Xilinx (XLNX) 10-Q 28 Oct 15 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Sep. 26, 2015	Oct. 16, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 26, 2015
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Entity Registrant Name	XILINX INC
Entity Central Index Key	743,988
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--04-02
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		256,975,016

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Net revenues	$ 527,572	$ 604,262	$ 1,076,580	$ 1,216,895
Cost of revenues	157,640	169,617	317,594	358,806
Gross margin	369,932	434,645	758,986	858,089
Operating expenses:
Research and development	130,220	138,335	256,868	260,348
Selling, general and administrative	84,761	93,883	166,904	186,396
Amortization of acquisition-related intangibles	1,769	2,378	3,538	4,796
Total operating expenses	216,750	234,596	427,310	451,540
Operating income	153,182	200,049	331,676	406,549
Interest and other expense, net	9,213	5,731	19,740	11,953
Income before income taxes	143,969	194,318	311,936	394,596
Provision for income taxes	16,671	22,802	36,923	49,469
Net income	$ 127,298	$ 171,516	$ 275,013	$ 345,127
Net income per common share:
Basic (in dollars per share)	$ 0.49	$ 0.64	$ 1.07	$ 1.29
Diluted (in dollars per share)	0.48	0.62	1.03	1.24
Cash dividends per common share	$ 0.31	$ 0.29	$ 0.62	$ 0.58
Shares used in per share calculations:
Basic (in shares)	257,640	265,942	257,744	267,098
Diluted (in shares)	266,046	275,800	268,070	278,784

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 127,298	$ 171,516	$ 275,013	$ 345,127
Other comprehensive income (loss), net of tax:
Change in net unrealized gains (losses) on available-for-sale securities	(253)	(3,728)	(5,180)	4,231
Reclassification adjustment for gains on available-for-sale securities	(18)	(927)	(196)	(1,318)
Change in net unrealized losses on hedging transactions	(2,496)	(3,602)	(378)	(3,060)
Reclassification adjustment for (gains) losses on hedging transactions	2,071	(211)	3,944	(1,018)
Cumulative translation adjustment, net	(623)	(578)	(1,546)	(407)
Other comprehensive loss	(1,319)	(9,046)	(3,356)	(1,572)
Total comprehensive income	$ 125,979	$ 162,470	$ 271,657	$ 343,555

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015	[1]
Current assets:
Cash and cash equivalents	$ 760,611	$ 892,572
Short-term investments	2,535,173	2,410,489
Accounts receivable, net	282,627	246,615
Inventories	212,973	231,328
Deferred tax assets	100,294	79,519
Prepaid expenses and other current assets	89,483	74,528
Total current assets	3,981,161	3,935,051
Property, plant and equipment, at cost	809,662	804,623
Accumulated depreciation and amortization	(522,285)	(503,585)
Net property, plant and equipment	287,377	301,038
Long-term investments	235,922	266,902
Goodwill	159,296	159,296
Acquisition-related intangibles, net	9,214	12,752
Other assets	217,380	223,026
Total Assets	4,890,350	4,898,065
Current liabilities:
Accounts payable	75,279	80,113
Accrued payroll and related liabilities	154,876	156,600
Income taxes payable	6,657	19,693
Deferred income on shipments to distributors	81,707	66,071
Other accrued liabilities	50,243	64,676
Current portion of long-term debt	581,580	576,053
Total current liabilities	950,342	963,206
Long-term debt	995,333	994,839
Deferred tax liabilities	308,662	289,868
Long-term income taxes payable	13,033	13,245
Other long-term liabilities	1,311	1,366
Commitments and contingencies	0	0
Temporary equity (Note 10)	18,420	23,947
Stockholders' equity:
Preferred stock, $.01 par value (none issued)	0	0
Common stock, $.01 par value	2,569	2,583
Additional paid-in capital	683,140	653,882
Retained earnings	1,932,046	1,966,278
Accumulated other comprehensive loss	(14,506)	(11,149)
Total stockholders’ equity	2,603,249	2,611,594
Total Liabilities, Temporary Equity and Stockholders’ Equity	$ 4,890,350	$ 4,898,065
[1]	Derived from audited financial statements

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 26, 2015	Mar. 28, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares issued (none issued)	0	0
Common stock, par value	$ 0.01	$ 0.01

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 26, 2015		Sep. 27, 2014
Cash flows from operating activities:
Net income	$ 275,013		$ 345,127
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	25,725		27,146
Amortization	8,708		10,508
Stock-based compensation	53,001		50,846
Net gain on sale of available-for-sale securities	(618)		(2,412)
Amortization of debt discounts	6,019		6,008
Provision for deferred income taxes	1,129		26,304
Excess tax benefit from stock-based compensation	(10,455)		(13,775)
Changes in assets and liabilities:
Accounts receivable, net	(36,013)		(22,796)
Inventories	18,119		(28,409)
Prepaid expenses and other current assets	(9,051)		(13,250)
Other assets	(3,106)		(2,871)
Accounts payable	(4,834)		(44,006)
Accrued liabilities	(11,909)		7,066
Income taxes payable	(10,481)		(17,237)
Deferred income on shipments to distributors	15,636		5,751
Net cash provided by operating activities	316,883		334,000
Cash flows from investing activities:
Purchases of available-for-sale securities	(1,349,852)		(1,566,289)
Proceeds from sale and maturity of available-for-sale securities	1,248,939		1,432,191
Purchases of property, plant and equipment	(13,051)		(17,543)
Other investing activities	242		(5,251)
Net cash used in investing activities	(113,722)		(156,892)
Cash flows from financing activities:
Repurchases of common stock	(199,998)		(301,015)
Proceeds from issuance of common stock through various stock plans, net	14,823		5,532
Payment of dividends to stockholders	(160,402)		(154,378)
Excess tax benefit from stock-based compensation	10,455		13,775
Net cash used in financing activities	(335,122)		(436,086)
Net decrease in cash and cash equivalents	(131,961)		(258,978)
Cash and cash equivalents at beginning of period	892,572	[1]	973,677
Cash and cash equivalents at end of period	760,611		714,699
Supplemental disclosure of cash flow information:
Interest paid	20,688		20,901
Income taxes paid, net	$ 46,121		$ 40,139
[1]	Derived from audited financial statements

Basis of Presentation

Basis of Presentation	6 Months Ended
	Sep. 26, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Basis of Presentation The accompanying interim condensed consolidated financial statements have been prepared in conformity with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X, and should be read in conjunction with the Xilinx, Inc. (Xilinx or the Company) consolidated financial statements filed with the U.S. Securities and Exchange Commission (SEC) on Form 10-K for the fiscal year ended March 28, 2015 . The interim financial statements are unaudited, but reflect all adjustments which are, in the opinion of management, of a normal, recurring nature necessary to provide a fair statement of results for the interim periods presented. The results of operations for the interim periods shown in this report are not necessarily indicative of the results that may be expected for the fiscal year ending April 2, 2016 or any future period. The Company uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2016 will be a 53-week year ending on April 2, 2016 , while fiscal 2015 was a 52-week year ending on March 28, 2015 . Accordingly, the third quarter of fiscal 2016 will be a 14-week quarter ending on January 2, 2016. The quarters ended September 26, 2015 and September 27, 2014 each included 13 weeks.

Recent Accounting Changes and A

Recent Accounting Changes and Accounting Pronouncements	6 Months Ended
	Sep. 26, 2015
Accounting Changes and Error Corrections [Abstract]
Accounting Changes and Error Corrections [Text Block]	Recent Accounting Changes and Accounting Pronouncements In April 2014, the Financial Accounting Standards Board (FASB) issued the authoritative guidance that outlines a new global revenue recognition standard that replaces virtually all existing US GAAP guidance on contracts with customers and the related other assets and deferred costs. The guidance provides a five-step process for recognizing revenue that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also requires expanded qualitative and quantitative disclosures relating to the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. In July 2015, FASB approved the deferral of the effective date of this guidance by one year. As a result, this guidance will be effective for the Company beginning in fiscal year 2019, with an option to early adopt in fiscal year 2018. The new standard is required to be applied retrospectively to each prior reporting period presented, or retrospectively with the cumulative effect of initially applying it recognized at the date of initial application. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements, including selection of the transition method and the adoption date. In May 2015, the FASB issued the authoritative guidance that eliminates current requirement to categorize within the fair value hierarchy investments whose fair values are measured at net asset value using the practical expedient approach. Instead, entities will be required to disclose the fair values of such investments so that financial statement users can reconcile amounts reported in the fair value hierarchy table and the amounts reported on the balance sheet. This guidance is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, which for Xilinx would be the first quarter of fiscal year 2017 and should be applied using a retrospective approach. Earlier adoption is permitted. This guidance does not affect the underlying accounting for such investments. In July 2015, the FASB issued the authoritative guidance that requires an entity to measure inventory at the lower of cost or net realizable value (NRV). NRV is the estimated selling price in the ordinary course of business, less reasonably predictable cost of completion, disposal, and transportation. This guidance is effective for reporting periods beginning after December 15, 2016, including interim periods within those fiscal years, which for Xilinx would be the first quarter of fiscal year 2018. The amendments should be applied prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. T he Company is currently evaluating the impact of this new guidance on its consolidated financial statements. In August 2015, FASB issued the authoritative guidance that clarifies the guidance regarding presentation and subsequent measurement of debt issuance costs related to line-of-credit arrangements. This guidance clarifies that an entity may defer and present debt issuance costs as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company does not expect the adoption of this guidance to have significant impact on its consolidated financial statements.

Significant Customers and Conce

Significant Customers and Concentrations of Credit Risk (Notes)	6 Months Ended
	Sep. 26, 2015
Significant Customers and Concentrations of Credit Risk [Abstract]
Concentration Risk Disclosure [Text Block]	Significant Customers and Concentrations of Credit Risk Avnet, Inc. (Avnet), one of the Company’s distributors, distributes the Company’s products worldwide. As of September 26, 2015 and March 28, 2015 , Avnet accounted for 70% and 67% of the Company’s total net accounts receivable, respectively. For the second quarter and first six months of fiscal 2016 , resale of product through Avnet accounted for 50% and 51% of the Company’s worldwide net revenues, respectively. Resale of product through Avnet accounted for 43% of the Company’s worldwide net revenues for both the second quarter and the first six months of fiscal 2015 . Xilinx is subject to concentrations of credit risk primarily in its trade accounts receivable and investments in debt securities to the extent of the amounts recorded on the consolidated balance sheet. The Company attempts to mitigate the concentration of credit risk in its trade receivables through its credit evaluation process, collection terms, distributor sales to diverse end customers and through geographical dispersion of sales. Xilinx generally does not require collateral for receivables from its end customers or from distributors. No end customer accounted for more than 10% of the Company’s worldwide net revenues for the second quarter as well as the first six months of fiscal 2016 and 2015 . The Company mitigates concentrations of credit risk in its investments in debt securities by currently investing approximately 89% of its portfolio in AA or higher grade securities as rated by Standard & Poor’s or Moody’s Investors Service. The Company’s methods to arrive at investment decisions are not solely based on the rating agencies’ credit ratings. Xilinx also performs additional credit due diligence and conducts regular portfolio credit reviews, including a review of counterparty credit risk related to the Company’s forward currency exchange contracts. Additionally, Xilinx limits its investments in the debt securities of a single issuer based upon the issuer’s credit rating and attempts to further mitigate credit risk by diversifying risk across geographies and type of issuer. As of September 26, 2015 , approximately 33% of the portfolio consisted of mortgage-backed securities. All of the mortgage-backed securities in the investment portfolio were issued by U.S. government-sponsored enterprises and agencies and are rated AA+ by Standard & Poor’s and AAA by Moody’s Investors Service.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Sep. 26, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The guidance for fair value measurements established by the FASB defines fair value as the exchange price that would be received from selling an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which Xilinx would transact and also considers assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions and risk of nonperformance. The Company determines the fair value for marketable debt securities using industry standard pricing services, data providers and other third-party sources and by internally performing valuation testing and analysis. The Company primarily uses a consensus price or weighted-average price for its fair value assessment. The Company determines the consensus price using market prices from a variety of industry standard pricing services, data providers, security master files from large financial institutions and other third party sources and uses those multiple prices as inputs into a distribution-curve-based algorithm to determine the daily market value. The pricing services use multiple inputs to determine market prices, including reportable trades, benchmark yield curves, credit spreads and broker/dealer quotes as well as other industry and economic events. For certain securities with short maturities, such as discount commercial paper and certificates of deposit, the security is accreted from purchase price to face value at maturity. If a subsequent transaction on the same security is observed in the marketplace, the price on the subsequent transaction is used as the current daily market price and the security will be accreted to face value based on the revised price. For certain other securities, such as student loan auction rate securities, the Company performs its own valuation analysis using a discounted cash flow pricing model. The Company validates the consensus prices by taking random samples from each asset type and corroborating those prices using reported trade activity, benchmark yield curves, binding broker/dealer quotes or other relevant price information. There have not been any changes to the Company’s fair value methodology during the first six months of fiscal 2016 and the Company did not adjust or override any fair value measurements as of September 26, 2015 . Fair Value Hierarchy The fair value framework requires the categorization of assets and liabilities into three levels based upon the assumptions (inputs) used to price the assets or liabilities. The guidance for fair value measurements requires that assets and liabilities carried at fair value be classified and disclosed in one of the following categories: Level 1 — Quoted (unadjusted) prices in active markets for identical assets or liabilities. The Company’s Level 1 assets consist of U.S. government and agency securities and money market funds. Level 2 — Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability. The Company’s Level 2 assets consist of financial institution securities, non-financial institution securities, municipal bonds, U.S. government and agency securities, foreign government and agency securities, mortgage-backed securities, debt mutual funds, bank loans, asset-backed securities and commercial mortgage-backed securities. The Company’s Level 2 assets and liabilities also include foreign currency forward contracts and commodity swap contracts. Level 3 — Unobservable inputs to the valuation methodology that are supported by little or no market activity and that are significant to the measurement of the fair value of the assets or liabilities. Level 3 assets and liabilities include those whose fair value measurements are determined using pricing models, discounted cash flow methodologies or similar valuation techniques, as well as significant management judgment or estimation. The Company’s Level 3 assets and liabilities include student loan auction rate securities. Assets and Liabilities Measured at Fair Value on a Recurring Basis In instances where the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset or liability. The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis as of September 26, 2015 and March 28, 2015 : September 26, 2015 (In thousands) Quoted Significant Significant Total Fair Assets Cash equivalents: Money market funds $ 203,815 $ — $ — $ 203,815 Financial institution securities — 75,006 — 75,006 Non-financial institution securities — 257,342 — 257,342 U.S. government and agency securities — 5,000 — 5,000 Foreign government and agency securities — 75,924 — 75,924 Short-term investments: Financial institution securities — 225,000 — 225,000 Non-financial institution securities — 214,189 — 214,189 Municipal bonds — 55,856 — 55,856 U.S. government and agency securities 150,481 296,097 — 446,578 Foreign government and agency securities — 125,557 — 125,557 Asset-backed securities — 207,461 — 207,461 Mortgage-backed securities — 963,354 — 963,354 Debt mutual funds — 34,650 — 34,650 Bank loans — 104,052 — 104,052 Commercial mortgage-backed securities — 158,476 — 158,476 Long-term investments: Auction rate securities — — 10,413 10,413 Asset-backed securities — 7,387 7,387 Municipal bonds — 7,258 — 7,258 Mortgage-backed securities — 156,851 — 156,851 Debt mutual fund — 53,671 — 53,671 Commercial mortgage-backed securities — 342 — 342 Total assets measured at fair value $ 354,296 $ 3,023,473 $ 10,413 $ 3,388,182 Liabilities Derivative financial instruments, net $ — $ 4,533 $ — $ 4,533 Total liabilities measured at fair value $ — $ 4,533 $ — $ 4,533 Net assets measured at fair value $ 354,296 $ 3,018,940 $ 10,413 $ 3,383,649 March 28, 2015 (In thousands) Quoted Significant Significant Total Fair Assets Cash equivalents: Money market funds $ 235,583 $ — $ — $ 235,583 Financial institution securities — 229,999 — 229,999 Non-financial institution securities — 89,995 — 89,995 U.S. government and agency securities — 200,392 — 200,392 Foreign government and agency securities — 37,996 — 37,996 Short-term investments: Financial institution securities — 75,000 — 75,000 Non-financial institution securities — 339,029 — 339,029 Municipal Bonds — 40,006 — 40,006 U.S. government and agency securities 256,514 301,010 — 557,524 Foreign government and agency securities — 159,936 — 159,936 Mortgage-backed securities — 897,776 — 897,776 Debt mutual fund — 38,608 — 38,608 Bank loans — 98,100 — 98,100 Asset-backed securities — 204,510 — 204,510 Long-term investments: Auction rate securities — — 10,312 10,312 Municipal bonds — 9,650 — 9,650 Mortgage-backed securities — 182,400 — 182,400 Debt mutual fund — 56,592 — 56,592 Asset-backed securities — 7,948 — 7,948 Total assets measured at fair value $ 492,097 $ 2,968,947 $ 10,312 $ 3,471,356 Liabilities Derivative financial instruments, net $ — $ 9,251 $ — $ 9,251 Total liabilities measured at fair value $ — $ 9,251 $ — $ 9,251 Net assets measured at fair value $ 492,097 $ 2,959,696 $ 10,312 $ 3,462,105 Changes in Level 3 Instruments Measured at Fair Value on a Recurring Basis The following table is a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3): Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Balance as of beginning of period $ 10,409 $ 20,704 $ 10,312 $ 20,160 Total realized and unrealized gains (losses): Included in other comprehensive income 4 (96 ) 101 448 Balance as of end of period $ 10,413 $ 20,608 $ 10,413 $ 20,608 As of September 26, 2015 , marketable securities measured at fair value using Level 3 inputs were comprised of $10.4 million of student loan auction rate securities. There was no material change to the input assumptions of the pricing model for these student loan auction securities. Financial Instruments Not Recorded at Fair Value on a Recurring Basis The Company’s 2.625% Senior Convertible Debentures due June 15, 2017 (2017 Convertible Notes), 2.125% Notes due 2019 (2019 Notes) and 3.000% Notes due 2021 (2021 Notes) are measured at fair value on a quarterly basis for disclosure purposes. The fair values of the 2017 Convertible Notes, 2019 Notes and 2021 Notes as of September 26, 2015 were approximately $889.8 million , $500.2 million and $506.9 million , respectively, based on the last trading price of the respective debentures for the period (classified as Level 2 in fair value hierarchy due to relatively low trading volume).

Financial Instruments

Financial Instruments	6 Months Ended
	Sep. 26, 2015
Investments, All Other Investments [Abstract]
Financial Instruments	Financial Instruments The following is a summary of cash equivalents and available-for-sale securities as of the end of the periods presented: September 26, 2015 March 28, 2015 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Money market funds $ 203,815 $ — $ — $ 203,815 $ 235,583 $ — $ — $ 235,583 Financial institution securities 300,006 — — 300,006 304,999 — — 304,999 Non-financial institution securities 471,681 82 (232 ) 471,531 429,005 25 (6 ) 429,024 Auction rate securities 10,500 — (87 ) 10,413 10,500 — (188 ) 10,312 Municipal bonds 62,776 584 (246 ) 63,114 49,064 744 (152 ) 49,656 U.S. government and agency securities 451,441 144 (7 ) 451,578 757,954 91 (129 ) 757,916 Foreign government and agency securities 201,481 — — 201,481 197,932 — — 197,932 Mortgage-backed securities 1,116,561 8,489 (4,845 ) 1,120,205 1,075,730 8,942 (4,496 ) 1,080,176 Asset-backed securities 214,120 1,251 (523 ) 214,848 211,487 1,130 (159 ) 212,458 Debt mutual funds 101,350 — (13,029 ) 88,321 101,350 — (6,150 ) 95,200 Bank loans 104,101 44 (93 ) 104,052 98,131 29 (60 ) 98,100 Commercial mortgage- backed securities 159,227 424 (833 ) 158,818 — — — — $ 3,397,059 $ 11,018 $ (19,895 ) $ 3,388,182 $ 3,471,735 $ 10,961 $ (11,340 ) $ 3,471,356 The following tables show the fair values and gross unrealized losses of the Company’s investments, aggregated by investment category, for individual securities that have been in a continuous unrealized loss position for the length of time specified, as of September 26, 2015 and March 28, 2015 : September 26, 2015 Less Than 12 Months 12 Months or Greater Total (In thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-financial institution securities $ 65,885 $ (232 ) $ — $ — $ 65,885 $ (232 ) Auction rate securities — — 10,414 (87 ) 10,414 (87 ) Municipal bonds 24,204 (107 ) 2,407 (139 ) 26,611 (246 ) U.S. government and agency securities 63,640 (7 ) — — 63,640 (7 ) Mortgage-backed securities 471,040 (3,681 ) 52,141 (1,164 ) 523,181 (4,845 ) Asset-backed securities 72,972 (479 ) 9,631 (44 ) 82,603 (523 ) Debt mutual funds 34,650 (5,350 ) 53,671 (7,679 ) 88,321 (13,029 ) Bank loans 42,444 (61 ) 28,253 (32 ) 70,697 (93 ) Commercial mortgage- backed securities 70,654 (819 ) 342 (14 ) 70,996 (833 ) $ 845,489 $ (10,736 ) $ 156,859 $ (9,159 ) $ 1,002,348 $ (19,895 ) March 28, 2015 Less Than 12 Months 12 Months or Greater Total (In thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-financial institution securities $ 7,190 $ (6 ) $ — $ — $ 7,190 $ (6 ) Auction rate securities — — 10,312 (188 ) 10,312 (188 ) Municipal bonds 10,014 (94 ) 1,931 (58 ) 11,945 (152 ) U.S. government and agency securities 451,296 (129 ) — — 451,296 (129 ) Mortgage-backed securities 448,770 (3,169 ) 49,207 (1,327 ) 497,977 (4,496 ) Asset-backed securities 75,009 (159 ) — — 75,009 (159 ) Debt mutual funds 38,608 (1,392 ) 56,592 (4,758 ) 95,200 (6,150 ) Bank loans 65,085 (60 ) — — 65,085 (60 ) $ 1,095,972 $ (5,009 ) $ 118,042 $ (6,331 ) $ 1,214,014 $ (11,340 ) As of September 26, 2015 , the gross unrealized losses that had been outstanding for less than twelve months were primarily related to mortgage-backed securities and debt mutual funds due to the general rising of the interest-rate environment and foreign currency movement. The gross unrealized losses that had been outstanding for more than twelve months were primarily related to debt mutual funds and mortgage-backed securities, which were primarily due to the same reasons stated above. The percentages of the losses to the total estimated fair value of the investments were insignificant. The Company reviewed the investment portfolio and determined that the gross unrealized losses on these investments as of September 26, 2015 and March 28, 2015 were temporary in nature as evidenced by the fluctuations in the gross unrealized losses within the investment categories. These investments are highly rated by the credit rating agencies and there have been no defaults on any of these securities, and we have received interest payments as they become due. Additionally, in the past several years a portion of the Company's investment in the mortgage-backed securities were redeemed or prepaid by the debtors at par. Furthermore, the aggregate of individual unrealized losses that had been outstanding for twelve months or more was not significant as of September 26, 2015 and March 28, 2015 . The Company neither intends to sell these investments nor concludes that it is more-likely-than-not that it will have to sell them until recovery of their carrying values. The Company also believes that it will be able to collect both principal and interest amounts due to the Company at maturity, given the high credit quality of these investments and any related underlying collateral. The amortized cost and estimated fair value of marketable debt securities (financial institution securities, non-financial institution securities, auction rate securities, municipal bonds, U.S. and foreign government and agency securities, mortgage-backed securities, asset-backed securities, bank loans and commercial mortgage-backed securities), by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties. September 26, 2015 (In thousands) Amortized Estimated Due in one year or less $ 1,263,805 $ 1,263,844 Due after one year through five years 420,118 419,993 Due after five years through ten years 292,227 292,621 Due after ten years 1,115,744 1,119,588 $ 3,091,894 $ 3,096,046 As of September 26, 2015 , $1.68 billion of marketable debt securities with contractual maturities of greater than one year were classified as short-term investments. Additionally, the above table did not include investments in money market and mutual funds because these funds do not have specific contractual maturities. Certain information related to available-for-sale securities is as follows: Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Proceeds from sale of available-for-sale securities $ 54,989 $ 236,263 $ 121,030 $ 295,844 Gross realized gains on sale of available-for-sale securities $ 476 $ 2,243 $ 836 $ 3,080 Gross realized losses on sale of available-for-sale securities (88 ) (501 ) (218 ) (668 ) Net realized gains on sale of available-for-sale securities $ 388 $ 1,742 $ 618 $ 2,412 Amortization of premiums on available-for-sale securities $ 7,043 $ 6,413 $ 13,511 $ 12,646 The cost of securities matured or sold is based on the specific identification method.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Sep. 26, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company’s primary objective for holding derivative financial instruments is to manage foreign currency exchange rate risk and interest rate risk. As a result of the use of derivative financial instruments, the Company is exposed to the risk that counterparties to derivative contracts may fail to meet their contractual obligations. The Company manages counterparty credit risk in derivative contracts by reviewing counterparty creditworthiness on a regular basis, establishing collateral requirement and limiting exposure to any single counterparty. The right of set-off that exists with certain transactions enables the Company to net amounts due to and from the counterparty, reducing the maximum loss from credit risk in the event of counterparty default. As of September 26, 2015 and March 28, 2015 , the Company had the following outstanding forward currency exchange contracts (in notional amount), which were derivative financial instruments: (In thousands and U.S. dollars) September 26, 2015 March 28, 2015 Singapore Dollar $ 30,565 $ 43,901 Euro 20,410 29,973 Indian Rupee 23,214 22,228 British Pound 11,600 12,946 Japanese Yen 3,526 4,994 $ 89,315 $ 114,042 As part of the Company’s strategy to reduce volatility of operating expenses due to foreign exchange rate fluctuations, the Company employs a hedging program with a forward outlook of up to two years for major foreign-currency-denominated operating expenses. The outstanding forward currency exchange contracts expire at various dates through November 2016 . The majority of net unrealized losses, which approximate the fair market value of the outstanding forward currency exchange contracts, are expected to be realized into net income within the next twelve months . As of September 26, 2015 , all of the forward foreign currency exchange contracts were designated and qualified as cash flow hedges and the effective portion of the gain or loss on the forward contracts was reported as a component of other comprehensive income (loss) and reclassified into net income in the same period during which the hedged transaction affects earnings. The estimated amount of such gains or losses as of September 26, 2015 that is expected to be reclassified into earnings was not material. The ineffective portion of the gains or losses on the forward contracts was included in the net income for all periods presented. The Company may enter into forward foreign currency exchange contracts to hedge firm commitments such as acquisitions and capital expenditures. Gains and losses on foreign currency forward contracts that are designated as hedges of anticipated transactions, for which a firm commitment has been attained and the hedged relationship has been effective, are deferred and included in income or expenses in the same period that the underlying transaction is settled. Gains and losses on any instruments not meeting the above criteria are recognized in income or expenses in the consolidated statements of income as they are incurred. The Company had the following derivative instruments as of September 26, 2015 and March 28, 2015 , located on the condensed consolidated balance sheet, utilized for risk management purposes detailed above: Foreign Exchange Contracts Asset Derivatives Liability Derivatives (In thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value September 26, 2015 Prepaid expenses and other current assets $ 194 Other accrued liabilities $ 4,727 March 28, 2015 Prepaid expenses and other current assets $ — Other accrued liabilities $ 9,320 The Company does not offset or net the fair value amounts of derivative financial instruments in its condensed consolidated balance sheets. The potential effect of rights of set-off associated with the derivative financial instruments was not material to the Company's condensed consolidated balance sheet for all periods presented. The following table summarizes the effect of derivative instruments on the condensed consolidated statements of income for the second quarter and the first six months of fiscal 2016 and 2015 : Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Amount of gains (losses) recognized in other comprehensive income on derivative (effective portion of cash flow hedging) $ 426 $ (3,838 ) $ (3,564 ) $ (4,123 ) Amount of gains (losses) reclassified from accumulated other comprehensive income into income (effective portion) * $ (2,071 ) $ 211 $ (3,944 ) $ 1,018 Amount of gains (losses) recorded (ineffective portion) * $ 7 $ (43 ) $ (22 ) $ (13 ) * Recorded in Interest and Other Expense location within the condensed consolidated statements of income.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	6 Months Ended
	Sep. 26, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans The Company’s equity incentive plans are broad-based, long-term retention programs that cover employees, consultants and non-employee directors of the Company. These plans are intended to attract and retain talented employees, consultants and non-employee directors and to provide such persons with a proprietary interest in the Company. Stock-Based Compensation The following table summarizes stock-based compensation expense related to stock awards granted under the Company’s equity incentive plans and rights to acquire stock granted under the Company’s Employee Stock Purchase Plan (ESPP): Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Stock-based compensation included in: Cost of revenues $ 1,763 $ 2,077 $ 3,727 $ 4,069 Research and development 12,934 14,831 27,626 25,336 Selling, general and administrative 11,984 11,832 21,648 21,441 $ 26,681 $ 28,740 $ 53,001 $ 50,846 During the first six months of fiscal 2016 and 2015 , the tax benefits realized for the tax deduction from option exercises and other awards credited to additional paid-in capital were $7.3 million and $9.9 million , respectively. Employee Stock Option Plans A summary of the Company’s option plans activity and related information is as follows: Options Outstanding (Shares in thousands) Number of Shares Weighted-Average Exercise Price Per Share March 29, 2014 5,280 $ 25.22 Exercised (2,009 ) $ 25.80 Forfeited/cancelled/expired (24 ) $ 32.22 March 28, 2015 3,247 $ 24.81 Exercised (1,159 ) $ 24.64 Forfeited/cancelled/expired (12 ) $ 31.99 September 26, 2015 2,076 $ 24.86 Options exercisable at: September 26, 2015 2,039 $ 24.69 March 28, 2015 3,173 $ 24.59 The types of awards allowed under the 2007 Equity Incentive Plan (2007 Equity Plan) include incentive stock options, non-qualified stock options, restricted stock unit (RSU) awards, restricted stock and stock appreciation rights. To date, the Company has issued a mix of non-qualified stock options and RSUs under the 2007 Equity Plan. As of September 26, 2015 , 13.0 million shares remained available for grant under the 2007 Equity Plan. The total pre-tax intrinsic value of options exercised during the three and six months ended September 26, 2015 was $7.5 million and $23.3 million , respectively. The total pre-tax intrinsic value of options exercised during the three and six months ended September 27, 2014 was $4.8 million and $15.9 million , respectively. This intrinsic value represents the difference between the exercise price and the fair market value of the Company’s common stock on the date of exercise. The Company's stock-based compensation expense relating to options during the first six months of fiscal 2016 and 2015 was not material. RSU Awards A summary of the Company’s RSU activity and related information is as follows: RSUs Outstanding (Shares in thousands) Number of Shares Weighted-Average Grant-Date Fair Value Per Share March 29, 2014 6,901 $ 35.08 Granted 3,201 $ 43.11 Vested (2,698 ) $ 33.82 Cancelled (531 ) $ 32.91 March 28, 2015 6,873 $ 39.07 Granted 2,754 $ 41.13 Vested (2,178 ) $ 37.18 Cancelled (399 ) $ 39.63 September 26, 2015 7,050 $ 40.42 The estimated fair values of RSU awards were calculated based on the market price of Xilinx common stock on the date of grant, reduced by the present value of dividends expected to be paid on Xilinx common stock prior to vesting. The per share weighted-average fair value of RSUs granted during the second quarter of fiscal 2016 was $41.07 ( $44.40 for the second quarter of fiscal 2015 ), and for the first six months of fiscal 2016 was $41.13 ( $43.84 for the first six months of fiscal 2015 ), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: Three Months Ended Six Months Ended September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Risk-free interest rate 1.3 % 0.7 % 1.3 % 0.7 % Dividend yield 2.8 % 2.4 % 2.8 % 2.4 % For the majority of RSUs granted, the number of shares of common stock issued on the date the RSU awards vest is net of the minimum statutory withholding requirements that we pay in cash to the appropriate taxing authorities on behalf of our employees. In the condensed consolidated statement of cash flows, these amounts have been included as a reduction in the cash proceeds from issuance of common stock under our various stock plans. During the first six months of fiscal 2016 and 2015 , we withheld $28.6 million and $31.7 million worth of RSU awards, respectively, to satisfy the employees’ tax obligations. Employee Stock Purchase Plan Under the ESPP, shares are only issued during the second and fourth quarters of each fiscal year. Employees purchased 438 thousand shares for $14.5 million during the second quarter of fiscal 2016 and 446 thousand shares for $14.9 million in the second quarter of fiscal 2015 . The per-share weighted-average fair value of stock purchase rights granted under the ESPP during the second quarter of fiscal 2016 and 2015 was $9.78 and $9.75 , respectively. The fair values of stock purchase plan rights granted in the second quarter of fiscal 2016 and 2015 were estimated using the Black-Scholes option pricing model at the date of grant using the following assumptions: 2016 2015 Expected life of options (years) 1.25 1.25 Expected stock price volatility 0.25 0.25 Risk-free interest rate 0.4 % 0.2 % Dividend yield 3.0 % 2.8 % The next scheduled purchase under the ESPP is in the fourth quarter of fiscal 2016. As of September 26, 2015 , 10.1 million shares were available for future issuance under the ESPP.

Net Income Per Common Share

Net Income Per Common Share	6 Months Ended
	Sep. 26, 2015
Earnings Per Share [Abstract]
Net Income Per Common Share	Net Income Per Common Share The computation of basic net income per common share for all periods presented is derived from the information on the condensed consolidated statements of income, and there are no reconciling items in the numerator used to compute diluted net income per common share. The following table summarizes the computation of basic and diluted net income per common share: Three Months Ended Six Months Ended (In thousands, except per share amounts) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Net income available to common stockholders $ 127,298 $ 171,516 $ 275,013 $ 345,127 Weighted average common shares outstanding-basic 257,640 265,942 257,744 267,098 Dilutive effect of employee equity incentive plans 1,920 3,155 2,423 3,653 Dilutive effect of 2017 Convertible Notes and warrants 6,486 6,703 7,903 8,033 Weighted average common shares outstanding-diluted 266,046 275,800 268,070 278,784 Basic earnings per common share $ 0.49 $ 0.64 $ 1.07 $ 1.29 Diluted earnings per common share $ 0.48 $ 0.62 $ 1.03 $ 1.24 The total shares used in the denominator of the diluted net income per common share calculation includes potentially dilutive common equivalent shares outstanding that are not included in basic net income per common share by applying the treasury stock method to the impact of the equity incentive plans and to the incremental shares issuable assuming conversion of the Company's convertible debt and warrants (see "Note 10. Debt and Credit Facility" for more discussion of the Company's debt and warrants). Outstanding stock options and RSUs under the Company's stock award plans to purchase approximately 1.7 million and 3.0 million shares, for the second quarter and the first six months of fiscal 2016 , respectively, were excluded from diluted net income per common share by applying the treasury stock method, as their inclusion would have been anti-dilutive. These options and RSUs could be dilutive in the future if the Company’s average share price increases and is greater than the combined exercise prices and the unamortized fair values of these options and RSUs. To hedge against potential dilution upon conversion of the 2017 Convertible Notes, the Company also purchased call options on its common stock from the hedge counter-parties. The call options give the Company the right to purchase up to 20.5 million shares of its common stock at $29.26 per share. These call options are not considered for purposes of calculating the total shares outstanding under the basic and diluted net income per share, as their effect would be anti-dilutive. Upon exercise, the call options would serve to neutralize the dilutive effect of the 2017 Convertible Notes and potentially reduce the weighted number of diluted shares used in per share calculations.

Inventories

Inventories	6 Months Ended
	Sep. 26, 2015
Inventory Disclosure [Abstract]
Inventory Disclosure [Text Block]	Inventories Inventories are stated at the lower of actual cost (determined using the first-in, first-out method), or market (estimated NRV) and are comprised of the following: (In thousands) September 26, 2015 March 28, 2015 Raw materials $ 12,014 $ 14,174 Work-in-process 163,090 183,472 Finished goods 37,869 33,682 $ 212,973 $ 231,328

Debt and Credit Facility

Debt and Credit Facility	6 Months Ended
	Sep. 26, 2015
Debt Disclosure [Abstract]
Debt and Credit Facility [Text Block]	Debt and Credit Facility 2017 Convertible Notes As of September 26, 2015 , the Company had $600.0 million principal amount of 2017 Convertible Notes outstanding. The 2017 Convertible Notes are senior in right of payment to the Company’s existing and future unsecured indebtedness that is expressly subordinated in right of payment to the 2017 Convertible Notes, and are ranked equally with all of our other existing and future unsecured senior indebtedness, including the 2019 and 2021 Notes discussed below. The Company may not redeem the 2017 Convertible Notes prior to maturity. The 2017 Convertible Notes are convertible, subject to certain conditions, into shares of Xilinx common stock at a conversion rate of 34.1754 shares of common stock per $1 thousand principal amount of the 2017 Convertible Notes, representing an effective conversion price of approximately $29.26 per share of common stock. The conversion rate is subject to adjustment for certain events as outlined in the indenture governing the 2017 Convertible Notes, but will not be adjusted for accrued interest. One of the conditions allowing holders of the 2017 Convertible Notes to convert during any fiscal quarter is if the last reported sale price of the Company's common stock for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the preceding fiscal quarter is greater than or equal to 130% of the conversion price on each applicable trading day. This condition was met as of September 26, 2015 and as a result, the 2017 Convertible Notes were convertible at the option of the holders. As of September 26, 2015 , the 2017 Convertible Notes were classified as a current liability on the Company's condensed consolidated balance sheet. Additionally, a portion of the equity component attributable to the conversion feature of the 2017 Convertible Notes was classified in temporary stockholders' equity. The amount classified as temporary equity was equal to the difference between the principal amount and carrying value of the 2017 Convertible Notes. Upon conversion, the Company would pay the holders of the 2017 Convertible Notes cash up to the aggregate principal amount of the 2017 Convertible Notes. If the conversion value exceeds the principal amount, the Company would deliver shares of its common stock in respect to the remainder of its conversion obligation in excess of the aggregate principal amount (conversion spread). Accordingly, there is no adjustment to the numerator in the net income per common share computation for the cash settled portion of the 2017 Convertible Notes, as that portion of the debt liability will always be settled in cash. The conversion spread is included in the denominator for the computation of diluted net income per common share, using the treasury stock method. The carrying values of the liability and equity components of the 2017 Convertible Notes are reflected in the Company’s condensed consolidated balance sheets as follows: (In thousands) September 26, 2015 March 28, 2015 Liability component: Principal amount of the 2017 Convertible Notes $ 600,000 $ 600,000 Unamortized discount of liability component (25,907 ) (33,679 ) Hedge accounting adjustment – sale of interest rate swap 7,487 9,732 Net carrying value of the 2017 Convertible Notes $ 581,580 $ 576,053 Equity component (including temporary equity) – net carrying value $ 66,415 $ 66,415 The remaining unamortized debt discount, net of the hedge accounting adjustment from the previous sale of the interest rate swap, is being amortized as additional non-cash interest expense over the expected remaining term of the 2017 Convertible Notes. As of September 26, 2015 , the remaining term of the 2017 Convertible Notes is 1.7 years. As of September 26, 2015 , the if-converted value of the 2017 Convertible Notes was $859.1 million . Interest expense related to the 2017 Convertible Notes was included in interest and other expense, net on the condensed consolidated statements of income as follows: Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Contractual coupon interest $ 3,938 $ 3,938 $ 7,875 $ 7,875 Amortization of debt issuance costs 362 362 724 724 Amortization of debt discount, net 2,763 2,763 5,526 5,526 Total interest expense related to the 2017 Convertible Notes $ 7,063 $ 7,063 $ 14,125 $ 14,125 To hedge against potential dilution upon conversion of the 2017 Convertible Notes, the Company purchased call options on its common stock from the hedge counter parties. The call options give the Company the right to purchase up to 20.5 million shares of its common stock at $29.26 per share. The call options will terminate upon the earlier of the maturity of the 2017 Convertible Notes or the last day any of the 2017 Convertible Notes remain outstanding. To reduce the hedging cost, under separate transactions the Company sold warrants to the hedge counter parties, which give the hedge counter parties the right to purchase up to 20.5 million shares of the Company’s common stock at $41.45 per share. These warrants expire on a gradual basis over a specified period starting on September 13, 2017. 2019 and 2021 Notes On March 12, 2014, the Company issued $500.0 million principal amount of 2019 Notes and $500.0 million principal amount of 2021 Notes with maturity dates of March 15, 2019 and March 15, 2021 respectively. The 2019 and 2021 Notes were offered to the public at a discounted price of 99.477% and 99.281% of par, respectively. Interest on the 2019 and 2021 Notes is payable semiannually on March 15 and September 15. The Company received net proceeds of $990.1 million from issuance of the 2019 and 2021 Notes, after the debt discounts and deduction of debt issuance costs. The debt discounts and issuance costs are amortized to interest expense over the terms of the 2019 and 2021 Notes. The following table summarizes the carrying value of the 2019 and 2021 Notes as of September 26, 2015 and March 28, 2015 : (In thousands) September 26, 2015 March 28, 2015 Principal amount of the 2019 Notes $ 500,000 $ 500,000 Unamortized discount of the 2019 Notes (1,818 ) (2,073 ) Principal amount of the 2021 Notes 500,000 500,000 Unamortized discount of the 2021 Notes (2,849 ) (3,088 ) Total carrying value $ 995,333 $ 994,839 Interest expense related to the 2019 and 2021 Notes was included in interest and other expense, net on the condensed consolidated statements of income as follows: Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Contractual coupon interest $ 6,406 $ 6,406 $ 12,813 $ 12,813 Amortization of debt issuance costs 146 134 293 290 Amortization of debt discount, net 247 242 493 482 Total interest expense related to the 2019 and 2021 Notes $ 6,799 $ 6,782 $ 13,599 $ 13,585 Revolving Credit Facility On December 7, 2011 , the Company entered into a $250.0 million senior unsecured revolving credit facility with a syndicate of banks (expiring in December 2016 ). Borrowings under the credit facility will bear interest at a benchmark rate plus an applicable margin based upon the Company’s credit rating. In connection with the credit facility, the Company is required to maintain certain financial and nonfinancial covenants. As of September 26, 2015 , the Company had made no borrowings under this credit facility and was not in violation of any of the covenants.

Common Stock Repurchase Program

Common Stock Repurchase Program	6 Months Ended
	Sep. 26, 2015
Common Stock Repurchase Program [Abstract]
Common Stock and Debentures Repurchase Program [Text Block]	Common Stock Repurchase Program The Board of Directors has approved stock repurchase programs enabling the Company to repurchase its common stock in the open market or through negotiated transactions with independent financial institutions. In November 2014, the Board authorized the repurchase of $800.0 million of the Company's common stock (2014 Repurchase Program). The 2014 Repurchase Program has no stated expiration date. Through September 26, 2015 , the Company had used $352.6 million of the $800.0 million authorized under the 2014 Repurchase Program, leaving $447.4 million available for future repurchases. The Company’s current policy is to retire all repurchased shares, and consequently, no treasury shares were held as of September 26, 2015 and March 28, 2015 . During the first six months of fiscal 2016 , the Company repurchased 4.6 million shares of common stock in the open market for a total of $200.0 million . During the first six months of fiscal 2015, the Company repurchased 7.0 million shares of common stock in the open market for a total of $300.0 million .

Interest and Other Expense, Net

Interest and Other Expense, Net	6 Months Ended
	Sep. 26, 2015
Other Income and Expenses [Abstract]
Interest and Other Expense, Net	Interest and Other Expense, Net The components of interest and other expense, net are as follows: Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Interest income $ 8,124 $ 8,392 $ 16,099 $ 16,893 Interest expense (13,862 ) (13,845 ) (27,724 ) (27,710 ) Other expense, net (3,475 ) (278 ) (8,115 ) (1,136 ) $ (9,213 ) $ (5,731 ) $ (19,740 ) $ (11,953 )

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Sep. 26, 2015
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Loss Comprehensive income (loss) is defined as the change in equity of a company during a period from transactions and other events and circumstances from non-owner sources. The components of accumulated other comprehensive loss are as follows: (In thousands) September 26, 2015 March 28, 2015 Accumulated unrealized losses on available-for-sale securities, net of tax $ (5,614 ) $ (238 ) Accumulated unrealized losses on hedging transactions, net of tax (3,957 ) (7,523 ) Accumulated cumulative translation adjustment, net of tax (4,935 ) (3,388 ) Accumulated other comprehensive loss $ (14,506 ) $ (11,149 ) The related tax effects of other comprehensive loss were not material for all periods presented.

Income Taxes

Income Taxes	6 Months Ended
	Sep. 26, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded tax provisions of $16.7 million and $36.9 million for the second quarter and the first six months of fiscal 2016 , respectively, representing an effective tax rate of 12% for both periods. The Company recorded tax provisions of $22.8 million and $49.5 million for the second quarter and the first six months of fiscal 2015 , respectively, representing effective tax rates of 12% and 13% , respectively. The difference between the U.S. federal statutory tax rate of 35% and the Company’s effective tax rate in all periods is primarily due to income earned in lower tax rate jurisdictions, for which no U.S. income tax has been provided, as the Company intends to permanently reinvest these earnings outside of the U.S. The Company’s total gross unrecognized tax benefits as of September 26, 2015 , determined in accordance with FASB authoritative guidance for measuring uncertain tax positions, were $30.0 million . The total amount of unrecognized tax benefits that, if realized in a future period, would favorably affect the effective tax rate was $12.4 million as of September 26, 2015 . It is reasonably possible that changes to our unrecognized tax benefits could be significant in the next twelve months due to tax audit settlements and lapses of statutes of limitation. As a result of uncertainties regarding tax audit settlements and their possible outcomes, an estimate of the range of increase or decrease that could occur in the next twelve months cannot be made. The Company’s policy is to include interest and penalties related to income tax liabilities within the provision for income taxes on the condensed consolidated statements of income. The balance of accrued interest and penalties recorded in the condensed consolidated balance sheets and the amounts of interest and penalties included in the Company's provision for income taxes were not material for all periods presented. The Company is no longer subject to U.S. federal audits by taxing authorities for years through fiscal 2011. The Company is no longer subject to U.S. state audits for years through fiscal 2009. The Company is no longer subject to tax audits in Ireland for years through fiscal 2010. The Company is currently under examination by the IRS for fiscal years 2012 through 2014. The Company believes that its allowances for income tax contingencies are adequate and does not anticipate a significant change in its income tax contingencies as a result of the IRS audit.

Commitments

Commitments	6 Months Ended
	Sep. 26, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments Xilinx leases some of its facilities and office buildings under non-cancelable operating leases that expire at various dates through October 2021 . Additionally, Xilinx entered into a land lease in conjunction with the Company’s building in Singapore, which will expire in November 2035 and the lease cost was settled in an up-front payment in June 2006. Some of the operating leases for facilities and office buildings require payment of operating costs, including property taxes, repairs, maintenance and insurance. Most of the Company’s leases contain renewal options for varying terms. Approximate future minimum lease payments under non-cancelable operating leases are as follows: Fiscal (In thousands) 2016 (remaining six months) $ 2,486 2017 3,972 2018 2,792 2019 2,474 2020 1,657 Thereafter 2,145 Total $ 15,526 Aggregate future rental income to be received, which includes rents from both owned and leased property, totaled $3.0 million as of September 26, 2015 . Rent expense, net of rental income, under all operating leases was $1.3 million and $2.1 million for the three and six months ended September 26, 2015 , respectively. Rent expense, net of rental income, under all operating leases was $697 thousand and $1.5 million for the three and six months ended September 27, 2014 , respectively. Rental income was not material for the second quarter and the first six months of fiscal 2016 and 2015 . Other commitments as of September 26, 2015 totaled $97.2 million and consisted of purchases of inventory and other non-cancelable purchase obligations related to subcontractors that manufacture silicon wafers and provide assembly and test services. The Company expects to receive and pay for these materials and services in the next three to six months, as the products meet delivery and quality specifications. As of September 26, 2015 , the Company also had $21.4 million of non-cancelable license obligations to providers of electronic design automation software and hardware/software maintenance expiring at various dates through June 2017 .

Product Warranty and Indemnific

Product Warranty and Indemnification	6 Months Ended
	Sep. 26, 2015
Product Warranties Disclosures [Abstract]
Product Warranty Disclosure [Text Block]	Product Warranty and Indemnification The Company generally sells products with a limited warranty for product quality. The Company provides an accrual for known product issues if a loss is probable and can be reasonably estimated. As of the end of the second quarter of fiscal 2016 and the end of fiscal 2015 , the accrual balance of the product warranty liability was immaterial. The Company offers, subject to certain terms and conditions, to indemnify customers and distributors for costs and damages awarded against these parties in the event the Company’s hardware products are found to infringe third-party intellectual property rights, including patents, copyrights or trademarks, and to compensate certain customers for limited specified costs they actually incur in the event our hardware products experience epidemic failure. To a lesser extent, the Company may from time-to-time offer limited indemnification with respect to its software products. The terms and conditions of these indemnity obligations are limited by contract, which obligations are typically perpetual from the effective date of the agreement. The Company has historically received only a limited number of requests for indemnification under these provisions and has not made any significant payments pursuant to these provisions. The Company cannot estimate the maximum amount of potential future payments, if any, that the Company may be required to make as a result of these obligations due to the limited history of indemnification claims and the unique facts and circumstances that are likely to be involved in each particular claim and indemnification provision. However, there can be no assurances that the Company will not incur any financial liabilities in the future as a result of these obligations.

Contingencies

Contingencies	6 Months Ended
	Sep. 26, 2015
Loss Contingency [Abstract]
Contingencies	Contingencies Patent Litigation On November 7, 2014, the Company filed a complaint for declaratory judgment against Papst Licensing GmbH & Co., KG (Papst) in the U.S. District Court for the Northern District of California (Xilinx, Inc. v. Papst Licensing GmbH & Co., KG, Case No. 3:14-CV-04963) (the California Action). On the same date, a patent infringement lawsuit was filed by Papst against the Company in the U.S. District Court for the District of Delaware (Papst Licensing GmbH & Co., KG v. Xilinx, Inc., Case No. 1:14-CV-01376) (the Delaware Action). Both the California Action and the Delaware Action pertain to the same two patents. In the Delaware Action, Papst seeks unspecified damages, interest and costs. On July 9, 2015, the Court in the California Action granted Papst’s motion to dismiss for lack of personal jurisdiction and the California Action was dismissed. The Company has filed notice that it intends to appeal the dismissal of the California Action to the U.S. Court of Appeals for the Federal Circuit. On September 1, 2015, the Court in the Delaware Action granted the Company’s motion to transfer the Delaware Action to the U.S. District Court for the Northern District of California. Papst has filed an objection to that order. The Company is unable to estimate its range of possible loss, if any, in this matter at this time. On July 17, 2014, a patent infringement lawsuit was filed by PLL Technologies, Inc. (PTI) against the Company in the U.S. District Court for the District of Delaware (PLL Technologies, Inc. v. Xilinx, Inc., Case No. 1:14-CV-00945). On April 28, 2015, the United States Patent Trial and Appeal Board granted Xilinx’s request for inter partes review (IPR) with respect to all claims in the litigation. On May 5, 2015, the Court ordered the litigation be stayed pending final resolution of the IPR. The lawsuit pertains to one patent and PTI seeks unspecified damages, interest and costs. The Company is unable to estimate its range of possible loss, if any, in this matter at this time. On May 22, 2015, a patent infringement lawsuit was filed by QuickCompile IP, LLC (QuickCompile) against the Company in the U.S. District Court for the Eastern District of Texas (QuickCompile IP, LLC v. Xilinx, Inc., Case No. 2:15-CV-00820). The lawsuit pertains to two patents and QuickCompile seeks unspecified damages, interest and costs. The Company is unable to estimate its range of possible loss, if any, in this matter at this time. The Company intends to continue to protect and defend our Intellectual Property (IP) vigorously. Other Matters On January 31, 2014, Evan Levine and Keith McClellan filed an action on behalf of the United States in the United States District Court for the Eastern District of Kentucky (United States of America, ex. rel. Evan Levine and Keith McClellan v. Avnet Inc., et. al., Case No. 14-cv-00017). The matter alleges violations of the False Claims Act, 31 U.S.C. Section 3729 et seq. and was filed under seal pursuant to 31 U.S.C. Section 3730(b)(2). The lawsuit seeks to recover, on behalf of the United States, $11 thousand for each unspecified, allegedly false and fraudulent claim, plus treble damages. The government investigated the allegations in the complaint and on September 12, 2014, filed a Notice of Election to Decline Intervention. On September 22, 2014, the District Court unsealed the complaint and ordered it to be served on the defendants. On November 21, 2014, the government moved to dismiss the complaint with prejudice. That same day, Mr. McClellan filed a notice of dismissal, leaving Mr. Levine as the only remaining relator. The Company was served with the complaint on December 11, 2014. On April 1, 2015, the District Court granted the government’s motion, dismissing the matter with prejudice. The District Court also entered judgment in favor of the defendants including the Company. On April 27, 2015, Mr. Levine, proceeding without counsel, filed a notice of appeal to the United States Court of Appeals for the Sixth Circuit from the District Court's order and judgment. On August 7, 2015, the Court of Appeals for the Sixth Circuit dismissed the appeal for lack of prosecution. Based on currently available information, the Company does not believe the resolution of this matter will have a material adverse effect on its business, financial position or future results of operations. On June 11, 2015, John P. Neblett as Chapter 7 Trustee of Valley Forge Composite Technologies, Inc. filed a complaint against Xilinx and others in the U.S. Bankruptcy Court for the Middle District of Pennsylvania (Bankruptcy No. 1:13-bk-05253-JJT). The complaint alleges causes of actions against Xilinx for negligence and civil conspiracy relating to alleged violations of U.S. export laws. It seeks at least $50.0 million in damages, together with punitive damages, from the defendants. On September 21, 2015, the action was withdrawn from the U.S. Bankruptcy Court for the Middle District of Pennsylvania and transferred to the U.S. District Court for the Eastern District of Kentucky. The Company is unable to estimate its range of possible loss, if any, in this matter at this time. From time to time, the Company is involved in various disputes and litigation matters that arise in the ordinary course of its business. These include disputes and lawsuits related to intellectual property, mergers and acquisitions, licensing, contract law, tax, regulatory, distribution arrangements, employee relations and other matters. Periodically, the Company reviews the status of each matter and assesses its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and a range of possible losses can be estimated, the Company accrues a liability for the estimated loss. Legal proceedings are subject to uncertainties, and the outcomes are difficult to predict. Because of such uncertainties, accruals are based only on the best information available at the time. As additional information becomes available, the Company continues to reassess the potential liability related to pending claims and litigation and may revise estimates.

Goodwill and Acquisition-Relate

Goodwill and Acquisition-Related Intangibles	6 Months Ended
	Sep. 26, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquisition-Related Intangibles	Goodwill and Acquisition-Related Intangibles As of September 26, 2015 and March 28, 2015 , the gross and net amounts of goodwill and of acquisition-related intangibles for all acquisitions were as follows: Weighted-Average (In thousands) September 26, 2015 March 28, 2015 Amortization Life Goodwill $ 159,296 $ 159,296 Core technology, gross 77,640 77,640 5.6 years Less accumulated amortization (68,493 ) (64,988 ) Core technology, net 9,147 12,652 Other intangibles, gross 46,606 46,606 2.7 years Less accumulated amortization (46,539 ) (46,506 ) Other intangibles, net 67 100 Total acquisition-related intangibles, gross 124,246 124,246 Less accumulated amortization (115,032 ) (111,494 ) Total acquisition-related intangibles, net $ 9,214 $ 12,752 Amortization expense for acquisition-related intangibles for the three and six months ended September 26, 2015 was $1.8 million and $3.5 million , respectively. Based on the carrying value of acquisition-related intangibles recorded as of September 26, 2015 , and assuming no subsequent impairment of the underlying assets, the annual amortization expense for acquisition-related intangibles is expected to be as follows: Fiscal (In thousands) 2016 (remaining six months) $ 3,012 2017 4,761 2018 1,374 2019 67 Total $ 9,214

Subsequent Events (Notes)

Subsequent Events (Notes)	6 Months Ended
	Sep. 26, 2015
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On October 6, 2015 , the Company’s Board of Directors declared a cash dividend of $0.31 per common share for the third quarter of fiscal 2016 . The dividend is payable on November 24, 2015 to stockholders of record on November 5, 2015 .

Restructuring Charges (Notes)

Restructuring Charges (Notes)	6 Months Ended
	Sep. 26, 2015
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	Restructuring Charges During the fourth quarter of fiscal 2015, the Company announced restructuring measures designed to realign resources and drive overall operating efficiencies. These measures impacted approximately 120 positions, or 3% of the Company's global workforce, in various geographies and functions worldwide. The reorganization plan was substantially completed by the end of the first quarter of fiscal 2016. The Company recorded total restructuring charges of $24.5 million in the fourth quarter of fiscal 2015, primarily related to severance pay expenses and write-offs of acquisition-related intangibles. As of the end of the second quarter of fiscal 2016, the balance of the restructuring accrual was $3.0 million , which is expected to be paid within the next few quarters.

Derivative Financial Instrume27

Derivative Financial Instruments Derivative Financial Instruments (Policies)	6 Months Ended
	Sep. 26, 2015
Accounting Policies [Abstract]
Derivatives, Policy [Policy Text Block]	Gains and losses on foreign currency forward contracts that are designated as hedges of anticipated transactions, for which a firm commitment has been attained and the hedged relationship has been effective, are deferred and included in income or expenses in the same period that the underlying transaction is settled. Gains and losses on any instruments not meeting the above criteria are recognized in income or expenses in the consolidated statements of income as they are incurred.

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Policies)	6 Months Ended
	Sep. 26, 2015
Accounting Policies [Abstract]
Share based compensation, Restricted Stock and Restricted Stock Units Policy [Policy Text Block]	The estimated fair values of RSU awards were calculated based on the market price of Xilinx common stock on the date of grant, reduced by the present value of dividends expected to be paid on Xilinx common stock prior to vesting.

Inventories Inventories (Polici

Inventories Inventories (Policies)	6 Months Ended
	Sep. 26, 2015
Inventory Disclosure [Abstract]
Inventory, Policy [Policy Text Block]	Inventories are stated at the lower of actual cost (determined using the first-in, first-out method), or market (estimated NRV)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Sep. 26, 2015
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value on a recurring basis	The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis as of September 26, 2015 and March 28, 2015 : September 26, 2015 (In thousands) Quoted Significant Significant Total Fair Assets Cash equivalents: Money market funds $ 203,815 $ — $ — $ 203,815 Financial institution securities — 75,006 — 75,006 Non-financial institution securities — 257,342 — 257,342 U.S. government and agency securities — 5,000 — 5,000 Foreign government and agency securities — 75,924 — 75,924 Short-term investments: Financial institution securities — 225,000 — 225,000 Non-financial institution securities — 214,189 — 214,189 Municipal bonds — 55,856 — 55,856 U.S. government and agency securities 150,481 296,097 — 446,578 Foreign government and agency securities — 125,557 — 125,557 Asset-backed securities — 207,461 — 207,461 Mortgage-backed securities — 963,354 — 963,354 Debt mutual funds — 34,650 — 34,650 Bank loans — 104,052 — 104,052 Commercial mortgage-backed securities — 158,476 — 158,476 Long-term investments: Auction rate securities — — 10,413 10,413 Asset-backed securities — 7,387 7,387 Municipal bonds — 7,258 — 7,258 Mortgage-backed securities — 156,851 — 156,851 Debt mutual fund — 53,671 — 53,671 Commercial mortgage-backed securities — 342 — 342 Total assets measured at fair value $ 354,296 $ 3,023,473 $ 10,413 $ 3,388,182 Liabilities Derivative financial instruments, net $ — $ 4,533 $ — $ 4,533 Total liabilities measured at fair value $ — $ 4,533 $ — $ 4,533 Net assets measured at fair value $ 354,296 $ 3,018,940 $ 10,413 $ 3,383,649 March 28, 2015 (In thousands) Quoted Significant Significant Total Fair Assets Cash equivalents: Money market funds $ 235,583 $ — $ — $ 235,583 Financial institution securities — 229,999 — 229,999 Non-financial institution securities — 89,995 — 89,995 U.S. government and agency securities — 200,392 — 200,392 Foreign government and agency securities — 37,996 — 37,996 Short-term investments: Financial institution securities — 75,000 — 75,000 Non-financial institution securities — 339,029 — 339,029 Municipal Bonds — 40,006 — 40,006 U.S. government and agency securities 256,514 301,010 — 557,524 Foreign government and agency securities — 159,936 — 159,936 Mortgage-backed securities — 897,776 — 897,776 Debt mutual fund — 38,608 — 38,608 Bank loans — 98,100 — 98,100 Asset-backed securities — 204,510 — 204,510 Long-term investments: Auction rate securities — — 10,312 10,312 Municipal bonds — 9,650 — 9,650 Mortgage-backed securities — 182,400 — 182,400 Debt mutual fund — 56,592 — 56,592 Asset-backed securities — 7,948 — 7,948 Total assets measured at fair value $ 492,097 $ 2,968,947 $ 10,312 $ 3,471,356 Liabilities Derivative financial instruments, net $ — $ 9,251 $ — $ 9,251 Total liabilities measured at fair value $ — $ 9,251 $ — $ 9,251 Net assets measured at fair value $ 492,097 $ 2,959,696 $ 10,312 $ 3,462,105
Changes in Level 3 instruments measured at fair value on a recurring basis	The following table is a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3): Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Balance as of beginning of period $ 10,409 $ 20,704 $ 10,312 $ 20,160 Total realized and unrealized gains (losses): Included in other comprehensive income 4 (96 ) 101 448 Balance as of end of period $ 10,413 $ 20,608 $ 10,413 $ 20,608

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Sep. 26, 2015
Investments, All Other Investments [Abstract]
Available-for-sale securities	The following is a summary of cash equivalents and available-for-sale securities as of the end of the periods presented: September 26, 2015 March 28, 2015 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Money market funds $ 203,815 $ — $ — $ 203,815 $ 235,583 $ — $ — $ 235,583 Financial institution securities 300,006 — — 300,006 304,999 — — 304,999 Non-financial institution securities 471,681 82 (232 ) 471,531 429,005 25 (6 ) 429,024 Auction rate securities 10,500 — (87 ) 10,413 10,500 — (188 ) 10,312 Municipal bonds 62,776 584 (246 ) 63,114 49,064 744 (152 ) 49,656 U.S. government and agency securities 451,441 144 (7 ) 451,578 757,954 91 (129 ) 757,916 Foreign government and agency securities 201,481 — — 201,481 197,932 — — 197,932 Mortgage-backed securities 1,116,561 8,489 (4,845 ) 1,120,205 1,075,730 8,942 (4,496 ) 1,080,176 Asset-backed securities 214,120 1,251 (523 ) 214,848 211,487 1,130 (159 ) 212,458 Debt mutual funds 101,350 — (13,029 ) 88,321 101,350 — (6,150 ) 95,200 Bank loans 104,101 44 (93 ) 104,052 98,131 29 (60 ) 98,100 Commercial mortgage- backed securities 159,227 424 (833 ) 158,818 — — — — $ 3,397,059 $ 11,018 $ (19,895 ) $ 3,388,182 $ 3,471,735 $ 10,961 $ (11,340 ) $ 3,471,356
Fair values and gross unrealized losses of the investments	The following tables show the fair values and gross unrealized losses of the Company’s investments, aggregated by investment category, for individual securities that have been in a continuous unrealized loss position for the length of time specified, as of September 26, 2015 and March 28, 2015 : September 26, 2015 Less Than 12 Months 12 Months or Greater Total (In thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-financial institution securities $ 65,885 $ (232 ) $ — $ — $ 65,885 $ (232 ) Auction rate securities — — 10,414 (87 ) 10,414 (87 ) Municipal bonds 24,204 (107 ) 2,407 (139 ) 26,611 (246 ) U.S. government and agency securities 63,640 (7 ) — — 63,640 (7 ) Mortgage-backed securities 471,040 (3,681 ) 52,141 (1,164 ) 523,181 (4,845 ) Asset-backed securities 72,972 (479 ) 9,631 (44 ) 82,603 (523 ) Debt mutual funds 34,650 (5,350 ) 53,671 (7,679 ) 88,321 (13,029 ) Bank loans 42,444 (61 ) 28,253 (32 ) 70,697 (93 ) Commercial mortgage- backed securities 70,654 (819 ) 342 (14 ) 70,996 (833 ) $ 845,489 $ (10,736 ) $ 156,859 $ (9,159 ) $ 1,002,348 $ (19,895 ) March 28, 2015 Less Than 12 Months 12 Months or Greater Total (In thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-financial institution securities $ 7,190 $ (6 ) $ — $ — $ 7,190 $ (6 ) Auction rate securities — — 10,312 (188 ) 10,312 (188 ) Municipal bonds 10,014 (94 ) 1,931 (58 ) 11,945 (152 ) U.S. government and agency securities 451,296 (129 ) — — 451,296 (129 ) Mortgage-backed securities 448,770 (3,169 ) 49,207 (1,327 ) 497,977 (4,496 ) Asset-backed securities 75,009 (159 ) — — 75,009 (159 ) Debt mutual funds 38,608 (1,392 ) 56,592 (4,758 ) 95,200 (6,150 ) Bank loans 65,085 (60 ) — — 65,085 (60 ) $ 1,095,972 $ (5,009 ) $ 118,042 $ (6,331 ) $ 1,214,014 $ (11,340 )
Amortized cost and estimated fair value of marketable debt securities	September 26, 2015 (In thousands) Amortized Estimated Due in one year or less $ 1,263,805 $ 1,263,844 Due after one year through five years 420,118 419,993 Due after five years through ten years 292,227 292,621 Due after ten years 1,115,744 1,119,588 $ 3,091,894 $ 3,096,046
Information on sale of available-for-sale securities	Certain information related to available-for-sale securities is as follows: Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Proceeds from sale of available-for-sale securities $ 54,989 $ 236,263 $ 121,030 $ 295,844 Gross realized gains on sale of available-for-sale securities $ 476 $ 2,243 $ 836 $ 3,080 Gross realized losses on sale of available-for-sale securities (88 ) (501 ) (218 ) (668 ) Net realized gains on sale of available-for-sale securities $ 388 $ 1,742 $ 618 $ 2,412 Amortization of premiums on available-for-sale securities $ 7,043 $ 6,413 $ 13,511 $ 12,646

Derivative Financial Instrume32

Derivative Financial Instruments (Tables)	6 Months Ended
	Sep. 26, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Forward currency exchange contracts outstanding	As of September 26, 2015 and March 28, 2015 , the Company had the following outstanding forward currency exchange contracts (in notional amount), which were derivative financial instruments: (In thousands and U.S. dollars) September 26, 2015 March 28, 2015 Singapore Dollar $ 30,565 $ 43,901 Euro 20,410 29,973 Indian Rupee 23,214 22,228 British Pound 11,600 12,946 Japanese Yen 3,526 4,994 $ 89,315 $ 114,042
Derivative Instruments Located on Condensed Consolidated Balance Sheet	The Company had the following derivative instruments as of September 26, 2015 and March 28, 2015 , located on the condensed consolidated balance sheet, utilized for risk management purposes detailed above: Foreign Exchange Contracts Asset Derivatives Liability Derivatives (In thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value September 26, 2015 Prepaid expenses and other current assets $ 194 Other accrued liabilities $ 4,727 March 28, 2015 Prepaid expenses and other current assets $ — Other accrued liabilities $ 9,320
Effect Of Derivative Instruments On Condensed Consolidated Statements Of Income	The following table summarizes the effect of derivative instruments on the condensed consolidated statements of income for the second quarter and the first six months of fiscal 2016 and 2015 : Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Amount of gains (losses) recognized in other comprehensive income on derivative (effective portion of cash flow hedging) $ 426 $ (3,838 ) $ (3,564 ) $ (4,123 ) Amount of gains (losses) reclassified from accumulated other comprehensive income into income (effective portion) * $ (2,071 ) $ 211 $ (3,944 ) $ 1,018 Amount of gains (losses) recorded (ineffective portion) * $ 7 $ (43 ) $ (22 ) $ (13 ) * Recorded in Interest and Other Expense location within the condensed consolidated statements of income.

Stock-Based Compensation Plan33

Stock-Based Compensation Plans (Tables)	6 Months Ended
	Sep. 26, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based compensation expense	The following table summarizes stock-based compensation expense related to stock awards granted under the Company’s equity incentive plans and rights to acquire stock granted under the Company’s Employee Stock Purchase Plan (ESPP): Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Stock-based compensation included in: Cost of revenues $ 1,763 $ 2,077 $ 3,727 $ 4,069 Research and development 12,934 14,831 27,626 25,336 Selling, general and administrative 11,984 11,832 21,648 21,441 $ 26,681 $ 28,740 $ 53,001 $ 50,846
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	The per share weighted-average fair value of RSUs granted during the second quarter of fiscal 2016 was $41.07 ( $44.40 for the second quarter of fiscal 2015 ), and for the first six months of fiscal 2016 was $41.13 ( $43.84 for the first six months of fiscal 2015 ), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: Three Months Ended Six Months Ended September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Risk-free interest rate 1.3 % 0.7 % 1.3 % 0.7 % Dividend yield 2.8 % 2.4 % 2.8 % 2.4 %
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	The fair values of stock purchase plan rights granted in the second quarter of fiscal 2016 and 2015 were estimated using the Black-Scholes option pricing model at the date of grant using the following assumptions: 2016 2015 Expected life of options (years) 1.25 1.25 Expected stock price volatility 0.25 0.25 Risk-free interest rate 0.4 % 0.2 % Dividend yield 3.0 % 2.8 %
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of option plans activity	A summary of the Company’s option plans activity and related information is as follows: Options Outstanding (Shares in thousands) Number of Shares Weighted-Average Exercise Price Per Share March 29, 2014 5,280 $ 25.22 Exercised (2,009 ) $ 25.80 Forfeited/cancelled/expired (24 ) $ 32.22 March 28, 2015 3,247 $ 24.81 Exercised (1,159 ) $ 24.64 Forfeited/cancelled/expired (12 ) $ 31.99 September 26, 2015 2,076 $ 24.86 Options exercisable at: September 26, 2015 2,039 $ 24.69 March 28, 2015 3,173 $ 24.59
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of restricted stock unit activity and related information	A summary of the Company’s RSU activity and related information is as follows: RSUs Outstanding (Shares in thousands) Number of Shares Weighted-Average Grant-Date Fair Value Per Share March 29, 2014 6,901 $ 35.08 Granted 3,201 $ 43.11 Vested (2,698 ) $ 33.82 Cancelled (531 ) $ 32.91 March 28, 2015 6,873 $ 39.07 Granted 2,754 $ 41.13 Vested (2,178 ) $ 37.18 Cancelled (399 ) $ 39.63 September 26, 2015 7,050 $ 40.42

Net Income Per Common Share Net

Net Income Per Common Share Net Income Per Common Share (Tables)	6 Months Ended
	Sep. 26, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table summarizes the computation of basic and diluted net income per common share: Three Months Ended Six Months Ended (In thousands, except per share amounts) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Net income available to common stockholders $ 127,298 $ 171,516 $ 275,013 $ 345,127 Weighted average common shares outstanding-basic 257,640 265,942 257,744 267,098 Dilutive effect of employee equity incentive plans 1,920 3,155 2,423 3,653 Dilutive effect of 2017 Convertible Notes and warrants 6,486 6,703 7,903 8,033 Weighted average common shares outstanding-diluted 266,046 275,800 268,070 278,784 Basic earnings per common share $ 0.49 $ 0.64 $ 1.07 $ 1.29 Diluted earnings per common share $ 0.48 $ 0.62 $ 1.03 $ 1.24

Inventories Inventories (Tables

Inventories Inventories (Tables)	6 Months Ended
	Sep. 26, 2015
Inventory Disclosure [Abstract]
Schedule of Inventory, Current [Table Text Block]	Inventories are stated at the lower of actual cost (determined using the first-in, first-out method), or market (estimated NRV) and are comprised of the following: (In thousands) September 26, 2015 March 28, 2015 Raw materials $ 12,014 $ 14,174 Work-in-process 163,090 183,472 Finished goods 37,869 33,682 $ 212,973 $ 231,328

Debt and Credit Facility (Table

Debt and Credit Facility (Tables)	6 Months Ended
	Sep. 26, 2015
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Schedule of Debt Instruments [Line Items]
Carrying values of liability and equity components of debentures	The carrying values of the liability and equity components of the 2017 Convertible Notes are reflected in the Company’s condensed consolidated balance sheets as follows: (In thousands) September 26, 2015 March 28, 2015 Liability component: Principal amount of the 2017 Convertible Notes $ 600,000 $ 600,000 Unamortized discount of liability component (25,907 ) (33,679 ) Hedge accounting adjustment – sale of interest rate swap 7,487 9,732 Net carrying value of the 2017 Convertible Notes $ 581,580 $ 576,053 Equity component (including temporary equity) – net carrying value $ 66,415 $ 66,415
Interest Expense Related to Debentures [Table Text Block]	Interest expense related to the 2017 Convertible Notes was included in interest and other expense, net on the condensed consolidated statements of income as follows: Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Contractual coupon interest $ 3,938 $ 3,938 $ 7,875 $ 7,875 Amortization of debt issuance costs 362 362 724 724 Amortization of debt discount, net 2,763 2,763 5,526 5,526 Total interest expense related to the 2017 Convertible Notes $ 7,063 $ 7,063 $ 14,125 $ 14,125
2019 and 2021 Notes Payable [Member]
Schedule of Debt Instruments [Line Items]
Schedule of Long-term Debt Instruments [Table Text Block]	The following table summarizes the carrying value of the 2019 and 2021 Notes as of September 26, 2015 and March 28, 2015 : (In thousands) September 26, 2015 March 28, 2015 Principal amount of the 2019 Notes $ 500,000 $ 500,000 Unamortized discount of the 2019 Notes (1,818 ) (2,073 ) Principal amount of the 2021 Notes 500,000 500,000 Unamortized discount of the 2021 Notes (2,849 ) (3,088 ) Total carrying value $ 995,333 $ 994,839
Interest Expense Related to Debentures [Table Text Block]	Interest expense related to the 2019 and 2021 Notes was included in interest and other expense, net on the condensed consolidated statements of income as follows: Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Contractual coupon interest $ 6,406 $ 6,406 $ 12,813 $ 12,813 Amortization of debt issuance costs 146 134 293 290 Amortization of debt discount, net 247 242 493 482 Total interest expense related to the 2019 and 2021 Notes $ 6,799 $ 6,782 $ 13,599 $ 13,585

Interest And Other Expense, N37

Interest And Other Expense, Net (Tables)	6 Months Ended
	Sep. 26, 2015
Other Income and Expenses [Abstract]
Components of interest and other expense, net	The components of interest and other expense, net are as follows: Three Months Ended Six Months Ended (In thousands) September 26, 2015 September 27, 2014 September 26, 2015 September 27, 2014 Interest income $ 8,124 $ 8,392 $ 16,099 $ 16,893 Interest expense (13,862 ) (13,845 ) (27,724 ) (27,710 ) Other expense, net (3,475 ) (278 ) (8,115 ) (1,136 ) $ (9,213 ) $ (5,731 ) $ (19,740 ) $ (11,953 )

Accumulated Other Comprehensi38

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Sep. 26, 2015
Equity [Abstract]
Components of accumulated other comprehensive income (loss)	The components of accumulated other comprehensive loss are as follows: (In thousands) September 26, 2015 March 28, 2015 Accumulated unrealized losses on available-for-sale securities, net of tax $ (5,614 ) $ (238 ) Accumulated unrealized losses on hedging transactions, net of tax (3,957 ) (7,523 ) Accumulated cumulative translation adjustment, net of tax (4,935 ) (3,388 ) Accumulated other comprehensive loss $ (14,506 ) $ (11,149 )

Commitments (Tables)

Commitments (Tables)	6 Months Ended
	Sep. 26, 2015
Commitments and Contingencies Disclosure [Abstract]
Future minimum lease payments under non-cancelable operating leases	Approximate future minimum lease payments under non-cancelable operating leases are as follows: Fiscal (In thousands) 2016 (remaining six months) $ 2,486 2017 3,972 2018 2,792 2019 2,474 2020 1,657 Thereafter 2,145 Total $ 15,526

Goodwill and Acquisition-Rela40

Goodwill and Acquisition-Related Intangibles (Tables)	6 Months Ended
	Sep. 26, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Gross and net amounts of goodwill and of acquisition-related intangibles	As of September 26, 2015 and March 28, 2015 , the gross and net amounts of goodwill and of acquisition-related intangibles for all acquisitions were as follows: Weighted-Average (In thousands) September 26, 2015 March 28, 2015 Amortization Life Goodwill $ 159,296 $ 159,296 Core technology, gross 77,640 77,640 5.6 years Less accumulated amortization (68,493 ) (64,988 ) Core technology, net 9,147 12,652 Other intangibles, gross 46,606 46,606 2.7 years Less accumulated amortization (46,539 ) (46,506 ) Other intangibles, net 67 100 Total acquisition-related intangibles, gross 124,246 124,246 Less accumulated amortization (115,032 ) (111,494 ) Total acquisition-related intangibles, net $ 9,214 $ 12,752
Schedule of expected annual amortization expense for acquisition-related intangibles	Based on the carrying value of acquisition-related intangibles recorded as of September 26, 2015 , and assuming no subsequent impairment of the underlying assets, the annual amortization expense for acquisition-related intangibles is expected to be as follows: Fiscal (In thousands) 2016 (remaining six months) $ 3,012 2017 4,761 2018 1,374 2019 67 Total $ 9,214

Significant Customers and Con41

Significant Customers and Concentrations of Credit Risk (Details) - Customer	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Mar. 28, 2015
Significant Customers and Concentrations of Credit Risk [Abstract]
Percentage of Accounts Receivable Accounted From Company Distributor One	70.00%		70.00%		67.00%
Percentage of net revenues through resale of product from Company Distributor One	50.00%	43.00%	51.00%	43.00%
Number of End Customers Accounted For 10% or More of Net Revenues	0	0	0	0
Percentage of higher grade securities investment in debt securities	89.00%		89.00%
Percentage of Mortgage Backed Securities In Investment Portfolio	33.00%		33.00%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Jun. 27, 2015	Mar. 28, 2015	Jun. 28, 2014	Mar. 29, 2014
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 10,413	$ 20,608	$ 10,413	$ 20,608	$ 10,409	$ 10,312	$ 20,704	$ 20,160
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	4	$ (96)	101	$ 448
Fair Value, Measurements, Recurring [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	3,388,182		3,388,182			3,471,356
Derivative Liability	4,533		4,533			9,251
Fair Value Assets Measured On Recurring Basis Net	3,383,649		3,383,649			3,462,105
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	354,296		354,296			492,097
Derivative Liability	0		0			0
Fair Value Assets Measured On Recurring Basis Net	354,296		354,296			492,097
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	3,023,473		3,023,473			2,968,947
Derivative Liability	4,533		4,533			9,251
Fair Value Assets Measured On Recurring Basis Net	3,018,940		3,018,940			2,959,696
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	10,413		10,413			10,312
Derivative Liability	0		0			0
Fair Value Assets Measured On Recurring Basis Net	10,413		10,413			10,312
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Money Market Funds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	203,815		203,815			235,583
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	75,006		75,006			229,999
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	257,342		257,342			89,995
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	5,000		5,000			200,392
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	75,924		75,924			37,996
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	203,815		203,815			235,583
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	75,006		75,006			229,999
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	257,342		257,342			89,995
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	5,000		5,000			200,392
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	75,924		75,924			37,996
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	225,000		225,000			75,000
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	214,189		214,189			339,029
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	55,856		55,856			40,006
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	446,578		446,578			557,524
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	125,557		125,557			159,936
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	207,461		207,461			204,510
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	963,354		963,354			897,776
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	34,650		34,650			38,608
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Bank Loans [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	104,052		104,052			98,100
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	158,476		158,476
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	150,481		150,481			256,514
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Bank Loans [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	225,000		225,000			75,000
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	214,189		214,189			339,029
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	55,856		55,856			40,006
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	296,097		296,097			301,010
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	125,557		125,557			159,936
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	207,461		207,461			204,510
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	963,354		963,354			897,776
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	34,650		34,650			38,608
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Loans [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	104,052		104,052			98,100
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	158,476		158,476
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Bank Loans [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Student loan auction rate securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	10,413		10,413			10,312
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	7,258		7,258			9,650
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	7,387		7,387			7,948
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	156,851		156,851			182,400
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	53,671		53,671			56,592
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	342		342
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Student loan auction rate securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Student loan auction rate securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	7,258		7,258			9,650
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	7,387		7,387			7,948
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	156,851		156,851			182,400
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	53,671		53,671			56,592
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	342		342
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Student loan auction rate securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	10,413		10,413			10,312
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	$ 0		$ 0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	$ 0		$ 0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			$ 0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	$ 0		$ 0

Fair Value Measurements (Deta43

Fair Value Measurements (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Changes in Level 3 instruments measured at fair value on a recurring basis
Balance as of beginning of period	$ 10,409	$ 20,704	$ 10,312	$ 20,160
Total realized and unrealized gains (losses) included in other comprehensive income	4	(96)	101	448
Balance as of end of period	$ 10,413	$ 20,608	$ 10,413	$ 20,608

Fair Value Measurements (Deta44

Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Noncurrent	$ 235,922	$ 266,902	[1]
Available-for-sale Securities	3,388,182	$ 3,471,356
Senior Notes [Member] | 2.125% 2019 Senior Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debentures	500,200
Senior Notes [Member] | 3.0% 2021 Senior Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debentures	506,900
Convertible Notes [Member] | Two And Six Two Five Percent Senior Convertible Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debentures	$ 889,800
[1]	Derived from audited financial statements

Financial Instruments (Details)

Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015
Available-for-sale securities
Amortized Cost	$ 3,397,059	$ 3,471,735
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	11,018	10,961
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(19,895)	(11,340)
Estimated Fair Value	3,388,182	3,471,356
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	203,815	235,583
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Estimated Fair Value	203,815	235,583
Financial institution securities [Member]
Available-for-sale securities
Amortized Cost	300,006	304,999
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Estimated Fair Value	300,006	304,999
Non-financial institution securities [Member]
Available-for-sale securities
Amortized Cost	471,681	429,005
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	82	25
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(232)	(6)
Estimated Fair Value	471,531	429,024
Auction Rate Securities [Member]
Available-for-sale securities
Amortized Cost	10,500	10,500
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(87)	(188)
Estimated Fair Value	10,413	10,312
Municipal Bonds [Member]
Available-for-sale securities
Amortized Cost	62,776	49,064
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	584	744
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(246)	(152)
Estimated Fair Value	63,114	49,656
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	451,441	757,954
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	144	91
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(7)	(129)
Estimated Fair Value	451,578	757,916
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	201,481	197,932
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Estimated Fair Value	201,481	197,932
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	1,116,561	1,075,730
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	8,489	8,942
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(4,845)	(4,496)
Estimated Fair Value	1,120,205	1,080,176
Asset-backed Securities [Member]
Available-for-sale securities
Amortized Cost	214,120	211,487
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,251	1,130
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(523)	(159)
Estimated Fair Value	214,848	212,458
Debt Mutual Fund [Member]
Available-for-sale securities
Amortized Cost	101,350	101,350
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(13,029)	(6,150)
Estimated Fair Value	88,321	95,200
Bank Loans [Member]
Available-for-sale securities
Amortized Cost	104,101	98,131
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	44	29
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(93)	(60)
Estimated Fair Value	104,052	98,100
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Amortized Cost	159,227	0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	424	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(833)	0
Estimated Fair Value	$ 158,818	$ 0

Financial Instruments (Details

Financial Instruments (Details 1) - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	$ 845,489	$ 1,095,972
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(10,736)	(5,009)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	156,859	118,042
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(9,159)	(6,331)
Available-for-Sale Securities, Fair Value, Total	1,002,348	1,214,014
Available-for-Sale Securities, Gross Unrealized Losses, Total	(19,895)	(11,340)
Non-financial institution securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	65,885	7,190
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(232)	(6)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	0	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	0	0
Available-for-Sale Securities, Fair Value, Total	65,885	7,190
Available-for-Sale Securities, Gross Unrealized Losses, Total	(232)	(6)
Auction Rate Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	0	0
Available-for-Sale Securities, 12 Months or Greater, Fair Value	10,414	10,312
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(87)	(188)
Available-for-Sale Securities, Fair Value, Total	10,414	10,312
Available-for-Sale Securities, Gross Unrealized Losses, Total	(87)	(188)
Municipal Bonds [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	24,204	10,014
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(107)	(94)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	2,407	1,931
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(139)	(58)
Available-for-Sale Securities, Fair Value, Total	26,611	11,945
Available-for-Sale Securities, Gross Unrealized Losses, Total	(246)	(152)
U.S. Government and Agency Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	63,640	451,296
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(7)	(129)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	0	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	0	0
Available-for-Sale Securities, Fair Value, Total	63,640	451,296
Available-for-Sale Securities, Gross Unrealized Losses, Total	(7)	(129)
Mortgage-Backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	471,040	448,770
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(3,681)	(3,169)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	52,141	49,207
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(1,164)	(1,327)
Available-for-Sale Securities, Fair Value, Total	523,181	497,977
Available-for-Sale Securities, Gross Unrealized Losses, Total	(4,845)	(4,496)
Asset-backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	72,972	75,009
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(479)	(159)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	9,631	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(44)	0
Available-for-Sale Securities, Fair Value, Total	82,603	75,009
Available-for-Sale Securities, Gross Unrealized Losses, Total	(523)	(159)
Debt Mutual Fund [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	34,650	38,608
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(5,350)	(1,392)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	53,671	56,592
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(7,679)	(4,758)
Available-for-Sale Securities, Fair Value, Total	88,321	95,200
Available-for-Sale Securities, Gross Unrealized Losses, Total	(13,029)	(6,150)
Bank Loans [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	42,444	65,085
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(61)	(60)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	28,253	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(32)	0
Available-for-Sale Securities, Fair Value, Total	70,697	65,085
Available-for-Sale Securities, Gross Unrealized Losses, Total	(93)	$ (60)
Commercial Mortgage Backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	70,654
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(819)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	342
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(14)
Available-for-Sale Securities, Fair Value, Total	70,996
Available-for-Sale Securities, Gross Unrealized Losses, Total	$ (833)

Financial Instruments (Detail47

Financial Instruments (Details 2) $ in Thousands	Sep. 26, 2015USD ($)
Investments, All Other Investments [Abstract]
Marketable debt securities with contractual maturities greater than one year but classified as short-term investment	$ 1,680,000
Amortized cost and estimated fair value of marketable debt securities
Amortized Cost Due in one year or less	1,263,805
Amortized Cost Due after one year through five years	420,118
Amortized Cost Due after five years through ten years	292,227
Amortized Cost Due after ten years	1,115,744
Amortized Cost Total	3,091,894
Estimated Fair Value Due in one year or less	1,263,844
Estimated Fair Value Due after one year through five years	419,993
Estimated Fair Value Due after five years through ten years	292,621
Estimated Fair Value Due after ten years	1,119,588
Estimated Fair Value Total	$ 3,096,046

Financial Instruments (Detail48

Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Investments, All Other Investments [Abstract]
Proceeds from Sale of Available-for-sale Securities	$ 54,989	$ 236,263	$ 121,030	$ 295,844
Information on sale of available-for-sale securities
Gross realized gains on sale of available-for-sale securities	476	2,243	836	3,080
Gross realized losses on sale of available-for-sale securities	(88)	(501)	(218)	(668)
Net realized gains (losses) on sale of available-for-sale securities	388	1,742	618	2,412
Amortization of premiums on available-for-sale securities	$ 7,043	$ 6,413	$ 13,511	$ 12,646

Derivative Financial Instrume49

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 89,315	$ 114,042
Singapore Dollar [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	30,565	43,901
Euro [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	20,410	29,973
Indian Rupee [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	23,214	22,228
British Pound [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	11,600	12,946
Japanese Yen [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 3,526	$ 4,994

Derivative Financial Instrume50

Derivative Financial Instruments (Details 1) - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015
Prepaid expenses and other current assets
Derivative Instruments located on Condensed Consolidated Balance sheet
Asset Derivatives, Fair Value	$ 194	$ 0
Other accrued liabilities
Derivative Instruments located on Condensed Consolidated Balance sheet
Liability Derivatives, Fair Value	$ 4,727	$ 9,320

Derivative Financial Instrume51

Derivative Financial Instruments (Details 2) - Cash Flow Hedging [Member] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Foreign Exchange Contracts [Member]
Effect of derivative instruments located on condensed consolidated Statements of Income
Amount of gains (losses) recognized in other comprehensive income on derivative (effective portion of cash flow hedging)		$ 426	$ (3,838)	$ (3,564)	$ (4,123)
Other Nonoperating Income (Expense) [Member]
Effect of derivative instruments located on condensed consolidated Statements of Income
Amount of (gains) losses reclassified from accumulated other comprehensive income into income (effective portion)	[1]	(2,071)	211	(3,944)	1,018
Amount of gains (losses) recorded (ineffective portion)	[1]	$ 7	$ (43)	$ (22)	$ (13)
[1]	Recorded in Interest and Other Expense location within the condensed consolidated statements of income.

Derivative Financial Instrume52

Derivative Financial Instruments (Details Textual)	6 Months Ended
	Sep. 26, 2015
Derivative [Line Items]
Hedging Program number of years	2 years
Maturity of Foreign Currency Derivatives	Nov. 15, 2016
Number of Months Net Unrealized Gains/Losses are expected to be realized into Net Income	12 months

Stock-Based Compensation Plan53

Stock-Based Compensation Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Stock Based compensation expense
Stock-based compensation effect on income before taxes	$ 26,681	$ 28,740	$ 53,001	$ 50,846
Cost of Sales [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	1,763	2,077	3,727	4,069
Research and Development [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	12,934	14,831	27,626	25,336
Selling, General and Administrative Expenses [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	$ 11,984	$ 11,832	$ 21,648	$ 21,441

Stock-Based Compensation Plan54

Stock-Based Compensation Plans (Details 1)	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Weighted average assumptions in estimation of fair value of stock options
Risk-free interest rate	1.30%	0.70%	1.30%	0.70%
Dividend yield	2.80%	2.40%	2.80%	2.40%

Stock-Based Compensation Plan55

Stock-Based Compensation Plans (Details 2) - $ / shares shares in Thousands	6 Months Ended	12 Months Ended
	Sep. 26, 2015	Mar. 28, 2015
Summary of options activity
Number of Shares, Beginning Balance	3,247	5,280
Number of Shares, Exercised	(1,159)	(2,009)
Number of Shares, Forfeited/Cancelled/Expired	(12)	(24)
Number of Shares, Ending Balance	2,076	3,247
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,039	3,173
Weighted-Average Exercise Price Per Share, Beginning Balance	$ 24.81	$ 25.22
Weighted-Average Exercise Price Per Share, Exercised	24.64	25.80
Weighted-Average Exercise Price Per Share, Forfeited/Cancelled/Expired	31.99	32.22
Weighted-Average Exercise Price Per Share, Ending Balance Balance	24.86	24.81
Weighted-Average Exercise Price Per Share, Options Exercisable	$ 24.69	$ 24.59

Stock-Based Compensation Plan56

Stock-Based Compensation Plans (Details 3) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Mar. 28, 2015
Summary Of Restricted Stock Unit Activity and Related Information
Number of Shares, Beginning Balance			6,873	6,901	6,901
Number of Shares, Granted			2,754		3,201
Number of Shares, Vested			(2,178)		(2,698)
Number of Shares, Forfeited/Cancelled			(399)		(531)
Number of Shares, Ending Balance	7,050		7,050		6,873
Weighted-Average Grant-Date Fair Value, Beginning Balance			$ 39.07	$ 35.08	$ 35.08
Weighted-Average Grant-Date Fair Value, Granted					43.11
Weighted-Average Grant-Date Fair Value, Vested			37.18		33.82
Weighted-Average Grant-Date Fair Value, Forfeited/Cancelled			39.63		32.91
Weighted-Average Grant-Date Fair Value, Ending Balance	$ 40.42		40.42		$ 39.07
Restricted Stock Units (RSUs) [Member]
Summary Of Restricted Stock Unit Activity and Related Information
Weighted-Average Grant-Date Fair Value, Granted	$ 41.07	$ 44.40	$ 41.13	$ 43.84

Stock-Based Compensation Plan57

Stock-Based Compensation Plans (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Mar. 28, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Payments Related to Tax Withholding for Share-based Compensation			$ 28.6	$ 31.7
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			7.3	9.9
Weighted-Average Grant-Date Fair Value, Granted					$ 43.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 7.5	$ 4.8	$ 23.3	$ 15.9
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.30%	0.70%	1.30%	0.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.80%	2.40%	2.80%	2.40%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant-Date Fair Value, Granted	$ 41.07	$ 44.40	$ 41.13	$ 43.84
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans	438	446
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 14.5	$ 14.9
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	1 year 3 months	1 year 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	24.50%	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.40%	0.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	3.00%	2.80%
Equity Plan Two Thousand Seven [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant	13,000		13,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant-Date Fair Value, Granted	$ 9.78	$ 9.75
Shares Available for Grant	10,100		10,100

Net Income Per Common Share (De

Net Income Per Common Share (Details) shares in Millions	3 Months Ended	6 Months Ended
	Sep. 26, 2015$ / sharesshares	Sep. 26, 2015shares
Schedule of Debt Instruments [Line Items]
Antidilutive shares excluded from computation of dilutive net income per common share	1.7	3
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Schedule of Debt Instruments [Line Items]
Maximum number of common shares to be purchased under call option	20.5	20.5
Price Per Share To Be Purchase By Company Under Call Option | $ / shares	$ 29.2608

Net Income Per Common Share N59

Net Income Per Common Share Net Income Per Common Share (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Earnings Per Share [Abstract]
Net income	$ 127,298	$ 171,516	$ 275,013	$ 345,127
Weighted Average Number of Shares Outstanding, Basic	257,640	265,942	257,744	267,098
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,920	3,155	2,423	3,653
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities and Warrants	6,486	6,703	7,903	8,033
Weighted Average Number of Shares Outstanding, Diluted	266,046	275,800	268,070	278,784
Earnings Per Share, Basic	$ 0.49	$ 0.64	$ 1.07	$ 1.29
Earnings Per Share, Diluted	$ 0.48	$ 0.62	$ 1.03	$ 1.24

Inventories Inventories (Detail

Inventories Inventories (Details) - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Gross	$ 12,014	$ 14,174
Inventory, Work in Process, Gross	163,090	183,472
Inventory, Finished Goods, Gross	37,869	33,682
Inventory, Net	$ 212,973	$ 231,328	[1]
[1]	Derived from audited financial statements

Debt and Credit Facility (Detai

Debt and Credit Facility (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 26, 2015	Sep. 26, 2015	Mar. 29, 2014	Mar. 28, 2015
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	$ 995,333	$ 995,333		$ 994,839	[1]
2019 and 2021 Notes Payable [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt			$ 990,100
3.0% 2021 Senior Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000	500,000		500,000
Debt Instrument, Unamortized Discount	$ (2,849)	$ (2,849)		(3,088)
Debt instrument, Maturity Date		Mar. 15, 2021
Discount Percent of Par	99.281%	99.281%
2.125% 2019 Senior Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000	$ 500,000		500,000
Debt Instrument, Unamortized Discount	$ (1,818)	$ (1,818)		(2,073)
Debt instrument, Maturity Date		Mar. 15, 2019
Discount Percent of Par	99.477%	99.477%
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Price Per Share To Be Purchase By Company Under Call Option	$ 29.2608
Debt Instrument, Face Amount	$ 600,000	$ 600,000		600,000
Debt Instrument, Unamortized Discount	(25,907)	(25,907)		(33,679)
Debt Instrument Carrying Amount Of Liability Component	581,580	581,580		576,053
Equity component - net carrying value	$ 66,415	$ 66,415		$ 66,415
[1]	Derived from audited financial statements

Debt and Credit Facility (Det62

Debt and Credit Facility (Details 1) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Mar. 29, 2014	Mar. 28, 2015
Debt Instrument [Line Items]
Amortization of Debt Discount (Premium)			$ 6,019,000	$ 6,008,000
Line of Credit Facility, Expiration Date			Dec. 31, 2016
Line of Credit Facility, Maximum Borrowing Capacity	$ 250,000,000		$ 250,000,000
Line of Credit Facility, Average Outstanding Amount			0
2019 and 2021 Notes Payable [Member]
Debt Instrument [Line Items]
Interest Expense, Debt, Excluding Amortization	6,406,000	$ 6,406,000	12,813,000	12,813,000
Amortization of Financing Costs	146,000	134,000	293,000	290,000
Amortization of Debt Discount (Premium)	247,000	242,000	493,000	482,000
Interest Expense, Debt	6,799,000	$ 6,782,000	13,599,000	$ 13,585,000
Proceeds from Issuance of Long-term Debt					$ 990,100,000
2.125% 2019 Senior Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000,000		500,000,000			$ 500,000,000
Debt Instrument, Unamortized Discount	$ 1,818,000		$ 1,818,000			$ 2,073,000

Debt and Credit Facility (Det63

Debt and Credit Facility (Details 2) $ / shares in Units, shares in Millions	3 Months Ended		6 Months Ended
	Sep. 26, 2015USD ($)$ / sharesshares	Sep. 27, 2014USD ($)	Sep. 26, 2015USD ($)$ / sharesshares	Sep. 27, 2014USD ($)	Mar. 28, 2015USD ($)
Short-term Debt [Line Items]
Amortization of Debt Discount (Premium)			$ 6,019,000	$ 6,008,000
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Short-term Debt [Line Items]
Maximum number of common shares to be purchased under call option | shares	20.5		20.5
Debt Instrument, Convertible, Remaining Discount Amortization Period			1 year 8 months 19 days
Debt Instrument, Face Amount	$ 600,000,000		$ 600,000,000		$ 600,000,000
Debt Instrument, Convertible, Conversion Ratio	34.1754
Debt Instrument, Unamortized Discount	$ 25,907,000		25,907,000		33,679,000
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	7,487,000		7,487,000		9,732,000
Debt Instrument Carrying Amount Of Liability Component	581,580,000		581,580,000		576,053,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	66,415,000		66,415,000		$ 66,415,000
Interest Expense, Debt, Excluding Amortization	3,938,000	$ 3,938,000	7,875,000	7,875,000
Amortization of Financing Costs	362,000	362,000	724,000	724,000
Amortization of Debt Discount (Premium)	2,763,000	2,763,000	5,526,000	5,526,000
Interest Expense, Debt	7,063,000	$ 7,063,000	$ 14,125,000	$ 14,125,000
Base conversion, block amount of senior convertible debenture	$ 1,000
Warrants, number of shares the holders have the right to purchase | shares	20.5		20.5
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 41.45		$ 41.45
Convertible debt, conversion price | $ / shares	$ 29.2608		$ 29.2608
Debt Instrument, Convertible, If-converted Value in Excess of Principal	$ 859,100,000		$ 859,100,000

Common Stock Repurchase Progr64

Common Stock Repurchase Program (Details) - USD ($)	6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Mar. 28, 2015	Dec. 27, 2014
Accelerated Share Repurchases [Line Items]
Treasury shares	0		0
Stock Repurchased During Period, Shares	4,600,000
Payments for Repurchase of Common Stock	$ 199,998,000	$ 301,015,000
Repurchase Program Two Thousand Fourteen [Member]
Accelerated Share Repurchases [Line Items]
Amount authorized for common stock repurchase				$ 800,000,000
Stock Repurchased and Retired During Period, Value	352,600,000
Total amount available for future repurchases	447,400,000
Repurchase Program 2012 [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value	$ 200,000,000	$ 300,000,000
Stock Repurchased and Retired During Period, Shares		7,000,000

Interest and Other Expense, N65

Interest and Other Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Components of interest and other expense
Interest income	$ 8,124	$ 8,392	$ 16,099	$ 16,893
Interest expense	(13,862)	(13,845)	(27,724)	(27,710)
Other income (expense), net	(3,475)	(278)	(8,115)	(1,136)
Interest and other expense, net	$ (9,213)	$ (5,731)	$ (19,740)	$ (11,953)

Accumulated Other Comprehensi66

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015
Components of accumulated other comprehensive income (loss)
Accumulated unrealized gains (losses) on available-for-sale securities, net of tax	$ (5,614)	$ (238)
Accumulated unrealized gain (losses) on hedging transactions, net of tax	(3,957)	(7,523)
Accumulated cumulative translation adjustment, net of tax	(4,935)	(3,388)
Accumulated other comprehensive income (loss)	$ (14,506)	$ (11,149)	[1]
[1]	Derived from audited financial statements

Income Taxes (Details Textual)

Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 16,671	$ 22,802	$ 36,923	$ 49,469
Effective Income Tax Rate Reconciliation, Percent	12.00%	12.00%	12.00%	13.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Unrecognized Tax Benefits	$ 30,000		$ 30,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 12,400		$ 12,400

Commitments (Details)

Commitments (Details) $ in Thousands	Sep. 26, 2015USD ($)
Future Minimum Lease Payments Under Non-Cancelable Operating Leases [Abstract]
2016 (remaining 6 months)	$ 2,486
2,017	3,972
2,018	2,792
2,019	2,474
2,020	1,657
Thereafter	2,145
Total	$ 15,526

Commitments (Details Textual)

Commitments (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Commitments [Line Items]
Lease Expiration Date			Oct. 31, 2021
Aggregate future rental income to be received	$ 3,000		$ 3,000
Rent expense, net of rental income	1,300	$ 697	2,100	$ 1,500
Other commitments	97,200		97,200
Non-cancelable license obligations	$ 21,400		$ 21,400
Software and Maintenance License Obligations Expiration Date			Jun. 30, 2017
Minimum [Member]
Commitments [Line Items]
Purchase Commitments, Period for Payment			3 months
Maximum [Member]
Commitments [Line Items]
Purchase Commitments, Period for Payment			6 months

Contingencies (Details)

Contingencies (Details) $ in Millions	3 Months Ended
	Sep. 26, 2015USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 50

Contingencies Loss Contingency,

Contingencies Loss Contingency, Damages Sought For Each Unspecified Claim (Details)	3 Months Ended
	Sep. 26, 2015
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Damages Sought For Each Unspecified Claim	11

Goodwill and Acquisition-Rela72

Goodwill and Acquisition-Related Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 26, 2015	Mar. 28, 2015
Gross and net amounts of goodwill and of acquisition-related intangibles
Goodwill	$ 159,296	$ 159,296	[1]
Total acquisition-related intangibles, gross	124,246	124,246
Less accumulated amortization	(115,032)	(111,494)
Total	9,214	12,752
Core Technology [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	77,640	77,640
Less accumulated amortization	(68,493)	(64,988)
Total	$ 9,147	12,652
Weighted-Average Amortization Life	5 years 7 months 18 days
Other Intangibles [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	$ 46,606	46,606
Less accumulated amortization	(46,539)	(46,506)
Total	$ 67	$ 100
Weighted-Average Amortization Life	2 years 8 months 12 days
[1]	Derived from audited financial statements

Goodwill and Acquisition-Rela73

Goodwill and Acquisition-Related Intangibles (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Mar. 28, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquisition-related intangibles	$ 1,769	$ 2,378	$ 3,538	$ 4,796
Schedule of expected annual amortization expense for acquisition-related intangibles
2016 (remaining six months)	3,012		3,012
2,017	4,761		4,761
2,018	1,374		1,374
2,019	67		67
Total	$ 9,214		$ 9,214		$ 12,752

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Subsequent Events [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.31	$ 0.29	$ 0.62	$ 0.58

Restructuring Charges (Details)

Restructuring Charges (Details) $ in Millions	3 Months Ended
	Mar. 28, 2015USD ($)position	Sep. 26, 2015USD ($)
Restructuring and Related Activities [Abstract]
Restructuring and Related Cost, Expected Number of Positions Eliminated | position	120
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent	3.00%
Restructuring Charges	$ 24.5
Restructuring Reserve		$ 3