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Document and Entity Information - shares shares in Millions	3 Months Ended
Document and Entity Information - shares shares in Millions	Apr. 29, 2017	May 30, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 29, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	MRVL
Entity Registrant Name	MARVELL TECHNOLOGY GROUP LTD
Entity Central Index Key	0001058057
Current Fiscal Year End Date	--01-28
Entity File Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		502.6

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Current assets:
Cash and cash equivalents	$ 725,962	$ 814,092
Short-term investments	923,449	854,268
Accounts receivable, net	357,147	335,384
Inventories	178,145	171,969
Prepaid expenses and other current assets	44,577	58,771
Assets held for sale	39,708	45,846
Total current assets	2,268,988	2,280,330
Property and equipment, net	239,358	243,397
Goodwill and acquired intangible assets, net	2,005,912	2,006,984
Other non-current assets	121,979	117,939
Total assets	4,636,237	4,648,650
Current liabilities:
Accounts payable	179,017	143,484
Accrued liabilities	154,315	143,491
Accrued employee compensation	132,118	139,647
Deferred income	74,064	68,124
Liabilities held for sale	746	1,670
Total current liabilities	540,260	496,416
Non-current income taxes payable	62,720	60,646
Other non-current liabilities	71,411	63,937
Total liabilities	674,391	620,999
Commitments and contingencies (Note 9)
Shareholders’ equity:
Common shares, $0.002 par value	1,001	1,012
Additional paid-in capital	2,876,507	3,016,775
Accumulated other comprehensive income (loss)	(164)	23
Retained earnings	1,084,502	1,009,841
Total shareholders’ equity	3,961,846	4,027,651
Total liabilities and shareholders’ equity	$ 4,636,237	$ 4,648,650

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Apr. 29, 2017	Jan. 28, 2017
Statement of Financial Position [Abstract]
Common shares, par value (in usd per share)	$ 0.002	$ 0.002

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Income Statement [Abstract]
Net revenue	$ 579,180	$ 519,383
Cost of goods sold	230,549	244,354
Gross profit	348,631	275,029
Operating costs and expenses:
Research and development	193,027	226,541
Selling, general and administrative	55,211	64,163
Restructuring related charges	1,505	4,441
Total operating expenses	249,743	295,145
Operating income (loss)	98,888	(20,116)
Interest and other income, net	3,333	1,488
Income (loss) from continuing operations before income taxes	102,221	(18,628)
Provision (benefit) for income taxes	5,251	(5,357)
Income (loss) from continuing operations	96,970	(13,271)
Income (loss) from discontinued operations, net of tax	9,651	(9,408)
Net income (loss)	$ 106,621	$ (22,679)
Net income (loss) per share - Basic:
Continuing operations (in usd per share)	$ 0.19	$ (0.03)
Discontinued operations (in usd per share)	0.02	(0.02)
Net income (loss) per share - basic (in usd per share)	0.21	(0.04)
Net income (loss) per share - Diluted:
Continuing operations (in usd per share)	0.19	(0.03)
Discontinued operations (in usd per share)	0.02	(0.02)
Net income (loss) per share - diluted (in usd per share)	$ 0.21	$ (0.04)
Weighted average shares:
Basic (in shares)	503,790	508,794
Diluted (in shares)	517,592	508,794
Cash dividends declared per share (in usd per share)	$ 0.06	$ 0.06

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 106,621	$ (22,679)
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on marketable securities	(673)	2,433
Net change in unrealized gain on cash flow hedges	1,758	584
Net change in pension liability	(1,272)	0
Other comprehensive income (loss), net of tax	(187)	3,017
Comprehensive income (loss), net of tax	$ 106,434	$ (19,662)

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 106,621	$ (22,679)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	20,742	27,114
Share-based compensation	24,017	24,453
Amortization and write-off of acquired intangible assets	1,071	2,946
Restructuring related charges	(516)	896
Deferred income taxes and other	(11,109)	(1,115)
Gain on sale of a business	(8,155)	0
Changes in assets and liabilities:
Accounts receivable	(21,763)	42,642
Inventories	(11,542)	13,598
Prepaid expenses and other assets	6,422	(13,217)
Accounts payable	31,423	19,922
Accrued liabilities	448	(22,502)
Carnegie Mellon University accrued litigation settlement	0	(736,000)
Accrued employee compensation	(7,529)	7,152
Deferred income	5,016	(1,234)
Net cash provided by (used in) operating activities	135,146	(658,024)
Cash flows from investing activities:
Purchases of available-for-sale securities	(198,416)	(93,365)
Sales of available-for-sale securities	78,764	272,271
Maturities of available-for-sale securities	82,235	97,788
Purchase of time deposits	(75,000)	(50,000)
Maturities of time deposits	75,000	0
Purchases of technology licenses	(1,093)	(4,050)
Purchases of property and equipment	(10,026)	(11,868)
Net proceeds from sale of a business	22,954	0
Other	7,275	0
Net cash provided by (used in) investing activities	(18,307)	210,776
Cash flows from financing activities:
Repurchases of common stock	(166,293)	0
Proceeds from employee stock plans	19,939	315
Minimum tax withholding paid on behalf of employees for net share settlement	(21,809)	(15,270)
Dividend payments to shareholders	(29,991)	(30,461)
Payments on technology license obligations	(6,815)	(5,294)
Net cash used in financing activities	(204,969)	(50,710)
Net decrease in cash and cash equivalents	(88,130)	(497,958)
Cash and cash equivalents at beginning of period	814,092	1,278,180
Cash and cash equivalents at end of period	$ 725,962	$ 780,222

Basis of Presentation	3 Months Ended
Basis of Presentation	Apr. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements of Marvell Technology Group Ltd., a Bermuda exempted company, and its wholly owned subsidiaries (the “Company”), as of and for the three months ended April 29, 2017, have been prepared as required by the U.S. Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted as permitted by the SEC. These unaudited condensed consolidated financial statements and related notes should be read in conjunction with the Company's fiscal year 2017 audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended January 28, 2017. In the opinion of management, the financial statements include all adjustments, including normal recurring adjustments and other adjustments, that are considered necessary for fair presentation of the Company’s financial position and results of operations. All inter-company accounts and transactions have been eliminated. Operating results for the periods presented herein are not necessarily indicative of the results that may be expected for the entire year. Certain prior year amounts have been reclassified to conform to current year presentation. These amounts were not material to any of the periods presented. 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 2017 had a 52-week year. Fiscal 2018 is a 53-week year. 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 quarter ended April 29, 2017 and an increase in 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 quarter.

Recent Accounting Pronouncements	3 Months Ended
Recent Accounting Pronouncements	Apr. 29, 2017
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	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 is effective for annual and interim reporting periods beginning after December 15, 2016. Adoption of this guidance 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 is 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 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 is 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 plans to adopt the standard on a modified retrospective basis, with the cumulative effect recognized at adoption. This plan of adoption is a change in the method that the Company had previously disclosed and is a result of the continued assessment and evaluation of the impacts of implementation on the Company. The Company’s initial assessment has identified a change in revenue recognition timing on our component sales made to distributors. The Company expects to recognize revenue when the Company delivers to the distributor rather than deferring recognition until the distributor sells the components. Other changes may be identified as the Company continues completion of the assessment and implementation planning phases. On the date of initial adoption, the Company will remove the deferred net revenue on component sales made to distributors through a cumulative adjustment to retained earnings. The Company expects the revenue and corresponding cost of goods sold deferral to be offset by the acceleration of revenue recognition as control of the product transfers to the Company's customer. To date, the Company has completed the assessment phase of its revenue project and is currently in the implementation, planning, design and development phase, identifying systems and process changes necessary to enable compliance with the new standard. As a result of further analysis of the requirements of the new standard, the Company has decided to apply the amendments on a modified retrospective basis, although it may decide to change at a later date. The Company will continue to monitor relevant elements and finalize its evaluation of any changes to its accounting policies and disclosures. 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 Company is currently evaluating the impact of this accounting standard update on its 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 probable 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 the Company's 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. Early adoption is permitted, including adoption in an interim period. The Company does not expect the adoption of this guidance to have a material effect on its 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. Early adoption is permitted, including adoption in an interim period. The Company does not expect the adoption of this guidance to have a material effect on its 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 is evaluating the effect this new guidance will have 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. Early adoption is permitted. The guidance is required to be applied prospectively to an award modified on or after the adoption date. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.

- Definition

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

+ References

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+ Details

Discontinued Operations

3 Months Ended

Apr. 29, 2017

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 those 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.

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 million in cash proceeds. The divestiture resulted in a pre-tax gain on sale of $8.2 million, which is included within income from discontinued operations in the consolidated statements of operations. In connection with the divestiture of the Broadband operations, the Company and the acquiror entered into Transition Service Agreements pursuant to which the Company will provide the acquiror certain services within twelve months following the sale, including financial support services, information technology services and engineering services.

During the first quarter of fiscal 2018, the Company entered into a non-binding term sheet with a buyer for the sale of a second business. This business continues to be presented as discontinued operations on the consolidated statements of operations as of April 29, 2017. The Company believes the business will be sold within fiscal 2018.

The Company continues its effort to sell a third business. As of the fiscal quarter ended April 29, 2017, management did not believe the sale would be completed within the next twelve months due to the high level of uncertainty of the buyer obtaining the required foreign government approvals. Due to such uncertainty, the business did not meet the criteria to be presented as discontinued operations as of the balance sheet date. Subsequent to the Company’s first quarter of fiscal 2018, this business was sold for a purchase price of $45 million in cash. In the second quarter of fiscal year 2018, the Company will classify this business as discontinued operations for all periods presented in its consolidated financial statements starting with the filing of its Form 10-Q for the three and six months ended July 29, 2017.

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):



	April 29, 2017		January 28, 2017
Assets held for sale:
Inventory	$	13,498	$	8,154
Property and equipment, net	1,193		2,898
Goodwill	20,775		26,532
Acquired intangible assets, net	—		3,799
Other	1,490		1,490
Assets held for sale for discontinued operations	36,956		42,873
Other assets held for sale	2,752		2,973
Total assets of the disposal group classified as held for sale	$	39,708	$	45,846

Liabilities held for sale:
Deferred income	$	746	$	1,670

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 statements of operations (in thousands):



	Three Months Ended
	April 29, 2017		April 30, 2016
Net revenue	$	32,555	$	21,439
Operating costs and expenses:
Cost of goods sold	16,757		14,856
Research and development	12,065		13,917
Selling, general and administrative	1,624		1,672
Operating costs and expenses	30,446		30,445
Income (loss) from discontinued operations before income taxes	2,109		(9,006		)
Gain from sale of a business	8,155		—
Provision for income taxes	613		402
Income (loss) from discontinued operations, net of tax	$	9,651	$	(9,408	)

The Company has elected not to report separately discontinued operations in its consolidated statements of cash flows since its effect is not material. Non-cash operating amounts reported for discontinued operations include share-based compensation expense of $1.7 million and $2.3 million for the three months ended April 29, 2017 and April 30, 2016, respectively. Depreciation, amortization and capital expenditures are not material. The proceeds from sale of the Broadband business of $23.0 million are classified in investing activities for the three months ended April 29, 2017, and the gain on sale of such business is presented in operating activities. Due to the Company's transfer pricing arrangements, the Company generates income in most jurisdictions in which it operates, regardless if there is a loss on a consolidated basis. As such, the Company has reflected tax expense of $0.6 million and $0.4 million for three months ended April 29, 2017 and April 30, 2016, respectively, attributable to discontinued operations.

- Definition

The entire disclosure 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.

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-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

+ Details

Restructuring Related Charges

3 Months Ended

Apr. 29, 2017

Restructuring and Related Activities [Abstract]

Restructuring Related Charges

In November 2016, the Company announced a restructuring plan intended to refocus its research and development, increase operational efficiency and improve profitability. As a continuation of such plan, the Company recorded restructuring related charges of $1.5 million during the first quarter of fiscal 2018. The following table presents details of charges recorded by the Company related to the restructuring actions described below (in thousands):



	Three Months Ended
	April 29, 2017			April 30, 2016
Restructuring related charges:
Severance and related costs	$	2,827		$	—
Facilities and related costs	(399		)	3,631
Other exit-related costs	380			—
	2,808			3,631
Release of reserves:
Severance	(717		)	(86		)
Other exit-related	(70		)	—
	(787		)	(86		)
Impairment and write-off of assets:
Technology license	174			—
Equipment and other	(690		)	896
	(516		)	896

Restructuring related charges	$	1,505		$	4,441

First quarter fiscal 2018. The Company recorded restructuring related charges of $1.5 million in the first quarter of fiscal 2018 related to the restructuring plan announced in November 2016. The charges included $2.8 million of severance benefits and other exit-related costs, and $0.2 million for the impairment of technology licenses, offset by $0.8 million release of reserve and $0.7 million gain on disposal of equipment. The Company is on track to complete activities related to the restructuring plan as previously announced.

First quarter fiscal 2017. In connection with the Company’s decision to further reduce its research and development operations in Israel as announced in May 2015, the Company recorded a $3.6 million charge for its remaining lease obligation, net of estimated sublease income, associated with the floors it vacated. In connection with the restructuring of its mobile platform business announced in September 2015, the Company also recorded net charges of $0.8 million, primarily for the write off of certain mobile-related equipment it originally identified as held for sale since it was unable to locate a buyer.

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 28, 2017	$	17,000		$	1,763		$	4,625		$	—	$	711		$	—	$	24,099
Restructuring charges	2,827			(578		)	380			—		179			—		2,808
Net cash payments	(3,042		)	(368		)	(56		)	—		(504		)	—		(3,970		)
Release of reserves	(717		)	(70		)	—			—		—			—		(787		)
Balance at April 29, 2017	$	16,068		$	747		$	4,949		$	—	$	386		$	—	$	22,150

During the first quarter of fiscal 2018, the Company paid severance and related benefit costs to approximately 80 employees whose employment terminated during the quarter as part of the restructuring actions described above. The remaining accrued 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, and is expected to be paid within the next two quarters of fiscal 2018. The balance at April 29, 2017 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 the second quarter of fiscal 2018.

Supplemental Financial Information

3 Months Ended

Apr. 29, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Financial Information

Supplemental Financial Information (in thousands)

Consolidated Balance Sheets



	April 29, 2017		January 28, 2017
Inventories:
Work-in-process	$	119,035	$	110,083
Finished goods	59,110		61,886
Total inventories	$	178,145	$	171,969

Inventory held by third-party logistics providers is recorded as consigned inventory on the Company’s condensed consolidated balance sheet. The amount of inventory held at third-party logistics providers was $27.1 million and $26.5 million at April 29, 2017 and January 28, 2017, respectively.



	April 29, 2017			January 28, 2017
Property and equipment, net:
Machinery and equipment	$	522,366		$	578,248
Buildings and building improvements	194,389			194,290
Computer software	93,533			99,186
Land	53,373			53,373
Leasehold improvements	47,852			49,004
Furniture and fixtures	23,530			23,903
Construction in progress	11,169			11,240
	946,212			1,009,244
Less: Accumulated depreciation and amortization	(706,854		)	(765,847		)
Total property and equipment, net	$	239,358		$	243,397

Current accrued liabilities are comprised of the following at April 29, 2017 and January 28, 2017, respectively:



	April 29, 2017		January 28, 2017
Accrued liabilities:
Unsettled investment trades	$	40,299	$	15,371
Restructuring liability	21,827		23,150
Accrued royalties	16,802		17,349
Technology license obligations	15,508		21,905
Accrued rebates	14,149		26,095
Accrued legal expense	7,155		5,127
Other	38,575		34,494
Total accrued liabilities	$	154,315	$	143,491

Unsettled investment trades represent the accrual to address the timing difference between trade date and cash settlement date.



	April 29, 2017			January 28, 2017
Deferred income:
Deferred revenue	$	99,498		$	93,148
Deferred cost of goods sold	(25,434		)	(25,024		)
Deferred income	$	74,064		$	68,124



	April 29, 2017		January 28, 2017
Other non-current liabilities:
Deferred tax liabilities	$	50,850	$	38,777
Technology license obligations	13,612		14,949
Long-term accrued employee compensation	5,427		4,075
Other	1,522		6,136
Other non-current liabilities	$	71,411	$	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			Unrealized Gain (Loss) on Auction Rate Securities		Unrealized Gain (Loss) on Cash Flow Hedges			Net Change in Pension Liability			Total
Balance at January 28, 2017	$	(801	)	$	—	$	824		$	—		$	23
Other comprehensive income (loss) before reclassifications	(714		)	—		1,838			(1,272		)	(148		)
Amounts reclassified from accumulated other comprehensive income (loss)	41			—		(80		)	—			(39		)
Other comprehensive income (loss)	(673		)	—		1,758			(1,272		)	(187		)
Balance at April 29, 2017	$	(1,474	)	$	—	$	2,582		$	(1,272	)	$	(164	)



	Unrealized Gain (Loss) on Marketable Securities			Unrealized Gain (Loss) on Auction Rate Securities		Unrealized Gain (Loss) on Cash Flow Hedges			Total
Balance at January 30, 2016	$	(656	)	$	—	$	(139	)	$	(795	)
Other comprehensive income before reclassifications	2,317			—		527			2,844
Amounts reclassified from accumulated other comprehensive income	116			—		57			173
Other comprehensive income	2,433			—		584			3,017
Balance at April 30, 2016	$	1,777		$	—	$	445		$	2,222

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



	Three Months Ended
Affected Line Item in the Statements of Operations:	April 29, 2017			April 30, 2016
Interest and other income, net:
Available-for-sale securities:
Marketable securities	$	(41	)	$	(116	)
Operating costs and expenses:
Cash flow hedges:
Research and development	71			(51		)
Selling, general and administrative	9			(6		)
Total	$	39		$	(173	)

Consolidated Statements of Operations



	Three Months Ended
	April 29, 2017			April 30, 2016
Interest and other income, net:
Interest income	$	3,512		$	3,442
Net realized gain on investments	25			164
Currency translation loss	(90		)	(1,941		)
Other expense	(63		)	(59		)
Interest expense	(51		)	(118		)
	$	3,333		$	1,488

Share Repurchase Program

The Company repurchased 10.5 million of its common shares for $164.8 million during the three months ended April 29, 2017. There were no shares repurchased during the three months ended April 30, 2016. The repurchased shares were retired immediately after the repurchases were completed.

As of April 29, 2017, a total of 265.4 million shares have been repurchased to date under the Company’s share repurchase program for a total $3.4 billion in cash and there was $719.2 million remaining available for future share repurchases.

Subsequent to the end of the quarter, the Company repurchased an additional 0.4 million of its common shares for $6.6 million at an average price per share of $17.46.

Investments

3 Months Ended

Apr. 29, 2017

Schedule of Investments [Abstract]

Investments

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



	April 29, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
U.S. government and agency debt	$	201,084	$	92	$	(315	)	$	200,861
Foreign government and agency debt	9,255		—		(21		)	9,234
Municipal debt securities	24,510		6		(15		)	24,501
Corporate debt securities	439,586		603		(448		)	439,741
Equity securities	65,809		—		(1,381		)	64,428
Asset backed securities	34,679		28		(23		)	34,684
Held-to-maturity:
Time deposits	150,000		—		—			150,000
Total short-term investments	924,923		729		(2,203		)	923,449
Long-term investments:
Available-for-sale:
Auction rate securities	4,615		—		—			4,615
Total long-term investments	4,615		—		—			4,615
Total investments	$	929,538	$	729	$	(2,203	)	$	928,064



	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
Long-term investments	4,615		—		—			4,615
Total investments	$	859,684	$	404	$	(1,205	)	$	858,883

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



	Three Months Ended
	April 29, 2017			April 30, 2016
Gross realized gains	$	69		$	388
Gross realized losses	(44		)	(224		)
Total net realized gains (losses)	$	25		$	164

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



	April 29, 2017				January 28, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	445,416	$	445,401	$	423,151	$	423,058
Due between one and five years	411,498		411,439		423,669		422,995
Due over five years	6,815		6,796		12,864		12,830
	$	863,729	$	863,636	$	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):



	April 29, 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	$	119,024	$	(315	)	$	—	$	—		$	119,024	$	(315	)
Foreign government and agency debt	9,234		(21		)	—		—			9,234		(21		)
Municipal debt securities	17,607		(14		)	1,249		(1		)	18,856		(15		)
Corporate debt securities	146,393		(447		)	829		(1		)	147,222		(448		)
Equity securities	64,428		(1,381		)	—		—			64,428		(1,381		)
Asset backed securities	11,864		(23		)	—		—			11,864		(23		)
Total securities	$	368,550	$	(2,201	)	$	2,078	$	(2	)	$	370,628	$	(2,203	)


	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	)

As of April 29, 2017, for fixed income securities that were in unrealized loss positions, the Company has determined that (i) it does not have the intent to sell these investments, and (ii) it is not more likely than not that it will be required to sell any of these investments before recovery of the amortized cost basis. In addition, as of April 29, 2017, the Company anticipates that it will recover the amortized cost basis of such fixed income securities and has determined that no other-than-temporary impairments associated with credit losses were required to be recognized during the three months ended April 29, 2017.

The Company has evaluated its equity securities as of April 29, 2017 and has determined that there were no other-than-temporary impairments in such securities with unrealized loss positions. This determination was based on several factors, which include the length of time and extent to which fair value has been less than the cost basis, the financial condition and near-term prospects of the issuer, and the Company’s intent and ability to hold the equity securities for a period of time sufficient to allow for any anticipated recovery in market value.

Derivative Financial Instruments

3 Months Ended

Apr. 29, 2017

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.

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



	Buy Contracts
	April 29, 2017		January 28, 2017
Israeli shekel	$	41,930	$	63,523

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 the Company’s derivative financial instruments (in thousands):



		Amount of Gains (Losses) in Statement of Operations
		Three Months Ended
	Location of Gains (Losses) in Statement of Operations	April 29, 2017		April 30, 2016
Derivatives designated as cash flow hedges:
Forward contracts:	Research and development	$	475	$	186
	Selling, general and administrative	63		26
		$	538	$	212

The portion of gains (losses) excluded from the assessment of hedge effectiveness are included in interest and other income, net, and these amounts were not material in the three months ended April 29, 2017 and April 30, 2016. The Company also reports hedge ineffectiveness from derivative financial instruments in current earnings which is not material in the three months ended April 29, 2017 and April 30, 2016. No cash flow hedges were terminated as a result of forecasted transactions that did not occur.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41620-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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-Paragraph 1
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 30
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Paragraph 1A
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624181-113959

Reference 17: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41638-113959

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Paragraph 1
-Subparagraph (SX 210.4-08.(n))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Fair Value Measurements

3 Months Ended

Apr. 29, 2017

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, equity securities, and U.S. government and agency debt securities, which are valued primarily using quoted market prices in active markets for identical assets. The Company’s Level 2 assets include its marketable investments in time deposits, foreign government and agency debt, municipal debt securities, corporate 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 April 29, 2017
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	7,142	$	—	$	—	$	7,142
Time deposits	—		25,500		—		25,500
U.S. government and agency debt	24,493		—		—		24,493
Municipal debt securities	—		8,740		—		8,740
Corporate debt securities	—		59,517		—		59,517
Short-term investments:
Time deposits	—		150,000		—		150,000
U.S. government and agency debt	200,861		—		—		200,861
Foreign government and agency debt	—		9,234		—		9,234
Municipal debt securities	—		24,501		—		24,501
Corporate debt securities	—		439,741		—		439,741
Equity securities	64,428		—		—		64,428
Asset backed securities	—		34,684		—		34,684
Prepaid expenses and other current assets:
Foreign currency forward contracts	—		2,376		—		2,376
Long-term investments:
Auction rate securities	—		—		4,615		4,615
Other non-current assets:
Severance pay fund	—		791		—		791
Total assets	$	296,924	$	755,084	$	4,615	$	1,056,623



	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
Corporate debt securities	—		31,280		—		31,280
Municipal debt securities	—		8,740		—		8,740
Short-term investments:
Time deposits	—		150,000		—		150,000
U.S. government and agency debt	185,387		—		—		185,387
Corporate debt securities	—		432,108		—		432,108
Foreign government and agency debt	—		13,375		—		13,375
Municipal debt securities	—		27,871		—		27,871
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 value for Level 3 assets (in thousands):



	Three Months Ended
	April 29, 2017		April 30, 2016
Beginning balance	$	4,615	$	11,296
Sales and redemptions	—		(2,322		)
Ending balance	$	4,615	$	8,974

- 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

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Apr. 29, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies 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 April 29, 2017, these foundries had incurred approximately $188.1 million of manufacturing costs and expenses relating to the Company’s outstanding purchase orders. Intellectual Property Indemnification The Company has agreed to indemnify certain customers for claims made against the Company’s products where such claims allege infringement of third-party intellectual property rights, including, but not limited to, patents, registered trademarks and/or copyrights. Under the aforementioned indemnification clauses, the Company may be obligated to defend the customer and pay for the damages awarded against the customer under an infringement claim, as well as the customer's attorneys’ fees and costs. The Company’s indemnification obligations generally do not expire after termination or expiration of the agreement containing the indemnification obligation. Generally, there are limits on and exceptions to the Company’s potential liability for indemnification. Although historically the Company has not made significant payments under these indemnification obligations, the Company cannot estimate the amount of potential future payments, if any, that it might be required to make as a result of these agreements. The maximum potential amount of any future payments that the Company could be required to make under these indemnification obligations could be significant. Contingencies and Legal Proceedings The Company and certain of its subsidiaries are currently parties to various legal proceedings, including those noted in this section. The legal proceedings and claims described below could result in substantial costs and could divert the attention and resources of the Company’s management. The Company is also engaged in other legal proceedings and claims not described below, which arise in the ordinary course of its business. The Company is currently unable to predict the final outcome of these lawsuits 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 would 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. A Case Management Conference was held on June 1, 2017. Trial is set for March 5, 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 that 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 the loss is both estimable and probable.

Income Tax	3 Months Ended
Income Tax	Apr. 29, 2017
Income Tax Disclosure [Abstract]
Income Tax	Income Tax The income tax provision for the three months ended April 29, 2017 included the current income tax expense of $3.6 million, a net increase in unrecognized tax benefits of $1.0 million, and an expense of $0.7 million related to other discrete items recorded in the quarter. The net increase in unrecognized tax benefits arose from penalties and interest of $0.7 million accrued on the outstanding unrecognized tax benefit balance, plus the accrual of $0.6 million for changes in prior year tax positions, partially offset by the release of $0.3 million due to expiration of the statute of limitations in a non-U.S. jurisdiction. The income tax benefit for the three months ended April 30, 2016 included the current income tax benefit of $3.1 million, a deferred tax benefit of $2.5 million for the portion of a payment to the Company’s former Chief Executive Officer that became deductible after his departure from the Company in April 2016, offset by a net increase in unrecognized tax benefits of $0.2 million. The net increase in unrecognized tax benefits arose from penalties and interest of $0.7 million accrued on the outstanding unrecognized tax benefit balance, partially offset by the release of $0.5 million due to expiration of the statute of limitations in a non-U.S. jurisdiction. It is reasonably possible that the amount of unrecognized tax benefits could increase or decrease significantly due to changes in tax law in various jurisdictions, new tax audits and changes in the U.S. dollar as compared to foreign currencies within the next 12 months. Excluding these factors, uncertain tax positions may decrease by as much as $9.8 million from the lapse of statutes of limitation in various jurisdictions during the next twelve months. Government tax authorities from several non-U.S. jurisdictions are also examining the Company’s tax returns. The Company believes that it has adequately provided for any reasonably foreseeable outcomes related to its tax audits and that any settlement will not have a material effect on its results at this time. The Company operates under tax incentives in certain countries that may be extended if certain additional requirements are satisfied. The tax incentives are conditional upon meeting certain employment and investment thresholds. The impact of these tax incentives decreased foreign taxes by $0.7 million and $0.9 million for the three months ended April 29, 2017 and April 30, 2016, respectively. The benefit of the tax incentives on net income per share was less than $0.01 per share for the three months ended April 29, 2017 and April 30, 2016. The Company’s principal source of liquidity as of April 29, 2017 consisted of approximately $1.6 billion of cash, cash equivalents and short-term investments, of which approximately $990 million was held by foreign subsidiaries (outside Bermuda). Approximately $600 million of this amount held by foreign subsidiaries is related to undistributed earnings that have been indefinitely reinvested outside of Bermuda. These funds are primarily held in China, Israel and the United States. The Company plans to use such amounts to fund various activities outside of Bermuda, including working capital requirements, capital expenditures for expansion, funding of future acquisitions or other financing activities. If such funds were needed by the parent company in Bermuda or if the amounts were otherwise no longer considered indefinitely reinvested, the Company would incur a tax expense of approximately $180 million.

Net Income (Loss) Per Share

3 Months Ended

Apr. 29, 2017

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):



	Three Months Ended
	April 29, 2017		April 30, 2016
Numerator:
Income (loss) from continuing operations	$	96,970	$	(13,271	)
Income (loss) from discontinued operations	9,651		(9,408		)
Net income (loss)	$	106,621	$	(22,679	)
Denominator:
Weighted average shares — basic	503,790		508,794
Effect of dilutive securities:
Share-based awards	13,802		—
Weighted average shares — diluted	517,592		508,794
Income (loss) from continuing operations per share:
Basic	$	0.19	$	(0.03	)
Diluted	$	0.19	$	(0.03	)
Income (loss) from discontinued operations per share:
Basic	$	0.02	$	(0.02	)
Diluted	$	0.02	$	(0.02	)
Net income (loss) per share:
Basic	$	0.21	$	(0.04	)
Diluted	$	0.21	$	(0.04	)

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):



	Three Months Ended
	April 29, 2017	April 30, 2016
Weighted average shares outstanding:
Share-based awards	9,166	42,955

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. Anti-dilutive potential shares from share-based awards are also excluded from the calculation of diluted earnings per share for the three months ended April 30, 2016 due to the net loss reported in that period.

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Apr. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [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 2017 had a 52-week year. Fiscal 2018 is a 53-week year.
Accounting Pronouncements Recently Adopted and Accounting Pronouncements Not Yet Effective	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 is effective for annual and interim reporting periods beginning after December 15, 2016. Adoption of this guidance 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 is 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 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 is 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 plans to adopt the standard on a modified retrospective basis, with the cumulative effect recognized at adoption. This plan of adoption is a change in the method that the Company had previously disclosed and is a result of the continued assessment and evaluation of the impacts of implementation on the Company. The Company’s initial assessment has identified a change in revenue recognition timing on our component sales made to distributors. The Company expects to recognize revenue when the Company delivers to the distributor rather than deferring recognition until the distributor sells the components. Other changes may be identified as the Company continues completion of the assessment and implementation planning phases. On the date of initial adoption, the Company will remove the deferred net revenue on component sales made to distributors through a cumulative adjustment to retained earnings. The Company expects the revenue and corresponding cost of goods sold deferral to be offset by the acceleration of revenue recognition as control of the product transfers to the Company's customer. To date, the Company has completed the assessment phase of its revenue project and is currently in the implementation, planning, design and development phase, identifying systems and process changes necessary to enable compliance with the new standard. As a result of further analysis of the requirements of the new standard, the Company has decided to apply the amendments on a modified retrospective basis, although it may decide to change at a later date. The Company will continue to monitor relevant elements and finalize its evaluation of any changes to its accounting policies and disclosures. 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 Company is currently evaluating the impact of this accounting standard update on its 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 probable 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 the Company's 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. Early adoption is permitted, including adoption in an interim period. The Company does not expect the adoption of this guidance to have a material effect on its 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. Early adoption is permitted, including adoption in an interim period. The Company does not expect the adoption of this guidance to have a material effect on its 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 is evaluating the effect this new guidance will have 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. Early adoption is permitted. The guidance is required to be applied prospectively to an award modified on or after the adoption date. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.

Discontinued Operations (Tables)

3 Months Ended

Apr. 29, 2017

Discontinued Operations and Disposal Groups [Abstract]

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



	April 29, 2017		January 28, 2017
Assets held for sale:
Inventory	$	13,498	$	8,154
Property and equipment, net	1,193		2,898
Goodwill	20,775		26,532
Acquired intangible assets, net	—		3,799
Other	1,490		1,490
Assets held for sale for discontinued operations	36,956		42,873
Other assets held for sale	2,752		2,973
Total assets of the disposal group classified as held for sale	$	39,708	$	45,846

Liabilities held for sale:
Deferred income	$	746	$	1,670



	Three Months Ended
	April 29, 2017		April 30, 2016
Net revenue	$	32,555	$	21,439
Operating costs and expenses:
Cost of goods sold	16,757		14,856
Research and development	12,065		13,917
Selling, general and administrative	1,624		1,672
Operating costs and expenses	30,446		30,445
Income (loss) from discontinued operations before income taxes	2,109		(9,006		)
Gain from sale of a business	8,155		—
Provision for income taxes	613		402
Income (loss) from discontinued operations, net of tax	$	9,651	$	(9,408	)

- 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

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-Name Accounting Standards Codification
-Topic 205
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-URI http://asc.fasb.org/extlink&oid=64862545&loc=SL51724579-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

Restructuring Related Charges (Tables)

3 Months Ended

Apr. 29, 2017

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve by Type of Cost

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



	Three Months Ended
	April 29, 2017			April 30, 2016
Restructuring related charges:
Severance and related costs	$	2,827		$	—
Facilities and related costs	(399		)	3,631
Other exit-related costs	380			—
	2,808			3,631
Release of reserves:
Severance	(717		)	(86		)
Other exit-related	(70		)	—
	(787		)	(86		)
Impairment and write-off of assets:
Technology license	174			—
Equipment and other	(690		)	896
	(516		)	896

Restructuring related charges	$	1,505		$	4,441

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 28, 2017	$	17,000		$	1,763		$	4,625		$	—	$	711		$	—	$	24,099
Restructuring charges	2,827			(578		)	380			—		179			—		2,808
Net cash payments	(3,042		)	(368		)	(56		)	—		(504		)	—		(3,970		)
Release of reserves	(717		)	(70		)	—			—		—			—		(787		)
Balance at April 29, 2017	$	16,068		$	747		$	4,949		$	—	$	386		$	—	$	22,150

Supplemental Financial Information (Tables)

3 Months Ended

Apr. 29, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Inventories



	April 29, 2017		January 28, 2017
Inventories:
Work-in-process	$	119,035	$	110,083
Finished goods	59,110		61,886
Total inventories	$	178,145	$	171,969

Schedule of Property, Plant and Equipment, Net



	April 29, 2017			January 28, 2017
Property and equipment, net:
Machinery and equipment	$	522,366		$	578,248
Buildings and building improvements	194,389			194,290
Computer software	93,533			99,186
Land	53,373			53,373
Leasehold improvements	47,852			49,004
Furniture and fixtures	23,530			23,903
Construction in progress	11,169			11,240
	946,212			1,009,244
Less: Accumulated depreciation and amortization	(706,854		)	(765,847		)
Total property and equipment, net	$	239,358		$	243,397

Schedule of Accrued Liabilities

Current accrued liabilities are comprised of the following at April 29, 2017 and January 28, 2017, respectively:



	April 29, 2017		January 28, 2017
Accrued liabilities:
Unsettled investment trades	$	40,299	$	15,371
Restructuring liability	21,827		23,150
Accrued royalties	16,802		17,349
Technology license obligations	15,508		21,905
Accrued rebates	14,149		26,095
Accrued legal expense	7,155		5,127
Other	38,575		34,494
Total accrued liabilities	$	154,315	$	143,491

Schedule of Deferred Income



	April 29, 2017			January 28, 2017
Deferred income:
Deferred revenue	$	99,498		$	93,148
Deferred cost of goods sold	(25,434		)	(25,024		)
Deferred income	$	74,064		$	68,124

Schedule of Other Non-current Liabilities



	April 29, 2017		January 28, 2017
Other non-current liabilities:
Deferred tax liabilities	$	50,850	$	38,777
Technology license obligations	13,612		14,949
Long-term accrued employee compensation	5,427		4,075
Other	1,522		6,136
Other non-current liabilities	$	71,411	$	63,937

Changes in Accumulated Other Comprehensive Income (Loss) by Components

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



	Unrealized Gain (Loss) on Marketable Securities			Unrealized Gain (Loss) on Auction Rate Securities		Unrealized Gain (Loss) on Cash Flow Hedges			Net Change in Pension Liability			Total
Balance at January 28, 2017	$	(801	)	$	—	$	824		$	—		$	23
Other comprehensive income (loss) before reclassifications	(714		)	—		1,838			(1,272		)	(148		)
Amounts reclassified from accumulated other comprehensive income (loss)	41			—		(80		)	—			(39		)
Other comprehensive income (loss)	(673		)	—		1,758			(1,272		)	(187		)
Balance at April 29, 2017	$	(1,474	)	$	—	$	2,582		$	(1,272	)	$	(164	)



	Unrealized Gain (Loss) on Marketable Securities			Unrealized Gain (Loss) on Auction Rate Securities		Unrealized Gain (Loss) on Cash Flow Hedges			Total
Balance at January 30, 2016	$	(656	)	$	—	$	(139	)	$	(795	)
Other comprehensive income before reclassifications	2,317			—		527			2,844
Amounts reclassified from accumulated other comprehensive income	116			—		57			173
Other comprehensive income	2,433			—		584			3,017
Balance at April 30, 2016	$	1,777		$	—	$	445		$	2,222

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) by Components

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



	Three Months Ended
Affected Line Item in the Statements of Operations:	April 29, 2017			April 30, 2016
Interest and other income, net:
Available-for-sale securities:
Marketable securities	$	(41	)	$	(116	)
Operating costs and expenses:
Cash flow hedges:
Research and development	71			(51		)
Selling, general and administrative	9			(6		)
Total	$	39		$	(173	)

Schedule of Interest and Other Income, Net



	Three Months Ended
	April 29, 2017			April 30, 2016
Interest and other income, net:
Interest income	$	3,512		$	3,442
Net realized gain on investments	25			164
Currency translation loss	(90		)	(1,941		)
Other expense	(63		)	(59		)
Interest expense	(51		)	(118		)
	$	3,333		$	1,488

Investments (Tables)

3 Months Ended

Apr. 29, 2017

Schedule of Investments [Abstract]

Summary of Investments

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



	April 29, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
U.S. government and agency debt	$	201,084	$	92	$	(315	)	$	200,861
Foreign government and agency debt	9,255		—		(21		)	9,234
Municipal debt securities	24,510		6		(15		)	24,501
Corporate debt securities	439,586		603		(448		)	439,741
Equity securities	65,809		—		(1,381		)	64,428
Asset backed securities	34,679		28		(23		)	34,684
Held-to-maturity:
Time deposits	150,000		—		—			150,000
Total short-term investments	924,923		729		(2,203		)	923,449
Long-term investments:
Available-for-sale:
Auction rate securities	4,615		—		—			4,615
Total long-term investments	4,615		—		—			4,615
Total investments	$	929,538	$	729	$	(2,203	)	$	928,064



	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
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 tables (in thousands):



	Three Months Ended
	April 29, 2017			April 30, 2016
Gross realized gains	$	69		$	388
Gross realized losses	(44		)	(224		)
Total net realized gains (losses)	$	25		$	164

Available-for-sale Securities Classified by Contractual Maturities

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



	April 29, 2017				January 28, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	445,416	$	445,401	$	423,151	$	423,058
Due between one and five years	411,498		411,439		423,669		422,995
Due over five years	6,815		6,796		12,864		12,830
	$	863,729	$	863,636	$	859,684	$	858,883

Unrealized Loss Position Investments



	April 29, 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	$	119,024	$	(315	)	$	—	$	—		$	119,024	$	(315	)
Foreign government and agency debt	9,234		(21		)	—		—			9,234		(21		)
Municipal debt securities	17,607		(14		)	1,249		(1		)	18,856		(15		)
Corporate debt securities	146,393		(447		)	829		(1		)	147,222		(448		)
Equity securities	64,428		(1,381		)	—		—			64,428		(1,381		)
Asset backed securities	11,864		(23		)	—		—			11,864		(23		)
Total securities	$	368,550	$	(2,201	)	$	2,078	$	(2	)	$	370,628	$	(2,203	)


	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)

3 Months Ended

Apr. 29, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments

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



	Buy Contracts
	April 29, 2017		January 28, 2017
Israeli shekel	$	41,930	$	63,523

Information about Gains (Losses) Associated with Derivative Financial Instruments

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



		Amount of Gains (Losses) in Statement of Operations
		Three Months Ended
	Location of Gains (Losses) in Statement of Operations	April 29, 2017		April 30, 2016
Derivatives designated as cash flow hedges:
Forward contracts:	Research and development	$	475	$	186
	Selling, general and administrative	63		26
		$	538	$	212

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41641-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41638-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579240-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41620-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Fair Value Measurements (Tables)

3 Months Ended

Apr. 29, 2017

Fair Value Disclosures [Abstract]

Fair Value, Assets and Liabilities Measured on Recurring Basis



	Fair Value Measurements at April 29, 2017
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	7,142	$	—	$	—	$	7,142
Time deposits	—		25,500		—		25,500
U.S. government and agency debt	24,493		—		—		24,493
Municipal debt securities	—		8,740		—		8,740
Corporate debt securities	—		59,517		—		59,517
Short-term investments:
Time deposits	—		150,000		—		150,000
U.S. government and agency debt	200,861		—		—		200,861
Foreign government and agency debt	—		9,234		—		9,234
Municipal debt securities	—		24,501		—		24,501
Corporate debt securities	—		439,741		—		439,741
Equity securities	64,428		—		—		64,428
Asset backed securities	—		34,684		—		34,684
Prepaid expenses and other current assets:
Foreign currency forward contracts	—		2,376		—		2,376
Long-term investments:
Auction rate securities	—		—		4,615		4,615
Other non-current assets:
Severance pay fund	—		791		—		791
Total assets	$	296,924	$	755,084	$	4,615	$	1,056,623



	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
Corporate debt securities	—		31,280		—		31,280
Municipal debt securities	—		8,740		—		8,740
Short-term investments:
Time deposits	—		150,000		—		150,000
U.S. government and agency debt	185,387		—		—		185,387
Corporate debt securities	—		432,108		—		432,108
Foreign government and agency debt	—		13,375		—		13,375
Municipal debt securities	—		27,871		—		27,871
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 value for Level 3 assets (in thousands):



	Three Months Ended
	April 29, 2017		April 30, 2016
Beginning balance	$	4,615	$	11,296
Sales and redemptions	—		(2,322		)
Ending balance	$	4,615	$	8,974

Net Income (Loss) Per Share (Tables)

3 Months Ended

Apr. 29, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

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



	Three Months Ended
	April 29, 2017		April 30, 2016
Numerator:
Income (loss) from continuing operations	$	96,970	$	(13,271	)
Income (loss) from discontinued operations	9,651		(9,408		)
Net income (loss)	$	106,621	$	(22,679	)
Denominator:
Weighted average shares — basic	503,790		508,794
Effect of dilutive securities:
Share-based awards	13,802		—
Weighted average shares — diluted	517,592		508,794
Income (loss) from continuing operations per share:
Basic	$	0.19	$	(0.03	)
Diluted	$	0.19	$	(0.03	)
Income (loss) from discontinued operations per share:
Basic	$	0.02	$	(0.02	)
Diluted	$	0.02	$	(0.02	)
Net income (loss) per share:
Basic	$	0.21	$	(0.04	)
Diluted	$	0.21	$	(0.04	)

Schedule of Anti-dilutive Potential Shares

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



	Three Months Ended
	April 29, 2017	April 30, 2016
Weighted average shares outstanding:
Share-based awards	9,166	42,955

Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue accruals	$ 579,180	$ 519,383
Income (loss) from continuing operations	96,970	$ (13,271)
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 (loss) from continuing operations	$ 7,900
Earnings per share from continuing operations (in usd per share)	$ 0.02

Recent Accounting Pronouncements (Details) $ in Millions	Jan. 28, 2017 USD ($)
Accounting Standards Update 2016-09 \| Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	$ 2

Discontinued Operations - Additional Information (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 04, 2017 USD ($) business	Jun. 05, 2017 USD ($)	Apr. 29, 2017 USD ($)	Apr. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business			$ 22,954	$ 0
Share-based compensation			24,017	24,453
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain on sale of business			8,155	0
Share-based compensation			1,700	2,300
Tax expense attributable to discontinued operations			613	$ 402
Discontinued Operations, Disposed of by Sale \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 45,000
Discontinued Operations, Disposed of by Sale \| Broadband Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business			$ 23,000
Discontinued Operations, Disposed of by Sale \| Broadband Business \| MaxLinear, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses to be disposed of \| business	1
Proceeds from sale of business	$ 23,000
Pre-tax gain on sale of business	$ 8,200

Discontinued Operations - Current Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Assets held for sale:
Other assets held for sale	$ 2,752	$ 2,973
Total assets of the disposal group classified as held for sale	39,708	45,846
Discontinued Operations, Disposed of by Sale
Assets held for sale:
Inventory	13,498	8,154
Property and equipment, net	1,193	2,898
Goodwill	20,775	26,532
Acquired intangible assets, net	0	3,799
Other	1,490	1,490
Assets held for sale for discontinued operations	36,956	42,873
Liabilities held for sale:
Deferred income	$ 746	$ 1,670

Discontinued Operations - Components of Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Operating costs and expenses:
Income (loss) from discontinued operations, net of tax	$ 9,651	$ (9,408)
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue	32,555	21,439
Operating costs and expenses:
Cost of goods sold	16,757	14,856
Research and development	12,065	13,917
Selling, general and administrative	1,624	1,672
Operating costs and expenses	30,446	30,445
Income (loss) from discontinued operations before income taxes	2,109	(9,006)
Gain from sale of a business	8,155	0
Provision for income taxes	613	402
Income (loss) from discontinued operations, net of tax	$ 9,651	$ (9,408)

Restructuring Related Charges - Additional Information (Details) $ in Thousands	3 Months Ended
	Apr. 29, 2017 USD ($) employee	Apr. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	$ 1,505	$ 4,441
Restructuring charges	2,808	3,631
Release of reserves	787	86
Severance and Related Costs
Restructuring Cost and Reserve [Line Items]
Release of reserves	$ 717	86
Number of positions eliminated \| employee	80
November 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	$ 1,500
Release of reserves	800
Gain on disposal of equipment	700
November 2016 Restructuring \| Severance Benefits and Other Exit-related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,800
November 2016 Restructuring \| Impairment of Technology Licenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	200
November 2016 Restructuring \| Facilities and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(578)
Release of reserves	70
November 2016 Restructuring \| Severance and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,827
Release of reserves	$ 717
Research and Development Operations in Israel \| Facilities and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3,600
Mobile Platform Business
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 800

Restructuring Related Charges - Charges Related to Restructuring Actions (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Restructuring and Related Activities [Abstract]
Severance and related costs	$ 2,827	$ 0
Facilities and related costs	(399)	3,631
Other exit-related costs	380	0
Restructuring charges	2,808	3,631
Restructuring Cost and Reserve [Line Items]
Release of reserves	(787)	(86)
Impairment and write-off of assets:
Technology license	174	0
Equipment and other	(690)	896
Impairment and write-off of assets	(516)	896
Restructuring related charges	1,505	4,441
Severance
Restructuring Cost and Reserve [Line Items]
Release of reserves	(717)	(86)
Other exit-related
Restructuring Cost and Reserve [Line Items]
Release of reserves	$ (70)	$ 0

Restructuring Related Charges - Reconciliation of Beginning and Ending Restructuring Liability Balances by Major Type of Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Restructuring Reserve [Roll Forward]
Restructuring liabilities, beginning of balance	$ 24,099
Restructuring charges	2,808	$ 3,631
Net cash payments	(3,970)
Release of reserves	(787)	(86)
Restructuring liabilities, ending balance	22,150
Severance and Related Costs
Restructuring Reserve [Roll Forward]
Release of reserves	(717)	(86)
Other Exit-Related Costs
Restructuring Reserve [Roll Forward]
Release of reserves	(70)	$ 0
November 2016 Restructuring
Restructuring Reserve [Roll Forward]
Release of reserves	(800)
November 2016 Restructuring \| Severance and Related Costs
Restructuring Reserve [Roll Forward]
Restructuring liabilities, beginning of balance	17,000
Restructuring charges	2,827
Net cash payments	(3,042)
Release of reserves	(717)
Restructuring liabilities, ending balance	16,068
November 2016 Restructuring \| Facilities and Related Costs
Restructuring Reserve [Roll Forward]
Restructuring liabilities, beginning of balance	1,763
Restructuring charges	(578)
Net cash payments	(368)
Release of reserves	(70)
Restructuring liabilities, ending balance	747
November 2016 Restructuring \| Other Exit-Related Costs
Restructuring Reserve [Roll Forward]
Restructuring liabilities, beginning of balance	4,625
Restructuring charges	380
Net cash payments	(56)
Release of reserves	0
Restructuring liabilities, ending balance	4,949
Mobile & Other Prior Restructuring \| Severance and Related Costs
Restructuring Reserve [Roll Forward]
Restructuring liabilities, beginning of balance	0
Restructuring charges	0
Net cash payments	0
Release of reserves	0
Restructuring liabilities, ending balance	0
Mobile & Other Prior Restructuring \| Facilities and Related Costs
Restructuring Reserve [Roll Forward]
Restructuring liabilities, beginning of balance	711
Restructuring charges	179
Net cash payments	(504)
Release of reserves	0
Restructuring liabilities, ending balance	386
Mobile & Other Prior Restructuring \| Other Exit-Related Costs
Restructuring Reserve [Roll Forward]
Restructuring liabilities, beginning of balance	0
Restructuring charges	0
Net cash payments	0
Release of reserves	0
Restructuring liabilities, ending balance	$ 0

Supplemental Financial Information - Inventories (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Inventories:
Work-in-process	$ 119,035	$ 110,083
Finished goods	59,110	61,886
Total inventories	178,145	171,969
Third-party Logistics Providers
Inventories:
Total inventories	$ 27,100	$ 26,500

Supplemental Financial Information - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 946,212	$ 1,009,244
Less: Accumulated depreciation and amortization	(706,854)	(765,847)
Total property and equipment, net	239,358	243,397
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	522,366	578,248
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	194,389	194,290
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	93,533	99,186
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	53,373	53,373
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	47,852	49,004
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23,530	23,903
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 11,169	$ 11,240

Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Accrued liabilities:
Unsettled investment trades	$ 40,299	$ 15,371
Restructuring liability	21,827	23,150
Accrued royalties	16,802	17,349
Technology license obligations	15,508	21,905
Accrued rebates	14,149	26,095
Accrued legal expense	7,155	5,127
Other	38,575	34,494
Total accrued liabilities	$ 154,315	$ 143,491

Supplemental Financial Information - Deferred Income (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Deferred income:
Deferred revenue	$ 99,498	$ 93,148
Deferred cost of goods sold	(25,434)	(25,024)
Deferred income	$ 74,064	$ 68,124

- 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	Apr. 29, 2017	Jan. 28, 2017
Other non-current liabilities:
Deferred tax liabilities	$ 50,850	$ 38,777
Technology license obligations	13,612	14,949
Long-term accrued employee compensation	5,427	4,075
Other	1,522	6,136
Other non-current liabilities	$ 71,411	$ 63,937

Supplemental Financial Information - Changes in Accumulated Other Comprehensive Income (Loss) by Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Increase (Decrease) in AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 4,027,651
Other comprehensive income (loss) before reclassifications	(148)	$ 2,844
Amounts reclassified from accumulated other comprehensive income (loss)	(39)	173
Other comprehensive income (loss), net of tax	(187)	3,017
Ending balance	3,961,846
Unrealized Gain (Loss) on Marketable Securities
Increase (Decrease) in AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(801)	(656)
Other comprehensive income (loss) before reclassifications	(714)	2,317
Amounts reclassified from accumulated other comprehensive income (loss)	41	116
Other comprehensive income (loss), net of tax	(673)	2,433
Ending balance	(1,474)	1,777
Unrealized Gain (Loss) on Auction Rate Securities
Increase (Decrease) in AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss), net of tax	0	0
Ending balance	0	0
Unrealized Gain (Loss) on Cash Flow Hedges
Increase (Decrease) in AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	824	(139)
Other comprehensive income (loss) before reclassifications	1,838	527
Amounts reclassified from accumulated other comprehensive income (loss)	(80)	57
Other comprehensive income (loss), net of tax	1,758	584
Ending balance	2,582	445
Net Change in Pension Liability
Increase (Decrease) in AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0
Other comprehensive income (loss) before reclassifications	(1,272)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Other comprehensive income (loss), net of tax	(1,272)
Ending balance	(1,272)
Total
Increase (Decrease) in AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	23	(795)
Ending balance	$ (164)	$ 2,222

Supplemental Financial Information - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) by Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other income, net	$ 3,333	$ 1,488
Research and development	(193,027)	(226,541)
Selling, general and administrative	(55,211)	(64,163)
Net income (loss)	106,621	(22,679)
Reclassification out of accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	39	(173)
Reclassification out of accumulated other comprehensive income (loss) \| Available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other income, net	(41)	(116)
Reclassification out of accumulated other comprehensive income (loss) \| Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Research and development	71	(51)
Selling, general and administrative	$ 9	$ (6)

Supplemental Financial Information - Interest and Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Interest and other income, net:
Interest income	$ 3,512	$ 3,442
Net realized gain on investments	25	164
Currency translation loss	(90)	(1,941)
Other expense	(63)	(59)
Interest expense	(51)	(118)
Interest and other income, net	$ 3,333	$ 1,488

- 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 - Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		81 Months Ended
	Jun. 05, 2017	Apr. 29, 2017	Apr. 30, 2016	Apr. 29, 2017
Subsequent Event [Line Items]
Number of shares repurchased		10,500,000	0	265,400,000
Amount of shares repurchased		$ 164.8		$ 3,400.0
Share repurchase program, remaining available for future share repurchases		$ 719.2		$ 719.2
Subsequent Event
Subsequent Event [Line Items]
Number of shares repurchased	400,000
Amount of shares repurchased	$ 6.6
Shares repurchased, average price per share (in usd per share)	$ 17.46

Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Available-for-sale:
Amortized Cost	$ 863,729	$ 859,684
Gross Unrealized Gains		404
Gross Unrealized Losses		(1,205)
Estimated Fair Value	863,636	858,883
Held-to-maturity:
Amortized Cost	929,538
Gross Unrealized Gains	729
Gross Unrealized Losses	(2,203)
Estimated Fair Value	928,064
Total short-term investments
Available-for-sale:
Amortized Cost		855,069
Gross Unrealized Gains		404
Gross Unrealized Losses		(1,205)
Estimated Fair Value		854,268
Held-to-maturity:
Amortized Cost	924,923
Gross Unrealized Gains	729
Gross Unrealized Losses	(2,203)
Estimated Fair Value	923,449
U.S. government and agency debt
Available-for-sale:
Amortized Cost	201,084	185,584
Gross Unrealized Gains	92	86
Gross Unrealized Losses	(315)	(283)
Estimated Fair Value	200,861	185,387
Foreign government and agency debt
Available-for-sale:
Amortized Cost	9,255	13,425
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(21)	(50)
Estimated Fair Value	9,234	13,375
Municipal debt securities
Available-for-sale:
Amortized Cost	24,510	27,916
Gross Unrealized Gains	6	4
Gross Unrealized Losses	(15)	(49)
Estimated Fair Value	24,501	27,871
Corporate debt securities
Available-for-sale:
Amortized Cost	439,586	432,603
Gross Unrealized Gains	603	281
Gross Unrealized Losses	(448)	(776)
Estimated Fair Value	439,741	432,108
Equity securities
Available-for-sale:
Amortized Cost	65,809
Gross Unrealized Gains	0
Gross Unrealized Losses	(1,381)
Estimated Fair Value	64,428
Asset backed securities
Available-for-sale:
Amortized Cost	34,679	45,541
Gross Unrealized Gains	28	33
Gross Unrealized Losses	(23)	(47)
Estimated Fair Value	34,684	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
Total long-term investments
Held-to-maturity:
Amortized Cost	4,615	4,615
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	4,615	4,615
Auction rate securities
Available-for-sale:
Amortized Cost	4,615	4,615
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 4,615	$ 4,615

Investments - Gross Realized Gains and Losses on Sales of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 69	$ 388
Gross realized losses	(44)	(224)
Total net realized gains (losses)	$ 25	$ 164

Investments - Contractual Maturities of Available for Sale Securities (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Amortized Cost
Due in one year or less	$ 445,416	$ 423,151
Due between one and five years	411,498	423,669
Due over five years	6,815	12,864
Amortized Cost	863,729	859,684
Estimated Fair Value
Due in one year or less	445,401	423,058
Due between one and five years	411,439	422,995
Due over five years	6,796	12,830
Estimated Fair Value	$ 863,636	$ 858,883

Investments - Summary of Investments Gross Unrealized Losses and Fair Value (Details) - USD ($)	3 Months Ended
	Apr. 29, 2017	Jan. 28, 2017
Fair Value
Less than 12 months	$ 368,550,000	$ 339,525,000
12 months or more	2,078,000	18,810,000
Total	370,628,000	358,335,000
Unrealized Loss
Less than 12 months	(2,201,000)	(1,176,000)
12 months or more	(2,000)	(29,000)
Total	(2,203,000)	(1,205,000)
Other-than-temporary impairments associated with credit losses	0
U.S. government and agency debt
Fair Value
Less than 12 months	119,024,000	94,064,000
12 months or more	0	0
Total	119,024,000	94,064,000
Unrealized Loss
Less than 12 months	(315,000)	(283,000)
12 months or more	0	0
Total	(315,000)	(283,000)
Foreign government and agency debt
Fair Value
Less than 12 months	9,234,000	11,875,000
12 months or more	0	1,499,000
Total	9,234,000	13,374,000
Unrealized Loss
Less than 12 months	(21,000)	(48,000)
12 months or more	0	(2,000)
Total	(21,000)	(50,000)
Municipal debt securities
Fair Value
Less than 12 months	17,607,000	17,450,000
12 months or more	1,249,000	1,248,000
Total	18,856,000	18,698,000
Unrealized Loss
Less than 12 months	(14,000)	(47,000)
12 months or more	(1,000)	(2,000)
Total	(15,000)	(49,000)
Corporate debt securities
Fair Value
Less than 12 months	146,393,000	199,382,000
12 months or more	829,000	16,063,000
Total	147,222,000	215,445,000
Unrealized Loss
Less than 12 months	(447,000)	(751,000)
12 months or more	(1,000)	(25,000)
Total	(448,000)	(776,000)
Equity securities
Fair Value
Less than 12 months	64,428,000
12 months or more	0
Total	64,428,000
Unrealized Loss
Less than 12 months	(1,381,000)
12 months or more	0
Total	(1,381,000)
Asset backed securities
Fair Value
Less than 12 months	11,864,000	16,754,000
12 months or more	0	0
Total	11,864,000	16,754,000
Unrealized Loss
Less than 12 months	(23,000)	(47,000)
12 months or more	0	0
Total	$ (23,000)	$ (47,000)

Derivative Financial Instruments - Notional Amounts of Outstanding Foreign Currency Forward Contracts (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Buy Contracts \| Israeli shekel
Derivative [Line Items]
Derivative, notional amount	$ 41,930	$ 63,523

Derivative Financial Instruments - Information about Gains (Losses) Associated with Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ 538	$ 212
Cash flow hedges \| Foreign currency forward contracts \| Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	475	186
Cash flow hedges \| Foreign currency forward contracts \| Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ 63	$ 26

Derivative Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Hedge ineffectiveness from derivative financial instruments	$ 0	$ 0
Cash flow hedges were terminated as a result of forecasted transactions that did not occur	$ 0

Fair Value Measurements - Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017
Assets
Investments	$ 928,064
Fair Value
Assets
Total assets	1,056,623	$ 1,022,493
Fair Value \| Other non-current assets \| Severance pay fund
Assets
Other non-current assets	791	736
Fair Value \| Foreign currency forward contracts
Liabilities
Accrued liabilities		58
Fair Value \| Foreign currency forward contracts \| Prepaid expenses and other current assets
Assets
Prepaid expenses and other current assets	2,376	735
Fair Value \| Money market funds
Assets
Cash equivalents	7,142	36,122
Fair Value \| Time deposits
Assets
Cash equivalents	25,500	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	24,493	17,497
Fair Value \| U.S. government and agency debt \| Short-term investments
Assets
Investments	200,861	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	9,234	13,375
Fair Value \| Municipal debt securities
Assets
Cash equivalents	8,740	8,740
Fair Value \| Municipal debt securities \| Short-term investments
Assets
Investments	24,501	27,871
Fair Value \| Corporate debt securities
Assets
Cash equivalents	59,517	31,280
Fair Value \| Corporate debt securities \| Short-term investments
Assets
Investments	439,741	432,108
Fair Value \| Equity securities \| Short-term investments
Assets
Investments	64,428
Fair Value \| Asset backed securities \| Short-term investments
Assets
Investments	34,684	45,527
Fair Value \| Auction rate securities \| Total long-term investments
Assets
Investments	4,615	4,615
Fair Value \| Level 1
Assets
Total assets	296,924	239,006
Fair Value \| Level 1 \| Other non-current assets \| Severance pay fund
Assets
Other non-current assets	0	0
Fair Value \| Level 1 \| Foreign currency forward contracts
Liabilities
Accrued liabilities		0
Fair Value \| Level 1 \| Foreign currency forward contracts \| Prepaid expenses and other current assets
Assets
Prepaid expenses and other current assets	0	0
Fair Value \| Level 1 \| Money market funds
Assets
Cash equivalents	7,142	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	24,493	17,497
Fair Value \| Level 1 \| U.S. government and agency debt \| Short-term investments
Assets
Investments	200,861	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 \| Equity securities \| Short-term investments
Assets
Investments	64,428
Fair Value \| Level 1 \| Asset backed securities \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 1 \| Auction rate securities \| Total long-term investments
Assets
Investments	0	0
Fair Value \| Level 2
Assets
Total assets	755,084	778,872
Fair Value \| Level 2 \| Other non-current assets \| Severance pay fund
Assets
Other non-current assets	791	736
Fair Value \| Level 2 \| Foreign currency forward contracts
Liabilities
Accrued liabilities		58
Fair Value \| Level 2 \| Foreign currency forward contracts \| Prepaid expenses and other current assets
Assets
Prepaid expenses and other current assets	2,376	735
Fair Value \| Level 2 \| Money market funds
Assets
Cash equivalents	0	0
Fair Value \| Level 2 \| Time deposits
Assets
Cash equivalents	25,500	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	9,234	13,375
Fair Value \| Level 2 \| Municipal debt securities
Assets
Cash equivalents	8,740	8,740
Fair Value \| Level 2 \| Municipal debt securities \| Short-term investments
Assets
Investments	24,501	27,871
Fair Value \| Level 2 \| Corporate debt securities
Assets
Cash equivalents	59,517	31,280
Fair Value \| Level 2 \| Corporate debt securities \| Short-term investments
Assets
Investments	439,741	432,108
Fair Value \| Level 2 \| Equity securities \| Short-term investments
Assets
Investments	0
Fair Value \| Level 2 \| Asset backed securities \| Short-term investments
Assets
Investments	34,684	45,527
Fair Value \| Level 2 \| Auction rate securities \| Total long-term investments
Assets
Investments	0	0
Fair Value \| Level 3
Assets
Total assets	4,615	4,615
Fair Value \| Level 3 \| Other non-current assets \| Severance pay fund
Assets
Other non-current assets	0	0
Fair Value \| Level 3 \| Foreign currency forward contracts
Liabilities
Accrued liabilities		0
Fair Value \| Level 3 \| Foreign currency forward contracts \| Prepaid expenses and other current assets
Assets
Prepaid expenses and other 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 \| Equity securities \| Short-term investments
Assets
Investments	0
Fair Value \| Level 3 \| Asset backed securities \| Short-term investments
Assets
Investments	0	0
Fair Value \| Level 3 \| Auction rate securities \| Total long-term investments
Assets
Investments	$ 4,615	$ 4,615

Fair Value Measurements - Change in Fair Values for Level 3 Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 4,615	$ 11,296
Sales and redemptions	0	(2,322)
Ending balance	$ 4,615	$ 8,974

Commitments and Contingencies (Details) $ in Millions	Oct. 12, 2016	Sep. 11, 2015 claim	Apr. 29, 2017 USD ($)
Luna Litigation and Consolidated Cases
Other Commitments [Line Items]
Number of additional claims consolidated \| claim		2
Plaintiff's period to file an amended complaint	30 days
Manufacturing Costs and Expenses
Other Commitments [Line Items]
Outstanding purchase orders \| $			$ 188.1

Income Tax (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Income Tax Disclosure [Abstract]
Current income tax expense (benefit)	$ 3.6	$ 3.1
Net increase in unrecognized tax benefits	1.0	0.2
Expense related to other discrete items	0.7
Unrecognized tax benefit, interest and penalties accrued	0.7	0.7
Unrecognized tax benefit, changes in prior year tax positions	0.6
Unrecognized tax benefit, release due to expiration of statute of limitations in non-U.S. jurisdictions	0.3	0.5
Deferred tax benefit		2.5
Uncertain tax positions, decrease from the lapse of statutes of limitation in various jurisdictions during next 12 months	9.8
Tax incentives, decrease in foreign taxes	$ 0.7	$ 0.9
Tax incentives, effect on net income per share (less than) (in usd per share)	$ 0.01	$ 0.01
Income Taxes [Line Items]
Cash, cash equivalents and short-term investments	$ 1,600.0
Undistributed earnings of foreign subsidiaries	600.0
Foreign Subsidiaries
Income Taxes [Line Items]
Cash, cash equivalents and short-term investments	990.0
Increase (decrease) in tax expense in the event of undistributed earnings needed by parent company or no longer considered indefinitely reinvested outside of Bermuda	$ 180.0

Net Income (Loss) Per Share - Computations of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Numerator:
Income (loss) from continuing operations	$ 96,970	$ (13,271)
Income (loss) from discontinued operations	9,651	(9,408)
Net income (loss)	$ 106,621	$ (22,679)
Denominator:
Weighted average shares — basic	503,790	508,794
Effect of dilutive securities:
Share-based awards	13,802	0
Weighted average shares — diluted	517,592	508,794
Income (loss) from continuing operations per share:
Basic (in usd per share)	$ 0.19	$ (0.03)
Diluted (in usd per share)	0.19	(0.03)
Income (loss) from discontinued operations per share:
Basic (in usd per share)	0.02	(0.02)
Diluted (in usd per share)	0.02	(0.02)
Net income (loss) per share:
Net income (loss) per share - basic (in usd per share)	0.21	(0.04)
Net income (loss) per share - diluted (in usd per share)	$ 0.21	$ (0.04)

Net Income (Loss) Per Share - Anti-dilutive Potential Shares (Details) - shares shares in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Weighted average shares outstanding:
Share-based awards	9,166	42,955