	27,029
Cash equivalents \| Corporate debt securities	'	'
Assets	'	'
Cash equivalents	3,400	'
Short-term Investments \| Time deposits	'	'
Assets	'	'
Investments	'	188,000
Short-term Investments \| Municipal debt securities	'	'
Assets	'	'
Investments	16,099	'
Short-term Investments \| U.S. government and agency debt	'	'
Assets	'	'
Investments	301,479	318,479
Short-term Investments \| Corporate debt securities	'	'
Assets	'	'
Investments	589,514	579,624
Short-term Investments \| Asset-backed Securities	'	'
Assets	'	'
Investments	76,271	76,615
Short-term Investments \| Foreign government and agency debt	'	'
Assets	'	'
Investments	20,292	4,319
Prepaid expenses and other current assets \| Foreign currency forward contracts	'	'
Assets	'	'
Prepaid expenses and other current assets	1,012	1,144
Long-term investments \| Auction rate securities	'	'
Assets	'	'
Investments	16,279	16,769
Other non-current assets \| Severance Pay Fund	'	'
Assets	'	'
Other non-current asset	2,193	1,977
Accrued Liabilities \| Foreign currency forward contracts	'	'
Liabilities	'	'
Accrued liabilities	26	'
Level 1	'	'
Assets	'	'
Total assets	316,282	367,031
Level 1 \| Cash equivalents \| Money market funds	'	'
Assets	'	'
Cash equivalents	2,804	21,523
Level 1 \| Cash equivalents \| U.S. government and agency debt	'	'
Assets	'	'
Cash equivalents	11,999	27,029
Level 1 \| Short-term Investments \| U.S. government and agency debt	'	'
Assets	'	'
Investments	301,479	318,479
Level 2	'	'
Assets	'	'
Total assets	961,539	971,553
Level 2 \| Cash equivalents \| Time deposits	'	'
Assets	'	'
Cash equivalents	247,958	119,874
Level 2 \| Cash equivalents \| Municipal debt securities	'	'
Assets	'	'
Cash equivalents	4,800	'
Level 2 \| Cash equivalents \| Corporate debt securities	'	'
Assets	'	'
Cash equivalents	3,400	'
Level 2 \| Short-term Investments \| Time deposits	'	'
Assets	'	'
Investments	'	188,000
Level 2 \| Short-term Investments \| Municipal debt securities	'	'
Assets	'	'
Investments	16,099	'
Level 2 \| Short-term Investments \| Corporate debt securities	'	'
Assets	'	'
Investments	589,514	579,624
Level 2 \| Short-term Investments \| Asset-backed Securities	'	'
Assets	'	'
Investments	76,271	76,615
Level 2 \| Short-term Investments \| Foreign government and agency debt	'	'
Assets	'	'
Investments	20,292	4,319
Level 2 \| Prepaid expenses and other current assets \| Foreign currency forward contracts	'	'
Assets	'	'
Prepaid expenses and other current assets	1,012	1,144
Level 2 \| Other non-current assets \| Severance Pay Fund	'	'
Assets	'	'
Other non-current asset	2,193	1,977
Level 2 \| Accrued Liabilities \| Foreign currency forward contracts	'	'
Liabilities	'	'
Accrued liabilities	26	'
Level 3	'	'
Assets	'	'
Total assets	16,279	16,769
Level 3 \| Long-term investments \| Auction rate securities	'	'
Assets	'	'
Investments	$16,279	$16,769

Summary_of_Change_in_Fair_Valu

Summary of Change in Fair Values for Level Three Items (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Beginning balance	$16,769	$23,215
Sales, redemption and settlement	-300	-5,050
Unrealized loss included in accumulated other comprehensive income	-190	-1,396
Ending balance	$16,279	$16,769

Carrying_Value_of_Goodwill_Det

Carrying Value of Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Goodwill [Line Items]	'	'
Beginning balance	$2,032,138	$2,031,991
Additions due to business combinations	400	147
Sale of a business	-2,593	'
Ending balance	$2,029,945	$2,032,138

Acquired_Intangible_Assets_Net

Acquired Intangible Assets Net (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014		Feb. 02, 2013
Acquired Finite-Lived Intangible Assets [Line Items]	'		'
Gross Carrying Amounts	$84,876		$293,740
Accumulated Amortization and Write-Offs	-35,841		-204,085
Net Carrying Amount	49,035		89,655
Purchased technology	'		'
Acquired Finite-Lived Intangible Assets [Line Items]	'		'
Gross Carrying Amounts	49,240		54,690
Accumulated Amortization and Write-Offs	-20,634		-18,552
Net Carrying Amount	28,606		36,138
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	'7 years		'
Core technology	'		'
Acquired Finite-Lived Intangible Assets [Line Items]	'		'
Gross Carrying Amounts	2,350		138,650
Accumulated Amortization and Write-Offs	-1,583		-123,298
Net Carrying Amount	767		15,352
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	1,300		1,300
Accumulated Amortization and Write-Offs	-568		-308
Net Carrying Amount	732		992
Customer intangibles	'		'
Acquired Finite-Lived Intangible Assets [Line Items]	'		'
Gross Carrying Amounts	28,600		89,400
Accumulated Amortization and Write-Offs	-13,056		-61,927
Net Carrying Amount	15,544		27,473
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	'7 years		'
In-process research and development	'		'
Acquired Finite-Lived Intangible Assets [Line Items]	'		'
Useful Lives	'	[1]	'
Gross Carrying Amounts	3,386		9,700
Net Carrying Amount	$3,386		$9,700

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

Goodwill_and_Acquired_Intangib2

Goodwill and Acquired Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Feb. 01, 2014	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Goodwill and Intangible Assets Disclosure [Line Items]	'	'	'	'
Write off of acquisition related intangible assets	$8.10	$8.10	'	$0
Write off of acquired IPR&D	'	'	$0.80	'

Future_Amortization_Expense_of

Future Amortization Expense of Identified Intangibles (Detail) (In Process Research and Development Excluded, USD $)	Feb. 01, 2014
In Thousands, unless otherwise specified	Feb. 01, 2014
In Process Research and Development Excluded	'
Fiscal Year	'
2015	$14,951
2016	12,212
2017	11,027
2018	5,599
2019	1,860
Thereafter	'
Finite-Lived Intangible Assets, Net, Total	$45,649

Restructuring_Additional_Infor

Restructuring - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Nov. 02, 2013	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
	Nov. 02, 2013	Facility	Feb. 02, 2013	Jan. 28, 2012
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	$4,200,000	$4,732,000	$1,257,000	$1,856,000
Other exit related costs	'	4,671,000	553,000	'
Proceeds from sale of building held for sale	'	'	'	6,800,000
Number of facilities	'	2	'	'
Payment Terms Period One	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Year of expected payments under lease obligations	'	'2015	'	'
Payment Terms Period Two	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Year of expected payments under lease obligations	'	'2018	'	'
Facility closures	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	'	4,200,000	'	'
Severance expenses	'	2,800,000	'	'
Other exit related costs	'	$1,400,000	'	'

Restructuring_Charges_Detail

Restructuring Charges (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Nov. 02, 2013	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	$4,200	$4,732	$1,257	$1,856
Research and development	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	'	2,886	47	728
Selling and marketing	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	'	795	-3	8
General and administrative	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges	'	$1,051	$1,213	$1,120

Reconciliation_of_Beginning_an

Reconciliation of Beginning and Ending Restructuring Liability Balances by Major Type of Costs (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring liabilities, beginning of balance	$2,855	$2,917
Restructuring charges	4,671	553
Net cash payments	-5,073	-1,329
Non-cash adjustments	'	10
Adjustments to previous estimates	'	704
Restructuring liabilities, ending balance	2,453	2,855
Severance and Related Costs	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring charges	2,786	'
Net cash payments	-2,735	'
Restructuring liabilities, ending balance	51	'
Facilities and Related Costs	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring liabilities, beginning of balance	2,855	2,917
Restructuring charges	1,672	553
Net cash payments	-2,144	-1,329
Non-cash adjustments	'	10
Adjustments to previous estimates	'	704
Restructuring liabilities, ending balance	2,383	2,855
Other Exit-Related Costs	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring charges	213	'
Net cash payments	-194	'
Restructuring liabilities, ending balance	$19	'

US_and_NonUS_Components_of_Inc

U.S. and Non-U.S. Components of Income Before Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]	'	'	'
U.S. operations	$31,339	$34,900	$28,039
Non-U.S. operations	274,918	275,290	591,020
Income before income taxes	$306,257	$310,190	$619,059

Provision_for_Income_Taxes_Det

Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Current income tax provision (benefit):	'	'	'
Federal	$5,774	$4,461	$8,183
State	73	407	99
Foreign	-18,829	-8,289	-1,069
Total current income tax provision (benefit)	-12,982	-3,421	7,213
Deferred income tax provision (benefit):	'	'	'
Federal	317	6,306	-1,361
State	32	90	1,078
Foreign	3,570	630	-2,962
Total deferred income tax provision (benefit)	3,919	7,026	-3,245
Total provision (benefit) for income taxes	($9,063)	$3,605	$3,968

Deferred_Tax_Assets_Detail

Deferred Tax Assets (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Deferred tax assets:	'	'
Federal and California research and other tax credits	$335,894	$299,475
Reserves and accruals	25,833	27,830
Share-based compensation	4,067	3,523
Net operating losses	18,470	20,553
Gross deferred tax assets	384,264	351,381
Valuation allowance	-335,890	-299,449
Total deferred tax assets	48,374	51,932
Total deferred tax liabilities	-17,586	-17,225
Net deferred tax assets	$30,788	$34,707

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Income Taxes [Line Items]	'	'	'
Deferred tax assets, non-current	$19,282,000	$26,291,000	'
Increase (decrease) in net deferred tax	'	3,900,000	'
Unrecognized tax benefit that would affect the effective income tax rate if recognized	43,200,000	'	'
Unrecognized tax benefit, interest and penalties accrued	29,600,000	33,800,000	35,300,000
Interest and penalties related to unrecognized tax benefits included in consolidated statements of operation	6,200,000	5,800,000	5,900,000
Uncertain tax positions decrease from the lapse of the statutes of limitation in various jurisdictions during the next 12 months	-20,000,000	'	'
Corporate income tax rate, foreign	-55.80%	-48.80%	-40.70%
Foreign Country	'	'	'
Income Taxes [Line Items]	'	'	'
Net operating loss carryforwards	68,900,000	'	'
Net operating loss carryforwards, expiration date	'The losses in non-U.S. companies can be carried forward indefinitely	'	'
Internal Revenue Service (IRS)	'	'	'
Income Taxes [Line Items]	'	'	'
Net operating loss carryforwards	1,900,000	'	'
Net operating loss carryforwards, expiration date	'The federal carryforwards will expire in various fiscal years between 2021 and 2027	'	'
California	'	'	'
Income Taxes [Line Items]	'	'	'
Net operating loss carryforwards	7,300,000	'	'
Net operating loss carryforwards, expiration date	'The California carryforwards will expire at various fiscal years between 2016 and 2033, if not utilized before these years.	'	'
Economic Development Board of Singapore Pioneer Status	'	'	'
Income Taxes [Line Items]	'	'	'
Expiration of tax exemption	'10 years	'	'
Tax exemption renewal period	'5 years	'	'
Tax holidays, tax savings amount	3,700,000	13,600,000	3,100,000
Tax holidays, per share effect on earnings	$0.01	$0.02	$0.01
Corporate income tax rate, foreign	17.00%	'	'
Economic Development Board of Singapore Pioneer Status \| Extended Expiration	'	'	'
Income Taxes [Line Items]	'	'	'
Expiration of tax exemption	'15 years	'	'
Economic Development Board of Singapore Pioneer Status \| Development and Expansion Incentive	'	'	'
Income Taxes [Line Items]	'	'	'
Expiration of tax exemption	'40 years	'	'
Israeli Law of Approved or Benefited Enterprise	'	'	'
Income Taxes [Line Items]	'	'	'
Tax holidays, tax savings amount	2,200,000	13,800,000	13,600,000
Tax holidays, per share effect on earnings	$0.01	$0.02	$0.02
Israeli Law of Approved or Benefited Enterprise \| Minimum	'	'	'
Income Taxes [Line Items]	'	'	'
Expiration of tax exemption	'10 years	'	'
Tax holidays, reduced income tax rate	0.00%	'	'
Israeli Law of Approved or Benefited Enterprise \| Maximum	'	'	'
Income Taxes [Line Items]	'	'	'
Expiration of tax exemption	'15 years	'	'
Tax holidays, reduced income tax rate	10.00%	'	'
Swiss Federal Department of Economy and the Vaud Cantonal Tax Administration Tax Holiday	'	'	'
Income Taxes [Line Items]	'	'	'
Expiration of tax exemption	'10 years	'	'
Tax holidays, tax savings amount	5,100,000	4,600,000	4,700,000
Swiss Federal Department of Economy and the Vaud Cantonal Tax Administration Tax Holiday \| Maximum	'	'	'
Income Taxes [Line Items]	'	'	'
Tax holidays, per share effect on earnings	$0.01	$0.01	$0.01
Research	'	'	'
Income Taxes [Line Items]	'	'	'
Tax credit carryforwards	335,900,000	'	'
Valuation allowance commentary	'At the end of fiscal 2014, the Company has provided a full valuation allowance against its federal and various state research credits which it earns in excess of its current year tax liabilities, as well as a portion against its net operating loss carryforwards. Based on the available objective positive and negative evidence, the Company has determined that it is more likely than not that these research credits and acquired net operating losses will not be realized.	'	'
Tax credit carryforwards, increase in valuation allowance	36,400,000	'	'
Research \| Internal Revenue Service (IRS)	'	'	'
Income Taxes [Line Items]	'	'	'
Tax credit carryforwards	211,800,000	'	'
Tax credit carryforward, expiration dates	'Expire through fiscal 2034	'	'
Net operating loss carryforwards, amount attributable to excess tax benefits from stock options	53,900,000	'	'
Research \| California	'	'	'
Income Taxes [Line Items]	'	'	'
Tax credit carryforwards	211,400,000	'	'
Tax credit carryforward, expiration dates	'Which can be carryforward indefinitely	'	'
Net operating loss carryforwards, amount attributable to excess tax benefits from stock options	52,300,000	'	'
Research and Investment \| Other State	'	'	'
Income Taxes [Line Items]	'	'	'
Tax credit carryforwards	$18,800,000	'	'
Tax credit carryforward, expiration dates	'Expire through fiscal 2029	'	'

Reconciliation_of_Statutory_Fe

Reconciliation of Statutory Federal Income Tax to Effective Tax (Detail)	12 Months Ended
	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Reconciliation of Statutory Federal Tax Rate [Line Items]	'	'	'
Provision at U.S. notional statutory rate	35.00%	35.00%	35.00%
Non-deductible share-based compensation	19.40%	15.40%	6.90%
Difference in U.S. and non-U.S. tax rates	-55.80%	-48.80%	-40.70%
Benefits from utilization of general business credits	-14.10%	-13.80%	-6.80%
Change in valuation allowance	11.90%	12.90%	5.60%
Other	0.60%	0.50%	0.60%
Effective tax rate	-3.00%	1.20%	0.60%

Changes_in_Unrecognized_Tax_Be

Changes in Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Income Tax Contingency [Line Items]	'	'	'
Unrecognized tax benefits at beginning of the year	$79,031	$96,294	$102,612
Increases related to prior year tax positions	499	1,106	987
Decreases related to prior year tax positions	-111	'	-307
Increases related to current year tax positions	2,666	1,139	1,229
Settlements	-7,423	-3,956	-243
Lapse in the statute of limitations	-13,969	-15,543	-9,529
Foreign exchange (gain) loss	-9,011	-9	1,545
Gross amounts of unrecognized tax benefits at end of the year	$51,682	$79,031	$96,294

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
In Millions, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Aug. 06, 2012	Dec. 26, 2012	Feb. 01, 2014	Feb. 01, 2014
	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Lake Cherokee Patent I Litigation	Carnegie Mellon Litigation	Carnegie Mellon Litigation	Manufacturing Expense
Commitments and Contingencies Disclosure [Line Items]	'	'	'	'	'	'	'
Standard warranty period	'90 days	'	'	'	'	'	'
Extended warranty period	'1 year	'	'	'	'	'	'
Description of extended warranty period	'Warranty period can extend to more than one year based on contractual agreements	'	'	'	'	'	'
Rent expense, net of sublease income	$25.80	$23.70	$20.50	'	'	'	'
Purchase commitment, outstanding commitment	'	'	'	'	'	'	270.9
Accrual related to an ongoing litigation matter	15.2	'	'	'	'	'	'
Date of lawsuit filed	'	'	'	'	6-Mar-09	'	'
Loss contingency, damages claim	'	'	'	193	1,170	'	'
Pre-judgment interest	'	'	'	'	322	'	'
Loss contingency, range of possible loss, minimum	'	'	'	'	'	$0	'

Future_Minimum_Lease_Payments_

Future Minimum Lease Payments, Net of Estimated Sublease Income under Operating and Capital Leases (Detail) (USD $)	Feb. 01, 2014
In Thousands, unless otherwise specified	Feb. 01, 2014
Fiscal Year:	'
2015	$75,606
2016	61,699
2017	32,705
2018	6,455
2019	1,150
Thereafter	1,785
Total future minimum lease payments	179,400
Minimum Lease Payments	'
Fiscal Year:	'
2015	75,678
2016	61,774
2017	32,751
2018	6,455
2019	1,150
Thereafter	1,785
Total future minimum lease payments	179,593
Sublease Income	'
Fiscal Year:	'
2015	-72
2016	-75
2017	-46
Total future minimum lease payments	($193)

Future_Minimum_Payments_Under_

Future Minimum Payments Under Technology License Obligations (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013
Fiscal Year:	'	'
Less: current portion	($18,482)	($9,865)
Non-current portion	28,959	34,270
Technology License Agreement	'	'
Fiscal Year:	'	'
2015	14,913	'
2016	13,145	'
2017	7,869	'
2018	9,180	'
2019	'	'
Thereafter	'	'
Total future minimum lease payments	45,107	'
Less: amount representing interest	-2,027	'
Present value of future minimum payments	43,080	'
Less: current portion	-14,121	'
Non-current portion	$28,959	'

Benefit_Plans_Additional_Infor

Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
Benefit Plans - Additional Information (Detail) (USD $)	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Defined Contribution Pension Plan 401k	'	'	'
Postemployment Benefits Disclosure [Line Items]	'	'	'
401(k) savings and investment plan, general description of the plan	'The Company sponsors a 401(k) savings and investment plan that allows eligible U.S. employees to participate by making pre-tax contributions to the 401(k) plan ranging from 1% to 50% of eligible earnings subject to a required annual limit. The Company matches 100% of the employee contribution up to $500 per eligible employee on a quarterly basis. The participant must be employed by the Company on the last day of the calendar quarter to qualify for the match. At the end of the calendar year, the eligible employees receive a true-up match equal to the accumulated employee contribution for the calendar year up to $2,000.	'	'
Defined contribution plan, cost recognized	$5,000,000	$5,000,000	$4,800,000
Defined Contribution Pension Plan 401k \| Minimum	'	'	'
Postemployment Benefits Disclosure [Line Items]	'	'	'
Employee pre-tax contributions to 401(k)	1.00%	'	'
Defined Contribution Pension Plan 401k \| Maximum	'	'	'
Postemployment Benefits Disclosure [Line Items]	'	'	'
Employee pre-tax contributions to 401(k)	50.00%	'	'
Defined Contribution Pension Plan 401k \| Quarterly Match \| Maximum	'	'	'
Postemployment Benefits Disclosure [Line Items]	'	'	'
Employer match contributions	500	'	'
Defined Contribution Pension Plan 401k \| Annual True Up Match \| Maximum	'	'	'
Postemployment Benefits Disclosure [Line Items]	'	'	'
Employer match contributions	2,000	'	'
Defined Contribution Plans Non-U.S Locations	'	'	'
Postemployment Benefits Disclosure [Line Items]	'	'	'
Employer match contributions	$20,600,000	$17,200,000	$16,200,000

Shareholders_Equity_Additional

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

1 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

31-May-13

Aug. 19, 2010

Feb. 01, 2014

Feb. 02, 2013

Jan. 28, 2012

Jan. 31, 2014

Feb. 20, 2014

Feb. 01, 2014

Feb. 02, 2013

Jan. 28, 2012

Feb. 01, 2014

Jan. 28, 2012

Feb. 01, 2014

Feb. 02, 2013

Feb. 01, 2014

Feb. 02, 2013

Feb. 01, 2014

Feb. 02, 2013

Feb. 01, 2014

Feb. 02, 2013

Jan. 28, 2012

Subsequent Event

Time Based Option Award

Market Based Option Award

Restricted Stock Units (RSUs)

Employee Stock Option Plan, 1995 Plan

Directors Stock Option Plan, 1997 Plan

Director Stock Incentive Plan, 2007 Plan

Employee Stock Purchase Plan, 2000 Restated Plan

Employee Stock Purchase Plan, 2000 Plan

Installment

After One Year From Vesting Commencement Date

Per Month Over Remaining Months

Incentive Stock Option

Upon Appointment To Board of Directors

On Date Of Annual Meeting Of Shareholders

After One Year From Vesting Commencement Date

Per Month Over Remaining Months

Per Month Over 12 Months After Fourth Anniversary of Vesting Commencement Date

Upon Appointment To Board of Directors

Upon ReElection By Shareholders

Outside director who was appointed

First Anniversary Of Grant Date

Second Anniversary Of Grant Date and Thereafter

Restricted Stock Units (RSUs)

Employee Stock Option

Upon Appointment To Board of Directors

On Date Of Annual Meeting Of Shareholders

Upon Appointment To Board of Directors

Outside director who was appointed

Outside director who is first elected or appointed

Outside director who was appointed

Maximum

Fiscal 2015

Maximum

Stockholders Equity Note [Line Items]

Common stock, shares authorized

992,000,000

Common stock, par value

$0.00

Preferred stock, shares authorized

8,000,000

Preferred stock, par value

$0.00

Preferred stock, shares outstanding

Shares reserved for issuance, authorized

383,400,000

750,000

Equity awards, expiration term

'5 years

'10 years

'5 years

'10 years

Stock option, purchase price as percentage of fair market value

110.00%

Equity awards, vesting percentage

20.00%

1.67%

20.00%

1.67%

8.33%

100.00%

33.33%

100.00%

Equity awards, vesting term

'48 months

'12 months

Equity awards, number of installments

Number of shares available for future issuance

95,200,000

204,924

24,500,000

Number of shares authorized to a director

30,000

6,000

50,000

9,000

10,000

20,000

25,000

Equity awards, aggregate fair market value

$70,000

$110,000

$220,000

Stock option award

110,000

Employee stock purchase plan, maximum subscription rate

15.00%

Employee stock purchase plan, "look-back" period

'24 months

'6 months

Employee stock purchase plan, percentage discount of purchase price per share of common shares

85.00%

Employee stock purchase plan, shares issued

9,700,000

7,600,000

4,900,000

Employee stock purchase plan, weighted-average price

$7.39

$8.77

$12.48

Options vested and expected to vest, aggregate intrinsic value

128,300,000

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

'6 years 2 months 12 days

'7 years 2 months 12 days

Options exercisable, aggregate intrinsic value

62,800,000

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

'4 years

Aggregate intrinsic value of stock options exercised

51,100,000

33,600,000

41,800,000

Closing stock price

$14.93

Unrecognized share based compensation cost

63,400,000

86,500,000

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

'2 years 9 months 18 days

'1 year 8 months 12 days

Restricted stock units, aggregate intrinsic value

157,700,000

Restricted stock units vested and expected to vest

10,600,000

Stock-based compensation capitalized in inventory

1,700,000

1,500,000

2,100,000

Shares Granted

18,922,000

7,041,000

6,626,000

18,922,000

7,041,000

3,477,000

3,149,000

Expected term (in years)

'5 years

'4 years 9 months 18 days

'2 years 7 months 28 days

Share repurchase program, amount authorized

500,000,000

3,000,000,000

Share repurchase program, additional authorized amount

1,000,000,000

1,500,000,000

Share repurchase program, shares repurchased

33,100,000

91,000,000

87,800,000

Share repurchase program, amount repurchased

354,100,000

959,100,000

1,300,000,000

Share repurchase program, cumulative shares repurchased

216,900,000

Share repurchase program, total amount of repurchases

2,700,000,000

Share repurchase program, remaining available for future share repurchases

258,400,000

Dividend per share, paid

$0.06

$0.24

$0.18

Total Dividends paid

$119,449,000

$98,761,000

Dividend per share, declared

$0.24

$0.18

$0.06

Dividends declared, date to be paid

27-Mar-14

Dividends declared, date of record

13-Mar-14

Stock_Option_Plan_Activity_Det

Stock Option Plan Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Options Outstanding	'	'	'
Beginning Balance	52,396	55,591	56,325
Granted	18,922	7,041	6,626
Exercised	-15,482	-5,977	-5,681
Canceled/Forfeited	-4,057	-4,259	-1,679
Expired	'	'	'
Ending Balance	51,779	52,396	55,591
Weighted Average Exercise Price	'	'	'
Beginning Balance	$13.39	$12.70	$11.96
Granted	$10.82	$14.59	$15.37
Exercised	$9.40	$6.44	$7.95
Canceled/Forfeited	$15.16	$16.04	$14.58
Expired	'	'	'
Ending Balance	$13.51	$13.39	$12.70
Time Based Option Award	'	'	'
Options Outstanding	'	'	'
Beginning Balance	49,637	52,467	56,325
Granted	18,922	7,041	3,477
Exercised	-15,482	-5,977	-5,681
Canceled/Forfeited	-3,921	-3,894	-1,654
Expired	'	'	'
Ending Balance	49,156	49,637	52,467
Vested or expected to vest at February 1, 2014	45,913	'	'
Exercisable at February 1, 2014	25,318	'	'
Weighted Average Exercise Price	'	'	'
Beginning Balance	$13.28	$12.53	$11.96
Granted	$10.82	$14.59	$15.31
Exercised	$9.40	$6.44	$7.95
Canceled/Forfeited	$15.15	$16.10	$14.57
Expired	'	'	'
Ending Balance	$13.40	$13.28	$12.53
Vested or expected to vest at February 1, 2014	$13.55	'	'
Exercisable at February 1, 2014	$14.88	'	'
Market Based Option Award	'	'	'
Options Outstanding	'	'	'
Beginning Balance	2,759	3,124	'
Granted	'	'	3,149
Canceled/Forfeited	-136	-365	-25
Expired	'	'	'
Ending Balance	2,623	2,759	3,124
Weighted Average Exercise Price	'	'	'
Beginning Balance	$15.43	$15.43	'
Granted	'	'	$15.43
Canceled/Forfeited	$15.43	$15.43	$15.43
Expired	'	'	'
Ending Balance	$15.43	$15.43	$15.43

Activity_Related_to_Non_Vested

Activity Related to Non Vested Portion of Restricted Stock Units (Detail) (Restricted Stock Units (RSUs), USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Restricted Stock Units (RSUs)	'	'	'
Restricted Stock Units Outstanding	'	'	'
Beginning Balance	12,739	9,646	5,486
Granted	3,828	7,370	6,877
Vested	-3,925	-2,796	-2,014
Canceled/Forfeited	-1,288	-1,481	-703
Ending Balance	11,354	12,739	9,646
Weighted Average Grant Date Fair Value	'	'	'
Beginning Balance	$15.78	$17.38	$18.75
Granted	$10.78	$14.64	$15.80
Vested	$16.19	$17.78	$15.90
Canceled/Forfeited	$14.39	$17.16	$16.81
Ending Balance	$14.11	$15.78	$17.38

Total_Stock_Compensation_by_Ex

Total Stock Compensation by Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based compensation expense	$155,873	$127,280	$119,863
Cost of goods sold	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based compensation expense	8,863	8,142	6,995
Research and development	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based compensation expense	109,432	87,149	85,924
Selling and marketing	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based compensation expense	13,940	13,278	12,920
General and administrative	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based compensation expense	$23,638	$18,711	$14,024

Weighted_Average_Assumptions_U

Weighted Average Assumptions Used to Calculate Fair Value of Time Based Equity Award (Detail) (Time Based Option Award, USD $)	12 Months Ended
	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Time Based Option Award	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted average fair value	$3.43	$5.52	$6.05
Expected volatility	45.00%	44.00%	44.00%
Expected term (in years)	'5 years	'4 years 9 months 18 days	'4 years 9 months 18 days
Risk-free interest rate	0.80%	0.90%	2.00%
Expected dividend yield	2.40%	0.30%	'

Weighted_Average_Assumptions_U1

Weighted Average Assumptions Used to Calculate Fair Value of Market Based Option Award (Detail) (Market Based Option Award, USD $)	12 Months Ended
	Jan. 28, 2012
Market Based Option Award	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Weighted average fair value	$5.08
Expected volatility	42.00%
Risk-free interest rate, minimum	0.90%
Risk-free interest rate, maximum	3.60%

Weighted_Average_Assumptions_U2

Weighted Average Assumptions Used to Calculate Fair Value of Employee Stock Purchase Plan (Detail) (Employee Stock, USD $)	12 Months Ended
	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Employee Stock	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Estimated fair value	$3.65	$3.13	$4.63
Expected volatility	37.00%	40.00%	44.00%
Expected term (in years)	'1 year 3 months 18 days	'1 year 2 months 12 days	'1 year 1 month 6 days
Risk-free interest rate	0.20%	0.20%	0.10%
Expected dividend yield	2.00%	2.40%	'

Segment_and_Geographic_Informa2

Segment and Geographic Information - Additional Information (Detail)	12 Months Ended
	Feb. 01, 2014
	Segment
Segment Reporting Information [Line Items]	'
Number of reportable segment	1

Net_Revenue_and_LongLived_Asse

Net Revenue and Long-Lived Asset Information based on Geographic Region (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Feb. 01, 2014

Nov. 02, 2013

Aug. 03, 2013

4-May-13

Feb. 02, 2013

Oct. 27, 2012

Jul. 28, 2012

Apr. 28, 2012

Feb. 01, 2014

Feb. 02, 2013

Jan. 28, 2012

Revenues from External Customers and Long-Lived Assets [Line Items]

Net revenue

$931,749

[1]

$931,226

[2]

$807,056

[3]

$734,369

$775,294

[4]

$780,881

$816,104

[5]

$796,351

[6]

$3,404,400

$3,168,630

$3,393,040

Property and equipment, net

356,165

372,971

356,165

372,971

United States

Revenues from External Customers and Long-Lived Assets [Line Items]

Net revenue

68,321

176,581

194,638

Property and equipment, net

195,253

208,459

195,253

208,459

China

Revenues from External Customers and Long-Lived Assets [Line Items]

Net revenue

1,869,381

1,599,681

1,496,864

Property and equipment, net

29,146

27,724

29,146

27,724

Thailand

Revenues from External Customers and Long-Lived Assets [Line Items]

Net revenue

353,363

369,855

531,073

Malaysia

Revenues from External Customers and Long-Lived Assets [Line Items]

Net revenue

352,756

351,401

420,382

Philippines

Revenues from External Customers and Long-Lived Assets [Line Items]

Net revenue

257,899

246,269

207,450

Others

Revenues from External Customers and Long-Lived Assets [Line Items]

Net revenue

502,680

424,843

542,633

Property and equipment, net

17,188

16,379

17,188

16,379

Bermuda

Revenues from External Customers and Long-Lived Assets [Line Items]

Property and equipment, net

4,453

5,691

4,453

5,691

Israel

Revenues from External Customers and Long-Lived Assets [Line Items]

Property and equipment, net

33,758

36,671

33,758

36,671

Singapore

Revenues from External Customers and Long-Lived Assets [Line Items]

Property and equipment, net

$76,367

$78,047

$76,367

$78,047

[1]

[2]

The third quarter of fiscal 2014 includes $4.2 million of restructuring and other exit-related costs.

[3]

The second quarter of fiscal 2014 includes $5.2 million for litigation settlements that do not relate to the litigation with Carnegie Mellon University.

[4]

The fourth quarter of fiscal 2013 includes $5.7 million for an expense related to an ongoing litigation that did not relate to the litigation with Carnegie Mellon University.

[5]

The second quarter of fiscal 2013 includes $1.6 million for expenses related to acquisitions in prior fiscal years.

[6]

The first quarter of fiscal 2013 includes $2.5 million for expenses related to acquisitions in prior fiscal years.

Net_Revenue_by_End_Market_Deta

Net Revenue by End Market (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Feb. 01, 2014

Nov. 02, 2013

Aug. 03, 2013

4-May-13

Feb. 02, 2013

Oct. 27, 2012

Jul. 28, 2012

Apr. 28, 2012

Feb. 01, 2014

Feb. 02, 2013

Jan. 28, 2012

Revenue from External Customer [Line Items]

Net revenue

$931,749

[1]

$931,226

[2]

$807,056

[3]

$734,369

$775,294

[4]

$780,881

$816,104

[5]

$796,351

[6]

$3,404,400

$3,168,630

$3,393,040

Storage

Revenue from External Customer [Line Items]

Net revenue

1,681,953

1,494,959

1,560,772

Mobile and Wireless

Revenue from External Customer [Line Items]

Net revenue

839,407

822,533

968,706

Networking

Revenue from External Customer [Line Items]

Net revenue

670,249

708,821

697,865

Other products

Revenue from External Customer [Line Items]

Net revenue

$212,791

$142,317

$165,697

[1]

[2]

The third quarter of fiscal 2014 includes $4.2 million of restructuring and other exit-related costs.

[3]

The second quarter of fiscal 2014 includes $5.2 million for litigation settlements that do not relate to the litigation with Carnegie Mellon University.

[4]

The fourth quarter of fiscal 2013 includes $5.7 million for an expense related to an ongoing litigation that did not relate to the litigation with Carnegie Mellon University.

[5]

The second quarter of fiscal 2013 includes $1.6 million for expenses related to acquisitions in prior fiscal years.

[6]

The first quarter of fiscal 2013 includes $2.5 million for expenses related to acquisitions in prior fiscal years.

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	Feb. 01, 2014	Feb. 01, 2014	Feb. 01, 2014	Dec. 31, 2012	Dec. 31, 2012	Feb. 01, 2014	Feb. 02, 2013	Feb. 01, 2014	Feb. 01, 2014	Feb. 02, 2013	Feb. 01, 2014
In Millions, unless otherwise specified		Vivante Corporation	Vivante Corporation	Vivante Corporation	Vivante Corporation	Vivante Corporation	Vivante Corporation	Veri Silicon Holdings Company Limited	Veri Silicon Holdings Company Limited	Veri Silicon Holdings Company Limited	Immediate Family Member of Management or Principal Owner
		Technology License Agreement	Restated Technology Agreement	Restated Technology Agreement	Restated Technology Agreement	Restated Technology Agreement	Restated Technology Agreement	Technology License Agreement	Technology License Agreement	Technology License Agreement
				License Fees	Support Fees	License and Support Fees	License and Support Fees		License and Support Fees	License and Support Fees
Related Party Transaction [Line Items]	'	'	'	'	'	'	'	'	'	'	'
License Agreement	'	'In December 2009, MIL entered into a technology license agreement with Vivante Corporation ("Vivante") that provides for the license of graphics technology and associated services. This agreement restates, expands and succeeds previous agreements between the parties for the same technology.	'	'	'	'	'	'MIL is party to a technology license agreement with VeriSilicon Holdings Co., Ltd. ("VeriSilicon"). MIL assumed this technology license agreement between VeriSilicon and UTStarcom, Inc. after the Company's acquisition of the semiconductor business of UTStarcom in December 2005. MIL has subsequently entered into various addenda to this agreement for additional technology beyond the scope of the original agreement. During fiscal 2013, MIL entered into two new addenda with VeriSilicon related to the technology license agreement. In addition, in September 2010, MIL entered into a services agreement with VeriSilicon, pursuant to which VeriSilicon has agreed to provide design support services to MIL. Under the services agreement, VeriSilicon helped on three projects for MIL during fiscal 2013.	'	'	'
Amount of transactions with related parties	'	'	'	$13	'	$6.90	$8.60	'	$2	$2.80	'
Liability to related party	'	'	$8.90	'	'	'	'	$1.50	'	'	'
Related party ownership percentage by Ms. Dai	'	'	'	'	'	'	'	'	'	'	10.00%
Payment period	'	'	'	'3 years	'3 years	'	'	'	'	'	'
Maintenance fees	'	'	'	'	10.00%	'	'	'	'	'	'
Technology license agreement, renewed term	'3 years	'	'	'	'	'	'	'	'	'	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Feb. 01, 2014	Aug. 03, 2013	Feb. 02, 2013	Mar. 27, 2014
	Feb. 01, 2014	Aug. 03, 2013	Feb. 02, 2013	Subsequent Event
Subsequent Event [Line Items]	'	'	'	'
Estimated litigation matters	'	'	'	$9.50
Litigation settlements	$9.50	$5.20	$5.70	'

Quarterly_Unaudited_Consolidat

Quarterly Unaudited Consolidated Statements of Operations Data (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Feb. 01, 2014

Nov. 02, 2013

Aug. 03, 2013

4-May-13

Feb. 02, 2013

Oct. 27, 2012

Jul. 28, 2012

Apr. 28, 2012

Feb. 01, 2014

Feb. 02, 2013

Jan. 28, 2012

Quarterly Financial Information [Line Items]

Net revenue

$931,749

[1]

$931,226

[2]

$807,056

[3]

$734,369

$775,294

[4]

$780,881

$816,104

[5]

$796,351

[6]

$3,404,400

$3,168,630

$3,393,040

Gross profit

454,497

[1]

466,245

[2]

420,997

[3]

398,931

404,461

[4]

406,378

434,265

[5]

430,029

[6]

Net income

$97,129

[1]

$103,156

[2]

$61,826

[3]

$53,209

$50,152

[4]

$68,816

$93,074

[5]

$94,543

[6]

$315,320

$306,585

$615,091

Net income per share:

Basic

$0.20

[1]

$0.21

[2]

$0.13

[3]

$0.11

$0.10

[4]

$0.12

$0.17

[5]

$0.16

[6]

$0.64

$0.55

$1.01

Diluted

$0.19

[1]

$0.21

[2]

$0.12

[3]

$0.11

$0.09

[4]

$0.12

$0.16

[5]

$0.16

[6]

$0.63

$0.54

$0.99

[1]

[2]

The third quarter of fiscal 2014 includes $4.2 million of restructuring and other exit-related costs.

[3]

The second quarter of fiscal 2014 includes $5.2 million for litigation settlements that do not relate to the litigation with Carnegie Mellon University.

[4]

The fourth quarter of fiscal 2013 includes $5.7 million for an expense related to an ongoing litigation that did not relate to the litigation with Carnegie Mellon University.

[5]

The second quarter of fiscal 2013 includes $1.6 million for expenses related to acquisitions in prior fiscal years.

[6]

The first quarter of fiscal 2013 includes $2.5 million for expenses related to acquisitions in prior fiscal years.

Quarterly_Unaudited_Consolidat1

Quarterly Unaudited Consolidated Statements of Operations Data (Parenthetical) (Detail) (USD $)	3 Months Ended						12 Months Ended
	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	Feb. 02, 2013	Jul. 28, 2012	Apr. 28, 2012	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Quarterly Financial Information [Line Items]	'	'	'	'	'	'	'	'	'
Litigation settlements	$9,500,000	'	$5,200,000	$5,700,000	'	'	'	'	'
Restructuring charges	'	4,200,000	'	'	'	'	4,732,000	1,257,000	1,856,000
Gain from sale of business	7,000,000	'	'	'	'	'	'	'	'
Impairment charge, intangible asset	8,100,000	'	'	'	'	'	8,100,000	'	0
Expenses related to acquisitions	'	'	'	'	$1,600,000	$2,500,000	'	'	'

SCHEDULE_II_VALUATION_AND_QUAL1

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Allowance for doubtful accounts and sales return reserve	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Year	$7,921	$2,663	$7,366
Additions	3,808	9,024	4,393
Deductions	-9,435	-3,766	-9,096
Balance at End of Year	2,294	7,921	2,663
Deferred tax valuation	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Year	299,449	259,316	224,853
Additions	36,441	40,133	34,694
Deductions	'	'	-231
Balance at End of Year	$335,890	$299,449	$259,316