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Document and Entity Information - shares shares in Millions	3 Months Ended
Document and Entity Information - shares shares in Millions	Apr. 30, 2016	Jul. 29, 2016
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2016
Document Fiscal Year Focus	2017
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 Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		511.2

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Current assets:
Cash and cash equivalents	$ 780,222	$ 1,278,180
Short-term investments	835,018	1,004,569
Accounts receivable, net	280,658	323,300
Inventories	196,739	210,017
Prepaid expenses and other current assets	57,139	102,560
Total current assets	2,149,776	2,918,626
Property and equipment, net	283,584	299,540
Long-term investments	8,974	11,296
Goodwill	2,029,945	2,029,945
Acquired intangible assets, net	15,064	18,010
Other non-current assets	169,778	164,710
Total assets	4,657,121	5,442,127
Current liabilities:
Accounts payable	193,697	180,372
Accrued liabilities	107,731	132,060
Carnegie Mellon University accrued litigation settlement		736,000
Accrued employee compensation	128,783	121,631
Deferred income	54,488	55,722
Total current liabilities	484,699	1,225,785
Non-current income taxes payable	50,046	49,256
Other non-current liabilities	22,558	26,963
Total liabilities	557,303	1,302,004
Commitments and contingencies (Note 10)
Shareholders' equity:
Common shares, $0.002 par value	1,022	1,015
Additional paid-in capital	3,038,732	3,028,921
Accumulated other comprehensive income (loss)	2,222	(795)
Retained earnings	1,057,842	1,110,982
Total shareholders' equity	4,099,818	4,140,123
Total liabilities and shareholders' equity	$ 4,657,121	$ 5,442,127

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Apr. 30, 2016	Jan. 30, 2016
Common shares, par value	$ 0.002	$ 0.002

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Net revenue	$ 540,822	$ 724,288
Operating costs and expenses:
Cost of goods sold	259,210	351,153
Research and development	240,458	280,114
Selling and marketing	31,379	36,174
General and administrative	31,995	40,435
Restructuring and other related charges	4,441	592
Amortization of acquired intangible assets	2,461	2,568
Total operating costs and expenses	569,944	711,036
Operating income (loss)	(29,122)	13,252
Interest and other income, net	1,488	5,167
Income (loss) before income taxes	(27,634)	18,419
Provision (benefit) for income taxes	(4,955)	4,329
Net income (loss)	$ (22,679)	$ 14,090
Net income (loss) per share:
Basic	$ (0.04)	$ 0.03
Diluted	$ (0.04)	$ 0.03
Weighted average shares:
Basic	508,794	516,228
Diluted	508,794	527,167
Cash dividend declared per share	$ 0.06	$ 0.06

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Net income (loss)	$ (22,679)	$ 14,090
Other comprehensive income (loss), net of tax:
Net change in unrealized gain/loss on marketable securities	2,433	(1,860)
Net change in unrealized gain/loss on auction rate securities		(115)
Net change in unrealized gain/loss on cash flow hedges	584	1,747
Other comprehensive income (loss), net of tax	3,017	(228)
Comprehensive income (loss), net of tax	$ (19,662)	$ 13,862

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Cash flows from operating activities:
Net income (loss)	$ (22,679)	$ 14,090
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	21,788	26,620
Share-based compensation	24,453	33,221
Amortization of acquired intangible assets	2,946	3,053
Non-cash restructuring and other related charges	896	573
Other non-cash expense (income), net	1,361	(561)
Excess tax benefits from share-based compensation		(18)
Changes in assets and liabilities:
Accounts receivable	42,642	27,141
Inventories	13,598	(31,318)
Prepaid expenses and other assets	38,056	1,969
Accounts payable	19,922	17,125
Accrued liabilities and other non-current liabilities	(22,502)	(11,576)
Carnegie Mellon University accrued litigation settlement	(736,000)
Accrued employee compensation	7,152	(14,424)
Deferred income	(1,234)	(7,027)
Net cash provided by (used in) operating activities	(609,601)	58,868
Cash flows from investing activities:
Purchases of available-for-sale securities	(93,365)	(392,900)
Sales of available-for-sale securities	218,522	152,568
Maturities of available-for-sale securities	97,788	94,927
Purchases of time deposits	(50,000)
Purchases of technology licenses	(4,050)	(3,606)
Purchases of property and equipment	(6,542)	(7,334)
Purchase of equipment previously leased		(10,240)
Net cash provided by (used in) investing activities	162,353	(166,585)
Cash flows from financing activities:
Repurchase of common stock		(20,273)
Proceeds from employee stock plans	315	13,013
Minimum tax withholding paid on behalf of employees for net share settlement	(15,270)	(22,310)
Dividend payments to shareholders	(30,461)	(30,910)
Payments on technology license obligations	(5,294)	(4,067)
Excess tax benefits from share-based compensation		18
Net cash used in financing activities	(50,710)	(64,529)
Net decrease in cash and cash equivalents	(497,958)	(172,246)
Cash and cash equivalents at beginning of period	1,278,180	1,210,977
Cash and cash equivalents at end of period	$ 780,222	$ 1,038,731

The Company and Basis of Presentation

3 Months Ended

Apr. 30, 2016

The Company and Basis of Presentation

Note 1. The Company and Basis of Presentation

The Company

Marvell Technology Group Ltd., a Bermuda company, and its subsidiaries (the “Company”), is a fabless semiconductor provider of high-performance application-specific standard products. The Company’s core strength of expertise is the development of complex System-on-a-Chip and System-in-a-Package devices, leveraging its extensive technology portfolio of intellectual property in the areas of analog, mixed-signal, digital signal processing, and embedded and stand alone integrated circuits. The majority of the Company’s product portfolio leverages embedded central processing unit technology. The Company also develops platforms that it defines as integrated hardware along with software that incorporates digital computing technologies designed and configured to provide an optimized computing solution. The Company’s broad product portfolio includes devices for data storage, enterprise-class Ethernet data switching, Ethernet physical-layer transceivers, wireless connectivity, Internet-of-Things devices and multimedia solutions.

Basis of Presentation

The Company’s fiscal year is the 52- or 53-week period ending on the Saturday closest to January 31. In a 52-week year, each fiscal quarter consists of 13 weeks. The additional week in a 53-week year is added to the fourth quarter, making such quarter consist of 14 weeks. Fiscal 2017 and 2016 each has a 52-week period.

The unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for annual financial statements. In the opinion of management, all adjustments consisting of normal and recurring entries considered necessary for a fair statement of the results for the interim periods have been included in the Company’s unaudited condensed consolidated balance sheet as of April 30, 2016, the results of its operations for the three months ended April 30, 2016 and May 2, 2015, its comprehensive income (loss) for the three months ended April 30, 2016 and May 2, 2015, and its cash flows for the three months ended April 30, 2016 and May 2, 2015. The January 30, 2016 condensed consolidated balance sheet data was derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 30, 2016, but does not include all disclosures required for annual periods.

These condensed consolidated financial statements and related notes are unaudited and should be read in conjunction with the Company’s audited financial statements and related notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 30, 2016 as filed on July 21, 2016 with the Securities and Exchange Commission. The results of operations for the three months ended April 30, 2016 are not necessarily indicative of the results that may be expected for any other interim period or for the full fiscal year.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to performance-based compensation, revenue recognition, provisions for sales returns and allowances, inventory excess and obsolescence, investment fair values, goodwill and other intangible assets, restructuring, income taxes, litigation and other contingencies. In addition, the Company uses assumptions when employing the Monte Carlo simulation and Black-Scholes valuation models to calculate the fair value of share-based awards that are granted. Actual results could differ from these estimates, and such differences could affect the results of operations reported in future periods.

Principles of Consolidation

The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated. The functional currency of the Company and its subsidiaries is the U.S. dollar.

Recent Accounting Pronouncements

3 Months Ended

Apr. 30, 2016

Recent Accounting Pronouncements

Note 2. Recent Accounting Pronouncements

Accounting Pronouncements Recently Adopted

In April 2015, the Financial Accounting Standards Board issued new guidance to help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement, which was effective for the Company beginning in the first quarter of fiscal 2017. The guidance provides a basis for evaluating whether a cloud computing arrangement includes a software license and whether the license arrangement should be accounted for as an intangible asset. This guidance also strikes from previous authoritative guidance, the use by analogy to the accounting for capital leases, which the Company applied in the accounting for certain of its technology license agreements. As such, the Company will account for any new agreements on a prospective basis in accordance with the new guidance and will re-evaluate the accounting for any renewals to existing license agreements. There was no significant impact from this change in accounting policy in the three months ended April 30, 2016.

- Definition

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

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=66092750

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794

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

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

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

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

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794

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

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305

+ Details

Investments

3 Months Ended

Apr. 30, 2016

Investments

Note 3. Investments

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


	April 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	475,447	$	2,032	$	(349	)	$	477,130
U.S. government and agency debt		213,256		88		(96	)		213,248
Asset backed securities		50,341		115		(17	)		50,439
Time deposits		50,000		—		—			50,000
Foreign government and agency debt		15,504		4		(8	)		15,500
Municipal debt securities		28,693		17		(9	)		28,701

Total short-term investments		833,241		2,256		(479	)		835,018
Long-term investments:
Available-for-sale:
Auction rate securities		8,974		—		—			8,974

Total long-term investments		8,974		—		—			8,974

Total investments	$	842,215	$	2,256	$	(479	)	$	843,992


	January 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	558,337	$	766	$	(1,282	)	$	557,821
U.S. government and agency debt		317,595		64		(254	)		317,405
Asset backed securities		76,711		81		(56	)		76,736
Foreign government and agency debt		21,370		2		(14	)		21,358
Municipal debt securities		31,211		45		(7	)		31,249

Total short-term investments		1,005,224		958		(1,613	)		1,004,569
Long-term investments:
Available-for-sale:
Auction rate securities		11,296		—		—			11,296

Total long-term investments		11,296		—		—			11,296

Total investments	$	1,016,520	$	958	$	(1,613	)	$	1,015,865

As of April 30, 2016, the Company’s investment portfolio included auction rate securities with an aggregate par value of $10.0 million. Although these auction rate securities have continued to pay interest and the underlying collateral has not deteriorated, there is currently limited trading volume. The Company uses a discounted cash flow model to estimate the fair value of the auction rate securities based on its estimated timing and amount of future interest and principal payments. In developing the cash flow model, the Company considers the credit quality and liquidity of the underlying securities and related issuer, the collateralization of underlying security investments and other considerations.

The Company made a determination in January 2016 that it did not expect to recover the par value of these auction rate securities and considers any impairment of these securities to be other-than-temporary. There has been no change in circumstances since January 2016 based upon the current time horizon for holding these securities and the continuation of an illiquid market. Based on the Company’s assessment of fair value as of April 30, 2016, the Company determined there was no further impairment of these auction rate securities.

During the three months ended April 30, 2016, the Company sold auction rate securities, which had an aggregate par value of $2.5 million, for net proceeds of $2.4 million. The carrying value of these auction rate securities was previously written down to $2.3 million and, therefore, resulted in a gain of $0.1 million upon its sale.

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


	Three Months Ended
	April 30, 2016			May 2, 2015
Gross realized gains	$	388		$	443
Gross realized losses		(224	)		(107	)

Total net realized gains	$	164		$	336

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


	April 30, 2016				January 30, 2016
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	265,259	$	265,285	$	304,117	$	304,035
Due between one and five years		558,663		560,405		689,847		689,279
Due over five years		18,293		18,302		22,556		22,551

	$	842,215	$	843,992	$	1,016,520	$	1,015,865

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 30, 2016
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	116,376	$	(288	)	$	23,597	$	(61	)	$	139,973	$	(349	)
U.S. government and agency debt		110,771		(90	)		4,993		(6	)		115,764		(96	)
Asset backed securities		11,562		(17	)		—		—			11,562		(17	)
Foreign government and agency debt		8,847		(8	)		—		—			8,847		(8	)
Municipal debt securities		9,387		(8	)		499		(1	)		9,886		(9	)

Total securities	$	256,943	$	(411	)	$	29,089	$	(68	)	$	286,032	$	(479	)


	January 30, 2016
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	283,138	$	(1,237	)	$	14,383	$	(45	)	$	297,521	$	(1,282	)
U.S. government and agency debt		263,325		(254	)		—		—			263,325		(254	)
Asset backed securities		46,646		(56	)		—		—			46,646		(56	)
Foreign government and agency debt		16,458		(14	)		—		—			16,458		(14	)
Municipal debt securities		2,943		(5	)		1,571		(2	)		4,514		(7	)

Total securities	$	612,510	$	(1,566	)	$	15,954	$	(47	)	$	628,464	$	(1,613	)

Supplemental Financial Information

3 Months Ended

Apr. 30, 2016

Supplemental Financial Information

Note 4. Supplemental Financial Information (in thousands)

Consolidated Balance Sheets


	April 30, 2016		January 30, 2016
Inventories:
Work-in-process	$	128,183	$	131,471
Finished goods		68,556		78,546

Total inventories	$	196,739	$	210,017


	April 30, 2016			January 30, 2016
Property and equipment, net:
Machinery and equipment	$	580,885		$	578,627
Buildings		144,320			144,320
Computer software		99,272			102,928
Land		53,373			53,373
Building improvements		49,927			49,927
Leasehold improvements		50,838			50,192
Furniture and fixtures		25,658			27,119
Construction in progress		653			1,353

		1,004,926			1,007,839
Less: Accumulated depreciation and amortization		(721,342	)		(708,299	)

Total property and equipment, net	$	283,584		$	299,540


	April 30, 2016		January 30, 2016
Other non-current assets:
Technology and other licenses	$	46,078	$	48,770
Deferred tax assets		36,981		34,505
Investments in privately-held companies		5,804		5,804
Prepaid land use rights		13,045		13,123
Deposits		51,566		51,512
Other		16,304		10,996

Total other non-current assets	$	169,778	$	164,710


	April 30, 2016			January 30, 2016
Accrued liabilities:
Accrued rebates	$	20,346		$	41,320
Accrued royalties		15,823			16,217
Technology license obligations		19,580			17,985
Accrued legal expense		8,218			9,761
Accrued litigation		3,350			3,830
Other		40,414			42,947

Total accrued liabilities	$	107,731		$	132,060


	April 30, 2016			January 30, 2016
Deferred income:
Net deferred revenue	$	76,412		$	77,935
Deferred cost of goods sold		(21,924	)		(22,213	)

Deferred income	$	54,488		$	55,722


	April 30, 2016			January 30, 2016
Other non-current liabilities:
Technology license obligations	$	8,508		$	12,461
Long-term accrued employee compensation		6,350			6,078
Other		7,700			8,424

Other non-current liabilities	$	22,558		$	26,963

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			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 loss		116			—		57			173

Other comprehensive income		2,433			—		584			3,017

Balance at April 30, 2016	$	1,777		$	—	$	445		$	2,222


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

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

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

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 Statement of Operations	April 30, 2016			May 2, 2015
Interest and other income, net:
Available-for-sale securities:
Marketable securities	$	(116	)	$	332
Cash flow hedges:
Research and development		(51	)		(864	)
Selling and marketing		(1	)		(67	)
General and administrative		(5	)		(13	)

Total	$	(173	)	$	(612	)

Consolidated Statement of Operations


	Three Months Ended
	April 30, 2016			May 2, 2015
Interest and other income, net:
Interest income	$	3,442		$	4,077
Net realized gain on investments		164			336
Foreign currency exchange gain (loss)		(1,941	)		407
Other income (loss)		(59	)		567
Interest expense		(118	)		(220	)

	$	1,488		$	5,167

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 30, 2016			May 2, 2015
Numerator:
Net income (loss)	$	(22,679	)	$	14,090

Denominator:
Weighted average shares — basic		508,794			516,228
Effect of dilutive securities:
Share-based awards		—			10,939

Weighted average shares — diluted		508,794			527,167

Net income (loss) per share:
Basic	$	(0.04	)	$	0.03
Diluted	$	(0.04	)	$	0.03

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 30, 2016		May 2, 2015
Weighted average shares outstanding:
Share-based awards		42,955		58,387

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 reported net loss.

Derivative Financial Instruments

3 Months Ended

Apr. 30, 2016

Derivative Financial Instruments

Note 5. Derivative Financial Instruments

The Company manages some of its foreign currency exchange rate risk through the purchase of foreign currency exchange contracts that hedge against the short-term effect of currency fluctuations. The Company’s policy is to enter into foreign currency forward contracts with maturities less than 12 months that mitigate the effect of rate fluctuations on certain local currency denominated operating expenses. All derivative instruments are recorded at fair value in either prepaid expenses and other current assets or accrued liabilities. The Company reports cash flows from derivative instruments in cash flows from operating activities. The Company uses quoted prices to value its derivative instruments.

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


	Buy Contracts
	April 30, 2016		January 31, 2016
Israeli shekel	$	11,301	$	19,082

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

Other Foreign Currency Forward Contracts. The Company enters into foreign currency forward exchange contracts to hedge certain assets and liabilities denominated in various foreign currencies that it does not designate as hedges for accounting purposes. The maturities of these contracts are generally less than 12 months. Gains or losses arising from the remeasurement of these contracts to fair value each period are recorded in interest and other income, net.

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

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


		Amount of Gains (Losses) in Statement of Operations for the three months ended
	Location of Gains (Losses) in Statement of Operations	April 30, 2016		May 2, 2015
Derivatives designated as cash flow hedges:
Forward contracts:	Research and development	$	186	$	(991	)
	Selling and marketing		4		(77	)
	General and administrative		22		(14	)

		$	212	$	(1,082	)

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 30, 2016 and May 2, 2015. In addition, realized losses from forward contracts that are not designated as hedging instruments that are included in interest and other income, net, were not material in the three months ended April 30, 2016 and May 2, 2015. The Company also reports hedge ineffectiveness from derivative financial instruments in current earnings, which was not material in the three months ended April 30, 2016 and May 2, 2015. 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

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+ Details

Fair Value Measurements

3 Months Ended

Apr. 30, 2016

Fair Value Measurements

Note 6. Fair Value Measurements

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

Level 1—Observable inputs that reflect quoted prices for identical assets or liabilities in active markets.

Level 2—Other inputs that are directly or indirectly observable in the marketplace.

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

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

The Company’s Level 1 assets include institutional money-market funds that are classified as cash equivalents and marketable investments in U.S. government and agency debt, which are valued primarily using quoted market prices. The Company’s Level 2 assets include its marketable investments in time deposits, corporate debt securities, foreign government and agency debt, municipal debt securities and asset backed securities as the market inputs to value these instruments consist of market yields, reported trades and broker/dealer quotes, which are corroborated with observable market data. In addition, foreign currency forward contracts, and the severance pay fund are classified 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. 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 total amount of assets measured using Level 3 valuation methodologies represented 0.2% of total assets as of April 30, 2016.

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


	Fair Value Measurements at April 30, 2016
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	12,398	$	—	$	—	$	12,398
Time deposits		—		136,733		—		136,733
U.S. government and agency debt		10,200		—		—		10,200
Corporate debt securities		—		5,796		—		5,796
Municipal debt securities		—		2,590		—		2,590
Short-term investments:
U.S. government and agency debt		213,248		—		—		213,248
Corporate debt securities		—		477,130		—		477,130
Asset backed securities		—		50,439		—		50,439
Time deposits		—		50,000		—		50,000
Foreign government and agency debt		—		15,500		—		15,500
Municipal debt securities		—		28,701		—		28,701
Prepaid expenses and other current assets:
Foreign currency forward contracts		—		404		—		404
Long-term investments:
Auction rate securities		—		—		8,974		8,974
Other non-current assets:
Severance pay fund		—		735		—		735

Total assets	$	235,846	$	768,028	$	8,974	$	1,012,848


	Fair Value Measurements at January 30, 2016
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	160,400	$	—	$	—	$	160,400
Time deposits		—		209,405		—		209,405
U.S. government and agency debt		184,374		—		—		184,374
Corporate debt securities		—		54,689		—		54,689
Short-term investments:
U.S. government and agency debt		317,405		—		—		317,405
Corporate debt securities		—		557,821		—		557,821
Asset backed securities		—		76,736		—		76,736
Foreign government and agency debt		—		21,358		—		21,358
Municipal debt securities		—		31,249		—		31,249
Prepaid expenses and other current assets:
Foreign currency forward contracts		—		30		—		30
Long-term investments:
Auction rate securities		—		—		11,296		11,296
Other non-current assets:
Severance pay fund		—		678		—		678

Total assets	$	662,179	$	951,966	$	11,296	$	1,625,441

Liabilities
Accrued liabilities:
Foreign currency forward contracts	$	—	$	195	$	—	$	195

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


	Three Months Ended
	April 30, 2016			May 2, 2015
Beginning balance	$	11,296		$	10,226
Sales and redemptions		(2,322	)		—
Unrealized losses included in accumulated other comprehensive income		—			(115	)

Ending balance	$	8,974		$	10,111

- Definition

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

+ References + Details

Acquired Intangible Assets, Net

3 Months Ended

Apr. 30, 2016

Acquired Intangible Assets, Net

Note 7. Acquired Intangible Assets, Net

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


			April 30, 2016							January 30, 2016
	Range of Useful Lives		Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amount		Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amounts
Purchased and core technology		4 - 8 years	$	35,498	$	(23,463	)	$	12,035	$	35,498	$	(21,910	)	$	13,588
Customer intangibles		5 - 7 years		28,600		(25,571	)		3,029		28,600		(24,178	)		4,422

Total intangible assets, net			$	64,098	$	(49,034	)	$	15,064	$	64,098	$	(46,088	)	$	18,010

Based on the identified intangible assets recorded at April 30, 2016, the future amortization expense of identified intangible assets for the next five fiscal years is as follows (in thousands):


Fiscal Year
Remainder of fiscal 2017	$	7,696
2018		5,508
2019		1,860
2020 and thereafter		—

	$	15,064

Restructuring and Other Related Charges

3 Months Ended

Apr. 30, 2016

Restructuring and Other Related Charges

Note 8. Restructuring and Other Related Charges

The following table provides detail of restructuring and other related charges as presented in the unaudited condensed consolidated statements of operations related to the restructuring actions described below (in thousands):


	Three Months Ended
	April 30, 2016			May 2, 2015
Facilities and related costs	$	3,631		$	19
Release of reserves:
Severance		(86	)		—

		3,545			19
Impairment loss and write-off of assets:
Equipment		896			573

Restructuring and other related charges	$	4,441		$	592

The Company recorded a total $4.4 million in the three months ended April 30, 2016, respectively, in connection with restructuring and other related charges as described in the following paragraphs:

In connection with the Company’s decision to further reduce its research and development operations in Israel announced in May 2015, the Company and the landlord of its facility located in Israel reached agreement for the Company to completely vacate and release certain floors back to the landlord for purposes of future sublease. As a result, the Company recorded a $3.6 million charge for the remaining lease obligation, net of estimated sublease income, associated with those 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. Of the remaining actions that were expected to be completed in the first half of fiscal 2017 related to restructuring of the mobile platform business, substantially all of the activities were completed by the end of April 2016. Total cumulative charges recorded in fiscal 2016 through the three months ended April 30, 2016 related to this restructuring action were $45.3 million, which included $28.1 million of severance benefits, a $1.6 million loss on early contract termination, $7.6 million for impairment of technology licenses and certain equipment, and a $8.0 million write down of inventory.

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


	Severance and Related Costs			Facilities and Related Costs			Other Exit-Related Costs			Total
Balance at January 30, 2016	$	1,155		$	1,043		$	1,644		$	3,842
Restructuring charges		—			3,631			—			3,631
Net cash payments		(825	)		(839	)		(200	)		(1,864	)
Release of reserves		(86	)		—			—			(86	)
Exchange rate adjustment		8			95			—			103

Balance at April 30, 2016	$	252		$	3,930		$	1,444		$	5,626

The balance at April 30, 2016 for facilities and related costs includes remaining payments under lease obligations related to vacated space that are expected to be paid through fiscal 2019.

Income Tax

3 Months Ended

Apr. 30, 2016

Income Tax

Note 9. Income Tax

The income tax benefit for the three months ended April 30, 2016 included the current income tax benefit of $2.7 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.

The income tax provision for the three months ended May 2, 2015 included the current income tax liability of $4.3 million, plus an additional provision of $3.1 million related to a $15.4 million payment to the Company’s former Chief Executive Officer, which were offset by a net reduction in unrecognized tax benefits of $3.1 million. The net reduction in unrecognized tax benefits arose from the release of $4.0 million due to the expiration of the statute of limitations in a non-U.S. jurisdiction, which was partially offset by penalties and interest of $0.9 million accrued on the outstanding unrecognized tax benefit balance.

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 $16.3 million from the lapse of statutes of limitation in various jurisdictions during the next 12 months. Government tax authorities from several non-U.S. jurisdictions are also examining 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, which may be extended if certain additional requirements are satisfied. The tax incentives are conditional upon meeting certain employment and investment thresholds. The impact of these tax incentives decreased foreign taxes by $0.9 million and $3.3 million in the three months ended April 30, 2016 and May 2, 2015, 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 30, 2016 and $0.01 per share for the three months ended May 2, 2015.

The Company’s principal source of liquidity as of April 30, 2016 consisted of approximately $1.6 billion of cash, cash equivalents and short-term investments, of which approximately $760 million was held by foreign subsidiaries (outside Bermuda). Approximately $570 million of this amount held by foreign subsidiaries is related to undistributed earnings, which have been indefinitely reinvested outside of Bermuda. These funds are primarily held in China, Israel, the United States and Switzerland. The Company plans to use such amounts to fund various activities outside of Bermuda including working capital requirements, capital expenditures for expansion, funding of future acquisitions, or other financing activities. If such funds were needed by the parent company in Bermuda or if the amounts were otherwise no longer considered indefinitely reinvested, the Company would incur a tax expense of approximately $175 million.

Commitments and Contingencies

3 Months Ended

Apr. 30, 2016

Commitments and Contingencies

Note 10. Commitments and Contingencies

Purchase Commitments

Under the Company’s manufacturing relationships with its foundry partners, cancellation of all outstanding purchase orders are allowed but require payment of all costs and expenses incurred through the date of cancellation. As of April 30, 2016, these foundries had incurred approximately $168.5 million of manufacturing costs and expenses relating to the Company’s outstanding purchase orders.

Intellectual Property Indemnification

The Company has agreed to indemnify certain customers for claims made against the Company’s products, where such claims allege infringement of third-party intellectual property rights, including, but not limited to, patents, registered trademarks, and/or copyrights. Under the aforementioned indemnification clauses, the Company may be obligated to defend the customer and pay for the damages awarded against the customer under an infringement claim as well as the customer’s attorneys’ fees and costs. The Company’s indemnification obligations generally do not expire after termination or expiration of the agreement containing the indemnification obligation. Generally, there are limits on and exceptions to the Company’s potential liability for indemnification. Although historically the Company has not made significant payments under these indemnification obligations, the Company cannot estimate the amount of potential future payments, if any, that it might be required to make as a result of these agreements. The maximum potential amount of any future payments that the Company could be required to make under these indemnification obligations could be significant.

Contingencies

The Company and certain of its subsidiaries are currently parties to various legal proceedings, including those noted in this section. The legal proceedings and claims described below could result in substantial costs and could divert the attention and resources of the Company’s management. The Company is also engaged in other legal proceedings and claims not described below, which arise in the ordinary course of its business. Litigation is subject to inherent uncertainties and unfavorable rulings could occur. An unfavorable ruling in litigation could require the Company to pay damages, one-time license fees or ongoing royalty payments, and could prevent the Company from manufacturing or selling some of its products or limit or restrict the type of work that employees involved in such litigation may perform for the Company, any of which could adversely affect financial results in future periods. The Company believes that its products do not infringe valid and enforceable claims and it will continue to vigorously defend against the allegations in these matters. However, there can be no assurance that these matters will be resolved in a manner that is not adverse to the Company’s business, financial condition, results of operations or cash flows.

As of April 30, 2016, the Company has an accrued litigation balance of $3.4 million related to certain legal proceedings in the section described below. Unless otherwise stated, the Company is currently unable to predict the final outcome of these lawsuits and therefore cannot determine the likelihood of loss nor estimate a range of possible loss.

Carnegie Mellon University Litigation. On March 6, 2009, CMU filed a complaint in the U.S. District Court for the Western District of Pennsylvania (“W.D. of Pennsylvania”). CMU has asserted U.S. Patent Nos. 6,201,839 and 6,438,180 (collectively, the “CMU patents in suit”), which relate to read-channel integrated circuit devices and the hard disk drive (“HDD”) incorporating such devices. A jury trial began on November 26, 2012. On December 26, 2012, a jury delivered a verdict that found the CMU patents in suit were literally and willfully infringed and valid, and awarded past damages in the amount of $1.17 billion. Based on post-trial motions and decisions, the W.D. of Pennsylvania calculated the damages including enhancement to total approximately $1.54 billion, and held that, under its decision, CMU is entitled to post judgment interest and an ongoing royalty. On May 7, 2014, the W.D. of Pennsylvania entered final judgment, from which the Company filed a notice of appeal on May 14, 2014. On August 4, 2015, the W.D. of Pennsylvania in a three-judge panel issued an opinion affirming in part, reversing in part, and vacating and remanding in part. On February 16, 2016, the Company and CMU entered into a Settlement Agreement and Patent License pursuant to which the Company has agreed to pay an aggregate of $750 million, without any ongoing royalty payments, to CMU and the parties have agreed to mutually acceptable release, license and covenant not to sue provisions. Please see “Note 13 – Carnegie Mellon University Settlement” for additional information on the effect of the settlement. The Company expects the action to be finally dismissed in the third quarter of fiscal 2017, approximately 6 months after payment of the full amount of the settlement payment. In connection with the settlement, the primary supersedeas bond that the Company entered into in connection with this litigation was reduced to $439 million and the secondary bond, which is secured, was adjusted to $311 million. All of the Company’s obligations under both bonds were discharged pursuant to an order releasing supersedeas bonds on April 21, 2016. Any bond specific indemnity agreement will be terminated and released upon final dismissal of the action.

USEI Litigation. On October 9, 2009, U.S. Ethernet Innovations, LLC (“USEI”) filed a complaint in the U.S. District Court for the Eastern District of Texas (“E.D. of Texas”), in which USEI accused a number of system manufacturers, including the Company’s customers, of patent infringement (the “USEI litigation”). Specifically, USEI asserted that these customers infringe U.S. Patent Nos. 5,307,459, 5,434,872, 5,732,094 and 5,299,313, which relate to Ethernet technologies. The complaint seeks unspecified damages and an injunction.

On May 4, 2010, Marvell Semiconductor, Inc. (“MSI”) filed a motion to intervene in the USEI litigation, which was granted on May 19, 2010. On July 13, 2010, the E.D. of Texas issued an order granting the defendants’ motion to transfer the action to the U.S. District Court for the Northern District of California (“N.D. of California”); the case was formally transferred on August 23, 2010. On September 14, 2011, USEI withdrew its allegations against MSI for the ‘459 patent. On August 16, 2013, the N.D. of California granted defendants’ summary judgment motion to preclude the plaintiff from recovering certain pre-suit damages. On November 7, 2014, on summary judgment, the N.D. of California found that all the patents-in-suit were either invalid or not infringed. On December 1, 2014, the N.D. of California entered a judgment in favor of defendants and awarded defendants’ costs. On December 29, 2014, USEI filed a motion to alter or amend the N.D. of California’s summary judgment order, which the N.D. of California denied on March 31, 2015. On April 24, 2015, USEI filed its notice of appeal. On April 25, 2016, the Federal Circuit affirmed the N.D. of California’s judgment in favor of MSI. On June 29, 2016, the Federal Circuit denied USEI’s petition for rehearing.

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

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.

Saratoga Litigation. On October 16, 2015, Saratoga Advantage Trust Technology & Communications Portfolio (“Saratoga”) filed an action asserting shareholder derivative claims ostensibly on behalf of the Company in the Superior Court of the State of California, County of Santa Clara. The complaint names eight current or former officers and/or directors (Sehat Sutardja, Weili Dai, Juergen Gromer, Arturo Krueger, John Kassakian, Randhir Thakur, Michael Rashkin, and Sukhi Nagesh) as defendants and asserts various California state law causes of action based on allegations that the Company and the named officers and directors made, caused to be made, or failed to correct false and/or misleading statements in the Company’s press releases and public filings, leading to the filing of securities class actions that allegedly damaged the Company. The Company was named as a nominal defendant. The complaint requests damages and restitution in unspecified amounts, equitable and/or injunctive relief, costs and fees of bringing the action, and other unspecified relief.

On October 23, 2015, the Company removed the action to the N.D. of California. On December 21, 2015, the N.D. of California denied Saratoga’s motion to remand. On December 21, 2015, the N.D. of California granted the Company’s motion to deem the action related to the consolidated Luna actions, discussed above. On January 22, 2016, the Company filed a motion to dismiss the complaint; on March 25, 2016, the N.D. of California held a hearing on the motion and took the matter under submission. To the Company’s knowledge, none of the individual defendants has yet been served.

Surety Bonds

On May 14, 2014, the Company filed a Notice of Appeal to appeal the final judgment issued by the W.D. of Pennsylvania in the CMU litigation. In order to stay the execution of the final judgment pending its appeal, the Company filed a supersedeas bond for $1.54 billion with the W.D. of Pennsylvania in the event the Company did not fully satisfy a final judgment as affirmed after the completion of all appellate proceedings. The bond was issued by a consortium of sureties authorized by the U.S. Treasury. In support of the bond, the Company entered into separate indemnity agreements with each of the sureties to indemnify the sureties from all costs and payments made under the bond. The indemnity agreements did not require collateral to be posted at the time of the issuance of the bond. However, the indemnity agreements provide that each of the sureties have the right to demand to be placed in funds or call for collateral under pre-defined events.

On November 14, 2014, the Company filed a second surety bond for $216 million and filed a commitment letter from the sureties to issue up to an additional $95 million in bonding under certain conditions. The second bond and commitment are secured by the Company’s campus located in Santa Clara, California, which has a carrying value of $131.4 million at April 30, 2016.

In connection with the settlement that was reached with CMU for a total $750 million in February 2016, the primary supersedeas bond that the Company entered into was reduced to $439 million and the secondary bond was adjusted to $311 million and both were discharged pursuant to an order releasing supersedeas bonds on April 21, 2016. The underlying indemnity agreements will terminate upon the final dismissal of the case which the Company expects will occur in the third quarter of fiscal 2017. For additional information, see CMU litigation under “Contingencies” above.

Indemnities, Commitments and Guarantees

During its normal course of business, the Company has made certain indemnities, commitments and guarantees under which it may be required to make payments in relation to certain transactions. These indemnities may include intellectual property indemnities to the Company’s customers in connection with the sales of its products, indemnities for liabilities associated with the infringement of other parties’ technology based upon the Company’s products, indemnities for general commercial obligations, indemnities to various lessors in connection with facility leases for certain claims arising from such facility or lease, and indemnities to directors and officers of the Company to the maximum extent permitted under the laws of Bermuda. In addition, the Company has contractual commitments to various customers, which could require the Company to incur costs to repair an epidemic defect with respect to its products outside of the normal warranty period if such defect were to occur. The duration of these indemnities, commitments and guarantees varies, and in certain cases, is indefinite. Some of these indemnities, commitments and guarantees do not provide for any limitation of the maximum potential future payments that the Company could be obligated to make. In general, the Company does not record any liability for these indemnities, commitments and guarantees in the accompanying consolidated balance sheets as the amounts cannot be reasonably estimated and are not considered probable. The Company does, however, accrue for losses for any known contingent liability, including those that may arise from indemnification provisions, when future payment is probable.

Shareholders' Equity

3 Months Ended

Apr. 30, 2016

Shareholders' Equity

Note 11. Shareholders’ Equity

Stock Plans

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


	Time-Based Options					Market-Based Options					Total
	Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price
Balance at January 30, 2016		40,874		$	13.59		2,156		$	15.43		43,030		$	13.68
Granted		1,881		$	9.78		—					1,881		$	9.78
Exercised		(45	)	$	7.00		—					(45	)	$	7.00
Canceled/Forfeited		(1,849	)	$	22.90		(2,156	)	$	15.43		(4,005	)	$	18.88

Balance at April 30, 2016		40,861		$	13.00		—					40,861		$	13.00

Vested or expected to vest at April 30, 2016		38,788		$	12.99

Exercisable at April 30, 2016		24,777		$	12.98

For time-based stock options vested and expected to vest at April 30, 2016, the aggregate intrinsic value was $10.9 million and the weighted average remaining contractual term was 5.8 years. For time-based stock options exercisable at April 30, 2016, the aggregate intrinsic value was $10.3 million and the weighted average remaining contractual term was 4.5 years. The aggregate intrinsic value of stock options exercised during the three months ended April 30, 2016 and May 2, 2015 was $0.1 million and $6.3 million, respectively. The market-based stock options automatically expired in April 2016 since the market price conditions were not met within the required five years from date of grant. The Company’s closing stock price of $9.98 as reported on the NASDAQ Global Select Market for all in-the-money options as of April 29, 2016 was used to calculate the aggregate intrinsic value.

As of April 30, 2016, the unamortized compensation expense for time-based stock options was $36.2 million and market-based stock options were fully amortized in fiscal 2014. The unamortized compensation expense for time-based stock options will be amortized on a straight-line basis and is expected to be recognized over a weighted average period of 2.1 years.

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


	Time-Based					Performance-Based					Market-Based					Total
	Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value
Balance at January 30, 2016		8,343		$	13.57		977		$	14.43		353		$	12.24		9,673		$	13.61
Granted		7,394		$	9.43		—					—					7,394		$	9.43
Vested		(4,946	)	$	14.16		(155	)	$	14.15		—					(5,101	)	$	14.16
Canceled/Forfeited		(218	)	$	12.85		(822	)	$	14.49		(299	)	$	12.24		(1,339	)	$	13.72

Balance at April 30, 2016		10,573		$	10.41		—					54		$	12.24		10,627		$	10.42

In connection with the performance-based equity awards granted in fiscal 2016 to each of the Company’s executive officers, a total of 33,616 shares vested on April 1, 2016 based on achieving certain individual strategic goals as evaluated by the Executive Compensation Committee of the Company’s Board of Directors. No shares vested for the achievement of financial performance goals since the financial performance criteria were below the threshold level. The amount of canceled shares reported in the table above includes the unvested shares that were not earned.

The Company recognizes expense from performance-based equity awards when it becomes probable that the performance conditions will be met. Once it becomes probable that a performance-based award will vest, the Company recognizes share-based compensation expense equal to the number of shares expected to vest multiplied by the fair value of the award at the grant date, which is amortized using the accelerated method.

The aggregate intrinsic value of restricted stock units expected to vest as of April 30, 2016 was $95.1 million. The number of restricted stock units that are expected to vest is 9.5 million shares. As of April 30, 2016, unamortized compensation expense related to restricted stock units was $93.6 million. The unamortized compensation expense for restricted stock units will be amortized on a straight-line basis and is expected to be recognized over a weighted average period of 1.8 years.

Employee Stock Purchase Plan

During the three months ended April 30, 2016 and May 2, 2015, the Company issued no shares under the 2000 Employee Stock Purchase Plan, as amended and restated (the “ESPP”). As of April 30, 2016, there was $38.4 million of unrecognized compensation cost related to the ESPP.

Share Repurchase Program

There were no share repurchases during the three months ended April 30, 2016. The Company repurchased 1.4 million of its common shares for $22.1 million during the three months ended May 2, 2015. The repurchased shares were retired immediately after the repurchases were completed. The Company records all repurchases, as well as investment purchases and sales, based on trade date. As of April 30, 2016, a total of 241.6 million shares have been repurchased to date under the Company’s share repurchase program for a total $3.1 billion in cash and there was $182.6 million remaining available for future share repurchases. The Company has made no subsequent share repurchases since its third quarter of fiscal 2016.

Dividends

The Company paid the following cash dividends:


	Three Months Ended
	April 30, 2016		May 2, 2015
Cash dividend per share	$	0.06	$	0.06

Total payment to shareholders (in thousands)	$	30,461	$	30,910

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

On May 18, 2016, the Company announced that its board of directors declared a cash dividend of $0.06 per share paid on July 12, 2016 to shareholders of record as of June 14, 2016.

- Definition

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

+ References

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Share-Based Compensation

3 Months Ended

Apr. 30, 2016

Share-Based Compensation

Note 12. Share-Based Compensation

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


	Three Months Ended
	April 30, 2016			May 2, 2015
Cost of goods sold	$	1,802		$	1,547
Research and development		24,396			24,781
Selling and marketing		2,942			2,577
General and administrative		(4,687	)		4,316

	$	24,453		$	33,221

Upon the termination of certain members of our executive management in April 2016, it was determined that the vesting in certain of their unvested stock awards was not probable. As a result, the Company recorded a $6.9 million reversal of the previously recognized related share-based compensation expense in the first quarter of fiscal 2017. Share-based compensation capitalized in inventory was $1.8 million at April 30, 2016 and $1.5 million at January 30, 2016.

Valuation Assumptions

The following weighted average assumptions were used for each respective period to calculate the fair value of each time-based equity award on the date of grant using the Black-Scholes option pricing model:


	Three Months Ended
	April 30, 2016			May 2, 2015
Time-based Stock Options:
Weighted average fair value	$	2.87		$	4.54
Expected volatility		40	%		34	%
Expected term (in years)		5.2			5.4
Risk-free interest rate		1.3	%		1.5	%
Expected dividend yield		2.5	%		1.6	%

Under the ESPP, there were no stock purchase rights granted in the three months ended April 30, 2016 and May 2, 2015.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Carnegie Mellon University Settlement

3 Months Ended

Apr. 30, 2016

Carnegie Mellon University Settlement

Note 13. Carnegie Mellon University Settlement

In February 2016, the Company and CMU settled their patent infringement lawsuit pursuant to a court-ordered mediation and entered into a Settlement Agreement and Patent License (the “Agreement”). The parties agreed to mutual release of claims, license and covenant not to sue provisions for which the Company paid an aggregate of $750 million to CMU in the three months ended April 30, 2016. See CMU litigation under “Note 10 – Commitments and Contingencies” for further information about the lawsuit.

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

The $654.7 million for the mutual release of claims and covenant not to sue was recorded in fiscal 2016 as a settlement charge in operating expenses since there is no future benefit. The $81.3 million license fee was recorded in fiscal 2016 as a charge in cost of goods sold for past use of the license. The $14.0 million representing the future use of the license, is to be recognized in cost of goods sold over the remaining term of the license from February 2016 through April 2018. Accordingly, the Company recorded $1.6 million to cost of goods sold in the three months ended April 30, 2016.

The Company considered its existing cash, cash equivalents and short-term investments was sufficient to cover payment of the $750 million settlement, and in April 2016, the Company completed full payment of the $750 million to CMU.

Changes in the Company's Organization

3 Months Ended

Apr. 30, 2016

Changes in the Company's Organization

Note 14. Changes in the Company’s Organization

In April 2016, the employment of Dr. Sehat Sutardja as Chief Executive Officer and Weili Dai as President was terminated by the Company’s Board of Directors. Dr. Sutardja and Ms. Dai remain on the Board of Directors at this time. The Board of Directors then formed an Interim Office of the Chief Executive and appointed Maya Strelar-Migotti, Executive Vice President of the Smart Networked Devices and Solutions Business Group, and Dr. Pantelis Alexopoulos, Executive Vice President of the Storage Business Group, as Interim Co-Chief Executive Officers, each having the authority to exercise all powers of the Chief Executive Officer.

Also in April 2016, the Company announced that it entered into an agreement with Starboard Value LP (“Starboard”), regarding the composition of its Board of Directors. Under the terms of the agreement, the Company elected Peter A. Feld, Richard S. Hill, Oleg Khaykin, Michael Strachan and Robert Switz to serve on its board. The agreement specifies that the Board will recommend and the Company will support and solicit proxies only for the election at the 2016 annual general meeting of Messrs. Feld, Hill, Khaykin, Murphy, Strachan and Switz and the four independent directors serving on the Board immediately prior to the execution of the agreement, Dr. Juergen Gromer, Dr. John G. Kassakian, Arturo Krueger and Dr. Randhir Thakur.

In May 2016, Mr. Hill replaced Dr. Sutardja as the Chairman of the Board. In June 2016, the Board of Directors appointed Matthew J. Murphy to serve as the Company’s President and Chief Executive Officer, effective July 11, 2016. Ms. Strelar-Migotti and Dr. Alexopoulos returned to their roles as Executive Vice Presidents of the Company effective upon Mr. Murphy’s commencement of employment.

Upon the commencement of Mr. Murphy’s employment, the Board subsequently appointed Richard S. Hill, the Chairman of the Board, as the Company’s Interim Principal Executive Officer, to serve in that capacity until the Company files its Quarterly Report on Form 10-Q for the second quarter of fiscal 2017 (“Q217 Form 10-Q”). Mr. Murphy will assume the role of the Company’s principal executive officer immediately following the filing of the Q217 Form 10-Q. Mr. Murphy also joined the Board of Directors on July 11, 2016.

Accounting Policies (Policies)	3 Months Ended
Accounting Policies (Policies)	Apr. 30, 2016
Basis of Presentation	*Basis of Presentation* The Company’s fiscal year is the 52- or 53-week period ending on the Saturday closest to January 31. In a 52-week year, each fiscal quarter consists of 13 weeks. The additional week in a 53-week year is added to the fourth quarter, making such quarter consist of 14 weeks. Fiscal 2017 and 2016 each has a 52-week period. The unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for annual financial statements. In the opinion of management, all adjustments consisting of normal and recurring entries considered necessary for a fair statement of the results for the interim periods have been included in the Company’s unaudited condensed consolidated balance sheet as of April 30, 2016, the results of its operations for the three months ended April 30, 2016 and May 2, 2015, its comprehensive income (loss) for the three months ended April 30, 2016 and May 2, 2015, and its cash flows for the three months ended April 30, 2016 and May 2, 2015. The January 30, 2016 condensed consolidated balance sheet data was derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 30, 2016, but does not include all disclosures required for annual periods. These condensed consolidated financial statements and related notes are unaudited and should be read in conjunction with the Company’s audited financial statements and related notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 30, 2016 as filed on July 21, 2016 with the Securities and Exchange Commission. The results of operations for the three months ended April 30, 2016 are not necessarily indicative of the results that may be expected for any other interim period or for the full fiscal year.
Use of Estimates	*Use of Estimates* The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to performance-based compensation, revenue recognition, provisions for sales returns and allowances, inventory excess and obsolescence, investment fair values, goodwill and other intangible assets, restructuring, income taxes, litigation and other contingencies. In addition, the Company uses assumptions when employing the Monte Carlo simulation and Black-Scholes valuation models to calculate the fair value of share-based awards that are granted. Actual results could differ from these estimates, and such differences could affect the results of operations reported in future periods.
Principles of Consolidation	*Principles of Consolidation* The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated. The functional currency of the Company and its subsidiaries is the U.S. dollar.
Accounting Pronouncements Recently Adopted	*Accounting Pronouncements Recently Adopted* In April 2015, the Financial Accounting Standards Board issued new guidance to help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement, which was effective for the Company beginning in the first quarter of fiscal 2017. The guidance provides a basis for evaluating whether a cloud computing arrangement includes a software license and whether the license arrangement should be accounted for as an intangible asset. This guidance also strikes from previous authoritative guidance, the use by analogy to the accounting for capital leases, which the Company applied in the accounting for certain of its technology license agreements. As such, the Company will account for any new agreements on a prospective basis in accordance with the new guidance and will re-evaluate the accounting for any renewals to existing license agreements. There was no significant impact from this change in accounting policy in the three months ended April 30, 2016.

Investments (Tables)

3 Months Ended

Apr. 30, 2016

Schedule of Available-for-sale Securities Reconciliation

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


	April 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	475,447	$	2,032	$	(349	)	$	477,130
U.S. government and agency debt		213,256		88		(96	)		213,248
Asset backed securities		50,341		115		(17	)		50,439
Time deposits		50,000		—		—			50,000
Foreign government and agency debt		15,504		4		(8	)		15,500
Municipal debt securities		28,693		17		(9	)		28,701

Total short-term investments		833,241		2,256		(479	)		835,018
Long-term investments:
Available-for-sale:
Auction rate securities		8,974		—		—			8,974

Total long-term investments		8,974		—		—			8,974

Total investments	$	842,215	$	2,256	$	(479	)	$	843,992


	January 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Available-for-sale:
Corporate debt securities	$	558,337	$	766	$	(1,282	)	$	557,821
U.S. government and agency debt		317,595		64		(254	)		317,405
Asset backed securities		76,711		81		(56	)		76,736
Foreign government and agency debt		21,370		2		(14	)		21,358
Municipal debt securities		31,211		45		(7	)		31,249

Total short-term investments		1,005,224		958		(1,613	)		1,004,569
Long-term investments:
Available-for-sale:
Auction rate securities		11,296		—		—			11,296

Total long-term investments		11,296		—		—			11,296

Total investments	$	1,016,520	$	958	$	(1,613	)	$	1,015,865

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

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


	Three Months Ended
	April 30, 2016			May 2, 2015
Gross realized gains	$	388		$	443
Gross realized losses		(224	)		(107	)

Total net realized gains	$	164		$	336

Investments Classified by Contractual Maturity Date

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


	April 30, 2016				January 30, 2016
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	265,259	$	265,285	$	304,117	$	304,035
Due between one and five years		558,663		560,405		689,847		689,279
Due over five years		18,293		18,302		22,556		22,551

	$	842,215	$	843,992	$	1,016,520	$	1,015,865

Unrealized Loss Position Investments


	April 30, 2016
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	116,376	$	(288	)	$	23,597	$	(61	)	$	139,973	$	(349	)
U.S. government and agency debt		110,771		(90	)		4,993		(6	)		115,764		(96	)
Asset backed securities		11,562		(17	)		—		—			11,562		(17	)
Foreign government and agency debt		8,847		(8	)		—		—			8,847		(8	)
Municipal debt securities		9,387		(8	)		499		(1	)		9,886		(9	)

Total securities	$	256,943	$	(411	)	$	29,089	$	(68	)	$	286,032	$	(479	)


	January 30, 2016
	Less than 12 months					12 months or more					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	283,138	$	(1,237	)	$	14,383	$	(45	)	$	297,521	$	(1,282	)
U.S. government and agency debt		263,325		(254	)		—		—			263,325		(254	)
Asset backed securities		46,646		(56	)		—		—			46,646		(56	)
Foreign government and agency debt		16,458		(14	)		—		—			16,458		(14	)
Municipal debt securities		2,943		(5	)		1,571		(2	)		4,514		(7	)

Total securities	$	612,510	$	(1,566	)	$	15,954	$	(47	)	$	628,464	$	(1,613	)

Supplemental Financial Information (Tables)

3 Months Ended

Apr. 30, 2016

Schedule of Inventories


	April 30, 2016		January 30, 2016
Inventories:
Work-in-process	$	128,183	$	131,471
Finished goods		68,556		78,546

Total inventories	$	196,739	$	210,017

Schedule of Property, Plant and Equipment, Net


	April 30, 2016			January 30, 2016
Property and equipment, net:
Machinery and equipment	$	580,885		$	578,627
Buildings		144,320			144,320
Computer software		99,272			102,928
Land		53,373			53,373
Building improvements		49,927			49,927
Leasehold improvements		50,838			50,192
Furniture and fixtures		25,658			27,119
Construction in progress		653			1,353

		1,004,926			1,007,839
Less: Accumulated depreciation and amortization		(721,342	)		(708,299	)

Total property and equipment, net	$	283,584		$	299,540

Schedule of Other Non-current Assets


	April 30, 2016		January 30, 2016
Other non-current assets:
Technology and other licenses	$	46,078	$	48,770
Deferred tax assets		36,981		34,505
Investments in privately-held companies		5,804		5,804
Prepaid land use rights		13,045		13,123
Deposits		51,566		51,512
Other		16,304		10,996

Total other non-current assets	$	169,778	$	164,710

Schedule of Accrued Liabilities


	April 30, 2016		January 30, 2016
Accrued liabilities:
Accrued rebates	$	20,346	$	41,320
Accrued royalties		15,823		16,217
Technology license obligations		19,580		17,985
Accrued legal expense		8,218		9,761
Accrued litigation		3,350		3,830
Other		40,414		42,947

Total accrued liabilities	$	107,731	$	132,060

Schedule of Deferred Income

	April 30, 2016			January 30, 2016
Deferred income:
Net deferred revenue	$	76,412		$	77,935
Deferred cost of goods sold		(21,924	)		(22,213	)

Deferred income	$	54,488		$	55,722

Schedule of Other Non-current Liabilities

	April 30, 2016		January 30, 2016
Other non-current liabilities:
Technology license obligations	$	8,508	$	12,461
Long-term accrued employee compensation		6,350		6,078
Other		7,700		8,424

Other non-current liabilities	$	22,558	$	26,963

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			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 loss		116			—		57			173

Other comprehensive income		2,433			—		584			3,017

Balance at April 30, 2016	$	1,777		$	—	$	445		$	2,222


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

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

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

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 Statement of Operations	April 30, 2016			May 2, 2015
Interest and other income, net:
Available-for-sale securities:
Marketable securities	$	(116	)	$	332
Cash flow hedges:
Research and development		(51	)		(864	)
Selling and marketing		(1	)		(67	)
General and administrative		(5	)		(13	)

Total	$	(173	)	$	(612	)

Schedule of Interest and Other Income, Net


	Three Months Ended
	April 30, 2016			May 2, 2015
Interest and other income, net:
Interest income	$	3,442		$	4,077
Net realized gain on investments		164			336
Foreign currency exchange gain (loss)		(1,941	)		407
Other income (loss)		(59	)		567
Interest expense		(118	)		(220	)

	$	1,488		$	5,167

Schedule of Calculation of Numerator and Denominator in Earnings Per Share

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


	Three Months Ended
	April 30, 2016			May 2, 2015
Numerator:
Net income (loss)	$	(22,679	)	$	14,090

Denominator:
Weighted average shares — basic		508,794			516,228
Effect of dilutive securities:
Share-based awards		—			10,939

Weighted average shares — diluted		508,794			527,167

Net income (loss) per share:
Basic	$	(0.04	)	$	0.03
Diluted	$	(0.04	)	$	0.03

Anti-dilutive Potential Shares

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


	Three Months Ended
	April 30, 2016		May 2, 2015
Weighted average shares outstanding:
Share-based awards		42,955		58,387

Derivative Financial Instruments (Tables)

3 Months Ended

Apr. 30, 2016

Schedule of Derivative Instruments

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


	Buy Contracts
	April 30, 2016		January 31, 2016
Israeli shekel	$	11,301	$	19,082

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 for the three months ended
	Location of Gains (Losses) in Statement of Operations	April 30, 2016		May 2, 2015
Derivatives designated as cash flow hedges:
Forward contracts:	Research and development	$	186	$	(991	)
	Selling and marketing		4		(77	)
	General and administrative		22		(14	)

		$	212	$	(1,082	)

- 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. 30, 2016

Fair Value, Assets and Liabilities Measured on Recurring Basis


	Fair Value Measurements at April 30, 2016
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	12,398	$	—	$	—	$	12,398
Time deposits		—		136,733		—		136,733
U.S. government and agency debt		10,200		—		—		10,200
Corporate debt securities		—		5,796		—		5,796
Municipal debt securities		—		2,590		—		2,590
Short-term investments:
U.S. government and agency debt		213,248		—		—		213,248
Corporate debt securities		—		477,130		—		477,130
Asset backed securities		—		50,439		—		50,439
Time deposits		—		50,000		—		50,000
Foreign government and agency debt		—		15,500		—		15,500
Municipal debt securities		—		28,701		—		28,701
Prepaid expenses and other current assets:
Foreign currency forward contracts		—		404		—		404
Long-term investments:
Auction rate securities		—		—		8,974		8,974
Other non-current assets:
Severance pay fund		—		735		—		735

Total assets	$	235,846	$	768,028	$	8,974	$	1,012,848


	Fair Value Measurements at January 30, 2016
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis:
Assets
Cash equivalents:
Money market funds	$	160,400	$	—	$	—	$	160,400
Time deposits		—		209,405		—		209,405
U.S. government and agency debt		184,374		—		—		184,374
Corporate debt securities		—		54,689		—		54,689
Short-term investments:
U.S. government and agency debt		317,405		—		—		317,405
Corporate debt securities		—		557,821		—		557,821
Asset backed securities		—		76,736		—		76,736
Foreign government and agency debt		—		21,358		—		21,358
Municipal debt securities		—		31,249		—		31,249
Prepaid expenses and other current assets:
Foreign currency forward contracts		—		30		—		30
Long-term investments:
Auction rate securities		—		—		11,296		11,296
Other non-current assets:
Severance pay fund		—		678		—		678

Total assets	$	662,179	$	951,966	$	11,296	$	1,625,441

Liabilities
Accrued liabilities:
Foreign currency forward contracts	$	—	$	195	$	—	$	195

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 30, 2016			May 2, 2015
Beginning balance	$	11,296		$	10,226
Sales and redemptions		(2,322	)		—
Unrealized losses included in accumulated other comprehensive income		—			(115	)

Ending balance	$	8,974		$	10,111

Acquired Intangible Assets, Net (Tables)

3 Months Ended

Apr. 30, 2016

Schedule of Finite-Lived Intangible Assets by Major Class

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


			April 30, 2016							January 30, 2016
	Range of Useful Lives		Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amount		Gross Carrying Amounts		Accumulated Amortization and Write-Offs			Net Carrying Amounts
Purchased and core technology		4 - 8 years	$	35,498	$	(23,463	)	$	12,035	$	35,498	$	(21,910	)	$	13,588
Customer intangibles		5 - 7 years		28,600		(25,571	)		3,029		28,600		(24,178	)		4,422

Total intangible assets, net			$	64,098	$	(49,034	)	$	15,064	$	64,098	$	(46,088	)	$	18,010

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense of Identified Intangible Assets

Based on the identified intangible assets recorded at April 30, 2016, the future amortization expense of identified intangible assets for the next five fiscal years is as follows (in thousands):


Fiscal Year
Remainder of fiscal 2017	$	7,696
2018		5,508
2019		1,860
2020 and thereafter		—

	$	15,064

Restructuring and Other Related Charges (Tables)

3 Months Ended

Apr. 30, 2016

Detail of Restructuring and Other Related Charges


	Three Months Ended
	April 30, 2016			May 2, 2015
Facilities and related costs	$	3,631		$	19
Release of reserves:
Severance		(86	)		—

		3,545			19
Impairment loss and write-off of assets:
Equipment		896			573

Restructuring and other related charges	$	4,441		$	592

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

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


	Severance and Related Costs			Facilities and Related Costs			Other Exit-Related Costs			Total
Balance at January 30, 2016	$	1,155		$	1,043		$	1,644		$	3,842
Restructuring charges		—			3,631			—			3,631
Net cash payments		(825	)		(839	)		(200	)		(1,864	)
Release of reserves		(86	)		—			—			(86	)
Exchange rate adjustment		8			95			—			103

Balance at April 30, 2016	$	252		$	3,930		$	1,444		$	5,626

Shareholders' Equity (Tables)

3 Months Ended

Apr. 30, 2016

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

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


	Time-Based Options					Market-Based Options					Total
	Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price
Balance at January 30, 2016		40,874		$	13.59		2,156		$	15.43		43,030		$	13.68
Granted		1,881		$	9.78		—					1,881		$	9.78
Exercised		(45	)	$	7.00		—					(45	)	$	7.00
Canceled/Forfeited		(1,849	)	$	22.90		(2,156	)	$	15.43		(4,005	)	$	18.88

Balance at April 30, 2016		40,861		$	13.00		—					40,861		$	13.00

Vested or expected to vest at April 30, 2016		38,788		$	12.99

Exercisable at April 30, 2016		24,777		$	12.98

Schedule of Nonvested Share Activity

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


	Time-Based					Performance-Based					Market-Based					Total
	Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value
Balance at January 30, 2016		8,343		$	13.57		977		$	14.43		353		$	12.24		9,673		$	13.61
Granted		7,394		$	9.43		—					—					7,394		$	9.43
Vested		(4,946	)	$	14.16		(155	)	$	14.15		—					(5,101	)	$	14.16
Canceled/Forfeited		(218	)	$	12.85		(822	)	$	14.49		(299	)	$	12.24		(1,339	)	$	13.72

Balance at April 30, 2016		10,573		$	10.41		—					54		$	12.24		10,627		$	10.42

Schedule of Cash Dividends

The Company paid the following cash dividends:


	Three Months Ended
	April 30, 2016		May 2, 2015
Cash dividend per share	$	0.06	$	0.06

Total payment to shareholders (in thousands)	$	30,461	$	30,910

Share-Based Compensation (Tables)

3 Months Ended

Apr. 30, 2016

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

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


	Three Months Ended
	April 30, 2016			May 2, 2015
Cost of goods sold	$	1,802		$	1,547
Research and development		24,396			24,781
Selling and marketing		2,942			2,577
General and administrative		(4,687	)		4,316

	$	24,453		$	33,221

Weighted Average Assumptions Used to Calculate Fair Value Awards


	Three Months Ended
	April 30, 2016			May 2, 2015
Time-based Stock Options:
Weighted average fair value	$	2.87		$	4.54
Expected volatility		40	%		34	%
Expected term (in years)		5.2			5.4
Risk-free interest rate		1.3	%		1.5	%
Expected dividend yield		2.5	%		1.6	%

Summary of Investments (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 842,215	$ 1,016,520
Gross Unrealized Gains	2,256	958
Gross Unrealized Losses	(479)	(1,613)
Estimated Fair Value	843,992	1,015,865
Short-term Investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	833,241	1,005,224
Gross Unrealized Gains	2,256	958
Gross Unrealized Losses	(479)	(1,613)
Estimated Fair Value	835,018	1,004,569
Short-term Investments \| Time deposits
Gain (Loss) on Investments [Line Items]
Amortized Cost	50,000
Estimated Fair Value	50,000
Short-term Investments \| Corporate debt securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	475,447	558,337
Gross Unrealized Gains	2,032	766
Gross Unrealized Losses	(349)	(1,282)
Estimated Fair Value	477,130	557,821
Short-term Investments \| U.S. government and agency debt
Gain (Loss) on Investments [Line Items]
Amortized Cost	213,256	317,595
Gross Unrealized Gains	88	64
Gross Unrealized Losses	(96)	(254)
Estimated Fair Value	213,248	317,405
Short-term Investments \| Asset-backed securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	50,341	76,711
Gross Unrealized Gains	115	81
Gross Unrealized Losses	(17)	(56)
Estimated Fair Value	50,439	76,736
Short-term Investments \| Foreign government and agency debt
Gain (Loss) on Investments [Line Items]
Amortized Cost	15,504	21,370
Gross Unrealized Gains	4	2
Gross Unrealized Losses	(8)	(14)
Estimated Fair Value	15,500	21,358
Short-term Investments \| Municipal Debt Securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	28,693	31,211
Gross Unrealized Gains	17	45
Gross Unrealized Losses	(9)	(7)
Estimated Fair Value	28,701	31,249
Long-term investments
Gain (Loss) on Investments [Line Items]
Amortized Cost	8,974	11,296
Estimated Fair Value	8,974	11,296
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Amortized Cost	8,974	11,296
Estimated Fair Value	$ 8,974	$ 11,296

Investments - Additional Information (Detail) - USD ($)	3 Months Ended
Investments - Additional Information (Detail) - USD ($)	Apr. 30, 2016	May 02, 2015
Gain (Loss) on Investments [Line Items]
Impairment loss	$ 0
Proceeds from sales of available for sale securities	218,522,000	$ 152,568,000
Available for sale securities, Realized gain	388,000	$ 443,000
Long-term investments
Gain (Loss) on Investments [Line Items]
Auction rate securities, aggregate par value	10,000,000
Long-term investments \| Auction rate securities
Gain (Loss) on Investments [Line Items]
Available for sale securities, sold at par value	2,500,000
Proceeds from sales of available for sale securities	2,400,000
Carrying value of available for sale securities after previous written down	2,300,000
Available for sale securities, Realized gain	$ 100,000

Gross Realized Gains and Losses on Sales of Available-for-Sales Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	$ 388	$ 443
Gross realized losses	(224)	(107)
Total net realized gains	$ 164	$ 336

Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Amortized Cost
Due in one year or less	$ 265,259	$ 304,117
Due between one and five years	558,663	689,847
Due over five years	18,293	22,556
Amortized Cost	842,215	1,016,520
Estimated Fair Value
Due in one year or less	265,285	304,035
Due between one and five years	560,405	689,279
Due over five years	18,302	22,551
Estimated Fair Value	$ 843,992	$ 1,015,865

Summary of Investments Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 256,943	$ 612,510
Less than 12 months Unrealized Losses	(411)	(1,566)
12 months or more Fair Value	29,089	15,954
12 months or more Unrealized Losses	(68)	(47)
Total Fair Value	286,032	628,464
Total Unrealized Losses	(479)	(1,613)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	116,376	283,138
Less than 12 months Unrealized Losses	(288)	(1,237)
12 months or more Fair Value	23,597	14,383
12 months or more Unrealized Losses	(61)	(45)
Total Fair Value	139,973	297,521
Total Unrealized Losses	(349)	(1,282)
U.S. government and agency debt
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	110,771	263,325
Less than 12 months Unrealized Losses	(90)	(254)
12 months or more Fair Value	4,993
12 months or more Unrealized Losses	(6)
Total Fair Value	115,764	263,325
Total Unrealized Losses	(96)	(254)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	11,562	46,646
Less than 12 months Unrealized Losses	(17)	(56)
Total Fair Value	11,562	46,646
Total Unrealized Losses	(17)	(56)
Foreign government and agency debt
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	8,847	16,458
Less than 12 months Unrealized Losses	(8)	(14)
Total Fair Value	8,847	16,458
Total Unrealized Losses	(8)	(14)
Municipal Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	9,387	2,943
Less than 12 months Unrealized Losses	(8)	(5)
12 months or more Fair Value	499	1,571
12 months or more Unrealized Losses	(1)	(2)
Total Fair Value	9,886	4,514
Total Unrealized Losses	$ (9)	$ (7)

Inventories (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Inventory [Line Items]
Work-in-process	$ 128,183	$ 131,471
Finished goods	68,556	78,546
Total inventories	$ 196,739	$ 210,017

Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,004,926	$ 1,007,839
Less: Accumulated depreciation and amortization	(721,342)	(708,299)
Total property and equipment, net	283,584	299,540
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	580,885	578,627
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	144,320	144,320
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	99,272	102,928
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	53,373	53,373
Building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	49,927	49,927
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	50,838	50,192
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	25,658	27,119
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 653	$ 1,353

Other Non-current Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Other non-current assets:
Technology and other licenses	$ 46,078	$ 48,770
Deferred tax assets	36,981	34,505
Investments in privately-held companies	5,804	5,804
Prepaid land use rights	13,045	13,123
Deposits	51,566	51,512
Other	16,304	10,996
Total other non-current assets	$ 169,778	$ 164,710

Accrued Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Accrued liabilities:
Accrued rebates	$ 20,346	$ 41,320
Accrued royalties	15,823	16,217
Technology license obligations	19,580	17,985
Accrued legal expense	8,218	9,761
Accrued litigation	3,350	3,830
Other	40,414	42,947
Total accrued liabilities	$ 107,731	$ 132,060

Deferred Income (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Deferred Revenue Arrangement [Line Items]
Net deferred revenue	$ 76,412	$ 77,935
Deferred cost of goods sold	(21,924)	(22,213)
Deferred income	$ 54,488	$ 55,722

- 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

Other Non-current Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Other non-current liabilities:
Technology license obligations	$ 8,508	$ 12,461
Long-term accrued employee compensation	6,350	6,078
Other	7,700	8,424
Other non-current liabilities	$ 22,558	$ 26,963

Changes in Accumulated Other Comprehensive Income (Loss) by Components (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 4,140,123
Other comprehensive income (loss), net of tax	3,017	$ (228)
Ending Balance	4,099,818
Unrealized Gain (Loss) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(656)	3,768
Other comprehensive income before reclassifications	2,317	(1,528)
Amounts reclassified from accumulated other comprehensive income (loss)	116	(332)
Other comprehensive income (loss), net of tax	2,433	(1,860)
Ending Balance	1,777	1,908
Unrealized Gain (Loss) on Auction Rate Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(2,274)
Other comprehensive income before reclassifications		(115)
Other comprehensive income (loss), net of tax		(115)
Ending Balance		(2,389)
Unrealized Gain (Loss) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(139)	(1,186)
Other comprehensive income before reclassifications	527	803
Amounts reclassified from accumulated other comprehensive income (loss)	57	944
Other comprehensive income (loss), net of tax	584	1,747
Ending Balance	445	561
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(795)	308
Other comprehensive income before reclassifications	2,844	(840)
Amounts reclassified from accumulated other comprehensive income (loss)	173	612
Other comprehensive income (loss), net of tax	3,017	(228)
Ending Balance	$ 2,222	$ 80

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) by Components (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other income, net	$ 1,488	$ 5,167
Research and development	(240,458)	(280,114)
Selling and marketing	(31,379)	(36,174)
General and administrative	(31,995)	(40,435)
Net income (loss)	(22,679)	14,090
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(173)	(612)
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Gain (Loss) on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other income, net	(116)	332
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Gain (Loss) on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Research and development	(51)	(864)
Selling and marketing	(1)	(67)
General and administrative	$ (5)	$ (13)

Interest and Other Income, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Interest and other income, net:
Interest income	$ 3,442	$ 4,077
Net realized gain on investments	164	336
Foreign currency exchange gain (loss)	(1,941)	407
Other income (loss)	(59)	567
Interest expense	(118)	(220)
Interest and other income, net	$ 1,488	$ 5,167

- Definition

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

+ References + Details

Computations of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Numerator:
Net income (loss)	$ (22,679)	$ 14,090
Denominator:
Weighted average shares - basic	508,794	516,228
Effect of dilutive securities:
Share-based awards		10,939
Weighted average shares - diluted	508,794	527,167
Basic	$ (0.04)	$ 0.03
Diluted	$ (0.04)	$ 0.03

Anti-dilutive Potential Shares (Detail) - shares shares in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Weighted average shares outstanding:
Share-based awards	42,955	58,387

Notional Amounts of Outstanding Foreign Currency Forward Contracts (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Foreign Exchange Buy Contracts \| Israeli shekel
Derivative [Line Items]
Derivative, notional amount	$ 11,301	$ 19,082

Information about Gains (Losses) Associated with Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ 212	$ (1,082)
Cash flow hedges \| Foreign currency forward contracts \| Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	186	(991)
Cash flow hedges \| Foreign currency forward contracts \| Selling and marketing
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	4	(77)
Cash flow hedges \| Foreign currency forward contracts \| General and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ 22	$ (14)

Derivative Financial Instruments - Additional Information (Detail)	3 Months Ended
	Apr. 30, 2016 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash flow hedges were terminated as a result of forecasted transactions that did not occur	$ 0

Fair Value Measurements - Additional Information (Detail)	Apr. 30, 2016
Fair Value, Measurement Inputs, Disclosure [Line Items]
Percentage of total amount of assets measured using Level 3 valuation methodologies to total assets	0.20%

Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Detail) - Items measured at fair value - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Assets
Total assets	$ 1,012,848	$ 1,625,441
Other non-current assets \| Severance Pay Fund
Assets
Other non-current asset	735	678
Foreign currency forward contracts
Liabilities
Accrued liabilities		195
Foreign currency forward contracts \| Prepaid expenses and other current assets
Assets
Prepaid expenses and other current assets	404	30
Cash equivalents \| U.S. government and agency debt
Assets
Cash equivalents	10,200	184,374
Cash equivalents \| Money market funds
Assets
Cash equivalents	12,398	160,400
Cash equivalents \| Time deposits
Assets
Cash equivalents	136,733	209,405
Cash equivalents \| Municipal Debt Securities
Assets
Cash equivalents	2,590
Cash equivalents \| Corporate debt securities
Assets
Cash equivalents	5,796	54,689
Short-term Investments \| U.S. government and agency debt
Assets
Investments	213,248	317,405
Short-term Investments \| Time deposits
Assets
Investments	50,000
Short-term Investments \| Municipal Debt Securities
Assets
Investments	28,701	31,249
Short-term Investments \| Corporate debt securities
Assets
Investments	477,130	557,821
Short-term Investments \| Asset-backed securities
Assets
Investments	50,439	76,736
Short-term Investments \| Foreign government and agency debt
Assets
Investments	15,500	21,358
Long-term investments \| Auction rate securities
Assets
Investments	8,974	11,296
Level 1
Assets
Total assets	235,846	662,179
Level 1 \| Cash equivalents \| U.S. government and agency debt
Assets
Cash equivalents	10,200	184,374
Level 1 \| Cash equivalents \| Money market funds
Assets
Cash equivalents	12,398	160,400
Level 1 \| Short-term Investments \| U.S. government and agency debt
Assets
Investments	213,248	317,405
Level 2
Assets
Total assets	768,028	951,966
Level 2 \| Other non-current assets \| Severance Pay Fund
Assets
Other non-current asset	735	678
Level 2 \| Foreign currency forward contracts
Liabilities
Accrued liabilities		195
Level 2 \| Foreign currency forward contracts \| Prepaid expenses and other current assets
Assets
Prepaid expenses and other current assets	404	30
Level 2 \| Cash equivalents \| Time deposits
Assets
Cash equivalents	136,733	209,405
Level 2 \| Cash equivalents \| Municipal Debt Securities
Assets
Cash equivalents	2,590
Level 2 \| Cash equivalents \| Corporate debt securities
Assets
Cash equivalents	5,796	54,689
Level 2 \| Short-term Investments \| Time deposits
Assets
Investments	50,000
Level 2 \| Short-term Investments \| Municipal Debt Securities
Assets
Investments	28,701	31,249
Level 2 \| Short-term Investments \| Corporate debt securities
Assets
Investments	477,130	557,821
Level 2 \| Short-term Investments \| Asset-backed securities
Assets
Investments	50,439	76,736
Level 2 \| Short-term Investments \| Foreign government and agency debt
Assets
Investments	15,500	21,358
Level 3
Assets
Total assets	8,974	11,296
Level 3 \| Long-term investments \| Auction rate securities
Assets
Investments	$ 8,974	$ 11,296

Change in Fair Values for Level Three Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 11,296	$ 10,226
Sales and redemptions	(2,322)
Unrealized losses included in accumulated other comprehensive income		(115)
Ending balance	$ 8,974	$ 10,111

Acquired Intangible Assets Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Jan. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	$ 64,098	$ 64,098
Accumulated Amortization and Write-Offs	(49,034)	(46,088)
Net Carrying Amount	15,064	18,010
Purchased and core technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts, Finite-Lived	35,498	35,498
Accumulated Amortization and Write-Offs	(23,463)	(21,910)
Net Carrying Amounts, Finite-Lived	12,035	13,588
Customer intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts, Finite-Lived	28,600	28,600
Accumulated Amortization and Write-Offs	(25,571)	(24,178)
Net Carrying Amounts, Finite-Lived	$ 3,029	$ 4,422
Minimum \| Purchased and core technology
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	4 years
Minimum \| Customer intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	5 years
Maximum \| Purchased and core technology
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	8 years
Maximum \| Customer intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Lives	7 years

Future Amortization Expense of Identified Intangible Assets (Detail) - In Process Research and Development Excluded $ in Thousands	Apr. 30, 2016 USD ($)
Fiscal Year
Remainder of fiscal 2017	$ 7,696
2018	5,508
2019	1,860
2020 and thereafter	0
Net Carrying Amounts, Finite-Lived	$ 15,064

Detail of Restructuring and Other Related Charges (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Restructuring Cost and Reserve [Line Items]
Facilities and related costs	$ 3,631	$ 19
Release of reserves, Severance	(86)
Restructuring Costs, Total	3,545	19
Impairment loss and write-off of assets: Equipment	896	573
Restructuring and other related charges	$ 4,441	$ 592

Restructuring and Other Related Charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring Costs and Asset Impairment Charges	$ 4,441	$ 592
Restructuring charges	3,631
Net restructuring charges	800
Cumulative restructuring charges	45,300
Facilities and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,631
Severance benefits
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges	28,100
Loss on early contract termination
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges	1,600
Impairment of technology licenses and certain equipment
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges	7,600
Write down of inventory
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges	8,000
Facility in Israel \| Facilities and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,631

Reconciliation of Beginning and Ending Restructuring Liability Balances by Major Type of Costs (Detail) $ in Thousands	3 Months Ended
	Apr. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of balance	$ 3,842
Restructuring charges	3,631
Net cash payments	(1,864)
Release of reserves	(86)
Exchange rate adjustment	103
Restructuring liabilities, ending balance	5,626
Severance and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of balance	1,155
Net cash payments	(825)
Release of reserves	(86)
Exchange rate adjustment	8
Restructuring liabilities, ending balance	252
Facilities and Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of balance	1,043
Restructuring charges	3,631
Net cash payments	(839)
Exchange rate adjustment	95
Restructuring liabilities, ending balance	3,930
Other Exit-Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities, beginning of balance	1,644
Net cash payments	(200)
Restructuring liabilities, ending balance	$ 1,444

Income Tax - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Income Taxes [Line Items]
Current income tax (benefit) liability	$ (2.7)	$ 4.3
Deferred tax expense (benefit)	(2.5)
Net increase (decrease) in unrecognized tax benefits	0.2	(3.1)
Reduction in unrecognized tax benefits arising from the expiration of statute of limitations	0.5	4.0
Unrecognized tax benefit, interest and penalties accrued	0.7	0.9
Additional tax provision		3.1
Uncertain tax positions decrease from the lapse of statutes of limitation in various jurisdictions during next 12 months	(16.3)
Tax incentives, tax savings amount	0.9	3.3
Cash, cash equivalents and short-term investments	1,600.0
Undistributed earnings of foreign subsidiaries	$ 570.0
Chief Executive Officer
Income Taxes [Line Items]
Liability to related party		$ 15.4
Maximum
Income Taxes [Line Items]
Tax incentives, per share effect on earning	$ 0.01	$ 0.01
Foreign Subsidiaries
Income Taxes [Line Items]
Additional tax provision	$ 175.0
Cash, cash equivalents and short-term investments	$ 760.0

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended
	Feb. 16, 2016	Dec. 26, 2012	Apr. 30, 2016	Nov. 14, 2014
Commitments and Contingencies Disclosure [Line Items]
Accrued liability related to legal proceedings			$ 3.4
Carrying value of pledged assets			$ 131.4
Carnegie Mellon Litigation
Commitments and Contingencies Disclosure [Line Items]
Date of lawsuit filed			Mar. 06, 2009
Loss contingency, awarded amount		$ 1,170.0	$ 1,540.0
Amount agreed to pay pursuant to settlement			750.0
Settlement Agreement and Patent License
Commitments and Contingencies Disclosure [Line Items]
Amount agreed to pay pursuant to settlement	$ 750.0		750.0
Primary Surety Bond
Commitments and Contingencies Disclosure [Line Items]
Bond	439.0
Secondary Surety Bond
Commitments and Contingencies Disclosure [Line Items]
Bond	$ 311.0
Surety Bond
Commitments and Contingencies Disclosure [Line Items]
Bond			1,540.0	$ 216.0
Commitment Letter
Commitments and Contingencies Disclosure [Line Items]
Bond				$ 95.0
Manufacturing Expense
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment, outstanding commitment			$ 168.5

Stock Option Plan Activity (Detail) shares in Thousands	3 Months Ended
Stock Option Plan Activity (Detail) shares in Thousands	Apr. 30, 2016 $ / shares shares
Options Outstanding
Beginning Balance \| shares	43,030
Granted \| shares	1,881
Exercised \| shares	(45)
Canceled/Forfeited \| shares	(4,005)
Ending Balance \| shares	40,861
Weighted Average Exercise Price
Beginning Balance \| $ / shares	$ 13.68
Granted \| $ / shares	9.78
Exercised \| $ / shares	7.00
Canceled/Forfeited \| $ / shares	18.88
Ending Balance \| $ / shares	$ 13.00
Time Based Option Award
Options Outstanding
Beginning Balance \| shares	40,874
Granted \| shares	1,881
Exercised \| shares	(45)
Canceled/Forfeited \| shares	(1,849)
Ending Balance \| shares	40,861
Vested or expected to vest at April 30, 2016 \| shares	38,788
Exercisable at April 30, 2016 \| shares	24,777
Weighted Average Exercise Price
Beginning Balance \| $ / shares	$ 13.59
Granted \| $ / shares	9.78
Exercised \| $ / shares	7.00
Canceled/Forfeited \| $ / shares	22.90
Ending Balance \| $ / shares	13.00
Vested or expected to vest at April 30, 2016 \| $ / shares	12.99
Exercisable at April 30, 2016 \| $ / shares	$ 12.98
Market Based Option Award
Options Outstanding
Beginning Balance \| shares	2,156
Canceled/Forfeited \| shares	(2,156)
Weighted Average Exercise Price
Beginning Balance \| $ / shares	$ 15.43
Canceled/Forfeited \| $ / shares	$ 15.43

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	May 08, 2016	Apr. 01, 2016	Apr. 30, 2016	May 02, 2015	Apr. 29, 2016
Stockholders Equity Note [Line Items]
Closing stock price					$ 9.98
Share repurchase program, shares repurchased			0	1,400,000
Share repurchase program, amount repurchased				$ 22.1
Share repurchase program, cumulative shares repurchased			241,600,000
Share repurchase program, total amount of repurchases			$ 3,100.0
Share repurchase program, remaining available for future share repurchases			$ 182.6
Dividend per share, declared			$ 0.06	$ 0.06
Subsequent Event
Stockholders Equity Note [Line Items]
Dividend per share, declared	$ 0.06
Dividends declared, date to be paid	Jul. 12, 2016
Dividends declared, date of record	Jun. 14, 2016
Time Based Option Award
Stockholders Equity Note [Line Items]
Options vested and expected to vest, aggregate intrinsic value			$ 10.9
Options vested and expected to vest, weighted average remaining contractual term (in years)			5 years 9 months 18 days
Options exercisable, aggregate intrinsic value			$ 10.3
Options exercisable, weighted average remaining contractual term (in years)			4 years 6 months
Aggregate intrinsic value of stock options exercised			$ 0.1	$ 6.3
Unrecognized share based compensation cost			$ 36.2
Unrecognized share based compensation cost, weighted-average period of recognition			2 years 1 month 6 days
Performance Based Restricted Stock Unit
Stockholders Equity Note [Line Items]
Vested			155,000
Performance Based Restricted Stock Unit \| Executive Officer
Stockholders Equity Note [Line Items]
Vested		33,616
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Unrecognized share based compensation cost			$ 93.6
Unrecognized share based compensation cost, weighted-average period of recognition			1 year 9 months 18 days
Vested			5,101,000
Restricted stock units, aggregate intrinsic value			$ 95.1
Restricted stock units vested and expected to vest			9,500,000
Market Based Option Award
Stockholders Equity Note [Line Items]
Stock option expiration date			Apr. 30, 2016
Stock option, expiration term			5 years
Employee Stock Purchase Plan, 2000 Restated Plan
Stockholders Equity Note [Line Items]
Unrecognized share based compensation cost			$ 38.4
Employee stock purchase plan, shares issued			0	0

Activity Related to Non Vested Portion of Restricted Stock Units (Detail) shares in Thousands	3 Months Ended
	Apr. 30, 2016 $ / shares shares
Time Based Restricted Units
Restricted Stock Units Outstanding
Beginning Balance \| shares	8,343
Granted \| shares	7,394
Vested \| shares	(4,946)
Canceled/Forfeited \| shares	(218)
Ending Balance \| shares	10,573
Weighted Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 13.57
Granted \| $ / shares	9.43
Vested \| $ / shares	14.16
Canceled/Forfeited \| $ / shares	12.85
Ending Balance \| $ / shares	$ 10.41
Performance Based Restricted Stock Unit
Restricted Stock Units Outstanding
Beginning Balance \| shares	977
Vested \| shares	(155)
Canceled/Forfeited \| shares	(822)
Weighted Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 14.43
Vested \| $ / shares	14.15
Canceled/Forfeited \| $ / shares	$ 14.49
Market Based Restricted Stock Unit
Restricted Stock Units Outstanding
Beginning Balance \| shares	353
Canceled/Forfeited \| shares	(299)
Ending Balance \| shares	54
Weighted Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 12.24
Canceled/Forfeited \| $ / shares	12.24
Ending Balance \| $ / shares	$ 12.24
Restricted Stock Units (RSUs)
Restricted Stock Units Outstanding
Beginning Balance \| shares	9,673
Granted \| shares	7,394
Vested \| shares	(5,101)
Canceled/Forfeited \| shares	(1,339)
Ending Balance \| shares	10,627
Weighted Average Grant Date Fair Value
Beginning Balance \| $ / shares	$ 13.61
Granted \| $ / shares	9.43
Vested \| $ / shares	14.16
Canceled/Forfeited \| $ / shares	13.72
Ending Balance \| $ / shares	$ 10.42

Schedule of Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Cash dividend
Cash dividend per share	$ 0.06	$ 0.06
Total payment to shareholders (in thousands)	$ 30,461	$ 30,910

Total Stock Compensation by Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 24,453	$ 33,221
Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,802	1,547
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	24,396	24,781
Selling and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	2,942	2,577
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ (4,687)	$ 4,316

Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2016	May 02, 2015	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reversal of previously recognized share-based compensation expense	$ 6.9
Stock-based compensation capitalized in inventory	$ 1.8		$ 1.5
Stock purchase rights granted	1,881,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock purchase rights granted	0	0

Weighted Average Assumptions Used to Calculate Fair Value of Time Based Equity Award (Detail) - Time Based Option Award - $ / shares	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value	$ 2.87	$ 4.54
Expected volatility	40.00%	34.00%
Expected term (in years)	5 years 2 months 12 days	5 years 4 months 24 days
Risk-free interest rate	1.30%	1.50%
Expected dividend yield	2.50%	1.60%

Carnegie Mellon University Settlement - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Feb. 16, 2016	Apr. 30, 2016
Carnegie Mellon Litigation
Loss Contingencies [Line Items]
Litigation settlement, amount		$ 750.0
Carnegie Mellon Litigation \| Cost of goods sold
Loss Contingencies [Line Items]
Litigation settlement, amount		1.6
Carnegie Mellon Litigation \| Mutual release of claims and covenant not to sue provisions \| Operating Expense
Loss Contingencies [Line Items]
Litigation settlement, amount		654.7
Carnegie Mellon Litigation \| Licensing of intellectual property \| Cost of goods sold
Loss Contingencies [Line Items]
Litigation settlement, amount		$ 81.3
Carnegie Mellon Litigation \| Future license settlement
Loss Contingencies [Line Items]
License expiration period		From February 2016 through April 2018.
Carnegie Mellon Litigation \| Future license settlement \| Cost of Goods Sold for Past Use
Loss Contingencies [Line Items]
Litigation settlement, amount		$ 14.0
Settlement Agreement and Patent License
Loss Contingencies [Line Items]
Litigation settlement, amount	$ 750.0	750.0
Litigation Settlement amount paid		$ 750.0

Changes in the Company's Organization - Additional Information (Detail)	3 Months Ended
	Apr. 30, 2016 Director
Reorganization [Line Items]
Number of independent directors	4