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Document and Entity Information - USD ($) shares in Millions	12 Months Ended
	Feb. 03, 2018	Mar. 22, 2018	Jul. 28, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Feb. 03, 2018
Document Fiscal Year Focus	2018
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	--02-03
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity File Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		496.5
Entity Public Float			$ 5,333,299,261

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Current assets:
Cash and cash equivalents	$ 888,482	$ 814,092
Short-term investments	952,790	854,268
Accounts receivable, net of provision for sales returns and allowances of $2,500 and $1,384 in fiscal 2018 and 2017, respectively	280,395	335,384
Inventories	170,039	170,842
Prepaid expenses and other current assets	41,482	58,771
Assets held for sale	30,767	57,077
Total current assets	2,363,955	2,290,434
Property and equipment, net	202,222	243,397
Goodwill and acquired intangible assets, net	1,993,310	1,996,880
Other non-current assets	148,800	117,939
Total assets	4,708,287	4,648,650
Current liabilities:
Accounts payable	145,236	143,484
Accrued liabilities	86,958	143,491
Accrued employee compensation	127,711	139,647
Deferred income	61,237	63,976
Current liabilities held for sale	0	5,818
Total current liabilities	421,142	496,416
Non-current income taxes payable	56,976	60,646
Other non-current liabilities	88,756	63,937
Total liabilities	566,874	620,999
Commitments and contingencies (Note 10)
Shareholders’ equity:
Preferred stock, $0.002 par value; 8,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.002 par value; 992,000 shares authorized; 495,913 and 506,095 shares issued and outstanding in fiscal 2018 and 2017, respectively	991	1,012
Additional paid-in capital	2,733,292	3,016,775
Accumulated other comprehensive income (loss)	(2,322)	23
Retained earnings	1,409,452	1,009,841
Total shareholders’ equity	4,141,413	4,027,651
Total liabilities and shareholders’ equity	$ 4,708,287	$ 4,648,650

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Statement of Financial Position [Abstract]
Accounts receivable, provision for sales return and allowances	$ 2,500	$ 1,384
Preferred stock, par value (in usd per share)	$ 0.002	$ 0.002
Preferred stock, shares authorized	8,000,000	8,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in usd per share)	$ 0.002	$ 0.002
Common stock, shares authorized	992,000,000	992,000,000
Common stock, shares issued	495,913,000	506,095,000
Common stock, shares outstanding	495,913,000	506,095,000

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Income Statement [Abstract]
Net revenue	$ 2,409,170	$ 2,300,992	$ 2,602,497
Cost of goods sold	947,230	1,017,564	1,406,121
Gross Profit	1,461,940	1,283,428	1,196,376
Operating expenses:
Research and development	714,444	805,029	954,653
Selling, general and administrative	238,166	251,191	279,215
Litigation settlement	74,385	0	654,667
Restructuring related charges	5,250	96,801	53,251
Total operating expenses	1,032,245	1,153,021	1,941,786
Operating income (loss) from continuing operations	429,695	130,407	(745,410)
Interest and other income, net	21,509	17,022	17,685
Income (loss) from continuing operations before income taxes	451,204	147,429	(727,725)
Provision for income taxes	18,062	72,608	10,716
Income (loss) from continuing operations, net of tax	433,142	74,821	(738,441)
Income (loss) from discontinued operations, net of tax	87,689	(53,670)	(72,959)
Net income (loss)	$ 520,831	$ 21,151	$ (811,400)
Net income (loss) per share - Basic:
Continuing operations (in usd per share)	$ 0.87	$ 0.15	$ (1.45)
Discontinued operations (in usd per share)	0.18	(0.11)	(0.14)
Net Income (loss) per share - Basic (in usd per share)	1.05	0.04	(1.59)
Net income (loss) per share - Diluted:
Continuing operations (in usd per share)	0.85	0.14	(1.45)
Discontinued operations (in usd per share)	0.17	(0.10)	(0.14)
Net Income (loss) per share - diluted (in usd per share)	$ 1.02	$ 0.04	$ (1.59)
Weighted average shares:
Basic (in shares)	498,008	509,738	510,945
Diluted (in shares)	509,667	517,513	510,945
Cash dividends declared per share (in usd per share)	$ 0.24	$ 0.24	$ 0.24

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 520,831	$ 21,151	$ (811,400)
Other comprehensive income (loss), net of tax:
Net change in unrealized loss on marketable securities	(1,521)	(145)	(4,424)
Net change in unrealized gain on auction rate securities	0	0	2,274
Net change in unrealized gain (loss) on cash flow hedges	(824)	963	1,047
Other comprehensive income (loss), net of tax	(2,345)	818	(1,103)
Comprehensive income (loss), net of tax	$ 518,486	$ 21,969	$ (812,503)

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance (in shares) at Jan. 31, 2015		515,037
Balance at beginning of period at Jan. 31, 2015	$ 5,146,089	$ 1,030	$ 3,099,548	$ 308	$ 2,045,203
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of ordinary shares in connection with equity incentive plans (in shares)		12,235
Issuance of ordinary shares in connection with equity incentive plans	80,714	$ 24	80,690
Tax withholdings related to net share settlement of restricted stock units	(24,355)		(24,355)
Share-based compensation	133,766		133,766
Tax benefit from employee stock transactions	$ 108		108
Repurchase of common stock (in shares)	(19,700)	(19,700)
Repurchase of common stock	$ (260,875)	$ (39)	(260,836)
Cash dividends declared and paid (cumulatively $0.24 per share)	(122,821)				(122,821)
Net income (loss)	(811,400)				(811,400)
Other comprehensive gain (loss)	(1,103)			(1,103)
Balance (in shares) at Jan. 30, 2016		507,572
Balance at end of period at Jan. 30, 2016	4,140,123	$ 1,015	3,028,921	(795)	1,110,982
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of ordinary shares in connection with equity incentive plans (in shares)		11,826
Issuance of ordinary shares in connection with equity incentive plans	74,216	$ 24	74,192
Tax withholdings related to net share settlement of restricted stock units	(16,679)		(16,679)
Share-based compensation	113,402		113,402
Tax benefit from employee stock transactions	$ (24)		(24)
Repurchase of common stock (in shares)	(13,303)	(13,303)
Repurchase of common stock	$ (183,064)	$ (27)	(183,037)
Cash dividends declared and paid (cumulatively $0.24 per share)	(122,292)				(122,292)
Net income (loss)	21,151				21,151
Other comprehensive gain (loss)	818			818
Balance (in shares) at Jan. 28, 2017		506,095
Balance at end of period at Jan. 28, 2017	4,027,651	$ 1,012	3,016,775	23	1,009,841
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of stock compensation accounting change - see Note 2	0		1,969		(1,969)
Issuance of ordinary shares in connection with equity incentive plans (in shares)		21,278
Issuance of ordinary shares in connection with equity incentive plans	180,302	$ 42	180,260
Tax withholdings related to net share settlement of restricted stock units	(26,840)		(26,840)
Share-based compensation	$ 87,140		87,140
Repurchase of common stock (in shares)	(31,460)	(31,460)
Repurchase of common stock	$ (526,075)	$ (63)	(526,012)
Cash dividends declared and paid (cumulatively $0.24 per share)	(119,251)				(119,251)
Net income (loss)	520,831				520,831
Other comprehensive gain (loss)	(2,345)			(2,345)
Balance (in shares) at Feb. 03, 2018		495,913
Balance at end of period at Feb. 03, 2018	$ 4,141,413	$ 991	$ 2,733,292	$ (2,322)	$ 1,409,452

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in usd per share)	$ 0.24	$ 0.24	$ 0.24
Cash dividends paid (in usd per share)	$ 0.24	$ 0.24	$ 0.24

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 520,831,000	$ 21,151,000	$ (811,400,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	83,487,000	107,851,000	100,176,000
Share-based compensation	86,689,000	113,970,000	133,779,000
Amortization and write-off of acquired intangible assets	3,570,000	10,641,000	12,688,000
Restructuring related impairment charges (gain)	(4,561,000)	52,581,000	16,032,000
Loss (gain) from investments in privately-held companies	(2,501,000)	0	3,503,000
Amortization of premium /discount on available-for-sale securities	995,000	3,319,000	8,112,000
Other non-cash expense (income), net	1,324,000	(3,312,000)	2,196,000
Excess tax benefits from share-based compensation	0	(37,000)	(26,000)
Deferred income taxes	19,825,000	44,637,000	6,096,000
Gain on sale of property and equipment	(743,000)	0	0
Gain on sale of discontinued operations	(88,406,000)	0	0
Gain on sale of business	(5,254,000)	0	0
Changes in assets and liabilities:
Accounts receivable	54,989,000	(12,084,000)	97,655,000
Inventories	(12,160,000)	29,325,000	90,586,000
Prepaid expenses and other assets	12,494,000	1,825,000	(23,209,000)
Accounts payable	(16,613,000)	(28,153,000)	(105,898,000)
Accrued liabilities and other non-current liabilities	(62,360,000)	3,763,000	(15,202,000)
Carnegie Mellon University accrued litigation settlement	0	(736,000,000)	736,000,000
Accrued employee compensation	(11,936,000)	18,016,000	(33,338,000)
Deferred income	(8,557,000)	14,072,000	(12,398,000)
Net cash provided by (used in) operating activities	571,113,000	(358,435,000)	205,352,000
Cash flows from investing activities:
Purchases of available-for-sale securities	(835,494,000)	(489,856,000)	(1,056,045,000)
Sales of available-for-sale securities	306,822,000	616,697,000	991,657,000
Maturities of available-for-sale securities	426,341,000	239,557,000	311,843,000
Return of investment from (in) privately-held companies	6,089,000	16,000	(41,000)
Purchases of time deposits	(300,000,000)	(275,000,000)	0
Maturities of time deposits	300,000,000	125,000,000	0
Purchases of technology licenses	(6,587,000)	(10,309,000)	(8,236,000)
Purchases of property and equipment	(38,551,000)	(44,510,000)	(37,255,000)
Proceeds from sales of property and equipment	12,559,000	0	10,007,000
Purchases of equipment previously leased	0	0	(10,240,000)
Net proceeds from sale of discontinued operations	165,940,000	0	0
Net proceeds from sale of business	2,402,000	0	0
Net cash provided by investing activities	39,521,000	161,595,000	201,690,000
Cash flows from financing activities:
Repurchases of common stock	(527,574,000)	(181,564,000)	(260,875,000)
Proceeds from employee stock plans	180,302,000	74,219,000	80,717,000
Minimum tax withholding paid on behalf of employees for net share settlement	(26,840,000)	(16,683,000)	(24,358,000)
Dividend payments to shareholders	(119,251,000)	(122,292,000)	(122,821,000)
Payments on technology license obligations	(28,503,000)	(20,965,000)	(12,528,000)
Excess tax benefits from share-based compensation	0	37,000	26,000
Payment of equity and debt financing costs	(14,378,000)	0	0
Net cash used in financing activities	(536,244,000)	(267,248,000)	(339,839,000)
Net increase (decrease) in cash and cash equivalents	74,390,000	(464,088,000)	67,203,000
Cash and cash equivalents at beginning of the year	814,092,000	1,278,180,000	1,210,977,000
Cash and cash equivalents at end of the year	$ 888,482,000	$ 814,092,000	$ 1,278,180,000

Basis of Presentation	12 Months Ended
Basis of Presentation	Feb. 03, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The Company Marvell Technology Group Ltd., a Bermuda exempted company, and its subsidiaries (the “Company”), is a fabless semiconductor provider of high-performance application-specific standard products. The Company’s core strength 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 standalone integrated circuits. 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. The Company’s broad product portfolio includes devices for storage, networking and connectivity. Basis of Presentation The Company’s fiscal year is the 52- or 53-week period ending on the Saturday closest to January 31. Accordingly, every fifth or sixth fiscal year will have a 53-week period. The additional week in a 53-week year is added to the fourth quarter, making such quarter consist of 14 weeks. Fiscal 2018 is a 53-week year. Fiscal 2017 and 2016 each had a 52-week period. During the first fiscal quarter of 2018, the Company recorded certain out-of-period adjustments of $4.7 million related to revenue-related accruals and $3.2 million related to other expenses. The net effect of these out-of-period adjustments resulted in a $7.9 million increase in income from continuing operations for the year ended February 3, 2018, an increase in basic earnings per share from continuing operations of $0.02 per share, and an increase in diluted earnings per share from continuing operations of $0.02 per share, as well as contributing to the increase in revenue and gross margin for the year ended February 3, 2018. On November 19, 2017, the Company entered into an agreement and plan of merger (the “Merger Agreement”) with Cavium, Inc. ("Cavium"), pursuant to which a subsidiary of the Company will merge with and into Cavium, with Cavium surviving and becoming a wholly-owned indirect subsidiary of the Company (the “Merger”). Cavium is a provider of highly integrated semiconductor processors that enable intelligent processing for wired and wireless infrastructure and cloud for networking, communications, storage and security applications. The Merger is primarily intended to create an opportunity for the combined company to emerge as a leader in infrastructure solutions. Pursuant to the Merger Agreement, the Company will issue 2.1757 common shares and pay $40.00 per share in cash, without interest, for each share of Cavium common stock. The exchange ratio was based on a purchase price of $80 per share, using the Company's undisturbed price prior to November 3, when media reports of the transaction first surfaced. This represents a transaction value of approximately $6 billion. The merger consideration will be financed by a mix of cash, new debt financing and issuance of the Company’s common stock. The Company intends to fund the cash consideration with a combination of cash on hand from the combined companies and $1.75 billion in debt financing. The Company has obtained commitments consisting of an $850 million bridge loan commitment and a $900 million committed term loan from Goldman Sachs Bank USA and Bank of America Merrill Lynch, in each case subject to customary terms and conditions. In addition, in connection with the Merger, the Company plans to obtain a $500 million revolving credit facility, borrowings under which will be used for general corporate purposes of the Company and its subsidiaries. The transaction is not subject to any financing condition. The Company has recorded $17.6 million of associated deferred debt and equity financing costs on the accompanying consolidated balance sheet as of February 3, 2018. The transaction is expected to close in mid-calendar 2018, subject to customary closing conditions, including, without limitation: (i) the required approval by Cavium shareholders and the Company’s shareholders, which was obtained on March 16, 2018; (ii) the expiration or early termination of the waiting period applicable to the consummation of the Merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, which expired on January 26, 2018, (iii) the receipt of Committee on Foreign Investment in the U.S. ("CFIUS") approval, and (iv) the receipt of certain other foreign regulatory approvals. In certain circumstances, a termination fee of up to $180 million may be payable by the Company or Cavium upon termination of the transaction, as more fully described in the Merger Agreement.

Significant Accounting Policies

12 Months Ended

Feb. 03, 2018

Accounting Policies [Abstract]

Significant Accounting Policies

Discontinued Operations

In connection with the plan the Company announced in November 2016 to restructure its operations to refocus its research and development, increase operational efficiency and improve profitability, the Company also planned to divest certain businesses. As of February 3, 2018, three businesses were divested and are classified as discontinued operations (see "Note 3 - Discontinued Operations"). As required, the Company has retrospectively recast its consolidated statements of operations and balance sheets for all periods presented to reflect these businesses as discontinued operations. The Company has not segregated the cash flows of these businesses in the consolidated statements of cash flows. Management was also required to make certain assumptions and apply judgment to determine historical expenses related to the discontinued operations presented in prior periods. Unless noted otherwise, discussion in the Notes to Consolidated Financial Statements refers to the Company’s continuing operations.

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted 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 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 inter-company 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 an original 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. Time deposits with maturities greater than 90 days, but less than one year, are classified in short-term investments as held-to-maturity since the Company has both the intent and ability to hold them to maturity.

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 can be sold to fund 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

The Company performs a periodic review of its available-for-sale securities to determine whether an other-than-temporary impairment has occurred. Generally, for an individual security that has been in an unrealized loss position for an extended period of time, the Company evaluates whether an impairment charge should be recognized. Its evaluation is based on specific facts and circumstances at the time of assessment, including general market conditions, and the duration and extent to which the fair value is below cost. If the fair value of a debt security is less than its amortized cost, then an other-than-temporary impairment for the difference is recognized if:


•	the Company has the intent to sell the security;


•	it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost base; or


•	a credit loss exists insofar as the Company does not expect to recover the entire recognized amortized cost of the security.

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.

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 (loss) in the consolidated statements of 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 Company’s accounts receivable was concentrated with three customers at February 3, 2018, who represented 22%, 17%, and 16% of gross accounts receivable, respectively, compared with four customers at January 28, 2017, who represented 27%, 15%, 14%, and 11% of gross accounts receivable, respectively. This presentation is at the customer consolidated level.

Historically, a relatively small number of customers have accounted for a significant portion of our net revenue. Net revenue attributable to significant customers whose revenues as a percentage of net revenue was 10% or greater of total net revenues is presented in the following table:



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Customer:
Western Digital*	20	%	21	%	19	%
Toshiba	14	%	14	%	**%
Seagate	11	%	9	%	14	%
Distributor:
Wintech	10	%	10	%	**%

* The percentage of net revenues reported for Western Digital for fiscal year 2018 and fiscal year 2017 includes net revenue of SanDisk, which became a subsidiary of Western Digital in fiscal 2017.
** Less than 10% of 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 net realizable value, 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 net realizable 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. Inventoriable 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 3 to 7 years for machinery and equipment, and 3 to 4 years for 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 over 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 on the last business day of the fiscal fourth quarter and whenever events or changes in circumstances indicate the carrying amount of goodwill may not be recoverable. The Company first 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 or the Company may determine to proceed directly to the quantitative impairment test.

If the Company assesses qualitative factors and concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount or if the Company determines not to use the qualitative assessment, then a quantitative impairment test is performed. The quantitative impairment test requires comparing the fair value of the reporting unit to its net book value, including goodwill. The Company has identified that its business operates as a single operating segment with two components (Storage, and Networking & Connectivity), which it has concluded can be aggregated into a single reporting unit for purposes of testing goodwill impairment. As part of a restructuring announced in November 2016 (see “Note 4 - Restructuring and Other Related Charges”), the former Smart Networked Devices and Solutions component was renamed Networking & Connectivity. An impairment exists if the fair value of the reporting unit is lower than its net book value. If the carrying value of the reporting unit is lower than its net book value, then the Company would record an impairment loss for the difference in the fiscal quarter in which the determination is made.

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 undiscounted 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 9 — Goodwill and Acquired Intangible Assets, Net” 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 exchange 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. If the Company grants extended payment terms greater than its standard terms for a customer such that collectability is not assured, the revenue is deferred upon shipment and will be recognized when the payment becomes due provided all other revenue recognition criteria have been satisfied.

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 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 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. The Company recorded $0.2 million, $0.5 million and $5.1 million of advertising costs for fiscal 2018, 2017 and 2016, respectively, included in selling and marketing expenses in the consolidated statement of operations.

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 awards under the straight-line attribution method over the vesting period. Share-based compensation expense for performance-based awards is recognized when it becomes probable that the performance conditions will be met. Once it becomes probable that a performance-based award will vest, the Company recognizes compensation expense equal to the number of shares expected to vest multiplied by the fair value of the award at the grant date, which is amortized using the accelerated method. In the case of performance-based awards based on total shareholder return (“TSR”), share-based compensation expense is amortized over the requisite service period. For stock purchase rights under the stock purchase plan, the Company amortizes share-based compensation expense ratably over the two-year offering period.

The Company estimates the fair value of time-based stock option and stock purchase awards on the date of grant using the Black Scholes option-pricing model. The fair value of TSR awards is estimated on the date of grant using a Monte Carlo simulation model since the award is indexed to the price of the Company’s common stock as set forth under the terms of the award. The value of the portion of the awards that is ultimately expected to vest is recognized as expense over the requisite service period. The Black Scholes and Monte Carlo models incorporate various highly subjective assumptions including expected term of awards, expected future stock price volatility, expected dividend yield and risk-free interest rate.

In developing estimates used to calculate assumptions, the Company establishes the expected term for employee stock options based on historical settlement experience and after giving consideration to vesting schedules. Assumptions for stock option exercises are stratified by two employee groups and one employee/non-employee group with sufficiently distinct behavior patterns. Expected volatility was developed based on historical stock price volatility. The expected dividend yield is calculated by dividing annualized dividend payments by the closing stock price on the grant date of the option.

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.

Forfeitures are recorded when they occur. Previously recognized expense is reversed for the portion of awards forfeited prior to vesting as and when forfeitures occurred.

Comprehensive Income (Loss)

Comprehensive income (loss), net of tax is comprised of net income and net change in unrealized gains and losses, on available-for-sale securities, auction rate securities and cash flow hedges. Accumulated other comprehensive income (loss), as presented on the accompanying consolidated balance sheets, consists of net unrealized gains and losses on available-for-sale 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.

Using available evidence and judgment, the Company establishes a valuation allowance for deferred tax assets, when it is determined that it is more likely than not that they will not be realized. Valuation allowances have been provided primarily against the U.S. research and development credits. Valuation allowances have also been provided against certain acquired operating losses and the deferred tax assets of foreign subsidiaries. A change in the assessment of the realization of deferred tax assets may materially impact the Company’s tax provision in the period in which a change of assessment occurs.

The Company is subject to income tax audits by the respective tax authorities in each jurisdiction 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.

Warranty

The Company’s products are generally subject to warranty, which provides for the estimated future costs of repair or replacement upon shipment of the product. The Company’s products carry a standard one-year 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. Warranty expenses were not material in fiscal 2018, 2017 and 2016.

Recent Accounting Pronouncements

Accounting Pronouncements Recently Adopted

In July 2015, the FASB issued an amendment to its guidance regarding the subsequent measurement of inventory. Historically, inventory was measured at the lower of cost or market. Market could be replacement cost, net realizable value or net realizable value less an approximately normal profit margin. Under the amended guidance, inventory is to be measured at the lower of cost or net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. This amendment applies to inventories for which cost is determined by methods other than last-in first-out and the retail inventory method. This standard was effective for annual and interim reporting periods beginning after December 15, 2016. Adoption of this guidance on a prospective basis in the Company's first quarter of fiscal 2018 did not have a material effect on the consolidated financial statements.

In March 2016, the FASB issued new guidance that simplifies several aspects of the accounting for share-based payment award transactions, including the accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as classification in the statement of cash flows. Under the new guidance, excess tax benefits and tax deficiencies will be recognized in the income statement as they occur. This replaced the previous guidance which requires tax benefits that exceed compensation cost (‘windfalls’) to be recognized in additional paid in capital. It also eliminates the need to maintain a “windfall pool,” and removes the requirement to delay recognizing a windfall until it reduces current taxes payable. The new guidance also changed the cash flow presentation of excess tax benefits, classifying them as operating activities consistent with other cash flows related to income taxes. The guidance was effective for annual and interim reporting periods beginning after December 15, 2016. The adoption of the standard did not have a material effect on the consolidated financial statements in the Company's first quarter of fiscal year 2018. Previously, the Company had disclosed its determination to account for forfeitures based on estimated forfeiture rate. However, based on further analysis of the potential prospective effects on the financial statements, and based on management’s use of such measures in GAAP and non-GAAP financial analysis, the Company subsequently elected to adopt the standard by recognizing forfeitures as incurred. As such, the Company applied the modified retrospective method of adoption for forfeitures in accordance with the guidance and recorded $2.0 million cumulative effect adjustment to retained earnings. The Company elected to adopt the cash flow statement presentation of excess tax benefits on a prospective basis as allowed by the new guidance.

In January 2017, the FASB issued guidance simplifying the test for goodwill impairment. This guidance eliminates Step 2 from the goodwill impairment test i.e. determining the implied fair value of the reporting unit’s goodwill and comparing it to the carrying value of goodwill, instead requiring an entity to recognize a goodwill impairment charge for the amount by which the goodwill carrying amount exceeds the reporting unit’s fair value. This guidance was effective for interim and annual goodwill impairment tests in fiscal years beginning after December 15, 2019, and early adoption is permitted. This guidance must be applied on a prospective basis. The Company adopted this guidance beginning in the first quarter of fiscal 2018. The adoption of this guidance had no effect on the Company’s consolidated financial statements.

Accounting Pronouncements Not Yet Effective

In May 2014, the FASB issued a new accounting standard on the recognition of revenue from contracts with customers that will supersede nearly all existing revenue recognition guidance under GAAP. The new standard will require an entity to recognize revenue from the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance addresses, in particular, contracts with more than one performance obligation, as well as the accounting for certain costs to obtain or fulfill a contract with a customer, and provides for additional disclosures with respect to revenue and cash flows arising from contracts with customers. Public entities are required to apply the amendments on either a full or modified retrospective basis for annual periods beginning after December 15, 2017 and for interim periods within those annual periods. This update will be effective for the Company beginning in the first quarter of fiscal year 2019. The Company will adopt the standard on a modified retrospective basis, with the cumulative effect recognized in retained earnings at the date of adoption. Based on the Company’s assessment of this accounting standard, a change in revenue recognition timing on its component sales made to distributors will be made in the first quarter of fiscal year 2019. The Company will recognize revenue when the Company transfers control to the distributor rather than deferring recognition until the distributor sells the components. In addition, the Company established appropriate accruals for the variable consideration aspect of sales to distributors, estimated based on historical experience, including estimates for price discounts, price protection, rebates, and stock rotation programs. On the date of initial adoption, the Company will remove the deferred income on component sales made to distributors and record estimates of the accruals for variable consideration through a cumulative adjustment to retained earnings. The Company expects the net impact to the opening balance of retained earnings related to the adoption of the new standard to be in the range of $25.0 million to $40.0 million.

In January 2016, the FASB issued an accounting standard update that changes the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. The accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2019, and early adoption is permitted. The adoption of this guidance will not have a material effect on the Company's consolidated financial statements.

In February 2016, the FASB issued a new standard on the accounting for leases, which requires a lessee to record a right-of-use asset and a corresponding lease liability on the balance sheet for all leases with terms longer than twelve months. The standard also expands the required quantitative and qualitative disclosures for lease arrangements. The standard is effective for the Company beginning in the first quarter of fiscal year 2020. The Company is currently evaluating the effect this new guidance will have on its consolidated financial statements.

In June 2016, the FASB issued a new standard requiring financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The standard eliminates the threshold for initial recognition in current GAAP and reflects an entity’s current estimate of all expected credit losses. The measurement of expected credit losses is based on historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the financial assets. The standard is effective for the Company beginning in the first quarter of fiscal year 2021. The Company does not expect the adoption of this guidance will have a material effect on its consolidated financial statements.

In August 2016, the FASB issued an accounting standards update to add or clarify guidance on the classification of certain cash receipts and cash payments in the statement of cash flows. The amendments in the update provide guidance on eight specific cash flow issues and is effective for the Company beginning in the first quarter of fiscal year 2019. Early adoption is permitted, including adoption in an interim period. The amendments to the guidance should be applied using a retrospective transition method for each period presented and, if it is impracticable to apply all of the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.

In October 2016, the FASB issued new guidance that simplifies the accounting for the income tax effects of intra-entity transfers and will require companies to recognize the income tax effects of intra-entity transfers of assets other than inventory when the transfer occurs. Previous guidance required companies to defer the income tax effects of intra-entity transfers of assets until the asset had been sold to an outside party or otherwise recognized. The guidance is effective for the Company beginning in the first quarter of fiscal year 2019. The adoption of this guidance will not have a material effect on the Company's consolidated financial statements.

In November 2016, the FASB issued new guidance that requires entities to include in their cash and cash-equivalent balances in the statement of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents. As a result, companies will no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. The guidance is effective for the Company beginning in the first quarter of fiscal year 2019. The adoption of this guidance will not have a material effect on the Company's consolidated financial statements.

In January 2017, the FASB issued an accounting standards update that revises the definition of a business. The amendments provide a more robust framework for determining when a set of assets and activities is a business. The update is intended to help companies evaluate whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The guidance is effective for annual and interim periods beginning after December 15, 2018. Early adoption is permitted for certain transactions, as specifically described in the guidance. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.

In May 2017, the FASB issued an accounting standards update that provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Unless the changes in terms or conditions meet all three criteria outlined in the guidance, modification accounting should be applied. The three criteria relate to changes in the terms and conditions that affect the fair value, vesting conditions, or classification of a share-based payment award. The amendment is effective for the Company beginning in the first quarter of fiscal year 2019. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.

In August 2017, the FASB issued an accounting standards update that simplifies the application and administration of hedge accounting. The guidance amends the presentation and disclosure requirements and changes how companies assess effectiveness. The guidance is intended to more closely align hedge accounting with companies' risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. The guidance is effective for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. The guidance will be applied to cash flow and net investment hedge relationships that exist on the date of adoption using a modified retrospective approach. The presentation and disclosure requirements will be applied prospectively. The Company is evaluating the effect this new guidance will have on its consolidated financial statements.

Discontinued Operations

12 Months Ended

Feb. 03, 2018

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

In November 2016, the Company announced a plan to restructure its operations to refocus its research and development, increase operational efficiency and improve profitability. As part of these actions, the Company began an active program to locate buyers for several businesses. The Company concluded that the divestitures of these businesses represented a strategic shift that has a major effect on the Company’s operations and financial results. These businesses were deemed not to align with the Company’s core business. The Company classified these businesses as discontinued operations for all periods presented in its consolidated financial statements.

In February 2017, the Company entered into an agreement to sell the assets of one of these businesses, the Broadband operations. The transaction closed on April 4, 2017. Based on the terms of the agreement, the Company received sale consideration of $23.0 million in cash proceeds. The divestiture resulted in a pre-tax gain on sale of $8.2 million, which is included in income from discontinued operations in the consolidated statements of operations.

In May 2017, the Company sold the assets of a second business, the LTE thin-modem operations. The transaction closed on May 18, 2017. Based on the terms of the agreement, the Company received sale consideration of $52.9 million. The sale consideration included $3.6 million related to the Company's tax withholding liability paid by the buyer to tax authorities. The divestiture resulted in a pre-tax gain on sale of $34.0 million, which is included in income from discontinued operations in the consolidated statements of operations.

In June 2017, the Company entered into an agreement to sell the assets of a third business, the Multimedia operations. The transaction closed on September 8, 2017. Based on the terms of the agreement, the Company received sale consideration of $93.7 million in cash proceeds. The divestiture resulted in a pre-tax gain on sale of $46.2 million which is included in income from discontinued operations in the consolidated statements of operations.

The following table presents a reconciliation of the carrying amounts of major classes of assets and liabilities of the discontinued operations to the total assets and liabilities of the disposal group classified as held for sale that are presented separately in the consolidated balance sheets (in thousands):



	February 3, 2018		January 28, 2017
Current assets held for sale:
Inventory	$	—	$	9,281
Property and equipment, net	—		5,270
Goodwill	—		36,636
Acquired intangible assets, net	—		3,799
Other	—		1,490
Current assets held for sale for discontinued operations	—		56,476
Other assets held for sale
Property and equipment, net	30,767		601
Total assets of the disposal group classified as held for sale	$	30,767	$	57,077
Current liabilities held for sale:
Deferred Income	$	—	$	5,818
Total liabilities of the disposal group classified as held for sale	$	—	$	5,818

Other assets held for sale as of February 3, 2018 consist of a building and land.

The following table presents a reconciliation of the major financial lines constituting the results of operations for discontinued operations to the net income (loss) from discontinued operations presented separately in the consolidated statement of operations (in thousands):



	Year Ended
	February 3, 2018		January 28, 2017			January 30, 2016
Net revenue	$	94,137	$	115,437		$	123,332
Cost of goods sold	47,499		72,764			88,616
Gross Profit	46,638		42,673			34,716
Operating expenses:
Research and development	34,530		88,538			99,603
Selling, general and administrative	6,925		6,415			6,442
Total operating expenses	41,455		94,953			106,045
Income (loss) from discontinued operations before income taxes	5,183		(52,280		)	(71,329		)
Gain from sale of discontinued operations	88,406		—			—
Provision for income taxes	5,900		1,390			1,630
Net income (loss) from discontinued operations	$	87,689	$	(53,670	)	$	(72,959	)

Non-cash operating amounts reported for discontinued operations include share-based compensation expense of $1.6 million, $12.6 million and $11.0 million in fiscal 2018, 2017 and 2016, respectively. Depreciation, amortization and capital expenditures are not material. The proceeds from sale of the Multimedia business of $93.7 million, proceeds from sale of the LTE thin-modem business of $49.2 million and proceeds from sale of the Broadband business of $23.0 million are classified in investing activities for fiscal 2018, and the gain on sale of such business is presented in operating activities in the consolidated statements of cash flows. Due to the Company's transfer pricing arrangements, the Company generates income in most jurisdictions in which it operates, regardless of a loss that may exist on a consolidated basis. In addition, the Company recognized a tax expense of $0.5 million on the sale of its Multimedia business for fiscal 2018, and a tax expense of $4.5 million on the sale of its LTE thin-modem business for fiscal 2018. As such, the Company has reflected a tax expense of $5.9 million, $1.4 million, and $1.6 million for fiscal 2018, 2017, and 2016, respectively, attributable to discontinued operations.

Restructuring and Other Related Charges

12 Months Ended

Feb. 03, 2018

Restructuring and Related Activities [Abstract]

Restructuring and Other Related Charges

The following table provides a summary of restructuring and other related charges as presented in the Consolidated Statements of Operations (in thousands):



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Cost of goods sold	$	—	$	—	$	10,292
Restructuring related charges	5,250		96,801		53,251
	$	5,250	$	96,801	$	63,543

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



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Severance and related costs	$	8,247		$	32,650		$	43,926
Facilities and related costs	1,692			6,587			1,407
Loss on early contract termination	—			—			1,644
Other exit-related costs	2,082			5,452			534
	12,021			44,689			47,511
Release of reserves:
Severance	(1,612		)	(86		)	—
Facilities and related costs	(258		)	—			—
Other exit-related costs	(340		)	(383		)	—

Impairment and write-off of assets & restructuring (gain):
Prepaid deposit	—			45,000			—
Inventory	—			—			8,046
Technology licenses	174			629			1,250
Equipment and other	(489		)	6,952			6,736
Building sale	(4,246		)	—			—
	$	5,250		$	96,801		$	63,543

Fiscal 2018. The Company recorded $5.3 million of restructuring and other related charges in fiscal 2018 in continuation of the restructuring plan announced in November 2016 as described in Note 3 - Discontinued Operations. Total cumulative charges recorded through the end of fiscal 2018 related to this restructuring action were $95.6 million. As of February 3, 2018, the Company has substantially completed its restructuring actions that were contemplated in the original November 2016 announcement, and does not expect the remaining restructuring charges under this plan to be material.

Fiscal 2017. The Company recorded $96.8 million of restructuring and other related charges in fiscal 2017, which included costs associated with severance, asset impairment, lease termination fees and other costs.

The Company recorded restructuring and other related charges of $90.3 million in fiscal 2017 related to this restructuring plan announced in November 2016. The charges included $32.6 million of severance benefits, $5.5 million of other exit-related costs primarily related to contract cancellation penalties, $1.9 million of costs related to closing certain facilities, $45.0 million to fully impair a nonrefundable deposit due to the non-utilization of the related contract, and $5.4 million for the impairment of equipment and technology licenses.

In connection with the restructuring of its mobile platform business in September 2015, substantially all of the remaining activities expected to be completed in the first half of fiscal 2017 were completed. As a result, the Company recorded a charge of $1.9 million in fiscal 2017, which included $2.2 million primarily for the write off of all remaining mobile-related equipment that was previously classified as held for sale that was offset by a net credit of $0.3 million, mainly due to the release of a reserve related to the loss on contract termination previously recognized in fiscal 2016. Total cumulative charges recorded through the end of fiscal 2018 related to this restructuring action were $46.4 million, which included $28.1 million of severance benefits, a $1.3 million loss on early contract termination, $8.8 million for impairment of technology licenses and certain equipment, $0.2 million related to facility closures and an $8.0 million write down of inventory. The total cumulative charges were lower than the original estimate of $100 million to $130 million primarily due to the Company’s decision to retain approximately 140 mobile employees to support the remaining mobile business than it originally anticipated and certain equipment planned for disposal was subsequently determined to have alternative use. The Company also offered retention bonuses to another 128 mobile employees to remain through the ramp down of certain operations. Their benefit packages were recognized ratably over the employees’ remaining service periods through the first half of fiscal 2017.

In addition to the restructuring actions described in the preceding paragraph, the Company recorded charges of $4.6 million in the fiscal 2017, primarily for the remaining lease obligation, net of sublease income, upon vacating certain floors in one of its Israel facilities and ongoing operating expenses of vacated facilities related to restructuring actions in previous years.

Fiscal 2016. The Company recorded $63.5 million of restructuring and other related charges in fiscal 2016 as described in the following paragraphs.

In September 2015, the Company announced a significant restructuring of its mobile platform business in order to focus the mobile product line on more profitable opportunities and align its expenses with corporate targets. The Company implemented actions to significantly downsize the mobile platform organization to refocus its technology to other emerging opportunities. As a result of these actions, the Company recorded restructuring and other related charges of $44.4 million in fiscal 2016 related to this restructuring. The charge primarily included severance benefits for 825 employees who were notified of their termination, a loss on early contract termination, the impairment of technology licenses and certain equipment, and the write down of inventory. Substantially all of the affected employees departed by the end of fiscal 2016.

In May 2015, the Company decided to further reduce its research and development operations in Israel and close certain other design centers, primarily located in Europe and the U.S. in connection with its ongoing effort to streamline its business. As a result, the Company recorded a total $16.3 million charge in fiscal 2016 comprised of $15.1 million for severance related to the termination of 358 employees who were notified of their termination and $1.2 million for a lease obligation related to a facility that the Company vacated in July 2015. Substantially all of the activities associated with these actions were completed and all affected employees departed before the end of fiscal 2016.

In March 2015, the Company exercised the early buyout option under an existing operating lease for corporate equipment that it planned to sell as part of a cost reduction action. The Company actively sought a buyer and classified the equipment as held for sale within prepaid and current assets on the consolidated balance sheet. It also ceased depreciation on the asset and recorded impairment charges of $1.4 million through the second quarter ended August 1, 2015. In October 2015, the Company sold the corporate equipment for net proceeds of $9.3 million, which approximated the carrying value and resulted in no gain or loss recognized upon the sale of the asset.

In addition to the restructuring actions described in the preceding paragraphs, the Company recorded $1.4 million of additional charges primarily associated with ongoing operating expenses of vacated facilities related to restructuring actions in previous fiscal years and maintenance costs for the corporate equipment sold in October 2015.

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



	November 2016 Restructuring									Mobile & Other Prior Restructuring
	Severance and related costs			Facilities and related costs			Other exit-related costs			Severance and related costs			Facilities and related costs			Other exit-related costs			Total
Balance at January 30, 2016	$	—		$	—		$	—		$	1,155		$	1,043		$	1,644		$	3,842
Restructuring charges - continuing operations	32,635			1,872			5,452			15			4,715			—			44,689
Release of reserves - continuing operations	—			—			—			(86		)	—			(383		)	(469		)
Restructuring charges - discontinued operations	8,385			—			—			—			—			—			8,385
Net cash payments	(24,065		)	(110		)	(829		)	(1,082		)	(5,112		)	(1,261		)	(32,459		)
Exchange rate adjustment	45			1			2			(2		)	65			—			111
Balance at January 28, 2017	17,000			1,763			4,625			—			711			—			24,099
Restructuring charges - continuing operations	8,247			1,692			2,082			—			—			—			12,021
Release of reserves - continuing operations	(1,612		)	(258		)	(340		)	—			—			—			(2,210		)
Restructuring charges - discontinued operations	7,015			9			3,560			—			—			—			10,584
Net cash payments	(29,996		)	(2,744		)	(11,364		)	—			(711		)	—			(44,815		)
Other	—			—			1,992			—			—			—			1,992
Balance at February 3, 2018	654			462			555			—			—			—			1,671
Less: non-current portion	—			(59		)	—			—			—			—			(59		)
Current portion	$	654		$	403		$	555		$	—		$	—		$	—		$	1,612

The remaining severance represents termination benefits determined to have been established under a substantive ongoing benefit arrangement for which payment was considered probable due to the timing of notification to certain additional employee groups after the end of fiscal 2018 and is expected to be paid in fiscal 2019. Severance charges of $7.0 million and $8.4 million for fiscal 2018 and fiscal 2017, respectively, relate to discontinued operations and have been included in income (loss) from discontinued operations, net of tax, in the Company's consolidated statements of operations. Other exit-related costs of $3.6 million for fiscal 2018 relate to discontinued operations and have been included in income (loss) from discontinued operations in the Company's consolidated statements of operations. The balance at February 3, 2018 for facility and related costs includes remaining payments under lease obligations related to vacated space that are expected to be paid through fiscal 2020. Other exit-related costs are expected to be paid in fiscal 2019.

Supplemental Financial Information

12 Months Ended

Feb. 03, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Financial Information

Supplemental Financial Information (in thousands)

Consolidated Balance Sheets



	February 3, 2018		January 28, 2017
Cash and cash equivalents:
Cash	$	620,907	$	651,953
Cash equivalents:
Money market funds	18,503		36,122
Time deposits	65,117		67,000
U.S. government and agency debt	51,589		17,497
Foreign government and agency debt	—		1,500
Municipal debt securities	5,290		8,740
Corporate debt securities	127,076		31,280
Cash and cash equivalents	$	888,482	$	814,092



	February 3, 2018		January 28, 2017
Provision for sales returns and allowances:
Sales returns	$	1,516	$	470
Doubtful accounts	984		914
	$	2,500	$	1,384



	February 3, 2018		January 28, 2017
Inventories:
Work-in-process	$	103,711	$	109,362
Finished goods	66,328		61,480
Inventories	$	170,039	$	170,842

Inventory held by third-party logistics providers is recorded as consigned inventory on the Company’s consolidated balance sheet. The amount of inventory held at third-party logistics providers was $18.7 million and $26.5 million at February 3, 2018 and January 28, 2017, respectively.



	February 3, 2018			January 28, 2017
Property and equipment, net:
Machinery and equipment	$	535,416		$	589,280
Land, buildings, and leasehold improvements	247,675			296,800
Computer software	98,253			99,186
Furniture and fixtures	21,139			23,978
	902,483			1,009,244
Less: Accumulated depreciation	(700,261		)	(765,847		)
Property and equipment, net	$	202,222		$	243,397

The Company recorded depreciation expense of $49.2 million, $82.4 million and $73.8 million for fiscal 2018, 2017 and 2016, respectively.



	February 3, 2018		January 28, 2017
Other non-current assets:
Technology and other licenses	$	87,536	$	53,254
Deferred tax assets	20,633		26,608
Deferred debt and equity financing costs	17,622		—
Investments in privately-held companies	2,200		5,787
Prepaid land use rights	8,588		12,810
Deposits	3,504		3,756
Long-term investments	—		4,615
Other	8,717		11,109
Other non-current assets	$	148,800	$	117,939

Deferred debt and equity financing costs relate to the plan of merger described further in Note 1 - Basis of Presentation. Amortization of technology and other licenses was $34.3 million, $25.5 million and $26.4 million in fiscal 2018, 2017 and 2016, respectively.



	February 3, 2018		January 28, 2017
Accrued liabilities:
Technology license obligations	$	28,488	$	21,905
Accrued royalties	11,860		17,349
Accrued rebates	9,292		26,095
Accrued legal related expenses	13,050		7,727
Unsettled investment trades (1)	4,497		15,371
Restructuring liabilities	1,612		23,150
Other	18,159		31,894
Accrued liabilities	$	86,958	$	143,491

(1) Unsettled investment trades represent amounts owed to third parties for investment purchases for which cash settlement has not occurred.



	February 3, 2018			January 28, 2017
Deferred income:
Deferred revenue	$	81,896		$	87,968
Deferred cost of goods sold	(20,659		)	(23,992		)
Deferred income	$	61,237		$	63,976



	February 3, 2018		January 28, 2017
Other non-current liabilities:
Deferred tax liabilities	$	52,204	$	38,777
Technology license obligations	34,060		14,949
Long-term accrued employee compensation	1,029		4,075
Other	1,463		6,136
Other non-current liabilities	$	88,756	$	63,937

Accumulated other comprehensive income (loss):

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



	Unrealized Gain (Loss) on Marketable Securities (1)			Unrealized Gain (Loss) on Cash Flow Hedges (2)			Total
Balance at January 30, 2016	$	(656	)	$	(139	)	$	(795	)
Other comprehensive income before reclassifications	1,766			1,496			3,262
Amounts reclassified from accumulated other comprehensive loss	(1,911		)	(533		)	(2,444		)
Net current-period other comprehensive income (loss), net of tax	(145		)	963			818
Balance at January 28, 2017	(801		)	824			23
Other comprehensive income (loss) before reclassifications	(1,460		)	2,341			881
Amounts reclassified from accumulated other comprehensive income (loss)	(61		)	(3,165		)	(3,226		)
Net current-period other comprehensive loss, net of tax	(1,521		)	(824		)	(2,345		)
Balance at February 3, 2018	$	(2,322	)	$	—		$	(2,322	)

(1) The amounts of gains (losses) associated with the Company's marketable securities reclassified from accumulated other comprehensive income (loss) are recorded in interest and other income, net.

(2) The amounts of gains (losses) associated with the Company's derivative financial instruments reclassified from accumulated other comprehensive income (loss) are recorded in operating expenses. See "Note 7- Derivative Financial Instruments" for additional information on the affected line items in the consolidated statement of operations.

Consolidated Statements of Operations



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Interest and other income, net:
Interest income	$	17,381		$	13,198		$	15,982
Net realized gain (loss) on investments	(2,777		)	1,500			(1,473		)
Gain on sale of business	5,254			—			—
Currency remeasurement gain (loss)	(28		)	1,746			6,655
Other income (loss)	2,364			946			(2,773		)
Interest expense	(685		)	(368		)	(706		)
	$	21,509		$	17,022		$	17,685

Consolidated Statements of Cash Flows



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Supplemental cash flow information:
Cash paid for interest	$	746	$	363	$	703
Cash paid for income taxes, net	$	11,401	$	17,032	$	13,363
Non-Cash Investing and Financing Activities:
Purchase of software and intellectual property under license obligations	$	59,803	$	27,081	$	13,800
Unsettled trade receivable of available-for-sale securities	$	—	$	7,742	$	53,749
Unsettled trade payable of available-for-sale securities	$	4,497	$	15,371	$	—
Unpaid purchase of property and equipment at end of year	$	5,595	$	2,547	$	9,069
Unpaid repurchases of our common shares	$	—	$	1,499	$	—
Unpaid equity and debt financing costs	$	3,244	$	—	$	—

Investments

12 Months Ended

Feb. 03, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

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



	February 3, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
U.S. government and agency debt	$	248,336	$	49	$	(644	)	$	247,741
Foreign government and agency debt	7,004		—		(17		)	6,987
Municipal debt securities	2,734		—		(6		)	2,728
Corporate debt securities	504,609		469		(1,999		)	503,079
Asset backed securities	42,429		3		(177		)	42,255
Held-to-Maturity:
Time deposits	150,000		—		—			150,000
Total short-term investments	955,112		521		(2,843		)	952,790
Total investments	$	955,112	$	521	$	(2,843	)	$	952,790



	January 28, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
U.S. government and agency debt	$	185,584	$	86	$	(283	)	$	185,387
Foreign government and agency debt	13,425		—		(50		)	13,375
Municipal debt securities	27,916		4		(49		)	27,871
Corporate debt securities	432,603		281		(776		)	432,108
Asset backed securities	45,541		33		(47		)	45,527
Held-to-Maturity:
Time deposits	150,000		—		—			150,000
Total short-term investments	855,069		404		(1,205		)	854,268
Long-term investments:
Available-for-sale:
Auction rate securities	4,615		—		—			4,615
Total long-term investments	4,615		—		—			4,615
Total investments	$	859,684	$	404	$	(1,205	)	$	858,883

Short-term, highly liquid investments of $267.6 million and $162.1 million as of February 3, 2018 and January 28, 2017, respectively, included in cash and cash equivalents on the accompanying consolidated balance sheets are not included in the tables above because the gross unrealized gains and losses were immaterial as the carrying values approximate fair value because of the short term maturity of such investments.

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



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Gross realized gains	$	186		$	2,047		$	1,654
Gross realized losses	(2,963		)	(547		)	(1,923		)
Impairment loss	—			—			(1,204		)
Total net realized gains (losses)	$	(2,777	)	$	1,500		$	(1,473	)

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



	February 3, 2018				January 28, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	554,247	$	553,866	$	423,151	$	423,058
Due between one and five years	400,866		398,924		423,669		422,995
Due over five years	—		—		12,864		12,830
	$	955,113	$	952,790	$	859,684	$	858,883

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 3, 2018
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
U.S. government and agency debt	$	148,538	$	(298	)	$	51,332	$	(346	)	$	199,870	$	(644	)
Foreign government and agency debt	3,993		(1		)	2,994		(16		)	6,987		(17		)
Municipal debt securities	1,969		(6		)	—		—			1,969		(6		)
Corporate debt securities	253,380		(1,514		)	46,805		(485		)	300,185		(1,999		)
Asset backed securities	37,636		(145		)	2,167		(32		)	39,803		(177		)
Total securities	$	445,516	$	(1,964	)	$	103,298	$	(879	)	$	548,814	$	(2,843	)



	January 28, 2017
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
U.S. government and agency debt	$	94,064	$	(283	)	$	—	$	—		$	94,064	$	(283	)
Foreign government and agency debt	11,875		(48		)	1,499		(2		)	13,374		(50		)
Municipal debt securities	17,450		(47		)	1,248		(2		)	18,698		(49		)
Corporate debt securities	199,382		(751		)	16,063		(25		)	215,445		(776		)
Asset backed securities	16,754		(47		)	—		—			16,754		(47		)
Total securities	$	339,525	$	(1,176	)	$	18,810	$	(29	)	$	358,335	$	(1,205	)

Derivative Financial Instruments

12 Months Ended

Feb. 03, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

The Company manages some of its foreign currency exchange rate risk through the purchase of foreign currency exchange contracts that hedge against the short-term effect of currency fluctuations. The Company’s policy is to enter into foreign currency forward contracts with maturities less than 12 months that mitigate the effect of rate fluctuations on certain local currency denominated operating expenses. All derivative instruments are recorded at fair value in either prepaid expenses and other current assets or accrued liabilities. The Company reports cash flows from derivative instruments in cash flows from operating activities. The Company uses quoted prices to value its derivative instruments. There were no outstanding forward contracts at the year ended February 3, 2018. The notional amounts of outstanding forward contracts was $63.5 million at January 28, 2017 and consisted of Israeli shekel buy contracts.

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

The following table provides information about gains (losses) associated with our derivative financial instruments (in thousands):



	Location of Gains (Losses) in Statement of Operations	Amount of Gains (Losses) in Statement of Operations for the Year Ended
	Location of Gains (Losses) in Statement of Operations	February 3, 2018		January 28, 2017		January 30, 2016
Derivatives designated as cash flow hedges:
Forward contracts:	Research and development	$	3,223	$	737	$	(390	)
	Selling, general and administrative	723		101		(31		)
		$	3,946	$	838	$	(421	)

The amounts of gains (losses) associated with the Company's derivative financial instruments reclassified from accumulated other comprehensive income (loss) are presented in the following table (in thousands):



	Year Ended
Affected Line Item in the Statement of Operations	February 3, 2018		January 28, 2017		January 30, 2016
Operating costs and expenses:
Cash flow hedges:
Research and development	$	2,564	$	467	$	48
Selling, general and administrative	601		66		16
Total	$	3,165	$	533	$	64

The portion of gains (losses) excluded from the assessment of hedge effectiveness is included in interest and other income, net, were not material in fiscal 2018, 2017 and 2016. The Company did not have hedge ineffectiveness from derivative financial instruments in fiscal 2018, 2017 and 2016. No cash flow hedges were terminated as a result of forecasted transactions that did not occur.

Fair Value Measurements

12 Months Ended

Feb. 03, 2018

Fair Value Disclosures [Abstract]

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 — Other inputs that are directly or indirectly observable in the marketplace.

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

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

The Company’s Level 1 assets include institutional money-market funds that are classified as cash equivalents and marketable investments in U.S. government and agency debt, which are valued primarily using quoted market prices. The Company’s Level 2 assets include its marketable investments in time deposits, corporate debt securities, foreign government and agency debt, municipal debt securities and asset backed securities as the market inputs used to value these instruments consist of market yields, reported trades and broker/dealer quotes, which are corroborated with observable market data. In addition, forward contracts, and the severance pay fund are classified as Level 2 assets as the valuation inputs are based on quoted prices and market observable data of similar instruments. The Company’s investments in auction rate securities are classified as Level 3 assets 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 discounted cash flow model are unobservable in the market.

The tables below set forth, by level, the Company’s assets and liabilities that are measured at fair value on a 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):



	Fair Value Measurements at February 3, 2018
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	18,503	$	—	$	—	$	18,503
Time deposits	—		65,117		—		65,117
U.S. government and agency debt	51,589		—		—		51,589
Municipal debt securities	—		5,290		—		5,290
Corporate debt securities	—		127,076		—		127,076
Short-term investments:
Time deposits	—		150,000		—		150,000
U.S. government and agency debt	247,741		—		—		247,741
Foreign government and agency debt	—		6,987		—		6,987
Municipal debt securities	—		2,728		—		2,728
Corporate debt securities	—		503,079		—		503,079
Asset backed securities	—		42,255		—		42,255
Other non-current assets:
Severance pay fund	—		896		—		896
Total assets	$	317,833	$	903,428	$	—	$	1,221,261



	Fair Value Measurements at January 28, 2017
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	36,122	$	—	$	—	$	36,122
Time deposits	—		67,000		—		67,000
U.S. government and agency debt	17,497		—		—		17,497
Foreign government and agency debt	—		1,500		—		1,500
Municipal debt securities	—		8,740		—		8,740
Corporate debt securities	—		31,280		—		31,280
Short-term investments:
Time deposits	—		150,000		—		150,000
U.S. government and agency debt	185,387		—		—		185,387
Foreign government and agency debt	—		13,375		—		13,375
Municipal debt securities	—		27,871		—		27,871
Corporate debt securities	—		432,108		—		432,108
Asset backed securities	—		45,527		—		45,527
Prepaid expenses and other current assets:
Foreign currency forward contracts	—		735		—		735
Long-term investments:
Auction rate securities	—		—		4,615		4,615
Other non-current assets:
Severance pay fund	—		736		—		736
Total assets	$	239,006	$	778,872	$	4,615	$	1,022,493
Liabilities
Accrued liabilities:
Foreign currency forward contracts	$	—	$	58	$	—	$	58

The following table summarizes the change in fair values for Level 3 assets for the years ended February 3, 2018 and January 28, 2017 (in thousands):



	Level 3
Changes in fair value during the year (pre-tax):
Balance at January 30, 2016	$	11,296
Sales, redemption and settlement	(6,681		)
Unrealized gain included in accumulated other comprehensive income	—
Balance at January 28, 2017	4,615
Sales, redemption and settlement	(4,550		)
Realized loss	(65		)
Balance at February 3, 2018	$	—

There were no transfers of assets between levels in either fiscal 2018 or 2017.

- Definition

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

+ References + Details

Goodwill and Acquired Intangible Assets, Net

12 Months Ended

Feb. 03, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Acquired Intangible Assets, Net

Goodwill

The Company has identified that its business operates as a single operating segment with two components that it has concluded can be aggregated into a single reporting unit. In connection with the restructuring plan the Company announced in November 2016 (see “Note 4 - Restructuring and Other Related Charges”), its Board of Directors approved a plan to sell certain businesses that are classified and reported in the consolidated statement of operations as discontinued operations. As a result, goodwill was allocated to these businesses based on relative fair value since each represents a portion of the Company’s reporting unit (see "Note 3 - Discontinued Operations"), and was eliminated upon divestiture in fiscal year 2018. The Company’s annual test for goodwill impairment as of the last day of the fourth quarter of fiscal 2018 did not result in any impairment charge.

There was no activity from acquisitions recorded to goodwill in fiscal 2018 and 2017. There was activity from divestitures that affected goodwill in fiscal 2018 and 2017 as described above.

Acquired Intangible Assets, Net

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



		February 3, 2018							January 28, 2017
	Range of Useful Lives	Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amounts		Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amounts
Total acquired intangible assets from continuing operations, net:
Purchased and core technology	4 - 8 years	$	25,798	$	(25,798	)	$	—	$	25,798	$	(22,227	)	$	3,571

Intangible assets, along with the related accumulated amortization, are removed from the table above after the end of the fiscal year they become fully amortized. The entire gross value of the acquired intangible assets were fully amortized as of February 3, 2018, and the Company did not acquire any intangibles during fiscal year 2018.

- Definition

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

+ References + Details

Commitments and Contingencies

12 Months Ended

Feb. 03, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Warranty Obligations

The Company’s products carry a standard one-year 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 2018, 2017, and 2016 was approximately $16.8 million, $23.7 million and $23.8 million, respectively. The Company also purchases certain intellectual property under technology license obligations. Future minimum lease payments, net of estimated sublease income, and payments under technology license obligations as of February 3, 2018, are presented in the following tables (in thousands):



Fiscal Year	Minimum Operating Lease Payments
2019	$	27,200
2020	20,918
2021	8,688
2022	7,880
2023	7,729
Thereafter	5,451
Total future minimum lease payments	$	77,866



Fiscal Year	Technology License Obligations
2019	$	34,250
2020	29,605
2021	7,358
Total future minimum lease payments	$	71,213
Less: amount representing interest	(1,493		)
Present value of future minimum payments	69,720
Less: current portion	(25,998		)
Non-current portion	$	43,722

Technology license obligations include the liabilities under 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 is allowed but requires payment of all costs and expenses incurred through the date of cancellation. As of February 3, 2018, these foundries had incurred approximately $145.6 million of manufacturing costs and expenses relating to the Company’s outstanding purchase orders.

Intellectual Property Indemnification

The Company has agreed to indemnify certain customers for claims made against the Company’s products where such claims allege infringement of third-party intellectual property rights, including, but not limited to, patents, registered trademarks, and/or copyrights. Under the aforementioned indemnification clauses, the Company may be obligated to defend the customer and pay for the damages awarded against the customer as well as the attorneys’ fees and costs under an infringement claim. 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 and claims, including those noted in this section. The legal proceedings and claims described below could result in substantial costs and could divert the attention and resources of the Company’s management. The Company is also engaged in other legal proceedings and claims not described below, which arise in the ordinary course of its business. The Company is currently unable to predict the final outcome of these proceedings and claims and therefore cannot determine the likelihood of loss or estimate a range of possible loss, except with respect to amounts where it has determined a loss is both probable and estimable and has made an accrual. Litigation is subject to inherent uncertainties and unfavorable rulings could occur. An unfavorable ruling in litigation, particularly patent 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. 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.

Luna Litigation and Consolidated Cases. On September 11, 2015, Daniel Luna filed an action asserting putative class action claims on behalf of the Company’s shareholders in the United States District Court for the Southern District of New York (“S.D. of New York”). This action was consolidated with two additional, nearly identical complaints subsequently filed by Philip Limbacher and Jim Farno. The complaints asserted violations of federal securities laws based on allegations that the Company and certain of its officers and directors (Sehat Sutardja, Michael Rashkin, and Sukhi Nagesh) made, caused to be made, or failed to correct false and/or misleading statements in the Company’s press releases and public filings. The complaints request damages in unspecified amounts, costs and fees of bringing the action, and other unspecified relief.

On November 18, 2015, the S.D. of New York granted the Company’s motion to transfer the consolidated cases to the N.D. of California. On December 21, 2015, the N.D. of California granted the Company’s motion to deem the consolidated cases related to the Saratoga litigation, discussed below. On February 8, 2016, the N.D. of California granted an unopposed motion to appoint Plumbers and Pipefitters National Pension Fund as Lead Plaintiff. On March 19, 2016, Lead Plaintiff filed a consolidated amended complaint. On April 29, 2016, Marvell and each of the individual defendants each filed motions to dismiss. The hearing on the motions to dismiss took place on July 29, 2016 and the court took the matter under submission. On October 12, 2016, the Court granted Defendants’ motions to dismiss with leave to amend and granted lead plaintiff 30 days to file an amended complaint. The parties agreed that the plaintiffs shall file and serve an amended complaint by November 28, 2016. Plaintiffs filed and served the amended complaint on November 28, 2016. The Initial Case Management Conference took place on January 12, 2017. Marvell and co-defendants filed separate Motions to Dismiss on January 17, 2017. A hearing on the Motion to Dismiss took place on May 4, 2017 and, on May 17, 2017, the Court granted the Motion to Dismiss as to Rashkin and Nagesh and denied the Motion to Dismiss as to Sutardja and Marvell. On August 2, 2017, Lead Plaintiff filed a motion for class certification. On October 27, 2017, after a hearing on October 26, 2017, the Court certified a class of persons or entities that acquired Marvell stock during the period from February 19, 2015 to December 7, 2015. The Court set a deadline of December 29, 2017 for the conclusion of fact discovery.

In early December 2017, an initial proposal for a monetary settlement of the case was tendered to the Company by plaintiffs' counsel. Negotiations regarding the conditions of a proposed settlement continued until December 19, 2017 when Lead Plaintiff Plumbers and Pipefitters National Pension Fund and the remaining defendants entered into a written settlement agreement that is subject to the Court’s approval and provides for class-wide releases in exchange for a payment by the Company of $72.5 million, which the Company placed into escrow in connection with the Court’s preliminary approval of the class settlement. In the settlement agreement, the defendants expressly deny all charges of wrongdoing or liability against them arising out of any of the conduct alleged in the litigation and state that they determined that having taken into account the uncertainty and risks inherent in any litigation, especially in complex cases such as this, it is desirable and beneficial to them that the litigation be fully and finally settled. The settlement agreement was preliminarily approved by the Court on December 21, 2017, and the final settlement approval hearing has been scheduled for April 17, 2018. The settlement amount plus associated legal fees totaling $74.4 million is included in "Litigation settlement" in the accompanying consolidated statement of operations as of the fiscal year ended February 3, 2018.

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.

Carnegie Mellon University Settlement

In February 2016, the Company and CMU settled their patent infringement lawsuit pursuant to a court-ordered mediation and entered into a Settlement Agreement and Patent License (the “Agreement”). The parties agreed to mutual release of claims, license and covenant not to sue provisions for which the Company paid an aggregate of $750 million to CMU in fiscal 2017.

The Agreement was accounted for as a multiple-element arrangement and accordingly, a valuation was completed to determine the estimated fair value of each identifiable element. As a result, the Company allocated $654.7 million to the mutual release of claims and covenant not to sue provisions; $81.3 million to the licensing of intellectual property in fiscal 2016; and the remaining $14.0 million representing the future use of the license through April 2018.

The $654.7 million for the mutual release of claims and covenant not to sue was recorded in fiscal 2016 as a settlement charge in operating expenses since there is no future benefit. The $81.3 million license fee was recorded in fiscal 2016 as a charge in cost of goods sold for past use of the license. The $14.0 million representing the future use of the license, is to be recognized in cost of goods sold over the remaining term of the license from February 2016 through April 2018. Accordingly, the Company recorded $6.2 million to cost of goods sold in fiscal 2017.

Shareholders' Equity

12 Months Ended

Feb. 03, 2018

Equity [Abstract]

Shareholders' Equity

Shareholders’ Equity

(a) Preferred and Common Stock

Under the terms of the Company’s Articles of Association, the Board of Directors may determine the rights, preferences, and terms of the Company’s authorized but unissued shares of preferred stock.

As of February 3, 2018, the Company is authorized to issue 8.0 million shares of $0.002 par value preferred stock and 992.0 million shares of $0.002 par value common stock. As of February 3, 2018 and January 28, 2017, no shares of preferred stock were outstanding.

(b) Restricted Stock Unit Withholdings

For the years ended February 3, 2018 and January 28, 2017, the Company withheld approximately 1.7 million and 1.7 million shares, or $26.8 million and $16.7 million, of common stock, respectively, in settlement of employee tax withholding obligations due upon the vesting of restricted stock.

During fiscal 2018, the Company declared and paid cash dividends of $0.24 per common share, or $119.3 million, on the Company’s outstanding common stock. During fiscal 2017, the Company declared and paid cash dividends of $0.24 per common share, or $122.3 million, on the Company’s outstanding common stock.

Any future dividends will be subject to the approval of the Company's Board of Directors.

On March 15, 2018, the Company announced that its board of directors declared a cash dividend of $0.06 per share payable on April 18, 2018 to shareholders of record as of March 29, 2018.

(d) Stock Repurchase Program

On November 17, 2016, the Company announced that its Board of Directors authorized a $1.0 billion share repurchase plan. The newly authorized stock repurchase program replaced in its entirety the prior $3.25 billion stock repurchase program. 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 31.5 million of its common shares for $526.1 million, 13.3 million of its common shares for $183.1 million, and 19.7 million of its common shares for $260.9 million in cash during fiscal 2018, 2017 and 2016, respectively. The repurchased shares were retired immediately after the repurchases were completed. The Company records all repurchases, as well as investment purchases and sales, based on their trade date. As of February 3, 2018, a total of 286.4 million shares have been repurchased to date under the Company’s share repurchase program for a total $3.8 billion in cash and there was $358.0 million remaining available for future share repurchases.

A summary of the stock repurchase activity under the stock repurchase program, reported based on the trade date, is summarized as follows (in thousands, except per-share amounts):



	Shares Repurchased	Weighted- Average Price per Share		Amount Repurchased
Cumulative balance at January 31, 2015	221,901	$	12.65	$	2,806,543
Repurchase of common stock under the stock repurchase program (1)	19,700	$	13.24	260,875
Cumulative balance at January 30, 2016	241,602	$	12.70	3,067,418
Repurchase of common stock under the stock repurchase program (2)	13,303	$	13.76	183,064
Cumulative balance at January 28, 2017	254,904	$	12.75	3,250,481
Repurchase of common stock under the stock repurchase program (3)	31,460	$	16.72	526,075
Cumulative balance at February 3, 2018	286,365	$	13.19	$	3,776,557

(1) There were no stock repurchases pending settlement as of January 30, 2016.

(2) Includes stock repurchases of $1.5 million, which were pending settlement as of January 28, 2017.

(3) There were no stock repurchases pending settlement as of February 3, 2018.

Employee Benefit Plans

12 Months Ended

Feb. 03, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Employee Benefit Plans

(a) Employee Stock Compensation Plans

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 3, 2018. 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. The Company can also grant stock awards, which may be subject to vesting. Further, the Company can grant restricted stock unit (“RSU”) awards. RSU 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. Awards under the Option Plan generally vest over 2 to 5 years.

As of February 3, 2018, approximately 96.5 million shares remained available for future grants under the Option Plan.

The Company grants performance-based equity awards to each of its executive officers when they join the Company, and as an annual refresh grant to all executive officers in April of each fiscal year. These equity awards include RSU’s which vest based on the achievement of certain financial goals (“Financial Performance RSU”). The Financial Performance RSUs have a three year service requirement. The number of shares to be earned can be 0% to 200% of target and is based on the achievement of certain financial operating metrics to be measured as of the end of the second fiscal year of the three year vesting term. Shares granted under these Financial Performance RSUs are reported in the table presented below as “Performance-Based” based on 100% expected achievement.

The executive officers are also granted equity awards at date of hire and annually, usually in April, as part of the above-mentioned refresh grant program. The number of shares to be earned can be 0% to 150% of target and is based on the achievement of performance objectives relating to relative total shareholder return of the Company’s common shares as compared to that of comparable companies of the Philadelphia Semiconductor Sector Index over a performance period defined in the award. The Total Shareholder Return Awards have a three year service requirement. These Total Shareholder Return Awards are reported in the table presented below as “Market-Based” based on 100% expected achievement.

In December 2017, the Company’s Executive Compensation Committee approved a deferred stock program, whereby executives of the Company have the option, beginning in 2018, to defer the settlement of time-based and performance-based stock units granted under the 1995 Stock Option Plan to a future date. A deferral election is irrevocable after the annual submission deadline. The shares of common stock underlying the deferred RSUs will be distributed at the earliest of the employee’s specified future settlement date, not to be earlier than 2023, or upon separation from service, a change in control, or death or disability. As of February 3, 2018, no executives had elected deferral.

Outside Director Equity Compensation Policy

In September 2016, the Company’s Board of Directors approved the termination of the 2007 Directors’ Stock Incentive Plan, (“2007 Director Plan”) that was initially adopted in October 2007, and it approved a new Outside Director Equity Compensation Policy that governs the grant of equity awards to non-employee directors under the Option Plan. At the annual general meeting of shareholders held in June 2015, the shareholders approved an amendment to the Option Plan to enable a full range of awards to be granted to non-employee directors. Under the newly adopted Outside Director Compensation Policy, each outside director, upon appointment to fill a vacancy on the board or in connection with election at an annual meeting of shareholders, will be granted an RSU award under the 1995 Stock Option Plan for a number of shares with an aggregate fair market value equal to $220,000 on the grant date. In no event shall an outside director be awarded an annual RSU award for more than 20,000 shares. The RSU award vests 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.

(b) 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.

Under the ESPP, a total of 7.0 million shares were issued in fiscal 2018 at a weighted-average price of $7.49 per share, a total of 2.3 million shares were issued in fiscal 2017 at a weighted-average price of $7.33 per share, and a total of 5.9 million shares were issued in fiscal 2016 at a weighted-average price of $10.00 per share. As of February 3, 2018, there was $30.1 million of unamortized compensation cost related to the ESPP.

As of February 3, 2018, approximately 22.5 million shares remained available for future issuance under the ESPP.

The following table summarizes share-based compensation expense (in thousands):



	Year Ended
	February 3, 2018			January 28, 2017		January 30, 2016
Continuing operations:
Cost of goods sold	$	6,646		$	8,334	$	7,787
Research and development	52,127			74,809		88,897
Selling, general and administrative	26,349			18,257		26,082
Share-based compensation - continuing operations	$	85,122		$	101,400	$	122,766
Discontinued operations:
Cost of goods sold	(11		)	187		129
Research and development	1,458			11,633		9,895
Selling, general and administrative	120			750		989
Share-based compensation - discontinued operations	1,567			12,570		11,013
Total share-based compensation	$	86,689		$	113,970	$	133,779

Share-based compensation capitalized in inventory was $1.3 million at February 3, 2018, $0.9 million at January 28, 2017 and $1.5 million at January 30, 2016.

Upon the termination of certain members of our executive management in April 2016, it was determined that the vesting in certain of their unvested stock awards was no longer probable. As a result, the Company recorded a reversal of the previously recognized related share-based compensation expense in fiscal 2017 of $2.4 million.

(d) Restricted Stock and Stock Unit Awards

A summary of restricted stock unit activity, which includes time-based and performance-based or market-based restricted stock units, is as follows (in thousands, except per-share amounts):



	Time-Based				Performance-Based					Market-Based					Total
	Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value
Balance at January 31, 2015	9,748		$	14.84	1,254			$	14.99						11,002		$	14.85
Granted	5,689		$	12.88	669		*	$	14.08	407		*	$	12.24	6,765		$	12.96
Vested	(5,139	)	$	15.06	(658	)		$	15.15	—			$	—	(5,797	)	$	15.07
Canceled/Forfeited	(1,955	)	$	13.99	(288	)		$	14.39	(54	)		$	12.24	(2,297	)	$	14.00
Balance at January 30, 2016	8,343		$	13.57	977			$	14.43	353			$	12.24	9,673		$	13.61
Granted	9,139		$	9.83	366		*	$	13.91	612			$	11.94	10,117		$	10.11
Vested	(5,490	)	$	13.95	(155	)		$	14.15	—			$	—	(5,645	)	$	13.95
Canceled/Forfeited	(2,067	)	$	10.69	(875	)		$	14.45	(406	)		$	12.39	(3,348	)	$	11.88
Balance at January 28, 2017	9,925		$	10.52	313			$	13.91	559			$	11.80	10,797		$	10.69
Granted	8,154		$	15.33	406		*	$	14.49	409		*	$	15.14	8,969		$	15.28
Vested	(5,653	)	$	10.86	—			$	—	—			—		(5,653	)	$	10.86
Canceled/Forfeited	(2,137	)	$	11.95	(47	)		$	13.99	(47	)		$	14.71	(2,231	)	$	12.05
Balance at February 3, 2018	10,289		$	13.84	672			$	14.25	921			$	13.14	11,882		$	13.81


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

The aggregate intrinsic value of restricted stock units expected to vest as of February 3, 2018 was $266.5 million. The number of restricted stock units that are expected to vest is 11.9 million shares.

As of February 3, 2018, unamortized compensation expense related to restricted stock units was $118.4 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 1.9 years.

(e) Stock Option Awards

Option Plan and Stock Award Activity

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



	Time-Based Options				Market-Based Options				Total
	Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price
Balance at January 31, 2015	47,140		$	13.79	2,232		$	15.43	49,372		$	13.88
Granted	6,170		$	14.13	—		—		6,170		$	14.13
Exercised	(2,225	)	$	9.79	—		—		(2,225	)	$	9.79
Canceled/Forfeited	(10,211	)	$	15.68	(76	)	$	15.43	(10,287	)	$	15.68
Balance at January 30, 2016	40,874		$	13.59	2,156		$	15.43	43,030		$	13.68
Granted	2,104		$	9.99	—		—		2,104		$	9.99
Exercised	(5,558	)	$	10.35	—		—		(5,558	)	$	10.35
Canceled/Forfeited	(12,324	)	$	16.44	(2,156	)	$	15.43	(14,480	)	$	16.29
Balance at January 28, 2017	25,096		$	12.61	—		$	—	25,096		$	12.61
Granted	—		$	—	—		—		—		$	—
Exercised	(10,305	)	$	12.38	—		—		(10,305	)	$	12.38
Canceled/Forfeited	(3,019	)	$	14.33	—		—		(3,019	)	$	14.33
Balance at February 3, 2018	11,772		$	12.36	—		$	—	11,772		$	12.36
Vested or expected to vest at February 3, 2018	11,772		$	12.36

For stock options vested and expected to vest at February 3, 2018, the aggregate intrinsic value was $118.6 million. For stock options exercisable at February 3, 2018, the aggregate intrinsic value was $84.5 million. The aggregate intrinsic value of stock options exercised during fiscal 2018, 2017 and 2016 was $57.0 million, $19.8 million and $9.7 million, respectively. The Company’s closing stock price of $22.43 as reported on the NASDAQ Global Select Market as of February 3, 2018 was used to calculate the aggregate intrinsic value for all in-the-money options.

Outstanding options and exercisable options information by range of exercise prices as of February 3, 2018 was as follows:



				Outstanding Options				Exercisable Options
Range of Exercise Prices				Number of Shares (in Thousands)	Weighted Average Remaining Contractual Term (in Years)	Weighted Average Exercise Price		Number of Shares (in Thousands)	Weighted Average Exercise Price
$	5.70	$	10.47	2,083	3.79	$	8.02	1,463	$	7.32
$	10.76	$	10.76	3,400	5.23	$	10.76	3,398	$	10.76
$	10.80	$	14.35	3,226	6.03	$	13.56	982	$	11.89
$	14.45	$	15.87	2,795	5.66	$	15.46	1,667	$	15.42
$	15.91	$	21.62	268	2.00	$	19.55	264	$	19.60
Total				11,772	5.22	$	12.36	7,774	$	11.55

As of February 3, 2018, the unamortized compensation expense for stock options was $4.5 million. The unamortized compensation expense for options will be amortized on a straight-line basis and is expected to be recognized over a weighted-average period of 0.9 years.

(f) Valuation of Employee Share-Based Awards

The expected volatility for awards granted during fiscal 2018, 2017 and 2016 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 the current annualized dividend 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 stock option award on the date of grant using the Black-Scholes option pricing model:



	Year Ended
	February 3, 2018	January 28, 2017			January 30, 2016
Time-based Stock Options:
Weighted average fair value	N/A	$	2.92		$	3.93
Expected volatility	N/A	40		%	34		%
Expected term (in years)	N/A	5.2			5.4
Risk-free interest rate	N/A	1.3		%	1.6		%
Expected dividend yield	N/A	2.5		%	1.8		%

There were no options granted in fiscal 2018.

The following weighted-average assumptions were used for each respective period to calculate the fair value of common shares to be issued under the ESPP on the date of grant using the Black-Scholes option pricing model:



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Employee Stock Purchase Plan:
Estimated fair value	$	6.03		$	3.83		$	3.24
Expected volatility	30		%	39		%	41		%
Expected term (in years)	1.2			1.2			1.3
Risk-free interest rate	1.6		%	0.7		%	0.6		%
Expected dividend yield	1.1		%	1.9		%	2.4		%

The following weighted-average assumptions were used for each respective period to calculate the fair value of common shares to be issued under Total Shareholder Return performance awards on the date of grant using the Monte Carlo pricing model:



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Total Shareholder Return Awards:
Expected term (in years)	2.9		2.9		2.0
Expected volatility	35	%	36	%	27	%
Average correlation coefficient of peer companies	0.5		0.5		0.4
Risk-free interest rate	1.4	%	0.9	%	0.5	%
Expected dividend yield	1.6	%	2.1	%	1.7	%

The correlation coefficients are calculated based upon the price data used to calculate the historical volatilities and is used to model the way in which each entity tends to move in relation to its peers.

(g) Employee 401(k) 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 currently matches 100% of the first 4% of the employee’s contribution and 50% of the next 2%, up to a $4,000 maximum contribution effective from January 1, 2018. The Company made matching contributions to employees of $4.6 million in fiscal 2018, $4.5 million in fiscal 2017 and $4.9 million in fiscal 2016. As of February 3, 2018, 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. In connection with these plans, the Company made contributions on behalf of employees totaling $12.3 million, $11.8 million and $14.5 million during fiscal 2018, 2017 and 2016, respectively.

Income Taxes

12 Months Ended

Feb. 03, 2018

Income Tax Disclosure [Abstract]

Income Taxes

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



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
U.S. operations	$	24,377	$	30,601	$	32,095
Non-U.S. operations	426,827		116,828		(759,820		)
	$	451,204	$	147,429	$	(727,725	)

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



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Current income tax provision (benefit):
Federal	$	776		$	8,231		$	10,413
State	2			180			83
Foreign	(2,541		)	19,560			(5,876		)
Total current income tax provision (benefit)	(1,763		)	27,971			4,620
Deferred income tax provision (benefit):
Federal	10,136			(5,062		)	(4,355		)
State	83			(12		)	580
Foreign	9,606			49,711			9,871
Total deferred income tax provision (benefit)	19,825			44,637			6,096
Total provision (benefit) for income taxes	$	18,062		$	72,608		$	10,716

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



	February 3, 2018			January 28, 2017
Deferred tax assets:
Federal and California research and other tax credits	$	607,726		$	450,503
Reserves and accruals	16,951			35,887
Share-based compensation	2,493			3,733
Net operating losses	11,816			5,361
Gross deferred tax assets	638,986			495,484
Valuation allowance	(618,353		)	(456,541		)
Total deferred tax assets	20,633			38,943
Total deferred tax liabilities	(52,204		)	(51,112		)
Net deferred tax assets (liabilities)	$	(31,571	)	$	(12,169	)

As presented in the consolidated balance sheets as of February 3, 2018 and January 28, 2017, and in the table above, unrecognized tax benefits have been offset by deferred tax assets for certain net operating losses that are available to be used in the amount of $8.6 million and $7.5 million, respectively.

In the first quarter of fiscal 2018, we adopted the new guidance related to improvements to employee share-based payment accounting, which simplified several aspects of accounting for share-based payment awards including accounting for income taxes. As a result of adopting this new standard, we recognized a deferred tax asset of $123.0 million for U.S. federal and California research tax credits that were attributable to unrecognized excess tax benefits from share-based payment awards. This deferred tax asset was offset by a valuation allowance.

At the end of fiscal 2018, the Company recorded a valuation allowance of $618.4 million which is an increase of $161.8 million from fiscal 2017. The Company provided a full valuation allowance against its federal and various state research and other tax credits which it earns in excess of its current year tax liabilities, as well as a portion against its net operating loss carryforwards in the U.S. federal and California jurisdictions. Based on the available objectively verifiable positive and negative evidence, the Company determined that it is more likely than not that these research and other tax credits and net operating losses will not be realized in the future. The Company also provided a valuation allowance against the deferred tax assets of a portion of its operations in Israel, which has cumulative losses in recent years and is not projecting sufficient future taxable income to realize the benefit of its deferred tax assets.

As of February 3, 2018, the Company had net operating loss carryforwards available to offset future taxable income of approximately $108.4 million, $1.2 million and $5.7 million for foreign, U.S. federal and state of California purposes, respectively. The federal carryforwards will expire in various fiscal years between 2022 and 2028, and the California carryforwards will expire at various fiscal years between 2019 and 2033, if not utilized before these years. The majority of the Company’s non-U.S. losses carry forward indefinitely. For U.S. federal income tax return purposes, the Company had research and other tax credit carryforwards of approximately $286.4 million that expire through fiscal 2038. As of February 3, 2018, the Company had unused California research tax credit carryforwards of approximately $298.3 million, which can be carried forward indefinitely. The Company also has research and other tax credit carryforwards of approximately $24.5 million in other U.S. states that expire through fiscal 2033 due to the statutes of limitation.

The Company consists of a Bermuda parent holding company with various foreign and U.S. subsidiaries. The applicable statutory rate in Bermuda is zero for the Company for fiscal 2018, 2017, and 2016. For purposes of the reconciliation between the provision (benefit) for income taxes at the statutory rate and the effective tax rate, a notional U.S. 33.7% rate for fiscal year 2018, and a notional rate of 35% for fiscal 2017 and 2016 is applied as follows:



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Provision at U.S. notional statutory rate	33.7	%	35.0	%	35.0	%
Difference in U.S. and non-U.S. tax rates	(31.7	)	(26.3	)	(37.1	)
Benefits from utilization of general business credits	(4.8	)	(28.4	)	5.5
Change in valuation allowance	4.7		24.3		(4.4	)
Withholding taxes	—		34.0		—
Tax effects of global restructuring	—		11.4		—
Other	2.1		(0.7	)	(0.5	)
Effective tax rate	4.0	%	49.3	%	(1.5	)%

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



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Unrecognized tax benefits as of the beginning of the period	$	23,793		$	29,139		$	45,197
Increases related to prior year tax positions	—			2,080			304
Decreases related to prior year tax positions	—						(4,334		)
Increases related to current year tax positions	2,776			2,363			4,237
Settlements	—			—			(704		)
Lapse in the statute of limitations	(3,341		)	(6,576		)	(9,739		)
Foreign exchange gain	24			(3,213		)	(5,822		)
Gross amounts of unrecognized tax benefits as of the end of the period	$	23,252		$	23,793		$	29,139

Included in the balances as of February 3, 2018 is $22.1 million of unrecognized tax benefit that would affect the effective income tax rate if recognized. Also, $8.6 million, $7.5 million and $6.3 million of the gross unrecognized tax benefits presented in the table above are offset against deferred tax assets in the consolidated balance sheets as of February 03, 2018, January 28, 2017 and January 30, 2016, respectively.

The amounts in the table above do not include the related interest and penalties. The amount of interest and penalties accrued was approximately $17.2 million as of February 3, 2018, $21.6 million as of January 28, 2017, and $26.4 million as of January 30, 2016. The Company’s policy is to recognize these interest and penalties as a component of income tax expense. The consolidated statements of operations for fiscal 2018, 2017, and 2016 included $2.3 million, $2.7 million, and $4.6 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 3, 2018, the material jurisdictions that are subject to examination include China, Israel, Singapore, Switzerland and the United States for the Company’s fiscal years 2006 through 2017. As of February 3, 2018, several of the Company’s non-U.S. entities are under examination for fiscal years encompassing 2006 and 2017.

For fiscal 2019, 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 $10.5 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 Singapore subsidiary. In October 2004, the Company’s subsidiary in Singapore was granted a second incentive known as the Develop and Expansion Incentive (“DEI”), and in June 2006, the EDB agreed to extend the Pioneer status for 15 years to June 2014. The Company re-negotiated with the Singapore government and in fiscal 2015, they extended the DEI tax credits to the Company until June 2019. In order to retain these tax benefits in Singapore, the Company must meet certain operating conditions relating to, among other things, maintenance of a regional headquarters function, and research and development activities in Singapore. In fiscal 2017 and 2016 tax savings associated with these tax holidays were approximately $0.9 million and $3.0 million, respectively, which if paid would impact the Company’s earnings per share by less than $0.01 per share in fiscal 2017 and 2016. No tax savings was recognized in fiscal 2018.

Under the Israeli Encouragement law of “approved or benefited enterprise,” two branches of Marvell Israel (M.I.S.L) Ltd., 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, subject to various operating and other conditions. Income from the approved or benefited enterprises, with the exception of capital gains, is eligible up to fiscal 2027. There was no such benefit in fiscal 2018, 2017, and 2016.

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, which commenced in February 2007 and expired at the end of fiscal 2016. The fiscal 2016 tax savings associated with this tax holiday was approximately $3.7 million, which provided earnings per share of $0.01 per share in fiscal 2016. No tax savings was recognized in fiscal 2018 or 2017 due to expiration of the tax holiday.

The Tax Cuts and Jobs Act ("2017 Tax Act") was signed into law on December 22, 2017. The 2017 Tax Act significantly revises the U.S. corporate income tax by, among other things, lowering the statutory corporate tax rate from 35% to 21%, eliminating certain deductions, imposing a mandatory one-time tax on accumulated earnings of foreign subsidiaries, introducing new tax regimes, and changing how foreign earnings are subject to U.S. tax. The 2017 Tax Act also enhanced and extended through 2026 the option to claim accelerated depreciation deductions on qualified property. We have not completed our determination of the accounting implications of the 2017 Tax Act on our tax accruals. However, we have reasonably estimated the effects of the 2017 Tax Act and recorded provisional amounts in our financial statements as of February 3, 2018. We recorded an immaterial provisional tax expense for the impact of the 2017 Tax Act, which was primarily comprised of the remeasurement of federal net deferred taxes resulting from the permanent reduction in the U.S. statutory corporate tax rate to 21% from 35%. As we complete our analysis of the 2017 Tax Act, collect and prepare necessary data, and interpret any additional guidance issued by the U.S. Treasury Department, the IRS, and other standard-setting bodies, we may make adjustments to the provisional amounts. Those adjustments may materially impact our provision for income taxes in the period in which the adjustments are made.

The Company’s principal source of liquidity as of February 3, 2018 consisted of approximately $1.8 billion of cash, cash equivalents and short-term investments, of which approximately $1.1 billion was held by foreign subsidiaries (outside Bermuda). Approximately $630 million of this amount held by foreign subsidiaries is related to undistributed earnings which have been indefinitely reinvested outside of Bermuda. These funds are primarily held in China, Israel and the United States. We have plans to use such amounts to fund various activities outside of Bermuda, including working capital requirements, capital expenditures for expansion, funding of future acquisitions or other financing activities. The amount of undistributed earnings of these subsidiaries for which no deferred tax liability has been provided is $430 million. If such funds were needed by the parent company in Bermuda or if the amounts were otherwise no longer considered indefinitely reinvested, we would incur a tax expense of approximately $160 million.

Net Income (Loss) Per Share

12 Months Ended

Feb. 03, 2018

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

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



	Year Ended
	February 3, 2018		January 28, 2017			January 30, 2016
Numerator:
Income (loss) from continuing operations, net of tax	$	433,142	$	74,821		$	(738,441	)
Income (loss) from discontinued operations, net of tax	87,689		(53,670		)	(72,959		)
Net income (loss)	$	520,831	$	21,151		$	(811,400	)
Denominator:
Weighted average shares — basic	498,008		509,738			510,945
Effect of dilutive securities:
Share-based awards	11,659		7,775			—
Weighted average shares — diluted	509,667		517,513			510,945
Income (loss) from continuing operations per share:
Basic	$	0.87	$	0.15		$	(1.45	)
Diluted	$	0.85	$	0.14		$	(1.45	)
Income (loss) from discontinued operations per share:
Basic	$	0.18	$	(0.11	)	$	(0.14	)
Diluted	$	0.17	$	(0.10	)	$	(0.14	)
Net income (loss) per share:
Basic	$	1.05	$	0.04		$	(1.59	)
Diluted	$	1.02	$	0.04		$	(1.59	)

Potential dilutive securities include dilutive common shares from share-based awards attributable to the assumed exercise of stock options, restricted stock units and employee stock purchase plan shares using the treasury stock method. Under the treasury stock method, potential common shares outstanding are not included in the computation of diluted net income per share, if their effect is anti-dilutive.

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



	Year Ended
	February 3, 2018	January 28, 2017	January 30, 2016
Weighted average shares outstanding:
Share-based awards	412	22,642	64,420

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

Segment and Geographic Information

12 Months Ended

Feb. 03, 2018

Segment Reporting [Abstract]

Segment and Geographic Information

The Company operates in one reportable segment — the design, development and sale of integrated circuits. The chief executive officer was identified as the chief operating decision maker (“CODM”) for the years ended February 3, 2018, January 28, 2017 and January 30, 2016. The Company’s CODM is ultimately responsible for and actively involved in the allocation of resources and the assessment of the Company’s 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 direct 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
	February 3, 2018		January 28, 2017		January 30, 2016
Net Revenue:
China	$	1,205,202	$	1,224,032	$	1,471,180
Malaysia	388,469		286,267		302,953
Philippines	270,101		283,345		211,602
Thailand	137,662		113,778		189,299
United States	42,560		51,416		60,119
Others	365,176		342,154		367,344
	$	2,409,170	$	2,300,992	$	2,602,497



	February 3, 2018		January 28, 2017
Property and equipment, net:
United States	$	156,053	$	147,552
Singapore	15,827		54,054
Israel	12,686		12,133
China	10,145		16,484
Others	7,511		13,174
	$	202,222	$	243,397

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Feb. 03, 2018

Valuation and Qualifying Accounts [Abstract]

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS

(in thousands)



	Balance at Beginning of Year		Additions		Deductions			Balance at End of Year
Fiscal year ended February 3, 2018
Allowance for doubtful accounts and sales return reserve	$	1,384	$	2,352	$	(1,236	)	$	2,500
Deferred tax valuation allowance	$	456,541	$	161,812	$	—		$	618,353
Fiscal year ended January 28, 2017
Allowance for doubtful accounts and sales return reserve	$	2,762	$	4,456	$	(5,834	)	$	1,384
Deferred tax valuation allowance	$	424,914	$	31,627	$	—		$	456,541
Fiscal year ended January 30, 2016
Allowance for doubtful accounts and sales return reserve	$	2,112	$	2,614	$	(1,964	)	$	2,762
Deferred tax valuation allowance	$	382,796	$	42,118	$	—		$	424,914

Significant Accounting Policies (Policies)

12 Months Ended

Feb. 03, 2018

Accounting Policies [Abstract]

Basis of Presentation

The Company’s fiscal year is the 52- or 53-week period ending on the Saturday closest to January 31. Accordingly, every fifth or sixth fiscal year will have a 53-week period. The additional week in a 53-week year is added to the fourth quarter, making such quarter consist of 14 weeks. Fiscal 2018 is a 53-week year. Fiscal 2017 and 2016 each had a 52-week period.

Discontinued Operations

Use of Estimates

Principles of Consolidation

Cash and Cash Equivalents

Investments

Impairment of Investments


•	the Company has the intent to sell the security;


•	it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost base; or


•	a credit loss exists insofar as the Company does not expect to recover the entire recognized amortized cost of the security.

Derivative Financial Instruments

Concentration of Credit Risk and Significant Customers



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Customer:
Western Digital*	20	%	21	%	19	%
Toshiba	14	%	14	%	**%
Seagate	11	%	9	%	14	%
Distributor:
Wintech	10	%	10	%	**%

* The percentage of net revenues reported for Western Digital for fiscal year 2018 and fiscal year 2017 includes net revenue of SanDisk, which became a subsidiary of Western Digital in fiscal 2017.
** Less than 10% of net revenue

Inventories

Property and Equipment, Net

Goodwill

Long-Lived Assets and Intangible Assets

Foreign Currency Transactions

Revenue Recognition

Advertising Expense

Advertising costs are expensed as incurred.

Share-Based Compensation

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.

Forfeitures are recorded when they occur. Previously recognized expense is reversed for the portion of awards forfeited prior to vesting as and when forfeitures occurred.

Comprehensive Income (Loss)

Accounting for Income Taxes

Warranty

Recent Accounting Pronouncements

Accounting Pronouncements Recently Adopted

Accounting Pronouncements Not Yet Effective

Significant Accounting Policies (Tables)

12 Months Ended

Feb. 03, 2018

Accounting Policies [Abstract]

Schedule of Net Revenue Attributable to Significant Customers

Net revenue attributable to significant customers whose revenues as a percentage of net revenue was 10% or greater of total net revenues is presented in the following table:



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Customer:
Western Digital*	20	%	21	%	19	%
Toshiba	14	%	14	%	**%
Seagate	11	%	9	%	14	%
Distributor:
Wintech	10	%	10	%	**%

* The percentage of net revenues reported for Western Digital for fiscal year 2018 and fiscal year 2017 includes net revenue of SanDisk, which became a subsidiary of Western Digital in fiscal 2017.
** Less than 10% of net revenue

Discontinued Operations (Tables)

12 Months Ended

Feb. 03, 2018

Discontinued Operations and Disposal Groups [Abstract]

Major Classes of Assets and Liabilities and Results of Operations of Discontinued Operations



	February 3, 2018		January 28, 2017
Current assets held for sale:
Inventory	$	—	$	9,281
Property and equipment, net	—		5,270
Goodwill	—		36,636
Acquired intangible assets, net	—		3,799
Other	—		1,490
Current assets held for sale for discontinued operations	—		56,476
Other assets held for sale
Property and equipment, net	30,767		601
Total assets of the disposal group classified as held for sale	$	30,767	$	57,077
Current liabilities held for sale:
Deferred Income	$	—	$	5,818
Total liabilities of the disposal group classified as held for sale	$	—	$	5,818



	Year Ended
	February 3, 2018		January 28, 2017			January 30, 2016
Net revenue	$	94,137	$	115,437		$	123,332
Cost of goods sold	47,499		72,764			88,616
Gross Profit	46,638		42,673			34,716
Operating expenses:
Research and development	34,530		88,538			99,603
Selling, general and administrative	6,925		6,415			6,442
Total operating expenses	41,455		94,953			106,045
Income (loss) from discontinued operations before income taxes	5,183		(52,280		)	(71,329		)
Gain from sale of discontinued operations	88,406		—			—
Provision for income taxes	5,900		1,390			1,630
Net income (loss) from discontinued operations	$	87,689	$	(53,670	)	$	(72,959	)

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=84176398&loc=SL51724579-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721659-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

Restructuring and Other Related Charges (Tables)

12 Months Ended

Feb. 03, 2018

Restructuring and Related Activities [Abstract]

Summary of Restructuring and Other Related Charges

The following table provides a summary of restructuring and other related charges as presented in the Consolidated Statements of Operations (in thousands):



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Cost of goods sold	$	—	$	—	$	10,292
Restructuring related charges	5,250		96,801		53,251
	$	5,250	$	96,801	$	63,543

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



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Severance and related costs	$	8,247		$	32,650		$	43,926
Facilities and related costs	1,692			6,587			1,407
Loss on early contract termination	—			—			1,644
Other exit-related costs	2,082			5,452			534
	12,021			44,689			47,511
Release of reserves:
Severance	(1,612		)	(86		)	—
Facilities and related costs	(258		)	—			—
Other exit-related costs	(340		)	(383		)	—

Impairment and write-off of assets & restructuring (gain):
Prepaid deposit	—			45,000			—
Inventory	—			—			8,046
Technology licenses	174			629			1,250
Equipment and other	(489		)	6,952			6,736
Building sale	(4,246		)	—			—
	$	5,250		$	96,801		$	63,543

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

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



	November 2016 Restructuring									Mobile & Other Prior Restructuring
	Severance and related costs			Facilities and related costs			Other exit-related costs			Severance and related costs			Facilities and related costs			Other exit-related costs			Total
Balance at January 30, 2016	$	—		$	—		$	—		$	1,155		$	1,043		$	1,644		$	3,842
Restructuring charges - continuing operations	32,635			1,872			5,452			15			4,715			—			44,689
Release of reserves - continuing operations	—			—			—			(86		)	—			(383		)	(469		)
Restructuring charges - discontinued operations	8,385			—			—			—			—			—			8,385
Net cash payments	(24,065		)	(110		)	(829		)	(1,082		)	(5,112		)	(1,261		)	(32,459		)
Exchange rate adjustment	45			1			2			(2		)	65			—			111
Balance at January 28, 2017	17,000			1,763			4,625			—			711			—			24,099
Restructuring charges - continuing operations	8,247			1,692			2,082			—			—			—			12,021
Release of reserves - continuing operations	(1,612		)	(258		)	(340		)	—			—			—			(2,210		)
Restructuring charges - discontinued operations	7,015			9			3,560			—			—			—			10,584
Net cash payments	(29,996		)	(2,744		)	(11,364		)	—			(711		)	—			(44,815		)
Other	—			—			1,992			—			—			—			1,992
Balance at February 3, 2018	654			462			555			—			—			—			1,671
Less: non-current portion	—			(59		)	—			—			—			—			(59		)
Current portion	$	654		$	403		$	555		$	—		$	—		$	—		$	1,612

Supplemental Financial Information (Tables)

12 Months Ended

Feb. 03, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Cash and Cash Equivalents



	February 3, 2018		January 28, 2017
Cash and cash equivalents:
Cash	$	620,907	$	651,953
Cash equivalents:
Money market funds	18,503		36,122
Time deposits	65,117		67,000
U.S. government and agency debt	51,589		17,497
Foreign government and agency debt	—		1,500
Municipal debt securities	5,290		8,740
Corporate debt securities	127,076		31,280
Cash and cash equivalents	$	888,482	$	814,092

Schedule of Provision for Sales Returns and Allowances



	February 3, 2018		January 28, 2017
Provision for sales returns and allowances:
Sales returns	$	1,516	$	470
Doubtful accounts	984		914
	$	2,500	$	1,384

Schedule of Inventories



	February 3, 2018		January 28, 2017
Inventories:
Work-in-process	$	103,711	$	109,362
Finished goods	66,328		61,480
Inventories	$	170,039	$	170,842

Schedule of Property and Equipment, Net



	February 3, 2018			January 28, 2017
Property and equipment, net:
Machinery and equipment	$	535,416		$	589,280
Land, buildings, and leasehold improvements	247,675			296,800
Computer software	98,253			99,186
Furniture and fixtures	21,139			23,978
	902,483			1,009,244
Less: Accumulated depreciation	(700,261		)	(765,847		)
Property and equipment, net	$	202,222		$	243,397

Schedule of Other Non-current Assets



	February 3, 2018		January 28, 2017
Other non-current assets:
Technology and other licenses	$	87,536	$	53,254
Deferred tax assets	20,633		26,608
Deferred debt and equity financing costs	17,622		—
Investments in privately-held companies	2,200		5,787
Prepaid land use rights	8,588		12,810
Deposits	3,504		3,756
Long-term investments	—		4,615
Other	8,717		11,109
Other non-current assets	$	148,800	$	117,939

Schedule of Accrued Liabilities



	February 3, 2018		January 28, 2017
Accrued liabilities:
Technology license obligations	$	28,488	$	21,905
Accrued royalties	11,860		17,349
Accrued rebates	9,292		26,095
Accrued legal related expenses	13,050		7,727
Unsettled investment trades (1)	4,497		15,371
Restructuring liabilities	1,612		23,150
Other	18,159		31,894
Accrued liabilities	$	86,958	$	143,491

Schedule of Deferred Income



	February 3, 2018			January 28, 2017
Deferred income:
Deferred revenue	$	81,896		$	87,968
Deferred cost of goods sold	(20,659		)	(23,992		)
Deferred income	$	61,237		$	63,976

Schedule of Other Non-current Liabilities



	February 3, 2018		January 28, 2017
Other non-current liabilities:
Deferred tax liabilities	$	52,204	$	38,777
Technology license obligations	34,060		14,949
Long-term accrued employee compensation	1,029		4,075
Other	1,463		6,136
Other non-current liabilities	$	88,756	$	63,937

Schedule of Changes in Accumulated Other Comprehensive Income (Loss)

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



	Unrealized Gain (Loss) on Marketable Securities (1)			Unrealized Gain (Loss) on Cash Flow Hedges (2)			Total
Balance at January 30, 2016	$	(656	)	$	(139	)	$	(795	)
Other comprehensive income before reclassifications	1,766			1,496			3,262
Amounts reclassified from accumulated other comprehensive loss	(1,911		)	(533		)	(2,444		)
Net current-period other comprehensive income (loss), net of tax	(145		)	963			818
Balance at January 28, 2017	(801		)	824			23
Other comprehensive income (loss) before reclassifications	(1,460		)	2,341			881
Amounts reclassified from accumulated other comprehensive income (loss)	(61		)	(3,165		)	(3,226		)
Net current-period other comprehensive loss, net of tax	(1,521		)	(824		)	(2,345		)
Balance at February 3, 2018	$	(2,322	)	$	—		$	(2,322	)

(1) The amounts of gains (losses) associated with the Company's marketable securities reclassified from accumulated other comprehensive income (loss) are recorded in interest and other income, net.

Schedule of Interest and Other Income, Net



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Interest and other income, net:
Interest income	$	17,381		$	13,198		$	15,982
Net realized gain (loss) on investments	(2,777		)	1,500			(1,473		)
Gain on sale of business	5,254			—			—
Currency remeasurement gain (loss)	(28		)	1,746			6,655
Other income (loss)	2,364			946			(2,773		)
Interest expense	(685		)	(368		)	(706		)
	$	21,509		$	17,022		$	17,685

Schedule of Supplemental Cash Flow Information



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Supplemental cash flow information:
Cash paid for interest	$	746	$	363	$	703
Cash paid for income taxes, net	$	11,401	$	17,032	$	13,363
Non-Cash Investing and Financing Activities:
Purchase of software and intellectual property under license obligations	$	59,803	$	27,081	$	13,800
Unsettled trade receivable of available-for-sale securities	$	—	$	7,742	$	53,749
Unsettled trade payable of available-for-sale securities	$	4,497	$	15,371	$	—
Unpaid purchase of property and equipment at end of year	$	5,595	$	2,547	$	9,069
Unpaid repurchases of our common shares	$	—	$	1,499	$	—
Unpaid equity and debt financing costs	$	3,244	$	—	$	—

Investments (Tables)

12 Months Ended

Feb. 03, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

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



	February 3, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
U.S. government and agency debt	$	248,336	$	49	$	(644	)	$	247,741
Foreign government and agency debt	7,004		—		(17		)	6,987
Municipal debt securities	2,734		—		(6		)	2,728
Corporate debt securities	504,609		469		(1,999		)	503,079
Asset backed securities	42,429		3		(177		)	42,255
Held-to-Maturity:
Time deposits	150,000		—		—			150,000
Total short-term investments	955,112		521		(2,843		)	952,790
Total investments	$	955,112	$	521	$	(2,843	)	$	952,790



	January 28, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
U.S. government and agency debt	$	185,584	$	86	$	(283	)	$	185,387
Foreign government and agency debt	13,425		—		(50		)	13,375
Municipal debt securities	27,916		4		(49		)	27,871
Corporate debt securities	432,603		281		(776		)	432,108
Asset backed securities	45,541		33		(47		)	45,527
Held-to-Maturity:
Time deposits	150,000		—		—			150,000
Total short-term investments	855,069		404		(1,205		)	854,268
Long-term investments:
Available-for-sale:
Auction rate securities	4,615		—		—			4,615
Total long-term investments	4,615		—		—			4,615
Total investments	$	859,684	$	404	$	(1,205	)	$	858,883

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

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



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Gross realized gains	$	186		$	2,047		$	1,654
Gross realized losses	(2,963		)	(547		)	(1,923		)
Impairment loss	—			—			(1,204		)
Total net realized gains (losses)	$	(2,777	)	$	1,500		$	(1,473	)

Investments Classified by Contractual Maturity Date

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



	February 3, 2018				January 28, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	554,247	$	553,866	$	423,151	$	423,058
Due between one and five years	400,866		398,924		423,669		422,995
Due over five years	—		—		12,864		12,830
	$	955,113	$	952,790	$	859,684	$	858,883

Unrealized Loss Position Investments



	February 3, 2018
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
U.S. government and agency debt	$	148,538	$	(298	)	$	51,332	$	(346	)	$	199,870	$	(644	)
Foreign government and agency debt	3,993		(1		)	2,994		(16		)	6,987		(17		)
Municipal debt securities	1,969		(6		)	—		—			1,969		(6		)
Corporate debt securities	253,380		(1,514		)	46,805		(485		)	300,185		(1,999		)
Asset backed securities	37,636		(145		)	2,167		(32		)	39,803		(177		)
Total securities	$	445,516	$	(1,964	)	$	103,298	$	(879	)	$	548,814	$	(2,843	)



	January 28, 2017
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
U.S. government and agency debt	$	94,064	$	(283	)	$	—	$	—		$	94,064	$	(283	)
Foreign government and agency debt	11,875		(48		)	1,499		(2		)	13,374		(50		)
Municipal debt securities	17,450		(47		)	1,248		(2		)	18,698		(49		)
Corporate debt securities	199,382		(751		)	16,063		(25		)	215,445		(776		)
Asset backed securities	16,754		(47		)	—		—			16,754		(47		)
Total securities	$	339,525	$	(1,176	)	$	18,810	$	(29	)	$	358,335	$	(1,205	)

Derivative Financial Instruments (Tables)

12 Months Ended

Feb. 03, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Information about Gains (Losses) Associated with Derivative Financial Instruments

The following table provides information about gains (losses) associated with our derivative financial instruments (in thousands):



	Location of Gains (Losses) in Statement of Operations	Amount of Gains (Losses) in Statement of Operations for the Year Ended
	Location of Gains (Losses) in Statement of Operations	February 3, 2018		January 28, 2017		January 30, 2016
Derivatives designated as cash flow hedges:
Forward contracts:	Research and development	$	3,223	$	737	$	(390	)
	Selling, general and administrative	723		101		(31		)
		$	3,946	$	838	$	(421	)

Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss)



	Year Ended
Affected Line Item in the Statement of Operations	February 3, 2018		January 28, 2017		January 30, 2016
Operating costs and expenses:
Cash flow hedges:
Research and development	$	2,564	$	467	$	48
Selling, general and administrative	601		66		16
Total	$	3,165	$	533	$	64

Fair Value Measurements (Tables)

12 Months Ended

Feb. 03, 2018

Fair Value Disclosures [Abstract]

Fair Value, Assets and Liabilities Measured on Recurring Basis



	Fair Value Measurements at February 3, 2018
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	18,503	$	—	$	—	$	18,503
Time deposits	—		65,117		—		65,117
U.S. government and agency debt	51,589		—		—		51,589
Municipal debt securities	—		5,290		—		5,290
Corporate debt securities	—		127,076		—		127,076
Short-term investments:
Time deposits	—		150,000		—		150,000
U.S. government and agency debt	247,741		—		—		247,741
Foreign government and agency debt	—		6,987		—		6,987
Municipal debt securities	—		2,728		—		2,728
Corporate debt securities	—		503,079		—		503,079
Asset backed securities	—		42,255		—		42,255
Other non-current assets:
Severance pay fund	—		896		—		896
Total assets	$	317,833	$	903,428	$	—	$	1,221,261



	Fair Value Measurements at January 28, 2017
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	36,122	$	—	$	—	$	36,122
Time deposits	—		67,000		—		67,000
U.S. government and agency debt	17,497		—		—		17,497
Foreign government and agency debt	—		1,500		—		1,500
Municipal debt securities	—		8,740		—		8,740
Corporate debt securities	—		31,280		—		31,280
Short-term investments:
Time deposits	—		150,000		—		150,000
U.S. government and agency debt	185,387		—		—		185,387
Foreign government and agency debt	—		13,375		—		13,375
Municipal debt securities	—		27,871		—		27,871
Corporate debt securities	—		432,108		—		432,108
Asset backed securities	—		45,527		—		45,527
Prepaid expenses and other current assets:
Foreign currency forward contracts	—		735		—		735
Long-term investments:
Auction rate securities	—		—		4,615		4,615
Other non-current assets:
Severance pay fund	—		736		—		736
Total assets	$	239,006	$	778,872	$	4,615	$	1,022,493
Liabilities
Accrued liabilities:
Foreign currency forward contracts	$	—	$	58	$	—	$	58

Summary of Change in Fair Values for Level Three Assets

The following table summarizes the change in fair values for Level 3 assets for the years ended February 3, 2018 and January 28, 2017 (in thousands):



	Level 3
Changes in fair value during the year (pre-tax):
Balance at January 30, 2016	$	11,296
Sales, redemption and settlement	(6,681		)
Unrealized gain included in accumulated other comprehensive income	—
Balance at January 28, 2017	4,615
Sales, redemption and settlement	(4,550		)
Realized loss	(65		)
Balance at February 3, 2018	$	—

Goodwill and Acquired Intangible Assets, Net (Tables)

12 Months Ended

Feb. 03, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets by Major Class

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



		February 3, 2018							January 28, 2017
	Range of Useful Lives	Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amounts		Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amounts
Total acquired intangible assets from continuing operations, net:
Purchased and core technology	4 - 8 years	$	25,798	$	(25,798	)	$	—	$	25,798	$	(22,227	)	$	3,571

Commitments and Contingencies (Tables)

12 Months Ended

Feb. 03, 2018

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments, Net of Estimated Sublease Income under Operating and Capital Leases

Future minimum lease payments, net of estimated sublease income, and payments under technology license obligations as of February 3, 2018, are presented in the following tables (in thousands):



Fiscal Year	Minimum Operating Lease Payments
2019	$	27,200
2020	20,918
2021	8,688
2022	7,880
2023	7,729
Thereafter	5,451
Total future minimum lease payments	$	77,866

Future Minimum Lease Payments Under Technology License Obligations



Fiscal Year	Technology License Obligations
2019	$	34,250
2020	29,605
2021	7,358
Total future minimum lease payments	$	71,213
Less: amount representing interest	(1,493		)
Present value of future minimum payments	69,720
Less: current portion	(25,998		)
Non-current portion	$	43,722

Shareholders’ Equity (Tables)

12 Months Ended

Feb. 03, 2018

Equity [Abstract]

Schedule of Repurchases

A summary of the stock repurchase activity under the stock repurchase program, reported based on the trade date, is summarized as follows (in thousands, except per-share amounts):



	Shares Repurchased	Weighted- Average Price per Share		Amount Repurchased
Cumulative balance at January 31, 2015	221,901	$	12.65	$	2,806,543
Repurchase of common stock under the stock repurchase program (1)	19,700	$	13.24	260,875
Cumulative balance at January 30, 2016	241,602	$	12.70	3,067,418
Repurchase of common stock under the stock repurchase program (2)	13,303	$	13.76	183,064
Cumulative balance at January 28, 2017	254,904	$	12.75	3,250,481
Repurchase of common stock under the stock repurchase program (3)	31,460	$	16.72	526,075
Cumulative balance at February 3, 2018	286,365	$	13.19	$	3,776,557

(1) There were no stock repurchases pending settlement as of January 30, 2016.

(2) Includes stock repurchases of $1.5 million, which were pending settlement as of January 28, 2017.

(3) There were no stock repurchases pending settlement as of February 3, 2018.

Employee Benefit Plans (Tables)

12 Months Ended

Feb. 03, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

The following table summarizes share-based compensation expense (in thousands):



	Year Ended
	February 3, 2018			January 28, 2017		January 30, 2016
Continuing operations:
Cost of goods sold	$	6,646		$	8,334	$	7,787
Research and development	52,127			74,809		88,897
Selling, general and administrative	26,349			18,257		26,082
Share-based compensation - continuing operations	$	85,122		$	101,400	$	122,766
Discontinued operations:
Cost of goods sold	(11		)	187		129
Research and development	1,458			11,633		9,895
Selling, general and administrative	120			750		989
Share-based compensation - discontinued operations	1,567			12,570		11,013
Total share-based compensation	$	86,689		$	113,970	$	133,779

Schedule of Nonvested Share Activity

A summary of restricted stock unit activity, which includes time-based and performance-based or market-based restricted stock units, is as follows (in thousands, except per-share amounts):



	Time-Based				Performance-Based					Market-Based					Total
	Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value
Balance at January 31, 2015	9,748		$	14.84	1,254			$	14.99						11,002		$	14.85
Granted	5,689		$	12.88	669		*	$	14.08	407		*	$	12.24	6,765		$	12.96
Vested	(5,139	)	$	15.06	(658	)		$	15.15	—			$	—	(5,797	)	$	15.07
Canceled/Forfeited	(1,955	)	$	13.99	(288	)		$	14.39	(54	)		$	12.24	(2,297	)	$	14.00
Balance at January 30, 2016	8,343		$	13.57	977			$	14.43	353			$	12.24	9,673		$	13.61
Granted	9,139		$	9.83	366		*	$	13.91	612			$	11.94	10,117		$	10.11
Vested	(5,490	)	$	13.95	(155	)		$	14.15	—			$	—	(5,645	)	$	13.95
Canceled/Forfeited	(2,067	)	$	10.69	(875	)		$	14.45	(406	)		$	12.39	(3,348	)	$	11.88
Balance at January 28, 2017	9,925		$	10.52	313			$	13.91	559			$	11.80	10,797		$	10.69
Granted	8,154		$	15.33	406		*	$	14.49	409		*	$	15.14	8,969		$	15.28
Vested	(5,653	)	$	10.86	—			$	—	—			—		(5,653	)	$	10.86
Canceled/Forfeited	(2,137	)	$	11.95	(47	)		$	13.99	(47	)		$	14.71	(2,231	)	$	12.05
Balance at February 3, 2018	10,289		$	13.84	672			$	14.25	921			$	13.14	11,882		$	13.81


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

Schedule of Stock Option Activity

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



	Time-Based Options				Market-Based Options				Total
	Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price
Balance at January 31, 2015	47,140		$	13.79	2,232		$	15.43	49,372		$	13.88
Granted	6,170		$	14.13	—		—		6,170		$	14.13
Exercised	(2,225	)	$	9.79	—		—		(2,225	)	$	9.79
Canceled/Forfeited	(10,211	)	$	15.68	(76	)	$	15.43	(10,287	)	$	15.68
Balance at January 30, 2016	40,874		$	13.59	2,156		$	15.43	43,030		$	13.68
Granted	2,104		$	9.99	—		—		2,104		$	9.99
Exercised	(5,558	)	$	10.35	—		—		(5,558	)	$	10.35
Canceled/Forfeited	(12,324	)	$	16.44	(2,156	)	$	15.43	(14,480	)	$	16.29
Balance at January 28, 2017	25,096		$	12.61	—		$	—	25,096		$	12.61
Granted	—		$	—	—		—		—		$	—
Exercised	(10,305	)	$	12.38	—		—		(10,305	)	$	12.38
Canceled/Forfeited	(3,019	)	$	14.33	—		—		(3,019	)	$	14.33
Balance at February 3, 2018	11,772		$	12.36	—		$	—	11,772		$	12.36
Vested or expected to vest at February 3, 2018	11,772		$	12.36

Schedule of Outstanding Options and Exercisable Options Information, by Range of Exercise Prices

Outstanding options and exercisable options information by range of exercise prices as of February 3, 2018 was as follows:



				Outstanding Options				Exercisable Options
Range of Exercise Prices				Number of Shares (in Thousands)	Weighted Average Remaining Contractual Term (in Years)	Weighted Average Exercise Price		Number of Shares (in Thousands)	Weighted Average Exercise Price
$	5.70	$	10.47	2,083	3.79	$	8.02	1,463	$	7.32
$	10.76	$	10.76	3,400	5.23	$	10.76	3,398	$	10.76
$	10.80	$	14.35	3,226	6.03	$	13.56	982	$	11.89
$	14.45	$	15.87	2,795	5.66	$	15.46	1,667	$	15.42
$	15.91	$	21.62	268	2.00	$	19.55	264	$	19.60
Total				11,772	5.22	$	12.36	7,774	$	11.55

Weighted Average Assumptions Used to Calculate Fair Value Awards



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Employee Stock Purchase Plan:
Estimated fair value	$	6.03		$	3.83		$	3.24
Expected volatility	30		%	39		%	41		%
Expected term (in years)	1.2			1.2			1.3
Risk-free interest rate	1.6		%	0.7		%	0.6		%
Expected dividend yield	1.1		%	1.9		%	2.4		%



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Total Shareholder Return Awards:
Expected term (in years)	2.9		2.9		2.0
Expected volatility	35	%	36	%	27	%
Average correlation coefficient of peer companies	0.5		0.5		0.4
Risk-free interest rate	1.4	%	0.9	%	0.5	%
Expected dividend yield	1.6	%	2.1	%	1.7	%



	Year Ended
	February 3, 2018	January 28, 2017			January 30, 2016
Time-based Stock Options:
Weighted average fair value	N/A	$	2.92		$	3.93
Expected volatility	N/A	40		%	34		%
Expected term (in years)	N/A	5.2			5.4
Risk-free interest rate	N/A	1.3		%	1.6		%
Expected dividend yield	N/A	2.5		%	1.8		%

Income Taxes (Tables)

12 Months Ended

Feb. 03, 2018

Income Tax Disclosure [Abstract]

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

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



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
U.S. operations	$	24,377	$	30,601	$	32,095
Non-U.S. operations	426,827		116,828		(759,820		)
	$	451,204	$	147,429	$	(727,725	)

Schedule of Provision (Benefit) for Income Taxes

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



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Current income tax provision (benefit):
Federal	$	776		$	8,231		$	10,413
State	2			180			83
Foreign	(2,541		)	19,560			(5,876		)
Total current income tax provision (benefit)	(1,763		)	27,971			4,620
Deferred income tax provision (benefit):
Federal	10,136			(5,062		)	(4,355		)
State	83			(12		)	580
Foreign	9,606			49,711			9,871
Total deferred income tax provision (benefit)	19,825			44,637			6,096
Total provision (benefit) for income taxes	$	18,062		$	72,608		$	10,716

Schedule of Deferred Tax Assets and Liabilities

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



	February 3, 2018			January 28, 2017
Deferred tax assets:
Federal and California research and other tax credits	$	607,726		$	450,503
Reserves and accruals	16,951			35,887
Share-based compensation	2,493			3,733
Net operating losses	11,816			5,361
Gross deferred tax assets	638,986			495,484
Valuation allowance	(618,353		)	(456,541		)
Total deferred tax assets	20,633			38,943
Total deferred tax liabilities	(52,204		)	(51,112		)
Net deferred tax assets (liabilities)	$	(31,571	)	$	(12,169	)

Reconciliation Between the Provision (Benefit) for Income Taxes at the Statutory Rate and the Effective Tax Rate

For purposes of the reconciliation between the provision (benefit) for income taxes at the statutory rate and the effective tax rate, a notional U.S. 33.7% rate for fiscal year 2018, and a notional rate of 35% for fiscal 2017 and 2016 is applied as follows:



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Provision at U.S. notional statutory rate	33.7	%	35.0	%	35.0	%
Difference in U.S. and non-U.S. tax rates	(31.7	)	(26.3	)	(37.1	)
Benefits from utilization of general business credits	(4.8	)	(28.4	)	5.5
Change in valuation allowance	4.7		24.3		(4.4	)
Withholding taxes	—		34.0		—
Tax effects of global restructuring	—		11.4		—
Other	2.1		(0.7	)	(0.5	)
Effective tax rate	4.0	%	49.3	%	(1.5	)%

Unrecognized Tax Benefits Reconciliation

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



	Year Ended
	February 3, 2018			January 28, 2017			January 30, 2016
Unrecognized tax benefits as of the beginning of the period	$	23,793		$	29,139		$	45,197
Increases related to prior year tax positions	—			2,080			304
Decreases related to prior year tax positions	—						(4,334		)
Increases related to current year tax positions	2,776			2,363			4,237
Settlements	—			—			(704		)
Lapse in the statute of limitations	(3,341		)	(6,576		)	(9,739		)
Foreign exchange gain	24			(3,213		)	(5,822		)
Gross amounts of unrecognized tax benefits as of the end of the period	$	23,252		$	23,793		$	29,139

Net Income (Loss) Per Share (Tables)

12 Months Ended

Feb. 03, 2018

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share

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



	Year Ended
	February 3, 2018		January 28, 2017			January 30, 2016
Numerator:
Income (loss) from continuing operations, net of tax	$	433,142	$	74,821		$	(738,441	)
Income (loss) from discontinued operations, net of tax	87,689		(53,670		)	(72,959		)
Net income (loss)	$	520,831	$	21,151		$	(811,400	)
Denominator:
Weighted average shares — basic	498,008		509,738			510,945
Effect of dilutive securities:
Share-based awards	11,659		7,775			—
Weighted average shares — diluted	509,667		517,513			510,945
Income (loss) from continuing operations per share:
Basic	$	0.87	$	0.15		$	(1.45	)
Diluted	$	0.85	$	0.14		$	(1.45	)
Income (loss) from discontinued operations per share:
Basic	$	0.18	$	(0.11	)	$	(0.14	)
Diluted	$	0.17	$	(0.10	)	$	(0.14	)
Net income (loss) per share:
Basic	$	1.05	$	0.04		$	(1.59	)
Diluted	$	1.02	$	0.04		$	(1.59	)

Schedule of Anti-dilutive Potential Shares

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



	Year Ended
	February 3, 2018	January 28, 2017	January 30, 2016
Weighted average shares outstanding:
Share-based awards	412	22,642	64,420

Segment and Geographic Information (Tables)

12 Months Ended

Feb. 03, 2018

Segment Reporting [Abstract]

Net Revenue and Long-Lived Asset Information Based on Geographic Region



	Year Ended
	February 3, 2018		January 28, 2017		January 30, 2016
Net Revenue:
China	$	1,205,202	$	1,224,032	$	1,471,180
Malaysia	388,469		286,267		302,953
Philippines	270,101		283,345		211,602
Thailand	137,662		113,778		189,299
United States	42,560		51,416		60,119
Others	365,176		342,154		367,344
	$	2,409,170	$	2,300,992	$	2,602,497



	February 3, 2018		January 28, 2017
Property and equipment, net:
United States	$	156,053	$	147,552
Singapore	15,827		54,054
Israel	12,686		12,133
China	10,145		16,484
Others	7,511		13,174
	$	202,222	$	243,397

Basis of Presentation - Out-of-period Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 29, 2017	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue accruals		$ 2,409,170	$ 2,300,992	$ 2,602,497
Income from continuing operations, net of tax		$ 433,142	$ 74,821	$ (738,441)
Basic earnings per share from continuing operations (in usd per share)		$ 0.87	$ 0.15	$ (1.45)
Diluted earnings per share from continuing operations (in usd per share)		$ 0.85	$ 0.14	$ (1.45)
Out-of-period Adjustments Related to Revenue Accruals and Other Expenses
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue accruals	$ 4,700
Other expenses	$ 3,200
Income from continuing operations, net of tax		$ 7,900
Basic earnings per share from continuing operations (in usd per share)		$ 0.02
Diluted earnings per share from continuing operations (in usd per share)		$ 0.02

- Definition

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

+ References + Details

- Definition

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

+ References + Details

Basis of Presentation - Merger Agreement (Details) - USD ($)	7 Months Ended
	Jun. 30, 2018	Feb. 03, 2018	Jan. 28, 2017
Business Acquisition [Line Items]
Deferred debt and equity financing costs		$ 17,622,000	$ 0
Scenario, Forecast \| Line of Credit \| Revolving Credit Facility
Business Acquisition [Line Items]
Maximum borrowing capacity	$ 500,000,000
Cavium \| Scenario, Forecast
Business Acquisition [Line Items]
Number of common shares per Cavium share	2.1757
Cash consideration (in usd per share)	$ 40.00
Purchase price (in usd per share)	$ 80
Transaction value	$ 6,000,000,000
Amount of debt financing	1,750,000,000
Termination fee	180,000,000
Cavium \| Scenario, Forecast \| Goldman Sachs Bank USA
Business Acquisition [Line Items]
Commitments of debt financing	850,000,000
Cavium \| Scenario, Forecast \| Bank of America Merrill Lynch
Business Acquisition [Line Items]
Commitments of debt financing	$ 900,000,000

Significant Accounting Policies - Discontinued Operations (Details)	12 Months Ended
	Feb. 03, 2018 business
Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses to be disposed of	3

Significant Accounting Policies - Concentration of Credit Risk and Significant Customers (Details) - Customer Concentration Risk - Accounts Receivable	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017
Customer A
Concentration Risk [Line Items]
Concentration of risk percentage	22.00%	27.00%
Customer B
Concentration Risk [Line Items]
Concentration of risk percentage	17.00%	15.00%
Customer C
Concentration Risk [Line Items]
Concentration of risk percentage	16.00%	14.00%
Customer D
Concentration Risk [Line Items]
Concentration of risk percentage		11.00%

Significant Accounting Policies - Schedule of Net Revenue Attributable to Significant Customers (Details) - Net Revenue - Customer Concentration Risk	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Western Digital
Concentration Risk [Line Items]
Concentration of risk percentage	20.00%	21.00%	19.00%
Toshiba
Concentration Risk [Line Items]
Concentration of risk percentage	14.00%	14.00%
Seagate
Concentration Risk [Line Items]
Concentration of risk percentage	11.00%	9.00%	14.00%
Wintech
Concentration Risk [Line Items]
Concentration of risk percentage	10.00%	10.00%

Significant Accounting Policies - Property and Equipment, Net (Details)	12 Months Ended
	Feb. 03, 2018
Machinery and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Machinery and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	7 years
Computer software \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Computer software \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	4 years
Furniture and fixtures \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Furniture and fixtures \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	4 years
Building
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	30 years
Building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	15 years

Significant Accounting Policies - Goodwill (Details)	12 Months Ended
Significant Accounting Policies - Goodwill (Details)	Feb. 03, 2018 reporting_unit component segment
Accounting Policies [Abstract]
Number of operating segments \| segment	1
Number of components \| component	2
Number of reporting units for impairment testing \| reporting_unit	1

Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
	Feb. 03, 2018
Minimum
Inventory [Line Items]
Inventory turnover period (in days)	60 days
Maximum
Inventory [Line Items]
Inventory turnover period (in days)	90 days

Significant Accounting Policies - Advertising Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Accounting Policies [Abstract]
Advertising costs	$ 0.2	$ 0.5	$ 5.1

Significant Accounting Policies - Share-Based Compensation (Details)	12 Months Ended
	Feb. 03, 2018 group
Employee group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of groups used in calculating assumptions for stock option exercises and pre-vesting terminations of stock options	2
Employee/non-employee group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of groups used in calculating assumptions for stock option exercises and pre-vesting terminations of stock options	1
Stock Purchase Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period	2 years

Significant Accounting Policies - Warranty (Details)	12 Months Ended
Significant Accounting Policies - Warranty (Details)	Feb. 03, 2018
Accounting Policies [Abstract]
Standard warranty period	1 year
Extended warranty period	1 year

Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	May 05, 2018	Feb. 03, 2018	Jan. 28, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of stock compensation accounting change			$ 0
Retained earnings		$ 1,409,452	1,009,841
Accounting Standards Update 2014-09 \| Difference between Revenue Guidance in Effect before and after Topic 606 \| Scenario, Forecast \| Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 25,000
Accounting Standards Update 2014-09 \| Difference between Revenue Guidance in Effect before and after Topic 606 \| Scenario, Forecast \| Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 40,000
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of stock compensation accounting change			$ (1,969)

Discontinued Operations - Additional Information (Details) $ in Thousands				12 Months Ended
	Sep. 08, 2017 USD ($)	May 18, 2017 USD ($)	Apr. 04, 2017 USD ($) business	Feb. 03, 2018 USD ($)	Jan. 28, 2017 USD ($)	Jan. 30, 2016 USD ($)
Business Acquisition [Line Items]
Proceeds from sale of business				$ 2,402	$ 0	$ 0
Share-based compensation				86,689	113,970	133,779
Discontinued Operations, Disposed of by Sale
Business Acquisition [Line Items]
Pre-tax gain on sale of business				88,406	0	0
Share-based compensation				1,600	12,600	11,000
Provision for income taxes				5,900	$ 1,390	$ 1,630
Broadband Business \| Discontinued Operations, Disposed of by Sale
Business Acquisition [Line Items]
Number of businesses to be disposed of \| business			1
Proceeds from sale of business			$ 23,000	23,000
Pre-tax gain on sale of business			$ 8,200
LTE Business \| Discontinued Operations, Disposed of by Sale
Business Acquisition [Line Items]
Proceeds from sale of business		$ 52,900		49,200
Pre-tax gain on sale of business		34,000
Tax withholding liability paid to tax authorities		$ 3,600
Tax expense from sale of business				4,500
Multimedia Business \| Discontinued Operations, Disposed of by Sale
Business Acquisition [Line Items]
Proceeds from sale of business	$ 93,700			93,700
Pre-tax gain on sale of business	$ 46,200
Tax expense from sale of business				$ 500

Discontinued Operations - Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Current assets held for sale:
Total assets of the disposal group classified as held for sale	$ 30,767	$ 57,077
Current liabilities held for sale:
Total liabilities of the disposal group classified as held for sale	0	5,818
Discontinued Operations, Held for Sale
Current assets held for sale:
Inventory	0	9,281
Property and equipment, net	0	5,270
Goodwill	0	36,636
Acquired intangible assets, net	0	3,799
Other	0	1,490
Total assets of the disposal group classified as held for sale	0	56,476
Current liabilities held for sale:
Deferred Income	0	5,818
Total liabilities of the disposal group classified as held for sale	0	5,818
Held-for-sale, Not Discontinued Operations
Current assets held for sale:
Total assets of the disposal group classified as held for sale	$ 30,767	$ 601

Discontinued Operations - Components of Results of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Operating expenses:
Net income (loss) from discontinued operations	$ 87,689	$ (53,670)	$ (72,959)
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue	94,137	115,437	123,332
Cost of goods sold	47,499	72,764	88,616
Gross Profit	46,638	42,673	34,716
Operating expenses:
Research and development	34,530	88,538	99,603
Selling, general and administrative	6,925	6,415	6,442
Total operating expenses	41,455	94,953	106,045
Income (loss) from discontinued operations before income taxes	5,183	(52,280)	(71,329)
Gain from sale of discontinued operations	88,406	0	0
Provision for income taxes	5,900	1,390	1,630
Net income (loss) from discontinued operations	$ 87,689	$ (53,670)	$ (72,959)

Restructuring and Other Related Charges - Summary of Restructuring and Other Related Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	$ 5,250	$ 96,801	$ 63,543
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	0	0	10,292
Restructuring related charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	$ 5,250	$ 96,801	$ 53,251

Restructuring and Other Related Charges - Charges Related to Restructuring Actions (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Restructuring and Related Activities [Abstract]
Severance and related costs	$ 8,247	$ 32,650	$ 43,926
Facilities and related costs	1,692	6,587	1,407
Loss on early contract termination	0	0	1,644
Other exit-related costs	2,082	5,452	534
Restructuring charges	12,021	44,689	47,511
Impairment and write-off of assets & restructuring (gain):
Prepaid deposit	0	45,000	0
Inventory	0	0	8,046
Technology licenses	174	629	1,250
Restructuring and other related charges	5,250	96,801	63,543
Equipment and other
Impairment and write-off of assets & restructuring (gain):
Tangible assets	(489)	6,952	6,736
Building sale
Impairment and write-off of assets & restructuring (gain):
Tangible assets	(4,246)	0	0
Severance
Restructuring Cost and Reserve [Line Items]
Release of reserves	(1,612)	(86)	0
Facilities and related costs
Restructuring Cost and Reserve [Line Items]
Release of reserves	(258)	0	0
Other exit-related costs
Restructuring Cost and Reserve [Line Items]
Release of reserves	$ (340)	$ (383)	$ 0

Restructuring and Other Related Charges - Additional Information (Details)	1 Months Ended	5 Months Ended	12 Months Ended
	Oct. 31, 2015 USD ($)	Aug. 01, 2015 USD ($)	Feb. 03, 2018 USD ($)	Jan. 28, 2017 USD ($) employee	Jan. 30, 2016 USD ($) employee	Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			$ 5,250,000	$ 96,801,000	$ 63,543,000
Restructuring charges			12,021,000	44,689,000	47,511,000
Asset impairment charges		$ 1,400,000
Proceeds from sales of property and equipment	$ 9,300,000		12,559,000	0	10,007,000
Gain or loss recognized upon sale of equipment held for sale	$ 0		743,000	0	0
Discontinued operations
Restructuring Cost and Reserve [Line Items]
Restructuring charges			10,584,000	8,385,000
Severance
Restructuring Cost and Reserve [Line Items]
Release of reserves - continuing operations			1,612,000	86,000	0
Other exit-related costs
Restructuring Cost and Reserve [Line Items]
Release of reserves - continuing operations			340,000	383,000	0
Facilities and related costs
Restructuring Cost and Reserve [Line Items]
Release of reserves - continuing operations			258,000	0	0
November 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred			95,600,000
Restructuring charges				90,300,000
November 2016 Restructuring \| Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges				32,600,000
November 2016 Restructuring \| Severance \| Discontinued operations
Restructuring Cost and Reserve [Line Items]
Restructuring charges			7,015,000	8,385,000
November 2016 Restructuring \| Other exit-related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges				5,500,000
November 2016 Restructuring \| Other exit-related costs \| Discontinued operations
Restructuring Cost and Reserve [Line Items]
Restructuring charges			3,560,000	0
November 2016 Restructuring \| Facilities and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges				1,900,000
November 2016 Restructuring \| Facilities and related costs \| Discontinued operations
Restructuring Cost and Reserve [Line Items]
Restructuring charges			9,000	0
November 2016 Restructuring \| Contract termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges				45,000,000
November 2016 Restructuring \| Impairment of equipment and technology licenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges				5,400,000
Mobile Platform Business
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred			46,400,000
Restructuring charges				$ 1,900,000	$ 44,400,000
Number of employees retained \| employee				140
Number of employees offered with retention bonuses \| employee				128
Mobile Platform Business \| Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring costs, expected cost to incur						$ 100,000,000
Mobile Platform Business \| Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring costs, expected cost to incur						$ 130,000,000
Mobile Platform Business \| Severance
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred			28,100,000
Number of employees departed and were paid severance and related benefit costs \| employee					825
Mobile Platform Business \| Facilities and related costs
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred			200,000
Restructuring charges				$ 4,600,000	$ 1,400,000
Mobile Platform Business \| Contract termination
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred			1,300,000
Release of reserves - continuing operations				300,000
Mobile Platform Business \| Impairment of equipment and technology licenses
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred			8,800,000
Mobile Platform Business \| Write-off of assets held-for-sale
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 2,200,000
Mobile Platform Business \| Write down of inventory
Restructuring Cost and Reserve [Line Items]
Cumulative costs incurred			$ 8,000,000
Reduction in Operations in Israel and Closing of Other Design Centers
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 16,300,000
Total number of employees to be terminated \| employee					358
Reduction in Operations in Israel and Closing of Other Design Centers \| Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 15,100,000
Reduction in Operations in Israel and Closing of Other Design Centers \| Facilities and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 1,200,000

Restructuring and Other Related Charges - Reconciliation of Beginning and Ending Restructuring Liability Balances by Major Type of Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 24,099	$ 3,842
Restructuring charges	12,021	44,689	$ 47,511
Net cash payments	(44,815)	(32,459)
Exchange rate adjustment		111
Other	1,992
Balance at end of period	1,671	24,099	3,842
Less: non-current portion	(59)
Current portion	1,612	23,150
Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring charges	12,021	44,689
Release of reserves - continuing operations	(2,210)	(469)
Discontinued operations
Restructuring Reserve [Roll Forward]
Restructuring charges	10,584	8,385
Severance and related costs
Restructuring Reserve [Roll Forward]
Release of reserves - continuing operations	1,612	86	0
Facilities and related costs
Restructuring Reserve [Roll Forward]
Release of reserves - continuing operations	258	0	0
Other exit-related costs
Restructuring Reserve [Roll Forward]
Release of reserves - continuing operations	340	383	0
November 2016 Restructuring
Restructuring Reserve [Roll Forward]
Restructuring charges		90,300
November 2016 Restructuring \| Severance and related costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	17,000	0
Restructuring charges		32,600
Net cash payments	(29,996)	(24,065)
Exchange rate adjustment		45
Other	0
Balance at end of period	654	17,000	0
Less: non-current portion	0
Current portion	654
November 2016 Restructuring \| Severance and related costs \| Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring charges	8,247	32,635
Release of reserves - continuing operations	(1,612)	0
November 2016 Restructuring \| Severance and related costs \| Discontinued operations
Restructuring Reserve [Roll Forward]
Restructuring charges	7,015	8,385
November 2016 Restructuring \| Facilities and related costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	1,763	0
Restructuring charges		1,900
Net cash payments	(2,744)	(110)
Exchange rate adjustment		1
Other	0
Balance at end of period	462	1,763	0
Less: non-current portion	(59)
Current portion	403
November 2016 Restructuring \| Facilities and related costs \| Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring charges	1,692	1,872
Release of reserves - continuing operations	(258)	0
November 2016 Restructuring \| Facilities and related costs \| Discontinued operations
Restructuring Reserve [Roll Forward]
Restructuring charges	9	0
November 2016 Restructuring \| Other exit-related costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	4,625	0
Restructuring charges		5,500
Net cash payments	(11,364)	(829)
Exchange rate adjustment		2
Other	1,992
Balance at end of period	555	4,625	0
Less: non-current portion	0
Current portion	555
November 2016 Restructuring \| Other exit-related costs \| Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring charges	2,082	5,452
Release of reserves - continuing operations	(340)	0
November 2016 Restructuring \| Other exit-related costs \| Discontinued operations
Restructuring Reserve [Roll Forward]
Restructuring charges	3,560	0
Mobile & Other Prior Restructuring \| Severance and related costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0	1,155
Net cash payments	0	(1,082)
Exchange rate adjustment		(2)
Other	0
Balance at end of period	0	0	1,155
Less: non-current portion	0
Current portion	0
Mobile & Other Prior Restructuring \| Severance and related costs \| Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring charges	0	15
Release of reserves - continuing operations	0	(86)
Mobile & Other Prior Restructuring \| Severance and related costs \| Discontinued operations
Restructuring Reserve [Roll Forward]
Restructuring charges	0	0
Mobile & Other Prior Restructuring \| Facilities and related costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	711	1,043
Net cash payments	(711)	(5,112)
Exchange rate adjustment		65
Other	0
Balance at end of period	0	711	1,043
Less: non-current portion	0
Current portion	0
Mobile & Other Prior Restructuring \| Facilities and related costs \| Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring charges	0	4,715
Release of reserves - continuing operations	0	0
Mobile & Other Prior Restructuring \| Facilities and related costs \| Discontinued operations
Restructuring Reserve [Roll Forward]
Restructuring charges	0	0
Mobile & Other Prior Restructuring \| Other exit-related costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0	1,644
Net cash payments	0	(1,261)
Exchange rate adjustment		0
Other	0
Balance at end of period	0	0	$ 1,644
Less: non-current portion	0
Current portion	0
Mobile & Other Prior Restructuring \| Other exit-related costs \| Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring charges	0	0
Release of reserves - continuing operations	0	(383)
Mobile & Other Prior Restructuring \| Other exit-related costs \| Discontinued operations
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 0	$ 0

Supplemental Financial Information - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Cash and cash equivalents:
Cash	$ 620,907	$ 651,953
Cash equivalents:
Money market funds	18,503	36,122
Time deposits	65,117	67,000
U.S. government and agency debt	51,589	17,497
Foreign government and agency debt	0	1,500
Municipal debt securities	5,290	8,740
Corporate debt securities	127,076	31,280
Cash and cash equivalents	$ 888,482	$ 814,092	$ 1,278,180	$ 1,210,977

Supplemental Financial Information - Provision for Sales Return and Allowance (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Provision for sales returns and allowances:
Sales returns	$ 1,516	$ 470
Doubtful accounts	984	914
Provision for sales returns and allowances	$ 2,500	$ 1,384

Supplemental Financial Information - Inventories (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Inventories:
Work-in-process	$ 103,711	$ 109,362
Finished goods	66,328	61,480
Inventories	170,039	170,842
Inventory held at third-party logistics providers	$ 18,700	$ 26,500

Supplemental Financial Information - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 902,483	$ 1,009,244
Less: Accumulated depreciation	(700,261)	(765,847)
Property and equipment, net	202,222	243,397
Depreciation expense	49,200	82,400	$ 73,800
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	535,416	589,280
Land, buildings, and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	247,675	296,800
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	98,253	99,186
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 21,139	$ 23,978

Supplemental Financial Information - Other Non-current Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Other non-current assets:
Technology and other licenses	$ 87,536	$ 53,254
Deferred tax assets	20,633	26,608
Deferred debt and equity financing costs	17,622	0
Investments in privately-held companies	2,200	5,787
Prepaid land use rights	8,588	12,810
Deposits	3,504	3,756
Long-term investments	0	4,615
Other	8,717	11,109
Other non-current assets	148,800	117,939
Technology and Other Licenses
Finite-Lived Intangible Assets [Line Items]
Amortization and write-off of acquired intangible assets	$ 34,300	$ 25,500	$ 26,400

Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Accrued liabilities:
Technology license obligations	$ 28,488	$ 21,905
Accrued royalties	11,860	17,349
Accrued rebates	9,292	26,095
Accrued legal related expenses	13,050	7,727
Unsettled investment trades	4,497	15,371
Restructuring liabilities	1,612	23,150
Other	18,159	31,894
Accrued liabilities	$ 86,958	$ 143,491

Supplemental Financial Information - Deferred Income (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Deferred income:
Deferred revenue	$ 81,896	$ 87,968
Deferred cost of goods sold	(20,659)	(23,992)
Deferred income	$ 61,237	$ 63,976

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References + Details

Supplemental Financial Information - Other Non-current Liabilities (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Other non-current liabilities:
Deferred tax liabilities	$ 52,204	$ 38,777
Technology license obligations	34,060	14,949
Long-term accrued employee compensation	1,029	4,075
Other	1,463	6,136
Other non-current liabilities	$ 88,756	$ 63,937

Supplemental Financial Information - Changes in Accumulated Other Comprehensive Income (Loss) by Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 4,027,651	$ 4,140,123	$ 5,146,089
Other comprehensive income (loss) before reclassifications	881	3,262
Amounts reclassified from accumulated other comprehensive income (loss)	(3,226)	(2,444)
Other comprehensive income (loss), net of tax	(2,345)	818	(1,103)
Balance at end of period	4,141,413	4,027,651	4,140,123
Unrealized Gain (Loss) on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(801)	(656)
Other comprehensive income (loss) before reclassifications	(1,460)	1,766
Amounts reclassified from accumulated other comprehensive income (loss)	(61)	(1,911)
Other comprehensive income (loss), net of tax	(1,521)	(145)
Balance at end of period	(2,322)	(801)	(656)
Unrealized Gain (Loss) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	824	(139)
Other comprehensive income (loss) before reclassifications	2,341	1,496
Amounts reclassified from accumulated other comprehensive income (loss)	(3,165)	(533)
Other comprehensive income (loss), net of tax	(824)	963
Balance at end of period	0	824	(139)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	23	(795)	308
Other comprehensive income (loss), net of tax	(2,345)	818	(1,103)
Balance at end of period	$ (2,322)	$ 23	$ (795)

Supplemental Financial Information - Interest and Other Income, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Interest and other income, net:
Interest income	$ 17,381	$ 13,198	$ 15,982
Net realized gain (loss) on investments	(2,777)	1,500	(1,473)
Gain on sale of business	5,254	0	0
Currency remeasurement gain (loss)	(28)	1,746	6,655
Other income (loss)	2,364	946	(2,773)
Interest expense	(685)	(368)	(706)
Interest and other income, net	$ 21,509	$ 17,022	$ 17,685

- Definition

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

+ References + Details

Supplemental Financial Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Supplemental cash flow information:
Cash paid for interest	$ 746	$ 363	$ 703
Cash paid for income taxes, net	11,401	17,032	13,363
Non-Cash Investing and Financing Activities:
Purchase of software and intellectual property under license obligations	59,803	27,081	13,800
Unsettled trade receivable of available-for-sale securities	0	7,742	53,749
Unsettled trade payable of available-for-sale securities	4,497	15,371	0
Unpaid purchase of property and equipment at end of year	5,595	2,547	9,069
Unpaid repurchases of our common shares	0	1,499	0
Unpaid equity and debt financing costs	$ 3,244	$ 0	$ 0

Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Available-for-sale:
Amortized Cost	$ 955,113	$ 859,684
Estimated Fair Value	952,790	858,883
Held-to-Maturity:
Amortized Cost	955,112	859,684
Gross Unrealized Gains	521	404
Gross Unrealized Losses	(2,843)	(1,205)
Estimated Fair Value	952,790	858,883
Short-term Investments
Held-to-Maturity:
Amortized Cost	955,112	855,069
Gross Unrealized Gains	521	404
Gross Unrealized Losses	(2,843)	(1,205)
Estimated Fair Value	952,790	854,268
U.S. government and agency debt
Available-for-sale:
Amortized Cost	248,336	185,584
Gross Unrealized Gains	49	86
Gross Unrealized Losses	(644)	(283)
Estimated Fair Value	247,741	185,387
Foreign government and agency debt
Available-for-sale:
Amortized Cost	7,004	13,425
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(17)	(50)
Estimated Fair Value	6,987	13,375
Municipal debt securities
Available-for-sale:
Amortized Cost	2,734	27,916
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(6)	(49)
Estimated Fair Value	2,728	27,871
Corporate debt securities
Available-for-sale:
Amortized Cost	504,609	432,603
Gross Unrealized Gains	469	281
Gross Unrealized Losses	(1,999)	(776)
Estimated Fair Value	503,079	432,108
Asset backed securities
Available-for-sale:
Amortized Cost	42,429	45,541
Gross Unrealized Gains	3	33
Gross Unrealized Losses	(177)	(47)
Estimated Fair Value	42,255	45,527
Time deposits
Held-to-Maturity:
Amortized Cost	150,000	150,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 150,000	150,000
Long-term investments
Held-to-Maturity:
Amortized Cost		4,615
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		4,615
Auction rate securities
Available-for-sale:
Amortized Cost		4,615
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 4,615

Investments - Additional Information (Details) - USD ($) $ in Millions	Feb. 03, 2018	Jan. 28, 2017
Investments, Debt and Equity Securities [Abstract]
Short-term, highly liquid investments	$ 267.6	$ 162.1

Investments - Gross Realized Gains and Losses on Sales of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 186	$ 2,047	$ 1,654
Gross realized losses	(2,963)	(547)	(1,923)
Impairment loss	0	0	(1,204)
Total net realized gains (losses)	$ (2,777)	$ 1,500	$ (1,473)

Investments - Contractual Maturities of Available for Sale Securities (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Amortized Cost
Due in one year or less	$ 554,247	$ 423,151
Due between one and five years	400,866	423,669
Due over five years	0	12,864
Amortized Cost	955,113	859,684
Estimated Fair Value
Due in one year or less	553,866	423,058
Due between one and five years	398,924	422,995
Due over five years	0	12,830
Estimated Fair Value	$ 952,790	$ 858,883

Investments - Summary of Investments Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Fair Value
Less than 12 months	$ 445,516	$ 339,525
12 months or more	103,298	18,810
Total	548,814	358,335
Unrealized Loss
Less than 12 months	(1,964)	(1,176)
12 months or more	(879)	(29)
Total	(2,843)	(1,205)
U.S. government and agency debt
Fair Value
Less than 12 months	148,538	94,064
12 months or more	51,332	0
Total	199,870	94,064
Unrealized Loss
Less than 12 months	(298)	(283)
12 months or more	(346)	0
Total	(644)	(283)
Foreign government and agency debt
Fair Value
Less than 12 months	3,993	11,875
12 months or more	2,994	1,499
Total	6,987	13,374
Unrealized Loss
Less than 12 months	(1)	(48)
12 months or more	(16)	(2)
Total	(17)	(50)
Municipal debt securities
Fair Value
Less than 12 months	1,969	17,450
12 months or more	0	1,248
Total	1,969	18,698
Unrealized Loss
Less than 12 months	(6)	(47)
12 months or more	0	(2)
Total	(6)	(49)
Corporate debt securities
Fair Value
Less than 12 months	253,380	199,382
12 months or more	46,805	16,063
Total	300,185	215,445
Unrealized Loss
Less than 12 months	(1,514)	(751)
12 months or more	(485)	(25)
Total	(1,999)	(776)
Asset backed securities
Fair Value
Less than 12 months	37,636	16,754
12 months or more	2,167	0
Total	39,803	16,754
Unrealized Loss
Less than 12 months	(145)	(47)
12 months or more	(32)	0
Total	$ (177)	$ (47)

Derivative Financial Instruments - Additional Information (Details) - USD ($)	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 0
Hedge ineffectiveness from derivative financial instruments	0	$ 0	$ 0
Cash flow hedges were terminated as a result of forecasted transactions that did not occur	$ 0	0	$ 0
Buy contracts \| Israeli shekel
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount		$ 63,500,000

Derivative Financial Instruments - Information about Gains (Losses) Associated with Derivative Financial Instruments (Details) - Cash flow hedges - Foreign currency forward contracts - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ 3,946	$ 838	$ (421)
Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	3,223	737	(390)
Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ 723	$ 101	$ (31)

Derivative Financial Instruments - Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Research and development	$ 714,444	$ 805,029	$ 954,653
Reclassification out of accumulated other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Total	3,165	533	64
Reclassification out of accumulated other comprehensive income (loss) \| Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Research and development	2,564	467	48
Selling, general and administrative	$ 601	$ 66	$ 16

Fair Value Measurements - Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Assets
Investments	$ 952,790	$ 858,883
Fair Value
Assets
Total assets	1,221,261	1,022,493
Fair Value \| Foreign currency forward contracts
Liabilities
Accrued liabilities		58
Fair Value \| Prepaid expenses and other current assets \| Foreign currency forward contracts
Assets
Prepaid expenses and other current assets		735
Fair Value \| Other non-current assets \| Severance pay fund
Assets
Other non-current assets	896	736
Fair Value \| Money market funds
Assets
Cash equivalents	18,503	36,122
Fair Value \| Time deposits
Assets
Cash equivalents	65,117	67,000
Fair Value \| Time deposits \| Short-term investments
Assets
Investments	150,000	150,000
Fair Value \| U.S. government and agency debt
Assets
Cash equivalents	51,589	17,497
Fair Value \| U.S. government and agency debt \| Short-term investments
Assets
Investments	247,741	185,387
Fair Value \| Foreign government and agency debt
Assets
Cash equivalents		1,500
Fair Value \| Foreign government and agency debt \| Short-term investments
Assets
Investments	6,987	13,375
Fair Value \| Municipal debt securities
Assets
Cash equivalents	5,290	8,740
Fair Value \| Municipal debt securities \| Short-term investments
Assets
Investments	2,728	27,871
Fair Value \| Corporate debt securities
Assets
Cash equivalents	127,076	31,280
Fair Value \| Corporate debt securities \| Short-term investments
Assets
Investments	503,079	432,108
Fair Value \| Asset backed securities \| Short-term investments
Assets
Investments	42,255	45,527
Fair Value \| Auction rate securities \| Long-term investments
Assets
Investments		4,615
Fair Value \| Level 1
Assets
Total assets	317,833	239,006
Fair Value \| Level 1 \| Foreign currency forward contracts
Liabilities
Accrued liabilities		0
Fair Value \| Level 1 \| Prepaid expenses and other current assets \| Foreign currency forward contracts
Assets
Prepaid expenses and other current assets		0
Fair Value \| Level 1 \| Other non-current assets \| Severance pay fund
Assets
Other non-current assets	0	0
Fair Value \| Level 1 \| Money market funds
Assets
Cash equivalents	18,503	36,122
Fair Value \| Level 1 \| Time deposits
Assets
Cash equivalents	0	0
Fair Value \| Level 1 \| Time deposits \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 1 \| U.S. government and agency debt
Assets
Cash equivalents	51,589	17,497
Fair Value \| Level 1 \| U.S. government and agency debt \| Short-term investments
Assets
Investments	247,741	185,387
Fair Value \| Level 1 \| Foreign government and agency debt
Assets
Cash equivalents		0
Fair Value \| Level 1 \| Foreign government and agency debt \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 1 \| Municipal debt securities
Assets
Cash equivalents	0	0
Fair Value \| Level 1 \| Municipal debt securities \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 1 \| Corporate debt securities
Assets
Cash equivalents	0	0
Fair Value \| Level 1 \| Corporate debt securities \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 1 \| Asset backed securities \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 1 \| Auction rate securities \| Long-term investments
Assets
Investments		0
Fair Value \| Level 2
Assets
Total assets	903,428	778,872
Fair Value \| Level 2 \| Foreign currency forward contracts
Liabilities
Accrued liabilities		58
Fair Value \| Level 2 \| Prepaid expenses and other current assets \| Foreign currency forward contracts
Assets
Prepaid expenses and other current assets		735
Fair Value \| Level 2 \| Other non-current assets \| Severance pay fund
Assets
Other non-current assets	896	736
Fair Value \| Level 2 \| Money market funds
Assets
Cash equivalents	0	0
Fair Value \| Level 2 \| Time deposits
Assets
Cash equivalents	65,117	67,000
Fair Value \| Level 2 \| Time deposits \| Short-term investments
Assets
Investments	150,000	150,000
Fair Value \| Level 2 \| U.S. government and agency debt
Assets
Cash equivalents	0	0
Fair Value \| Level 2 \| U.S. government and agency debt \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 2 \| Foreign government and agency debt
Assets
Cash equivalents		1,500
Fair Value \| Level 2 \| Foreign government and agency debt \| Short-term investments
Assets
Investments	6,987	13,375
Fair Value \| Level 2 \| Municipal debt securities
Assets
Cash equivalents	5,290	8,740
Fair Value \| Level 2 \| Municipal debt securities \| Short-term investments
Assets
Investments	2,728	27,871
Fair Value \| Level 2 \| Corporate debt securities
Assets
Cash equivalents	127,076	31,280
Fair Value \| Level 2 \| Corporate debt securities \| Short-term investments
Assets
Investments	503,079	432,108
Fair Value \| Level 2 \| Asset backed securities \| Short-term investments
Assets
Investments	42,255	45,527
Fair Value \| Level 2 \| Auction rate securities \| Long-term investments
Assets
Investments		0
Fair Value \| Level 3
Assets
Total assets	0	4,615
Fair Value \| Level 3 \| Foreign currency forward contracts
Liabilities
Accrued liabilities		0
Fair Value \| Level 3 \| Prepaid expenses and other current assets \| Foreign currency forward contracts
Assets
Prepaid expenses and other current assets		0
Fair Value \| Level 3 \| Other non-current assets \| Severance pay fund
Assets
Other non-current assets	0	0
Fair Value \| Level 3 \| Money market funds
Assets
Cash equivalents	0	0
Fair Value \| Level 3 \| Time deposits
Assets
Cash equivalents	0	0
Fair Value \| Level 3 \| Time deposits \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 3 \| U.S. government and agency debt
Assets
Cash equivalents	0	0
Fair Value \| Level 3 \| U.S. government and agency debt \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 3 \| Foreign government and agency debt
Assets
Cash equivalents		0
Fair Value \| Level 3 \| Foreign government and agency debt \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 3 \| Municipal debt securities
Assets
Cash equivalents	0	0
Fair Value \| Level 3 \| Municipal debt securities \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 3 \| Corporate debt securities
Assets
Cash equivalents	0	0
Fair Value \| Level 3 \| Corporate debt securities \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 3 \| Asset backed securities \| Short-term investments
Assets
Investments	$ 0	0
Fair Value \| Level 3 \| Auction rate securities \| Long-term investments
Assets
Investments		$ 4,615

Fair Value Measurements - Change in Fair Values for Level 3 Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 4,615	$ 11,296
Sales, redemption and settlement	(4,550)	(6,681)
Unrealized gain (loss) included in accumulated other comprehensive income	(65)	0
Ending balance	$ 0	$ 4,615

Goodwill and Acquired Intangible Assets, Net - Additional Information (Details)	3 Months Ended	12 Months Ended
	Feb. 03, 2018 USD ($)	Feb. 03, 2018 USD ($) component segment	Jan. 28, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of operating segments \| segment		1
Number of components \| component		2
Number of reportable segments \| segment		1
Goodwill impairment	$ 0
Goodwill acquired		$ 0	$ 0
Intangibles acquired		$ 0

Goodwill and Acquired Intangible Assets, Net - Acquired Intangible Assets Net (Details) - Purchased and core technology - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	$ 25,798	$ 25,798
Accumulated Amortization and Write-Offs	(25,798)	(22,227)
Net Carrying Amounts	$ 0	$ 3,571
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Range of Useful Lives	4 years
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Range of Useful Lives	8 years

Commitments and Contingencies - Warranty Obligations (Details)	12 Months Ended
	Feb. 03, 2018
Commitments and Contingencies Disclosure [Abstract]
Standard warranty period	1 year
Extended warranty period (more than)	1 year

Commitments and Contingencies - Lease Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Rent expense, net of sublease income	$ 16.8	$ 23.7	$ 23.8

Commitments and Contingencies - Future Minimum Lease Payments, Net of Estimated Sublease Income under Operating and Capital Leases (Details) $ in Thousands	Feb. 03, 2018 USD ($)
Minimum Operating Lease Payments
2019	$ 27,200
2020	20,918
2021	8,688
2022	7,880
2023	7,729
Thereafter	5,451
Total future minimum lease payments	$ 77,866

Commitments and Contingencies - Future Minimum Payments Under Technology License Obligations (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Fiscal Year
Less: current portion	$ (28,488)	$ (21,905)
Non-current portion	34,060	$ 14,949
Technology License Obligations
Fiscal Year
2019	34,250
2020	29,605
2021	7,358
Total future minimum lease payments	71,213
Less: amount representing interest	(1,493)
Present value of future minimum payments	69,720
Less: current portion	(25,998)
Non-current portion	$ 43,722

Commitments and Contingencies - Purchase Commitments (Details) $ in Millions	Feb. 03, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase commitment, outstanding commitment	$ 145.6

Commitments and Contingencies - Contingencies (Details) - Luna Litigation and Consolidated Cases $ in Millions			1 Months Ended	12 Months Ended
	Oct. 12, 2016	Sep. 11, 2015 claim	Dec. 19, 2017 USD ($)	Feb. 03, 2018 USD ($)
Loss Contingencies [Line Items]
Number of additional claims consolidated \| claim		2
Plaintiff's period to file an amended complaint	30 days
Loss contingency, damages sought			$ 72.5
Litigation settlement, amount				$ 74.4

Commitments and Contingencies - Carnegie Mellon University Settlement (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016
Settlement Agreement and Patent License
Loss Contingencies [Line Items]
Litigation settlement, amount	$ 750.0
CMU Litigation
Loss Contingencies [Line Items]
Litigation settlement, amount	$ 6.2
CMU Litigation \| Cost of Goods Sold for Past Use
Loss Contingencies [Line Items]
Litigation settlement, amount		$ 81.3
CMU Litigation \| Mutual Release of Claims and Covenant Not to Sue Provisions \| Operating Expenses
Loss Contingencies [Line Items]
Litigation settlement, amount		654.7
CMU Litigation \| Future License Settlement \| Cost of Goods Sold for Past Use
Loss Contingencies [Line Items]
Litigation settlement, amount		$ 14.0

Shareholders’ Equity - Preferred and Common Stock (Details) - $ / shares	Feb. 03, 2018	Jan. 28, 2017
Equity [Abstract]
Preferred stock, shares authorized	8,000,000	8,000,000
Preferred stock, par value (in usd per share)	$ 0.002	$ 0.002
Common stock, shares authorized	992,000,000	992,000,000
Common stock, par value (in usd per share)	$ 0.002	$ 0.002
Preferred stock, shares outstanding	0	0

Shareholders’ Equity - Restricted Stock Unit Withholdings (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax withholdings related to net share settlement of restricted stock units	$ 26,840	$ 16,679	$ 24,355
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares withheld	1.7	1.7
Tax withholdings related to net share settlement of restricted stock units	$ 26,800	$ 16,700

Shareholders’ Equity - Cash Dividends on Shares of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 15, 2018	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Equity [Abstract]
Cash dividends paid (in usd per share)		$ 0.24	$ 0.24	$ 0.24
Payments of dividends		$ 119,251	$ 122,292	$ 122,821
Subsequent Event [Line Items]
Cash dividends declared per share (in usd per share)		$ 0.24	$ 0.24	$ 0.24
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per share (in usd per share)	$ 0.06

Shareholders’ Equity - Stock Repurchase Program (Narrative) (Details) - USD ($) shares in Thousands	12 Months Ended			90 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016	Feb. 03, 2018	Nov. 17, 2016
Equity [Abstract]
Share repurchase program, amount authorized			$ 3,250,000,000.00		$ 1,000,000,000
Number of shares repurchased	31,460	13,303	19,700	286,400
Amount of shares repurchased	$ 526,075,000	$ 183,064,000	$ 260,875,000	$ 3,800,000,000
Share repurchase program, remaining available for future share repurchases	$ 358,000,000			$ 358,000,000

Shareholders’ Equity - Stock Repurchase Program Roll Forward (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended			90 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016	Feb. 03, 2018
Shares Repurchased
Cumulative balance at beginning of period (in shares)	254,904	241,602	221,901
Repurchase of common stock under the stock repurchase program (in shares)	31,460	13,303	19,700	286,400
Cumulative balance at end of period (in shares)	286,365	254,904	241,602	286,365
Weighted- Average Price per Share
Cumulative balance at beginning of period (in usd per share)	$ 12.75	$ 12.70	$ 12.65
Repurchase of common stock under the stock repurchase program (in usd per share)	16.72	13.76	13.24
Cumulative balance at end of period (in usd per share)	$ 13.19	$ 12.75	$ 12.70	$ 13.19
Amount Repurchased
Cumulative balance at beginning of period	$ 3,250,481,000	$ 3,067,418,000	$ 2,806,543,000
Repurchase of common stock under the stock repurchase program	526,075,000	183,064,000	260,875,000	$ 3,800,000,000
Cumulative balance at end of period	3,776,557,000	3,250,481,000	3,067,418,000	3,776,557,000
Stock repurchases pending settlement	$ 0	$ 1,500,000	$ 0	$ 0

Employee Benefit Plans - 1995 Stock Option Plan (Details) - 1995 Stock Option Plan shares in Millions	12 Months Ended
	Feb. 03, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance, authorized	383.4
Equity awards, expiration period	10 years
Number of shares available for future issuance	96.5
Incentive Stock Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards, vesting period	2 years
Incentive Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards, vesting period	5 years
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards, vesting period	3 years
Expected achievement percentage of performance awards	100.00%
Performance-Based RSUs \| Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award service period	3 years
Performance-Based RSUs \| Executive Officers \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards that can be earned as a percentage of target	0.00%
Performance-Based RSUs \| Executive Officers \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards that can be earned as a percentage of target	200.00%
Market-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected achievement percentage of performance awards	100.00%
Market-Based RSUs \| Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award service period	3 years
Market-Based RSUs \| Executive Officers \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards that can be earned as a percentage of target	0.00%
Market-Based RSUs \| Executive Officers \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards that can be earned as a percentage of target	150.00%

Employee Benefit Plans - Outside Director Equity Compensation Policy (Details) - Outside Director Equity Compensation Policy - RSUs $ in Thousands	12 Months Ended
	Feb. 03, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards, aggregate fair market value \| $	$ 220
Equity awards, vesting percentage	100.00%
Equity awards, vesting period	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares	20,000

Employee Benefit Plans - Employee Stock Purchase Plan (Details) - the ESPP - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum subscription rate	15.00%
Look-back period	24 months
Percentage discount of purchase price per share of common shares	85.00%
Offering period	2 years
Purchase period	6 months
Number of shares issued	7.0	2.3	5.9
Weighted-average price (in usd per share)	$ 7.49	$ 7.33	$ 10.00
Unamortized compensation expense	$ 30.1
Number of shares available for future issuance	22.5

Employee Benefit Plans - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	$ 86,689	$ 113,970	$ 133,779
Continuing operations
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	85,122	101,400	122,766
Continuing operations \| Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	6,646	8,334	7,787
Continuing operations \| Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	52,127	74,809	88,897
Continuing operations \| Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	26,349	18,257	26,082
Discontinued operations
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	1,567	12,570	11,013
Discontinued operations \| Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	(11)	187	129
Discontinued operations \| Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	1,458	11,633	9,895
Discontinued operations \| Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	$ 120	$ 750	$ 989

Employee Benefit Plans - Share-based Compensation (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation capitalized in inventory	$ 1,300	$ 900	$ 1,500
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	(86,689)	$ (113,970)	$ (133,779)
Certain Members of Executive Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 2,400

Employee Benefit Plans - Restricted Stock Unit Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Time-Based
Number of Shares
Beginning Balance (in shares)	9,925	8,343	9,748
Granted (in shares)	8,154	9,139	5,689
Vested (in shares)	(5,653)	(5,490)	(5,139)
Canceled/Forfeited (in shares)	(2,137)	(2,067)	(1,955)
Ending Balance (in shares)	10,289	9,925	8,343
Weighted Average Grant Date Fair Value
Beginning Balance (in usd per share)	$ 10.52	$ 13.57	$ 14.84
Granted (in usd per share)	15.33	9.83	12.88
Vested (in usd per share)	10.86	13.95	15.06
Canceled/Forfeited (in usd per share)	11.95	10.69	13.99
Ending Balance (in usd per share)	$ 13.84	$ 10.52	$ 13.57
Performance-Based
Number of Shares
Beginning Balance (in shares)	313	977	1,254
Granted (in shares)	406	366	669
Vested (in shares)	0	(155)	(658)
Canceled/Forfeited (in shares)	(47)	(875)	(288)
Ending Balance (in shares)	672	313	977
Weighted Average Grant Date Fair Value
Beginning Balance (in usd per share)	$ 13.91	$ 14.43	$ 14.99
Granted (in usd per share)	14.49	13.91	14.08
Vested (in usd per share)	0.00	14.15	15.15
Canceled/Forfeited (in usd per share)	13.99	14.45	14.39
Ending Balance (in usd per share)	$ 14.25	$ 13.91	$ 14.43
Market-Based
Number of Shares
Beginning Balance (in shares)	559	353
Granted (in shares)	409	612	407
Vested (in shares)	0	0	0
Canceled/Forfeited (in shares)	(47)	(406)	(54)
Ending Balance (in shares)	921	559	353
Weighted Average Grant Date Fair Value
Beginning Balance (in usd per share)	$ 11.80	$ 12.24
Granted (in usd per share)	15.14	11.94	12.24
Vested (in usd per share)	0.00	0.00	0.00
Canceled/Forfeited (in usd per share)	14.71	12.39	12.24
Ending Balance (in usd per share)	$ 13.14	$ 11.80	$ 12.24
Total
Number of Shares
Beginning Balance (in shares)	10,797	9,673	11,002
Granted (in shares)	8,969	10,117	6,765
Vested (in shares)	(5,653)	(5,645)	(5,797)
Canceled/Forfeited (in shares)	(2,231)	(3,348)	(2,297)
Ending Balance (in shares)	11,882	10,797	9,673
Weighted Average Grant Date Fair Value
Beginning Balance (in usd per share)	$ 10.69	$ 13.61	$ 14.85
Granted (in usd per share)	15.28	10.11	12.96
Vested (in usd per share)	10.86	13.95	15.07
Canceled/Forfeited (in usd per share)	12.05	11.88	14.00
Ending Balance (in usd per share)	$ 13.81	$ 10.69	$ 13.61
Total \| Executive Officers \| Maximum
Weighted Average Grant Date Fair Value
Equity awards, vesting percentage	200.00%

Employee Benefit Plans - Restricted Stock and Stock Unit Awards (Narrative) (Details) - RSUs shares in Millions, $ in Millions	12 Months Ended
	Feb. 03, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value expected to vest	$ 266.5
Number of shares expected to vest \| shares	11.9
Unamortized compensation expense	$ 118.4
Unrecognized share based compensation cost, weighted-average period of recognition (in years)	1 year 11 months

Employee Benefit Plans - Stock Option Plan Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Number of Shares
Balance at beginning of period (in shares)	25,096	43,030	49,372
Granted (in shares)	0	2,104	6,170
Exercised (in shares)	(10,305)	(5,558)	(2,225)
Canceled/Forfeited (in shares)	(3,019)	(14,480)	(10,287)
Balance at end of period (in shares)	11,772	25,096	43,030
Weighted Average Exercise Price
Balance at beginning of period (in usd per share)	$ 12.61	$ 13.68	$ 13.88
Granted (in usd per share)	0.00	9.99	14.13
Exercised (in usd per share)	12.38	10.35	9.79
Canceled/Forfeited (in usd per share)	14.33	16.29	15.68
Balance at end of period (in usd per share)	$ 12.36	$ 12.61	$ 13.68
Time-Based Options
Number of Shares
Balance at beginning of period (in shares)	25,096	40,874	47,140
Granted (in shares)	0	2,104	6,170
Exercised (in shares)	(10,305)	(5,558)	(2,225)
Canceled/Forfeited (in shares)	(3,019)	(12,324)	(10,211)
Balance at end of period (in shares)	11,772	25,096	40,874
Vested or expected to vest at end of period (in shares)	11,772
Weighted Average Exercise Price
Balance at beginning of period (in usd per share)	$ 12.61	$ 13.59	$ 13.79
Granted (in usd per share)	0.00	9.99	14.13
Exercised (in usd per share)	12.38	10.35	9.79
Canceled/Forfeited (in usd per share)	14.33	16.44	15.68
Balance at end of period (in usd per share)	12.36	$ 12.61	$ 13.59
Vested or expected to vest at end of period (in usd per share)	$ 12.36
Market-Based Options
Number of Shares
Balance at beginning of period (in shares)	0	2,156	2,232
Granted (in shares)	0	0	0
Exercised (in shares)	0	0	0
Canceled/Forfeited (in shares)	0	(2,156)	(76)
Balance at end of period (in shares)	0	0	2,156
Weighted Average Exercise Price
Balance at beginning of period (in usd per share)	$ 0.00	$ 15.43	$ 15.43
Granted (in usd per share)	0.00	0.00	0.00
Exercised (in usd per share)	0.00	0.00	0.00
Canceled/Forfeited (in usd per share)	0.00	15.43	15.43
Balance at end of period (in usd per share)	$ 0.00	$ 0.00	$ 15.43

Employee Benefit Plans - Option Plan and Stock Award Activity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vested and expected to vest, aggregate intrinsic value	$ 118.6
Options exercisable, aggregate intrinsic value	84.5
Aggregate intrinsic value of stock options exercised	$ 57.0	$ 19.8	$ 9.7
Closing stock price (in usd per share)	$ 22.43
Unamortized compensation expense for stock options	$ 4.5
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share based compensation cost, weighted-average period of recognition (in years)	11 months

Employee Benefit Plans - Schedule of Outstanding Options and Exercisable Options Information, by Range of Exercise Prices (Details) shares in Thousands	12 Months Ended
	Feb. 03, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Options, Number of Shares \| shares	11,772
Outstanding Options, Weighted Average Remaining Contractual Term (in Years)	5 years 2 months 19 days
Outstanding Options, Weighted Average Exercise Price (in usd per share)	$ 12.36
Exercisable Options, Number of Shares \| shares	7,774
Exercisable Options, Weighted Average Exercise Price (in usd per share)	$ 11.55
Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit (in usd per share)	5.70
Range of Exercise Prices, Upper Limit (in usd per share)	$ 10.47
Outstanding Options, Number of Shares \| shares	2,083
Outstanding Options, Weighted Average Remaining Contractual Term (in Years)	3 years 9 months 14 days
Outstanding Options, Weighted Average Exercise Price (in usd per share)	$ 8.02
Exercisable Options, Number of Shares \| shares	1,463
Exercisable Options, Weighted Average Exercise Price (in usd per share)	$ 7.32
Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit (in usd per share)	10.76
Range of Exercise Prices, Upper Limit (in usd per share)	$ 10.76
Outstanding Options, Number of Shares \| shares	3,400
Outstanding Options, Weighted Average Remaining Contractual Term (in Years)	5 years 2 months 23 days
Outstanding Options, Weighted Average Exercise Price (in usd per share)	$ 10.76
Exercisable Options, Number of Shares \| shares	3,398
Exercisable Options, Weighted Average Exercise Price (in usd per share)	$ 10.76
Range Three
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit (in usd per share)	10.80
Range of Exercise Prices, Upper Limit (in usd per share)	$ 14.35
Outstanding Options, Number of Shares \| shares	3,226
Outstanding Options, Weighted Average Remaining Contractual Term (in Years)	6 years 10 days
Outstanding Options, Weighted Average Exercise Price (in usd per share)	$ 13.56
Exercisable Options, Number of Shares \| shares	982
Exercisable Options, Weighted Average Exercise Price (in usd per share)	$ 11.89
Range Four
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit (in usd per share)	14.45
Range of Exercise Prices, Upper Limit (in usd per share)	$ 15.87
Outstanding Options, Number of Shares \| shares	2,795
Outstanding Options, Weighted Average Remaining Contractual Term (in Years)	5 years 7 months 27 days
Outstanding Options, Weighted Average Exercise Price (in usd per share)	$ 15.46
Exercisable Options, Number of Shares \| shares	1,667
Exercisable Options, Weighted Average Exercise Price (in usd per share)	$ 15.42
Range Five
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit (in usd per share)	15.91
Range of Exercise Prices, Upper Limit (in usd per share)	$ 21.62
Outstanding Options, Number of Shares \| shares	268
Outstanding Options, Weighted Average Remaining Contractual Term (in Years)	2 years
Outstanding Options, Weighted Average Exercise Price (in usd per share)	$ 19.55
Exercisable Options, Number of Shares \| shares	264
Exercisable Options, Weighted Average Exercise Price (in usd per share)	$ 19.60

Employee Benefit Plans - Weighted Average Assumptions Used to Calculate Fair Value of Time Based Stock Option Award (Details) - Time-Based Options - $ / shares	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value (in usd per share)	$ 2.92	$ 3.93
Expected volatility (as a percent)	40.00%	34.00%
Expected term (in years)	5 years 2 months 12 days	5 years 4 months 24 days
Risk-free interest rate (as a percent)	1.30%	1.60%
Expected dividend yield (as a percent)	2.50%	1.80%

Employee Benefit Plans - Weighted Average Assumptions Used to Calculate Fair Value Awards for Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - $ / shares	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value (in usd per share)	$ 6.03	$ 3.83	$ 3.24
Expected volatility (as a percent)	30.00%	39.00%	41.00%
Expected term (in years)	1 year 2 months 12 days	1 year 2 months 12 days	1 year 3 months 18 days
Risk-free interest rate (as a percent)	1.60%	0.70%	0.60%
Expected dividend yield (as a percent)	1.10%	1.90%	2.40%

Employee Benefit Plans - Weighted Average Assumptions Used to Calculate Fair Value Awards of Total Shareholder Return Awards (Details) - Total Shareholder Return Awards	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	2 years 10 months 24 days	2 years 10 months 24 days	2 years
Expected volatility (as a percent)	35.00%	36.00%	27.00%
Average correlation coefficient of peer companies	0.5	0.5	0.4
Risk-free interest rate (as a percent)	1.40%	0.90%	0.50%
Expected dividend yield (as a percent)	1.60%	2.10%	1.70%

Employee Benefit Plans - Employee 401(k) Plans (Details) - USD ($)	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
United States
Defined Contribution Plan Disclosure [Line Items]
Maximum contribution per employee	$ 4,000
Matching contributions to employees	$ 4,600,000	$ 4,500,000	$ 4,900,000
United States \| Defined Contribution Plan, Tranche One
Defined Contribution Plan Disclosure [Line Items]
Employee pre-tax contributions to 401(k)	4.00%
Employer match contributions percentage	100.00%
United States \| Defined Contribution Plan, Tranche Two
Defined Contribution Plan Disclosure [Line Items]
Employee pre-tax contributions to 401(k)	2.00%
Employer match contributions percentage	50.00%
United States \| Minimum
Defined Contribution Plan Disclosure [Line Items]
Employee pre-tax contributions to 401(k)	1.00%
United States \| Maximum
Defined Contribution Plan Disclosure [Line Items]
Employee pre-tax contributions to 401(k)	50.00%
Non-U.S. Defined Contribution Plan
Defined Contribution Plan Disclosure [Line Items]
Matching contributions to employees	$ 12,300,000	$ 11,800,000	$ 14,500,000

Income Taxes - U.S. and Non-U.S. Components of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Income Tax Disclosure [Abstract]
U.S. operations	$ 24,377	$ 30,601	$ 32,095
Non-U.S. operations	426,827	116,828	(759,820)
Income before income taxes	$ 451,204	$ 147,429	$ (727,725)

Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Current income tax provision (benefit):
Federal	$ 776	$ 8,231	$ 10,413
State	2	180	83
Foreign	(2,541)	19,560	(5,876)
Total current income tax provision (benefit)	(1,763)	27,971	4,620
Deferred income tax provision (benefit):
Federal	10,136	(5,062)	(4,355)
State	83	(12)	580
Foreign	9,606	49,711	9,871
Total deferred income tax provision (benefit)	19,825	44,637	6,096
Total provision (benefit) for income taxes	$ 18,062	$ 72,608	$ 10,716

Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Deferred tax assets:
Federal and California research and other tax credits	$ 607,726	$ 450,503
Reserves and accruals	16,951	35,887
Share-based compensation	2,493	3,733
Net operating losses	11,816	5,361
Gross deferred tax assets	638,986	495,484
Valuation allowance	(618,353)	(456,541)
Total deferred tax assets	20,633	38,943
Total deferred tax liabilities	(52,204)	(51,112)
Net deferred tax assets (liabilities)	$ (31,571)	$ (12,169)

Income Taxes - Narrative (Details)	1 Months Ended		12 Months Ended				24 Months Ended
Income Taxes - Narrative (Details)	Jun. 30, 2014	Jul. 31, 1999	Feb. 03, 2018 USD ($) branch	Jan. 28, 2017 USD ($) $ / shares	Jan. 30, 2016 USD ($) $ / shares	Jan. 27, 2007	Feb. 03, 2018 USD ($) branch	Apr. 29, 2017 USD ($)
Income Taxes [Line Items]
Deferred tax assets for net operating losses available to be used			$ 8,600,000	$ 7,500,000			$ 8,600,000
Deferred tax assets for U.S. federal and California research tax credits			607,726,000	450,503,000			607,726,000
Valuation allowance			$ 618,353,000	$ 456,541,000			618,353,000
Increase in valuation allowance							161,800,000
Federal statutory tax rate			33.70%	35.00%	35.00%
Unrecognized tax benefit that would affect the effective income tax rate if recognized			$ 22,100,000				22,100,000
Unrecognized tax benefits offset by deferred tax assets			8,600,000	$ 7,500,000	$ 6,300,000
Unrecognized tax benefit, interest and penalties accrued			17,200,000	21,600,000	26,400,000		17,200,000
Interest and penalties related to unrecognized tax benefits included in consolidated statements of operation			2,300,000	$ 2,700,000	$ 4,600,000
Uncertain tax positions decrease from the lapse of the statutes of limitation in various jurisdictions during the next 12 months			10,500,000				10,500,000
Cash, cash equivalents and short-term investments			1,800,000,000				1,800,000,000
Undistributed earnings of foreign subsidiaries			630,000,000				630,000,000
Undistributed earnings of foreign earnings for which no deferred tax liability has been recognized			$ 430,000,000				$ 430,000,000
Marvell Israel
Income Taxes [Line Items]
Number of branches entitled to tax programs \| branch			2				2
Foreign Subsidiaries
Income Taxes [Line Items]
Cash, cash equivalents and short-term investments			$ 1,100,000,000				$ 1,100,000,000
Increase (decrease) in tax expense in the event of undistributed earnings needed by parent company or no longer considered indefinitely reinvested outside of Bermuda			$ 160,000,000
Office of the Tax Commissioner, Bermuda
Income Taxes [Line Items]
Applicable statutory rate			0.00%	0.00%	0.00%		0.00%
Economic Development Board of Singapore Pioneer Status
Income Taxes [Line Items]
Expiration of tax exemption, period	15 years	10 years
Tax holidays, tax savings amount			$ 0	$ 900,000	$ 3,000,000
Tax holidays, per share effect on earnings (less than) (in usd per share) \| $ / shares				$ 0.01	$ 0.01
Swiss Federal Department of Economy and the Vaud Cantonal Tax Administration Tax Holiday
Income Taxes [Line Items]
Expiration of tax exemption, period						10 years
Tax holidays, tax savings amount			0	$ 0	$ 3,700,000
Tax holidays, per share effect on earnings (less than) (in usd per share) \| $ / shares					$ 0.01
Foreign
Income Taxes [Line Items]
Net operating loss carryforwards			108,400,000				$ 108,400,000
Federal
Income Taxes [Line Items]
Net operating loss carryforwards			1,200,000				1,200,000
Federal \| Research Tax Credit
Income Taxes [Line Items]
Tax credit carryforwards			286,400,000				286,400,000
State \| California
Income Taxes [Line Items]
Net operating loss carryforwards			5,700,000				5,700,000
State \| California \| Research Tax Credit
Income Taxes [Line Items]
Tax credit carryforwards			298,300,000				298,300,000
State \| Other State \| Research and Investment Tax Credit
Income Taxes [Line Items]
Tax credit carryforwards			$ 24,500,000				$ 24,500,000
ASU 2016-09
Income Taxes [Line Items]
Deferred tax assets for U.S. federal and California research tax credits								$ 123,000,000

Income Taxes - Reconciliation Between the Provision (Benefit) for Income Taxes at the Statutory Rate and the Effective Tax Rate (Details)	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Income Tax Disclosure [Abstract]
Provision at U.S. notional statutory rate	33.70%	35.00%	35.00%
Difference in U.S. and non-U.S. tax rates	(31.70%)	(26.30%)	(37.10%)
Benefits from utilization of general business credits	(4.80%)	(28.40%)	5.50%
Change in valuation allowance	4.70%	24.30%	(4.40%)
Withholding taxes	0.00%	34.00%	0.00%
Tax effects of global restructuring	0.00%	11.40%	0.00%
Other	2.10%	(0.70%)	(0.50%)
Effective tax rate	4.00%	49.30%	(1.50%)

Income Taxes - Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits as of the beginning of the period	$ 23,793	$ 29,139	$ 45,197
Increases related to prior year tax positions	0	2,080	304
Decreases related to prior year tax positions	0		(4,334)
Increases related to current year tax positions	2,776	2,363	4,237
Settlements	0	0	(704)
Lapse in the statute of limitations	(3,341)	(6,576)	(9,739)
Foreign exchange gain	24
Foreign exchange gain		(3,213)	(5,822)
Gross amounts of unrecognized tax benefits as of the end of the period	$ 23,252	$ 23,793	$ 29,139

Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Numerator:
Income (loss) from continuing operations, net of tax	$ 433,142	$ 74,821	$ (738,441)
Income (loss) from discontinued operations, net of tax	87,689	(53,670)	(72,959)
Net income (loss)	$ 520,831	$ 21,151	$ (811,400)
Denominator:
Weighted average shares — basic	498,008	509,738	510,945
Effect of dilutive securities:
Share-based awards (in shares)	11,659	7,775	0
Weighted average shares — diluted	509,667	517,513	510,945
Income (loss) from continuing operations per share:
Basic (in usd per share)	$ 0.87	$ 0.15	$ (1.45)
Diluted (in usd per share)	0.85	0.14	(1.45)
Income (loss) from discontinued operations per share:
Basic (in usd per share)	0.18	(0.11)	(0.14)
Diluted (in usd per share)	0.17	(0.10)	(0.14)
Net income (loss) per share:
Net Income (loss) per share - Basic (in usd per share)	1.05	0.04	(1.59)
Net Income (loss) per share - diluted (in usd per share)	$ 1.02	$ 0.04	$ (1.59)

Net Income (Loss) Per Share - Anti-dilutive Potential Shares (Details) - shares shares in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Weighted average shares outstanding:
Share-based awards	412	22,642	64,420

Segment and Geographic Information - Additional Information (Details)	12 Months Ended
	Feb. 03, 2018 segment
Segment Reporting [Abstract]
Number of reportable segments	1

Segment and Geographic Information - Net Revenue and Long-Lived Asset Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 2,409,170	$ 2,300,992	$ 2,602,497
Property and equipment, net	202,222	243,397
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	1,205,202	1,224,032	1,471,180
Property and equipment, net	10,145	16,484
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	388,469	286,267	302,953
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	270,101	283,345	211,602
Thailand
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	137,662	113,778	189,299
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	42,560	51,416	60,119
Property and equipment, net	156,053	147,552
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	15,827	54,054
Israel
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	12,686	12,133
Others
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	365,176	342,154	$ 367,344
Property and equipment, net	$ 7,511	$ 13,174

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Allowance for doubtful accounts and sales return reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,384	$ 2,762	$ 2,112
Additions	2,352	4,456	2,614
Deductions	(1,236)	(5,834)	(1,964)
Balance at End of Year	2,500	1,384	2,762
Deferred tax valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	456,541	424,914	382,796
Additions	161,812	31,627	42,118
Deductions	0	0	0
Balance at End of Year	$ 618,353	$ 456,541	$ 424,914