Xilinx (XLNX) 10-Q 28 Oct 13 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Sep. 28, 2013	Oct. 18, 2013
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	28-Sep-13
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Entity Registrant Name	XILINX INC
Entity Central Index Key	743988
Current Fiscal Year End Date	-26
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		268,313,590

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Income Statement [Abstract]
Net revenues	$598,937	$543,933	$1,177,892	$1,126,717
Cost of revenues	182,816	187,713	362,516	386,124
Gross margin	416,121	356,220	815,376	740,593
Operating expenses:
Research and development	125,002	113,887	236,543	235,334
Selling, general and administrative	96,339	91,928	188,726	188,129
Amortization of acquisition-related intangibles	2,418	2,319	4,836	4,467
Litigation and contingencies	28,600	0	28,600	0
Total operating expenses	252,359	208,134	458,705	427,930
Operating income	163,762	148,086	356,671	312,663
Interest and other expense, net	10,997	10,003	20,927	19,675
Income before income taxes	152,765	138,083	335,744	292,988
Provision for income taxes	11,304	14,646	37,260	39,720
Net income	$141,461	$123,437	$298,484	$253,268
Net income per common share:
Basic	$0.53	$0.47	$1.12	$0.97
Diluted	$0.49	$0.46	$1.05	$0.93
Cash dividends per common share	$0.25	$0.22	$0.50	$0.44
Shares used in per share calculations:
Basic	268,478	260,605	265,350	262,143
Diluted	290,685	270,265	284,270	272,182

Condensed_Consolidated_Stateme1

Condensed Consolidated Statement of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Statement of Comprehensive Income [Abstract]
Net income	$141,461	$123,437	$298,484	$253,268
Other comprehensive income (loss), net of tax:
Change in net unrealized gain (loss) on available-for-sale securities	2,995	5,650	-13,930	7,152
Reclassification adjustment for (gain) loss on available-for-sale securities	155	-585	-167	-915
Change in net unrealized gain (loss) on hedging transactions	1,353	9,801	-155	8,496
Reclassification adjustment for (gain) loss on hedging transactions	1,389	-1,833	2,095	-2,992
Cumulative translation adjustment	-371	622	-1,064	-433
Other comprehensive income (loss)	5,521	13,655	-13,221	11,308
Total comprehensive income	$146,982	$137,092	$285,263	$264,576

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 28, 2013	Mar. 30, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$570,494	$623,558	[1]
Short-term investments	1,693,571	1,091,187	[1]
Accounts receivable, net	277,539	229,175	[1]
Inventories	183,708	201,250	[1]
Deferred tax assets	2,138	60,709	[1]
Prepaid expenses and other current assets	73,756	91,760	[1]
Total current assets	2,801,206	2,297,639	[1]
Property, plant and equipment, at cost:	801,655	784,796	[1]
Accumulated depreciation and amortization	-444,235	-419,109	[1]
Net property, plant and equipment	357,420	365,687	[1]
Long-term investments	1,436,781	1,651,033	[1]
Goodwill	158,990	158,990	[1]
Acquisition-related intangibles, net	31,219	36,054	[1]
Other assets	214,436	220,048	[1]
Total Assets	5,000,052	4,729,451	[1]
Current liabilities:
Accounts payable	88,947	72,766	[1]
Accrued payroll and related liabilities	153,279	124,195	[1]
Income taxes payable	4,144	60,632	[1]
Deferred income on shipments to distributors	68,814	53,358	[1]
Deferred tax liabilities	126,211	51	[1]
Other accrued liabilities	110,690	75,786	[1]
Convertible debentures (Note 10)	930,085	0	[1]
Total current liabilities	1,482,170	386,788	[1]
Convertible debentures (Note 10)	0	922,666	[1]
Deferred tax liabilities	269,250	415,442	[1]
Long-term income taxes payable	14,545	37,579	[1]
Other long-term liabilities	2,211	3,680	[1]
Commitments and contingencies			[1]
Temporary equity (Note 10)	359,549	0	[1]
Stockholders' equity:
Preferred stock, $.01 par value (none issued)	0	0	[1]
Common stock, $.01 par value	2,682	2,636	[1]
Additional paid-in capital	1,060,125	1,276,278	[1]
Retained earnings	1,814,081	1,675,722	[1]
Accumulated other comprehensive income (loss)	-4,561	8,660	[1]
Total stockholders' equity	2,872,327	2,963,296	[1]
Total Liabilities, Temporary Equity and Stockholders' Equity	$5,000,052	$4,729,451	[1]
[1]	Derived from audited financial statements

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 28, 2013	Mar. 30, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares issued	0	0
Common stock, par value	$0.01	$0.01

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013		Sep. 29, 2012
Cash flows from operating activities:
Net income	$298,484		$253,268
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	28,009		28,754
Amortization	9,770		8,455
Stock-based compensation	44,014		36,854
Net (gain) loss on sale of available-for-sale securities	148		-1,741
Amortization of debt discount on convertible debentures	8,073		7,897
Provision for deferred income taxes	43,754		35,900
Excess tax benefit from stock-based compensation	-18,914		-4,766
Others	-691		643
Changes in assets and liabilities:
Accounts receivable, net	-48,364		-7,305
Inventories	17,634		675
Prepaid expenses and other current assets	-6,667		5,931
Other assets	-7,016		-1,750
Accounts payable	-16,181		-17,865
Accrued liabilities	71,660		1,444
Income taxes payable	-72,380		-2,773
Deferred income on shipments to distributors	15,457		-19,035
Net cash provided by operating activities	399,152		360,316
Cash flows from investing activities:
Purchases of available-for-sale securities	-2,178,565		-2,020,793
Proceeds from sale and maturity of available-for-sale securities	1,767,178		1,766,216
Purchases of property, plant and equipment	-19,742		-15,978
Other investing activities	37,217		-27,649
Net cash used in investing activities	-393,912		-298,204
Cash flows from financing activities:
Repurchases of common stock	-69,981		-178,148
Proceeds from issuance of common stock through various stock plans	125,968		32,888
Payment of dividends to stockholders	-133,205		-115,321
Excess tax benefit from stock-based compensation	18,914		4,766
Net cash used in financing activities	-58,304		-255,815
Net decrease in cash and cash equivalents	-53,064		-193,703
Cash and cash equivalents at beginning of period	623,558	[1]	788,822
Cash and cash equivalents at end of period	570,494		595,119
Supplemental disclosure of cash flow information:
Interest paid	18,651		18,651
Income taxes paid, net of refunds	$65,903		$5,822
[1]	Derived from audited financial statements

Basis_of_Presentation

Basis of Presentation	6 Months Ended
	Sep. 28, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	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 30, 2013. 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 March 29, 2014 or any future period.
	The Company uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2014 and 2013 are a 52-week year ending on March 29, 2014 and March 30, 2013, respectively. The quarters ended September 28, 2013 and September 29, 2012 each included 13 weeks.

Recent_Accounting_Changes_and_

Recent Accounting Changes and Accounting Pronouncements	6 Months Ended
	Sep. 28, 2013
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Changes and Accounting Pronouncements	Recent Accounting Changes and Accounting Pronouncements
	The Company adopted the authoritative guidance, established by the Financial Accounting Standards Board (FASB), that sets requirements for presentation for significant items reclassified out of the accumulated other comprehensive income to net income in their entirety during the period, and for items not reclassified to net income in their entirety during the period. This guidance does not affect the underlying accounting for components of other comprehensive income.

Significant_Customers_and_Conc

Significant Customers and Concentrations of Credit Risk	6 Months Ended
	Sep. 28, 2013
Risks and Uncertainties [Abstract]
Significant Customers and Concentrations of Credit Risk	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 28, 2013 and March 30, 2013, Avnet accounted for 64% of the Company’s total net accounts receivable for both periods. Resale of product through Avnet accounted for 47% and 48% of the Company’s worldwide net revenues in the second quarter and the first six months of fiscal 2014, respectively. For the second quarter and the first six months of fiscal 2013, resale of product through Avnet accounted for 44% and 45% of the Company’s worldwide net revenues, respectively. The percentage of accounts receivable due from Avnet and the percentage of worldwide net revenues from Avnet are consistent with historical patterns.
	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 condensed 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 distributors.
	No end customer accounted for more than 10% of net revenues for the second quarter of fiscal 2014 as well as the first six months of fiscal 2014 and 2013. One end customer accounted for 11% of the Company's worldwide net revenues for the second quarter of fiscal 2013.
	The Company mitigates concentrations of credit risk in its investments in debt securities by currently investing more than 87% 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 28, 2013, approximately 32% 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.
	The global credit and capital markets have continued to experience adverse conditions that have negatively impacted the values of various types of investment and non-investment grade securities, and have experienced volatility and disruption due to instability in the global financial system, uncertainty related to global economic conditions and concerns regarding sovereign financial stability. Therefore, there is a risk that the Company may incur other-than-temporary impairment charges for certain types of investments should credit market conditions deteriorate or the underlying assets fail to perform as anticipated. See "Note 5. Financial Instruments" for a table of the Company’s available-for-sale securities.

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Sep. 28, 2013
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	The guidance for fair value measurements established by 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 analyses. 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 2014 and the Company did not adjust or override any fair value measurements as of September 28, 2013.
	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 bank certificates of deposit, commercial paper, corporate bonds, municipal bonds, U.S. agency securities, foreign government and agency securities, mortgage-backed securities and a debt mutual fund. 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 and the embedded derivative related to the Company's debentures.
	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 28, 2013 and March 30, 2013:
		September 28, 2013
	(In thousands)	Quoted			Significant		Significant			Total Fair
		Prices in			Other		Unobservable			Value
		Active			Observable		Inputs
		Markets for			Inputs		(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets
	Cash equivalents:
	Money market funds	$	168,053		$	—	$	—		$	168,053
	Bank certificates of deposit	—			29,997		—			29,997
	Commercial paper	—			222,987		—			222,987
	U.S. government and agency securities	25,000			—		—			25,000
	Foreign government and agency securities	—			79,997		—			79,997
	Short-term investments:
	Bank certificates of deposit	—			64,979		—			64,979
	Commercial paper	—			359,361		—			359,361
	Corporate bonds	—			57,276		—			57,276
	Municipal bonds	—			8,757		—			8,757
	U.S. government and agency securities	632,517			186,250		—			818,767
	Foreign government and agency securities	—			239,963		—			239,963
	Mortgage-backed securities	—			144,468		—			144,468
	Long-term investments:
	Corporate bonds	—			242,670		—			242,670
	Auction rate securities	—			—		22,636			22,636
	Municipal bonds	—			19,837		—			19,837
	U.S. government and agency securities	32,184			48,305		—			80,489
	Mortgage-backed securities	—			1,012,206		—			1,012,206
	Debt mutual fund	—			58,943		—			58,943
	Derivative financial instruments, net	—			512		—			512
	Total assets measured at fair value	$	857,754		$	2,776,508	$	22,636		$	3,656,898
	Liabilities
	Convertible debentures — embedded derivative	$	—		$	—	$	407		$	407
	Total liabilities measured at fair value	$	—		$	—	$	407		$	407
	Net assets measured at fair value	$	857,754		$	2,776,508	$	22,229		$	3,656,491
		30-Mar-13
	(In thousands)	Quoted			Significant		Significant			Total Fair
		Prices in			Other		Unobservable			Value
		Active			Observable		Inputs
		Markets for			Inputs		(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets
	Cash equivalents:
	Money market funds	$	108,311		$	—	$	—		$	108,311
	Bank certificates of deposit	—			79,995		—			79,995
	Commercial paper	—			208,667		—			208,667
	U.S. government and agency securities	95,039			—		—			95,039
Foreign government and agency securities	—			54,989		—			54,989
Short-term investments:
Bank certificates of deposit	—			44,992		—			44,992
Commercial paper	—			294,883		—			294,883
Corporate bonds	—			40,728		—			40,728
Municipal bonds	—			3,706		—			3,706
U.S. government and agency securities	416,887			75,011		—			491,898
Foreign government and agency securities	—			214,912		—			214,912
Mortgage-backed securities	—			68		—			68
Long-term investments:
Corporate bonds	—			235,275		—			235,275
Auction rate securities	—			—		28,700			28,700
Municipal bonds	—			21,234		—			21,234
U.S. government and agency securities	55,142			55,143		—			110,285
Mortgage-backed securities	—			1,192,612		—			1,192,612
Debt mutual fund	—			62,927		—			62,927
Total assets measured at fair value	$	675,379		$	2,585,142	$	28,700		$	3,289,221
Liabilities
Derivative financial instruments, net	$	—		$	1,615	$	—		$	1,615
Convertible debentures — embedded derivative	—			—		1,090			1,090
Total liabilities measured at fair value	$	—		$	1,615	$	1,090		$	2,705
Net assets measured at fair value	$	675,379		$	2,583,527	$	27,610		$	3,286,516
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 28, 2013			September 29, 2012		September 28, 2013			September 29, 2012
Balance as of beginning of period	$	28,081		$	27,270	$	27,610		$	27,998
Total realized and unrealized gains (losses):
Included in interest and other expense, net	758			—		683			(614		)
Included in other comprehensive income	(260		)	254		586			490
Sales and settlements, net	(6,350		)	—		(6,650		)	(350		)
Balance as of end of period	$	22,229		$	27,524	$	22,229		$	27,524
The amount of total gains (losses) included in net income attributable to the change in unrealized gains (losses) relating to assets and liabilities still held as of the end of the period was as follows:
	Three Months Ended					Six Months Ended
(In thousands)	September 28, 2013			September 29, 2012		September 28, 2013			September 29, 2012
Interest and other expense, net	$	758		$	—	$	683		$	(614	)
As of September 28, 2013, there were no material change to the input assumptions of the pricing model for the student loan auction rate securities as compared to the assumptions used as of our last fiscal year end. The valuation methodology was consistent with prior year.
The 3.125% Junior Convertible Debentures due March 15, 2037 (3.125% Debentures) included embedded features that qualify as an embedded derivative, and was separately accounted for as a discount on the 3.125% Debentures. Its fair value was established at the inception of the 3.125% Debentures. Each quarter, the change in the fair value of the embedded derivative, if any, is recorded in the condensed consolidated statements of income. The Company uses a derivative valuation model to derive the value of the embedded derivative. Key inputs into this valuation model are the Company’s current stock price, risk-free interest rates, the stock dividend yield, the stock volatility and the 3.125% Debenture’s credit spread over London Interbank Offered Rate (LIBOR). The first three inputs are based on observable market data and are considered Level 2 inputs while the last two inputs require management judgment and are Level 3 inputs.
Financial Instruments Not Recorded at Fair Value on a Recurring Basis
Our Senior Convertible Debentures due June 15, 2017 (2.625% Debentures) and 3.125% Debentures are measured at fair value on a quarterly basis for disclosure purposes. The fair value of the 2.625% and 3.125% Debentures as of September 28, 2013 were approximately $973.8 million and $1.11 billion, 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. 28, 2013
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 28, 2013													30-Mar-13
	(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	$	168,053		$	—		$	—		$	168,053			$	108,311		$	—	$	—		$	108,311
	Bank certificates of deposit	94,976			—			—			94,976				124,987			—		—			124,987
	Commercial paper	582,348			—			—			582,348				503,550			—		—			503,550
	Corporate bonds	299,100			2,823			(1,977		)	299,946				270,945			5,193		(135		)	276,003
	Auction rate securities	25,150			—			(2,514		)	22,636				31,900			—		(3,200		)	28,700
	Municipal bonds	28,592			371			(369		)	28,594				24,496			514		(70		)	24,940
	U.S. government and
	agency securities	924,072			401			(217		)	924,256				696,836			431		(45		)	697,222
	Foreign government and
	agency securities	319,960			—			—			319,960				269,901			—		—			269,901
	Mortgage-backed securities	1,158,484			10,830			(12,640		)	1,156,674				1,180,156			17,601		(5,077		)	1,192,680
	Debt mutual fund	61,350			—			(2,407		)	58,943				61,350			1,577		—			62,927
		$	3,662,085		$	14,425		$	(20,124	)	$	3,656,386			$	3,272,432		$	25,316	$	(8,527	)	$	3,289,221
	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 28, 2013 and March 30, 2013:
		September 28, 2013
		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
	Corporate bonds	$	127,859		$	(1,977	)	$	—		$	—		$	127,859		$	(1,977	)
	Auction rate securities	—			—			22,636			(2,514		)	22,636			(2,514		)
	Municipal bonds	9,691			(341		)	862			(28		)	10,553			(369		)
	U.S. government and
	agency securities	212,267			(217		)	—			—			212,267			(217		)
	Mortgage-backed securities	610,583			(11,932		)	31,645			(708		)	642,228			(12,640		)
	Debt mutual fund	58,943			(2,407		)	—			—			58,943			(2,407		)
		$	1,019,343		$	(16,874	)	$	55,143		$	(3,250	)	$	1,074,486		$	(20,124	)
		30-Mar-13
		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
	Corporate bonds	$	27,114		$	(135	)	$	—		$	—		$	27,114		$	(135	)
	Auction rate securities	—			—			28,701			(3,200		)	28,701			(3,200		)
	Municipal bonds	8,927			(70		)	60			—			8,987			(70		)
	U.S. government and
	agency securities	388,696			(45		)	—			—			388,696			(45		)
	Mortgage-backed securities	367,561			(4,930		)	11,029			(147		)	378,590			(5,077		)
		$	792,298		$	(5,180	)	$	39,790		$	(3,347	)	$	832,088		$	(8,527	)
	The gross unrealized losses that had been outstanding for less than twelve months were primarily related to mortgage-backed securities, although the percentage of such losses to the total estimated fair value of the mortgage-backed securities was relatively insignificant. The gross unrealized losses that had been outstanding for more than twelve months were primarily related to failed auction rate securities, which was due to adverse conditions in the global credit markets during the past five years.
	The Company reviewed the investment portfolio and determined that the gross unrealized losses on these investments as of September 28, 2013 and March 30, 2013 were temporary in nature as evidenced by the fluctuations in the gross unrealized losses within the investment categories. Additionally, in the past several years a portion of the Company's investment in the auction rate securities were redeemed by the issuers at par. Furthermore, the aggregate of individual unrealized losses that had been outstanding for twelve months or more was not significant as of September 28, 2013 and March 30, 2013. 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 (bank certificates of deposit, commercial paper, corporate bonds, auction rate securities, municipal bonds, U.S. and foreign government and agency securities and 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 28, 2013
	(In thousands)	Amortized			Estimated
		Cost			Fair Value
	Due in one year or less	$	1,858,718		$	1,858,944
	Due after one year through five years	384,528			385,905
	Due after five years through ten years	252,551			254,235
	Due after ten years	936,885			930,306
		$	3,432,682		$	3,429,390
	As of September 28, 2013, $192.6 million of marketable debt securities with contractual maturities of greater than one year was 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 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Proceeds from sale of available-for-sale securities	$	104,021		$	119,058		$	199,160		$	201,163
	Gross realized gains on sale of available-for-sale securities	$	266		$	1,042		$	1,367		$	1,829
	Gross realized losses on sale of available-for-sale securities	(521		)	(12		)	(1,515		)	(88		)
	Net realized gains (losses) on sale of available-for-sale securities	$	(255	)	$	1,030		$	(148	)	$	1,741
	Amortization of premiums on available-for-sale securities	$	6,904		$	5,942		$	14,063		$	11,561
	The cost of securities matured or sold is based on the specific identification method.

Derivative_Financial_Instrumen

Derivative Financial Instruments	6 Months Ended
	Sep. 28, 2013
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 28, 2013 and March 30, 2013, the Company had the following outstanding forward currency exchange contracts (in notional amount), which are derivative financial instruments:
	(In thousands and U.S. dollars)	September 28, 2013				30-Mar-13
	Singapore Dollar	$	62,688			$	70,197
	Euro	40,200				39,865
	Indian Rupee	14,573				16,941
	British Pound	9,599				11,602
	Japanese Yen	9,578				10,891
		$	136,638			$	149,496
	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 between October 2013 and August 2015. The net unrealized gain or loss, which approximates the fair market value of the above contracts, is expected to be realized and reclassified into net income within the next two years.
	As of September 28, 2013, 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 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 28, 2013 that is expected to be reclassified into earnings within the next twelve months 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 condensed consolidated statements of income as they are incurred.
	The 3.125% Debentures include provisions which qualify as an embedded derivative. See "Note 4. Fair Value Measurements" for more discussion about the embedded derivative. The fair value of the embedded derivative was $407 thousand and $1.1 million as of September 28, 2013 and March 30, 2013, respectively. The changes in the fair value of the embedded derivative were recorded to interest and other expense, net, on the Company’s condensed consolidated statements of income.
	The Company had the following derivative instruments (forward foreign currency exchange contracts) as of September 28, 2013 and March 30, 2013, 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 28, 2013	Prepaid expenses and other current assets		$	2,422			Other accrued liabilities	$	1,910
	30-Mar-13	Prepaid expenses and other current assets		$	1,179			Other accrued liabilities	$	2,794
	The following table summarizes the effect of derivative instruments on the condensed consolidated statements of income for second quarter and the first six months of fiscal 2014 and 2013:
		Three Months Ended							Six Months Ended
	(In thousands)	September 28, 2013				September 29, 2012			September 28, 2013			September 29, 2012
	Amount of gain recognized in other comprehensive income on derivative (effective portion of cash flow hedging)	$	2,742			$	7,968		$	1,940		$	5,505
	Amount of loss reclassified from	$	(1,389	)		$	(1,833	)	$	(2,095	)	$	(2,992	)
	accumulated other comprehensive income into income
	(effective portion) *
	Amount of gain recorded (ineffective portion) *	$	24			$	8		$	7		$	7
	*	Recorded in Interest and Other Expense location within the condensed consolidated statements of income

StockBased_Compensation_Plans

Stock-Based Compensation Plans	6 Months Ended
	Sep. 28, 2013
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 1990 Employee Qualified Stock Purchase Plan (ESPP):
		Three Months Ended								Six Months Ended
	(In thousands)	September 28, 2013				September 29, 2012				September 28, 2013				September 29, 2012
	Stock-based compensation included in:
	Cost of revenues	$	1,858			$	1,473			$	3,662			$	3,201
	Research and development	11,343				9,404				21,562				18,027
	Selling, general and administrative	9,859				8,369				18,790				15,626
		$	23,060			$	19,246			$	44,014			$	36,854
	During the first six months of fiscal 2014 and 2013, the tax benefits realized for the tax deduction from option exercises and other awards credited to additional paid-in capital were $16.4 million and $3.3 million, respectively.
	The fair values of stock options and stock purchase plan rights under the Company’s equity incentive plans and ESPP were estimated as of the grant date using the Black-Scholes option pricing model. The Company’s expected stock price volatility assumption for stock options is estimated using implied volatility of the Company’s traded options. The expected life of options granted is based on the historical exercise activity as well as the expected disposition of all options outstanding. The expected life of options granted also considers the actual contractual term. The weighted-average fair value per share of stock options granted during the first six months of fiscal 2014 and 2013 was $6.06 and $6.35, respectively. No options were granted in the second quarter of fiscal 2014. These fair values per share were estimated at the date of grant using the following weighted-average assumptions:
			Three Months Ended						Six Months Ended
			September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Expected life of options (years)		—			4.9			4.7			4.9
	Expected stock price volatility		—	%		29	%		24	%		29	%
	Risk-free interest rate		—	%		0.7	%		0.9	%		0.7	%
	Dividend yield		—	%		2.6	%		2.6	%		2.6	%
	The estimated fair values of restricted stock unit (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 values of RSUs granted during the second quarter of fiscal 2014 was $37.81 ($31.12 for the second quarter of fiscal 2013), and for the first six months of fiscal 2014 was $37.63 ($31.57 for the first six months of fiscal 2013), which were calculated based on estimates at the date of grant using the following weighted-average assumptions:
		Three Months Ended						Six Months Ended
		September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Risk-free interest rate	0.7	%		0.4	%		0.7	%		0.4	%
	Dividend yield	2.5	%		2.7	%		2.5	%		2.7	%
	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
	31-Mar-12	17,788			$	28.32
	Granted	92			$	33.83
	Exercised	(3,564	)		$	24.68
	Forfeited/cancelled/expired	(1,563	)		$	39.54
	30-Mar-13	12,753			$	28.01
	Granted	5			$	38.99
	Exercised	(4,376	)		$	29.09
	Forfeited/cancelled/expired	(45	)		$	33.44
	September 28, 2013	8,337			$	27.4
	Options exercisable at:
	September 28, 2013	7,678			$	27.28
	March 30, 2013	11,639			$	28.07
	The types of awards allowed under the 2007 Equity Incentive Plan (2007 Equity Plan) include incentive stock options, non-qualified stock options, RSUs, 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. On August 14, 2013, the stockholders approved an amendment to increase the authorized number of shares reserved for issuance under the 2007 Equity Plan by 2.0 million shares and to extend the term of the 2007 Equity Plan to December 31, 2023. As of September 28, 2013, 15.6 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 28, 2013 was $52.5 million and $65.3 million, respectively. The total pre-tax intrinsic value of options exercised during the three months and six months ended September 29, 2012 was $7.8 million and $11.7 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.
	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
	31-Mar-12	5,239			$	29.01
	Granted	3,018			$	31.58
	Vested	(1,778	)		$	27.01
	Cancelled	(483	)		$	29.69
	30-Mar-13	5,996			$	30.83
	Granted	2,562			$	37.63
	Vested	(1,600	)		$	29.18
	Cancelled	(170	)		$	31.38
	September 28, 2013	6,788			$	33.77
	Employee Stock Purchase Plan
	Under the ESPP, shares are only issued during the second and fourth quarters of each fiscal year. Employees purchased 529 thousand shares for $14.6 million during the second quarter of fiscal 2014 and 521 thousand shares for $14.1 million in the second quarter of fiscal 2013. The per-share weighted-average fair value of stock purchase rights granted under the ESPP during the second quarter of fiscal 2014 and 2013 was $11.24 and $8.53, respectively. The fair values of stock purchase plan rights granted in the second quarter of fiscal 2014 and 2013 were estimated at the date of grant using the following assumptions:
		2014			2013
	Expected life of options (years)	1.25			1.25
	Expected stock price volatility	23	%		29	%
	Risk-free interest rate	0.2	%		0.2	%
	Dividend yield	2.1	%		2.7	%
	The next scheduled purchase under the ESPP is in the fourth quarter of fiscal 2014. On August 14, 2013, the stockholders approved an amendment to increase the authorized number of shares reserved for issuance under the ESPP by 2.0 million shares. As of September 28, 2013, 10.4 million shares were available for future issuance out of 50.5 million shares authorized.

Net_Income_Per_Common_Share

Net Income Per Common Share	6 Months Ended
	Sep. 28, 2013
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 total shares used in the denominator of the diluted net income per common share calculation included 15.5 million and 13.3 million potentially dilutive common equivalent shares outstanding for the second quarter and the first six months of fiscal 2014, respectively, that are not included in basic net income per common share by applying the treasury stock method to the impact of incremental shares issuable assuming conversion of the debentures (see "Note 10. Convertible Debentures and Revolving Credit Facility"). For the second quarter and the first six months of fiscal 2013, the total shares used in the denominator of the diluted net income per common share calculation included 5.5 million and 5.8 million, respectively, that are not included in basic net income per common share by applying the treasury stock method to the impact of incremental shares issuable assuming conversion of the debentures.
	Additionally, the total shares used in the denominator of the diluted net income per common share calculation includes 6.7 million and 5.6 million potentially dilutive common equivalent shares outstanding for the second quarter and the first six months of fiscal 2014, respectively, that are not included in basic net income per common share. For the second quarter and the first six months of fiscal 2013, the total shares used in the denominator of the diluted net income per common share calculation included 4.1 million and 4.3 million potentially dilutive common equivalent shares, respectively. Potentially dilutive common equivalent shares are determined by applying the treasury stock method to the impact of incremental shares issuable assuming exercise of outstanding stock options and warrants, vesting of outstanding RSUs and issuance of common stock under the ESPP.
	Outstanding stock options and RSUs to purchase approximately 1.4 million and 3.7 million shares for the second quarter and for the first six months of fiscal 2014, respectively, under the Company’s stock award plans 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 2.625% Debentures, the Company also purchased call options on its common stock from the hedge counterparties. The call options give the Company the right to purchase up to 20.0 million shares of its common stock at $29.97 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 2.625% Debentures and potentially reduce the weighted number of diluted shares used in per share calculations.

Inventories

Inventories	6 Months Ended
	Sep. 28, 2013
Inventory Disclosure [Abstract]
Inventories	Inventories
	Inventories are stated at the lower of actual cost (determined using the first-in, first-out method), or market (estimated net realizable value) and are comprised of the following:
	(In thousands)	September 28, 2013		30-Mar-13
	Raw materials	$	12,851	$	12,484
	Work-in-process	148,506		165,034
	Finished goods	22,351		23,732
		$	183,708	$	201,250

Convertible_Debentures_and_Rev

Convertible Debentures and Revolving Credit Facility	6 Months Ended
	Sep. 28, 2013
Debt Disclosure [Abstract]
Convertible Debentures and Revolving Credit Facility	Convertible Debentures and Revolving Credit Facility
	2.625% Senior Convertible Debentures
	As of September 28, 2013, the Company had $600.0 million principal amount of 2.625% Debentures outstanding. The 2.625% Debentures 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 2.625% Debentures, including the 3.125% Debentures described below.
	The 2.625% Debentures are convertible, subject to certain conditions, into shares of Xilinx common stock at a conversion price of 33.3681 shares of common stock per $1 thousand principal amount of the 2.625% Debentures, representing an effective conversion price of approximately $29.97 per share of common stock. One of the conditions allowing holders of the 2.625% Debentures 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 28, 2013 and as a result, the 2.625% Debentures were convertible at the option of the holders. As of September 28, 2013 the 2.625% Debentures 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 2.625% Debentures 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 2.625% Debentures.
	The conversion rate is subject to adjustment for certain events as outlined in the indenture governing the 2.625% Debentures but will not be adjusted for accrued interest.
	The carrying values of the liability and equity components of the 2.625% Debentures are reflected in the Company’s condensed consolidated balance sheets as follows:
	(In thousands)	September 28, 2013			30-Mar-13
	Liability component:
	Principal amount of the 2.625% Debentures	$	600,000		$	600,000
	Unamortized discount of liability component	(56,995		)	(64,767		)
	Hedge accounting adjustment – sale of interest rate swap	16,470			18,716
	Net carrying value of the 2.625% Debentures	$	559,475		$	553,949
	Equity component (including temporary equity) – net carrying value	$	66,415		$	66,415
	Interest expense related to the 2.625% Debentures 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 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	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 2.625% Debentures	$	7,063		$	7,063		$	14,125		$	14,125
	3.125% Junior Subordinated Convertible Debentures
	As of September 28, 2013, the Company had $689.6 million principal amount of 3.125% Debentures outstanding. The 3.125% Debentures are subordinated in right of payment to the Company’s existing and future senior debt, including the 2.625% Debentures, and to the other liabilities of the Company’s subsidiaries.
	The 3.125% Debentures are convertible, subject to certain conditions, into shares of Xilinx common stock at a conversion price of 34.2957 shares of common stock per $1 thousand principal amount of 3.125% Debentures, representing an effective conversion price of approximately $29.16 per share of common stock. One of the conditions allowing holders of the 3.125% Debentures 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 28, 2013 and as a result, the 3.125% Debentures were convertible at the option of the holders. As of September 28, 2013 the 3.125% Debentures 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 3.125% Debentures 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 3.125% Debentures.
	The conversion rate is subject to adjustment for certain events as outlined in the indenture governing the 3.125% Debentures but will not be adjusted for accrued interest.
	The carrying values of the liability and equity components of the 3.125% Debentures are reflected in the Company’s condensed consolidated balance sheets as follows:
	(In thousands)	September 28, 2013			30-Mar-13
	Liability component:
	Principal amount of the 3.125% Debentures	$	689,635		$	689,635
	Unamortized discount of liability component	(318,073		)	(320,620		)
	Unamortized discount of embedded derivative from date of issuance	(1,359		)	(1,388		)
	Carrying value of liability component – 3.125% Debentures	370,203			367,627
	Carrying value of embedded derivative component	407			1,090
	Net carrying value of the 3.125% Debentures	$	370,610		$	368,717
	Equity component (including temporary equity) – net carrying value	$	229,513		$	229,513
	Interest expense related to the 3.125% Debentures was included in interest and other expense, net on the condensed consolidated statements of income and was recognized as follows:
		Three Months Ended						Six Months Ended
	(In thousands)	September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Contractual coupon interest	$	5,388		$	5,388		$	10,776		$	10,776
	Amortization of debt issuance costs	55			55			112			112
	Amortization of embedded derivative	14			14			29			29
	Amortization of debt discount	1,285			1,196			2,547			2,371
	Fair value adjustment of embedded derivative	(758		)	—			(683		)	614
	Total interest expense related to the 3.125% Debentures	$	5,984		$	6,653		$	12,781		$	13,902
	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 28, 2013, the Company had made no borrowings under this credit facility and was not in violation of any of the covenants.

Common_Stock_Repurchase_Progra

Common Stock Repurchase Program	6 Months Ended
	Sep. 28, 2013
Common Stock Repurchase Program [Abstract]
Common Stock Repurchase Program	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 August 2012, the Board authorized the repurchase of an additional $750.0 million of the Company's common stock and debentures (2012 Repurchase Program). The 2012 Repurchase Program has no stated expiration date.
	Through September 28, 2013, the Company had used $80.5 million of the $750.0 million authorized under the 2012 Repurchase Program, leaving $669.5 million available for future repurchases. The Company’s current policy is to retire all repurchased shares and debentures, and consequently, no treasury shares or debentures were held as of September 28, 2013 and March 30, 2013.
	During the first six months of fiscal 2014, the Company repurchased 1.5 million shares of common stock in the open market for a total of $70.0 million. During the first six months of fiscal 2013, the Company repurchased 5.6 million shares of common stock for a total of $178.1 million.

Interest_and_Other_Expense_Net

Interest and Other Expense, Net	6 Months Ended
	Sep. 28, 2013
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 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Interest income	$	5,363		$	6,271		$	10,966		$	12,063
	Interest expense	(13,047		)	(13,717		)	(26,906		)	(28,027		)
	Other expense, net	(3,313		)	(2,557		)	(4,987		)	(3,711		)
		$	(10,997	)	$	(10,003	)	$	(20,927	)	$	(19,675	)

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	6 Months Ended
	Sep. 28, 2013
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income
	The components of accumulated other comprehensive income (loss) are as follows:
	(In thousands)	September 28, 2013			30-Mar-13
	Accumulated unrealized gain (loss) on available-for-sale securities, net of tax	$	(3,578	)	$	10,519
	Accumulated unrealized gain (loss) on hedging transactions, net of tax	572			(1,368		)
	Accumulated cumulative translation adjustment	(1,555		)	(491		)
	Accumulated other comprehensive income (loss)	$	(4,561	)	$	8,660
	The related tax effects of other comprehensive income (loss) were not material for all periods presented.

Income_Taxes

Income Taxes	6 Months Ended
	Sep. 28, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The Company recorded tax provisions of $11.3 million and $37.3 million for the second quarter and the first six months of fiscal 2014, respectively, representing effective tax rates of 7% and 11%, respectively. The Company recorded tax provisions of $14.6 million and $39.7 million for the second quarter and the first six months of fiscal 2013, respectively, representing effective tax rates of 11% and 14%, 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.
	During the six-month period ended September 28, 2013, there was a decrease in current deferred tax assets, an increase in current deferred tax liabilities and a decrease in long-term deferred tax liabilities. These changes in deferred tax assets and liabilities primarily related to the reclassification of the Company's debentures from long-term liabilities and additional paid-in capital to current liabilities and temporary equity. See "Note 10. Convertible Debentures and Revolving Credit Facility" for further disclosure of the underlying changes. In addition, there was a significant U.S. federal tax payment which reduced the income taxes payable balance.
	The Company’s total gross unrecognized tax benefits as of September 28, 2013, determined in accordance with FASB authoritative guidance for measuring uncertain tax positions, decreased by $36.0 million in the second quarter of fiscal 2014 to $34.1 million. The decrease was primarily attributable to reductions in positions for prior years as a result of proposed regulations released on September 5, 2013, which provided clarification on the treatment of research expenditures. Due to the clarification, certain aspects of the U.S. Federal and state research credit calculations and certain related expenses were determined to meet the more likely than not threshold for recording an uncertain tax benefit. The total amount of unrecognized tax benefits that, if realized in a future period, would favorably affect the effective tax rate was $12.1 million as of September 28, 2013. 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 2009. The Company is no longer subject to U.S. state audits for years through fiscal 2004, except for fiscal years 1996 through 2001 which are still open for audit purposes. The Company is no longer subject to tax audits in Ireland for years through fiscal 2008.

Commitments

Commitments	6 Months Ended
	Sep. 28, 2013
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)
	2014 (remaining six months)	$	2,881
	2015	4,472
	2016	3,026
	2017	2,295
	2018	3,114
	Thereafter	5,110
	Total	$	20,898
	Aggregate future rental income to be received, which includes rents from both owned and leased property, totaled $6.1 million as of September 28, 2013. Rent expense, net of rental income, under all operating leases was $725 thousand and $1.5 million for the second quarter and the first six months of fiscal 2014, respectively. Rent expense, net of rental income, under all operating leases was $1.3 million and $2.1 million for the second quarter and the first six months of fiscal 2013, respectively. Rental income was not material for the second quarter and the first six months of fiscal 2014 or 2013.
	Other commitments as of September 28, 2013 totaled $105.7 million and consisted of purchases of inventory and other non-cancelable purchase obligations related to subcontractors that manufacture silicon wafers and provide assembly and some 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 28, 2013, the Company also had $16.6 million of non-cancelable license obligations to providers of electronic design automation software and hardware/software maintenance expiring at various dates through September 2016.
	The Company committed up to $5.0 million to acquire, in the future, rights to intellectual property (IP) until July 2023. License payments will be amortized over the useful life of the IP acquired.

Product_Warranty_and_Indemnifi

Product Warranty and Indemnification	6 Months Ended
	Sep. 28, 2013
Product Warranties Disclosures [Abstract]
Product Warranty and Indemnification	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 2014 and the end of fiscal 2013, the accrual balances of the product warranty liability were immaterial.
	The Company offers, subject to certain terms and conditions, to indemnify certain 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 IP 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. 28, 2013
Loss Contingency [Abstract]
Contingencies	Contingencies
	Patent Litigation
	On December 28, 2007, a patent infringement lawsuit was filed by PACT against the Company in the U.S. District Court for the Eastern District of Texas, Marshall Division (PACT XPP Technologies, AG. v. Xilinx, Inc. and Avnet, Inc. Case No. 2:07-CV-563). The lawsuit pertained to eleven different patents and PACT sought injunctive relief, damages including enhanced damages, interest and attorneys’ fees. Nine of the eleven patents were dismissed from the case prior to trial. Trial commenced in the matter on May 14, 2012 and on May 18, 2012 the jury concluded its deliberations. The jury found five claims of the two patents held by PACT were valid and were willfully infringed by the Company. The jury awarded PACT the sum of $15.4 million as damages and royalties on past Xilinx sales from March 2002 to May 2012. On August 30, 2013, a judge in the U.S. District Court for the Eastern District of Texas, Marshall Division, issued a memorandum order finding enhanced damages to be appropriate in the patent infringement suit brought against the Company. The judge’s order for enhanced damages adjusted the jury award to approximately $38.5 million on the basis of the judge’s consideration of applicable factors. On September 3, 2013, the court also issued an order requiring the Company to pay approximately $2.5 million for PACT’s costs and attorneys’ fees and an order requiring the Company to pay approximately $3.0 million for pre- and post-judgment interest. The court denied without prejudice PACT’s motion for ongoing royalties on Xilinx sales from May 2012 and onwards which are subject to the patents in suit, and ordered the parties to negotiate resolution of the future royalty rate on such Xilinx sales. Final judgment in the case was issued on September 4, 2013.
	As a result of the August 30, 2013 and September 3, 2013 orders, the Company recorded a charge of $28.6 million in the second quarter of fiscal year 2014. The Company is unable to estimate the possible range of loss regarding the ongoing and future royalties at this time. On October 2, 2013, the Company filed a Notice of Appeal with the U.S. District Court for the Eastern District of Texas, Marshall Division of its appeal to the U.S. Court of Appeals for the Federal Circuit.
	On February 14, 2011, the Company filed a complaint for declaratory judgment of patent non-infringement and invalidity against Intellectual Ventures in the U.S. District Court for the Northern District of California. On September 30, 2011, the Company amended its complaint in this case to eliminate certain defendants and patents from the action (Xilinx, Inc. v. Intellectual Ventures I LLC and Intellectual Ventures II LLC, Case No CV11-0671). The lawsuit pertains to one patent and seeks judgment of non-infringement by Xilinx and judgment that the patent is invalid and unenforceable, as well as costs and attorneys’ fees.
	On February 15, 2011, Intellectual Ventures added the Company as a defendant in its complaint for patent infringement previously filed against Altera, Microsemi and Lattice in the U.S. District Court for the District of Delaware (Intellectual Ventures I LLC and Intellectual Ventures II LLC v. Altera Corporation, Microsemi Corporation, Lattice Semiconductor Corporation and Xilinx, Inc., Case No. 10-CV-1065). The lawsuit pertains to five patents, four of which Xilinx is alleged to be infringing. Intellectual Ventures seeks unspecified damages, interest and attorneys’ fees and the proceedings are in their early stages. The Company is unable to estimate its range of possible loss in this matter at this time.
	On October 17, 2011, the Company filed a complaint for patent non-infringement and invalidity and violation of California Business and Professions Code Section 17200 in the U.S. District Court for the Northern District of California against Intellectual Ventures and related entities as well as additional defendants (Xilinx, Inc. v. Intellectual Ventures, LLC. Intellectual Ventures Management, LLC, Detelle Relay KG, LLC, Roldan Block NY LLC, Latrosse Technologies LLC, TR Technologies Foundation LLC, Taichi Holdings, LLC, Noregin Assets N.V., LLC and Intellectual Venture Funding LLC Case No CV-04407). By order dated January 25, 2012, the Court granted with leave to amend defendants' motion to dismiss the Company's claim for violation of California Business and Professions Code section 17200. The Company has amended its complaint to remove the claim for violation of California Business and Professions Code section 17200. The remainder of the lawsuit pertains to two patents and seeks judgments of non-infringement by the Company and judgments that the patents are invalid and unenforceable, as well as costs and attorneys’ fees.
	On May 30, 2012, a patent infringement lawsuit was filed by Semcon against the Company in the United States District Court for the District of Delaware (Semcon Tech, LLC v. Xilinx, Inc., Case No. 1:12-CV-00691). The lawsuit pertains to one patent and Semcon sought unspecified damages, costs and expenses. On August 5, 2013 the lawsuit was dismissed and the Company was indemnified by other parties involved in the action, therefore no payment was made by the Company in connection with the dismissal.
	On November 5, 2012, a patent infringement lawsuit was filed by Mosaid against the Company in the U.S. District Court for the Eastern District of Texas (Mosaid Technologies Inc. v. Xilinx, Inc., Case No. 6:12-CV-00847). The lawsuit pertains to five patents and Mosaid seeks unspecified damages, costs, fees, royalties and injunctive relief and the proceedings are in their early stages. The Company is unable to estimate its range of possible loss in this matter at this time.
	The Company intends to continue to protect and defend our IP vigorously.
	Other Matters
	Except as stated above, there are no pending legal proceedings of a material nature to which the Company is a party of which any of its property is the subject.
	From time to time, the Company is involved in various disputes and litigation matters that arise in the ordinary course of our business. These include disputes and lawsuits related to IP, 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 assess 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_AcquisitionRelate

Goodwill and Acquisition-Related Intangibles	6 Months Ended
	Sep. 28, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquisition-Related Intangibles	Goodwill and Acquisition-Related Intangibles
	As of September 28, 2013 and March 30, 2013, the gross and net amounts of goodwill and of acquisition-related intangibles for all acquisitions were as follows:
	(In thousands)	September 28, 2013			30-Mar-13			Weighted Average Amortization Life
	Goodwill	$	158,990		$	158,990
	Core technology, gross	89,360			89,360			5.8 years
	Less accumulated amortization	(58,578		)	(54,201		)
	Core technology, net	30,782			35,159
	Other intangibles, gross	46,516			46,516			2.7 years
	Less accumulated amortization	(46,079		)	(45,621		)
	Other intangibles, net	437			895
	Total acquisition-related intangibles, gross	135,876			135,876
	Less accumulated amortization	(104,657		)	(99,822		)
	Total acquisition-related intangibles, net	$	31,219		$	36,054
	Amortization expense for acquisition-related intangibles for the three and six months ended September 28, 2013 was $2.4 million and $4.8 million, respectively. Amortization expense for acquisition-related intangibles for the three and six months ended September 29, 2012 was $2.3 million and $4.5 million, respectively.
	Based on the carrying value of acquisition-related intangibles recorded as of September 28, 2013, 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)
	2014 (remaining six months)	$	4,707
	2015	8,845
	2016	8,244
	2017	6,473
	2018	2,347
	Thereafter	603
	Total	$	31,219

Subsequent_Event

Subsequent Event	6 Months Ended
	Sep. 28, 2013
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event
	On October 15, 2013, the Company’s Board of Directors declared a cash dividend of $0.25 per common share for the third quarter of fiscal 2014. The dividend is payable on November 27, 2013 to stockholders of record on November 6, 2013.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Sep. 28, 2013
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 28, 2013 and March 30, 2013:
		September 28, 2013
	(In thousands)	Quoted			Significant		Significant			Total Fair
		Prices in			Other		Unobservable			Value
		Active			Observable		Inputs
		Markets for			Inputs		(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets
	Cash equivalents:
	Money market funds	$	168,053		$	—	$	—		$	168,053
	Bank certificates of deposit	—			29,997		—			29,997
	Commercial paper	—			222,987		—			222,987
	U.S. government and agency securities	25,000			—		—			25,000
	Foreign government and agency securities	—			79,997		—			79,997
	Short-term investments:
	Bank certificates of deposit	—			64,979		—			64,979
	Commercial paper	—			359,361		—			359,361
	Corporate bonds	—			57,276		—			57,276
	Municipal bonds	—			8,757		—			8,757
	U.S. government and agency securities	632,517			186,250		—			818,767
	Foreign government and agency securities	—			239,963		—			239,963
	Mortgage-backed securities	—			144,468		—			144,468
	Long-term investments:
	Corporate bonds	—			242,670		—			242,670
	Auction rate securities	—			—		22,636			22,636
	Municipal bonds	—			19,837		—			19,837
	U.S. government and agency securities	32,184			48,305		—			80,489
	Mortgage-backed securities	—			1,012,206		—			1,012,206
	Debt mutual fund	—			58,943		—			58,943
	Derivative financial instruments, net	—			512		—			512
	Total assets measured at fair value	$	857,754		$	2,776,508	$	22,636		$	3,656,898
	Liabilities
	Convertible debentures — embedded derivative	$	—		$	—	$	407		$	407
	Total liabilities measured at fair value	$	—		$	—	$	407		$	407
	Net assets measured at fair value	$	857,754		$	2,776,508	$	22,229		$	3,656,491
		30-Mar-13
	(In thousands)	Quoted			Significant		Significant			Total Fair
		Prices in			Other		Unobservable			Value
		Active			Observable		Inputs
		Markets for			Inputs		(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets
	Cash equivalents:
	Money market funds	$	108,311		$	—	$	—		$	108,311
	Bank certificates of deposit	—			79,995		—			79,995
	Commercial paper	—			208,667		—			208,667
	U.S. government and agency securities	95,039			—		—			95,039
	Foreign government and agency securities	—			54,989		—			54,989
	Short-term investments:
	Bank certificates of deposit	—			44,992		—			44,992
	Commercial paper	—			294,883		—			294,883
	Corporate bonds	—			40,728		—			40,728
	Municipal bonds	—			3,706		—			3,706
	U.S. government and agency securities	416,887			75,011		—			491,898
	Foreign government and agency securities	—			214,912		—			214,912
	Mortgage-backed securities	—			68		—			68
	Long-term investments:
	Corporate bonds	—			235,275		—			235,275
	Auction rate securities	—			—		28,700			28,700
	Municipal bonds	—			21,234		—			21,234
U.S. government and agency securities	55,142			55,143		—			110,285
Mortgage-backed securities	—			1,192,612		—			1,192,612
Debt mutual fund	—			62,927		—			62,927
Total assets measured at fair value	$	675,379		$	2,585,142	$	28,700		$	3,289,221
Liabilities
Derivative financial instruments, net	$	—		$	1,615	$	—		$	1,615
Convertible debentures — embedded derivative	—			—		1,090			1,090
Total liabilities measured at fair value	$	—		$	1,615	$	1,090		$	2,705
Net assets measured at fair value	$	675,379		$	2,583,527	$	27,610		$	3,286,516
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 28, 2013			September 29, 2012		September 28, 2013			September 29, 2012
	Balance as of beginning of period	$	28,081		$	27,270	$	27,610		$	27,998
	Total realized and unrealized gains (losses):
	Included in interest and other expense, net	758			—		683			(614		)
	Included in other comprehensive income	(260		)	254		586			490
	Sales and settlements, net	(6,350		)	—		(6,650		)	(350		)
	Balance as of end of period	$	22,229		$	27,524	$	22,229		$	27,524
Gains or (losses) included in net income attributable to change in unrealized gains or losses relating to assets and liabilities	The amount of total gains (losses) included in net income attributable to the change in unrealized gains (losses) relating to assets and liabilities still held as of the end of the period was as follows:
		Three Months Ended					Six Months Ended
	(In thousands)	September 28, 2013			September 29, 2012		September 28, 2013			September 29, 2012
	Interest and other expense, net	$	758		$	—	$	683		$	(614	)

Financial_Instruments_Tables

Financial Instruments (Tables)	6 Months Ended
	Sep. 28, 2013
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 28, 2013													30-Mar-13
	(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	$	168,053		$	—		$	—		$	168,053			$	108,311		$	—	$	—		$	108,311
	Bank certificates of deposit	94,976			—			—			94,976				124,987			—		—			124,987
	Commercial paper	582,348			—			—			582,348				503,550			—		—			503,550
	Corporate bonds	299,100			2,823			(1,977		)	299,946				270,945			5,193		(135		)	276,003
	Auction rate securities	25,150			—			(2,514		)	22,636				31,900			—		(3,200		)	28,700
	Municipal bonds	28,592			371			(369		)	28,594				24,496			514		(70		)	24,940
	U.S. government and
	agency securities	924,072			401			(217		)	924,256				696,836			431		(45		)	697,222
	Foreign government and
	agency securities	319,960			—			—			319,960				269,901			—		—			269,901
	Mortgage-backed securities	1,158,484			10,830			(12,640		)	1,156,674				1,180,156			17,601		(5,077		)	1,192,680
	Debt mutual fund	61,350			—			(2,407		)	58,943				61,350			1,577		—			62,927
		$	3,662,085		$	14,425		$	(20,124	)	$	3,656,386			$	3,272,432		$	25,316	$	(8,527	)	$	3,289,221
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 28, 2013 and March 30, 2013:
		September 28, 2013
		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
	Corporate bonds	$	127,859		$	(1,977	)	$	—		$	—		$	127,859		$	(1,977	)
	Auction rate securities	—			—			22,636			(2,514		)	22,636			(2,514		)
	Municipal bonds	9,691			(341		)	862			(28		)	10,553			(369		)
	U.S. government and
	agency securities	212,267			(217		)	—			—			212,267			(217		)
	Mortgage-backed securities	610,583			(11,932		)	31,645			(708		)	642,228			(12,640		)
	Debt mutual fund	58,943			(2,407		)	—			—			58,943			(2,407		)
		$	1,019,343		$	(16,874	)	$	55,143		$	(3,250	)	$	1,074,486		$	(20,124	)
		30-Mar-13
		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
	Corporate bonds	$	27,114		$	(135	)	$	—		$	—		$	27,114		$	(135	)
	Auction rate securities	—			—			28,701			(3,200		)	28,701			(3,200		)
	Municipal bonds	8,927			(70		)	60			—			8,987			(70		)
	U.S. government and
	agency securities	388,696			(45		)	—			—			388,696			(45		)
	Mortgage-backed securities	367,561			(4,930		)	11,029			(147		)	378,590			(5,077		)
		$	792,298		$	(5,180	)	$	39,790		$	(3,347	)	$	832,088		$	(8,527	)
Amortized cost and estimated fair value of marketable debt securities
		September 28, 2013
	(In thousands)	Amortized			Estimated
		Cost			Fair Value
	Due in one year or less	$	1,858,718		$	1,858,944
	Due after one year through five years	384,528			385,905
	Due after five years through ten years	252,551			254,235
	Due after ten years	936,885			930,306
		$	3,432,682		$	3,429,390
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 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Proceeds from sale of available-for-sale securities	$	104,021		$	119,058		$	199,160		$	201,163
	Gross realized gains on sale of available-for-sale securities	$	266		$	1,042		$	1,367		$	1,829
	Gross realized losses on sale of available-for-sale securities	(521		)	(12		)	(1,515		)	(88		)
	Net realized gains (losses) on sale of available-for-sale securities	$	(255	)	$	1,030		$	(148	)	$	1,741
	Amortization of premiums on available-for-sale securities	$	6,904		$	5,942		$	14,063		$	11,561

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	6 Months Ended
	Sep. 28, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Forward currency exchange contracts outstanding	As of September 28, 2013 and March 30, 2013, the Company had the following outstanding forward currency exchange contracts (in notional amount), which are derivative financial instruments:
	(In thousands and U.S. dollars)	September 28, 2013				30-Mar-13
	Singapore Dollar	$	62,688			$	70,197
	Euro	40,200				39,865
	Indian Rupee	14,573				16,941
	British Pound	9,599				11,602
	Japanese Yen	9,578				10,891
		$	136,638			$	149,496
Derivative Instruments Located on Condensed Consolidated Balance Sheet	The Company had the following derivative instruments (forward foreign currency exchange contracts) as of September 28, 2013 and March 30, 2013, 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 28, 2013	Prepaid expenses and other current assets		$	2,422			Other accrued liabilities	$	1,910
	30-Mar-13	Prepaid expenses and other current assets		$	1,179			Other accrued liabilities	$	2,794
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 second quarter and the first six months of fiscal 2014 and 2013:
		Three Months Ended							Six Months Ended
	(In thousands)	September 28, 2013				September 29, 2012			September 28, 2013			September 29, 2012
	Amount of gain recognized in other comprehensive income on derivative (effective portion of cash flow hedging)	$	2,742			$	7,968		$	1,940		$	5,505
	Amount of loss reclassified from	$	(1,389	)		$	(1,833	)	$	(2,095	)	$	(2,992	)
	accumulated other comprehensive income into income
	(effective portion) *
	Amount of gain recorded (ineffective portion) *	$	24			$	8		$	7		$	7
	*	Recorded in Interest and Other Expense location within the condensed consolidated statements of income

StockBased_Compensation_Plans_

Stock-Based Compensation Plans (Tables)	6 Months Ended
	Sep. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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 2014 and 2013 were estimated at the date of grant using the following assumptions:
		2014			2013
	Expected life of options (years)	1.25			1.25
	Expected stock price volatility	23	%		29	%
	Risk-free interest rate	0.2	%		0.2	%
	Dividend yield	2.1	%		2.7	%
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 1990 Employee Qualified Stock Purchase Plan (ESPP):
		Three Months Ended								Six Months Ended
	(In thousands)	September 28, 2013				September 29, 2012				September 28, 2013				September 29, 2012
	Stock-based compensation included in:
	Cost of revenues	$	1,858			$	1,473			$	3,662			$	3,201
	Research and development	11,343				9,404				21,562				18,027
	Selling, general and administrative	9,859				8,369				18,790				15,626
		$	23,060			$	19,246			$	44,014			$	36,854
Weighted-average assumptions in estimation of fair value of stock options	These fair values per share were estimated at the date of grant using the following weighted-average assumptions:
			Three Months Ended						Six Months Ended
			September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Expected life of options (years)		—			4.9			4.7			4.9
	Expected stock price volatility		—	%		29	%		24	%		29	%
	Risk-free interest rate		—	%		0.7	%		0.9	%		0.7	%
	Dividend yield		—	%		2.6	%		2.6	%		2.6	%
Summary of restricted stock unit activity and related information	The per share weighted-average fair values of RSUs granted during the second quarter of fiscal 2014 was $37.81 ($31.12 for the second quarter of fiscal 2013), and for the first six months of fiscal 2014 was $37.63 ($31.57 for the first six months of fiscal 2013), which were calculated based on estimates at the date of grant using the following weighted-average assumptions:
		Three Months Ended						Six Months Ended
		September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Risk-free interest rate	0.7	%		0.4	%		0.7	%		0.4	%
	Dividend yield	2.5	%		2.7	%		2.5	%		2.7	%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	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
	31-Mar-12	17,788			$	28.32
	Granted	92			$	33.83
	Exercised	(3,564	)		$	24.68
	Forfeited/cancelled/expired	(1,563	)		$	39.54
	30-Mar-13	12,753			$	28.01
	Granted	5			$	38.99
	Exercised	(4,376	)		$	29.09
	Forfeited/cancelled/expired	(45	)		$	33.44
	September 28, 2013	8,337			$	27.4
	Options exercisable at:
	September 28, 2013	7,678			$	27.28
	March 30, 2013	11,639			$	28.07
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
	31-Mar-12	5,239			$	29.01
	Granted	3,018			$	31.58
	Vested	(1,778	)		$	27.01
	Cancelled	(483	)		$	29.69
	30-Mar-13	5,996			$	30.83
	Granted	2,562			$	37.63
	Vested	(1,600	)		$	29.18
	Cancelled	(170	)		$	31.38
	September 28, 2013	6,788			$	33.77

Inventories_Tables

Inventories (Tables)	6 Months Ended
	Sep. 28, 2013
Inventory Disclosure [Abstract]
Components of inventory	Inventories are stated at the lower of actual cost (determined using the first-in, first-out method), or market (estimated net realizable value) and are comprised of the following:
	(In thousands)	September 28, 2013		30-Mar-13
	Raw materials	$	12,851	$	12,484
	Work-in-process	148,506		165,034
	Finished goods	22,351		23,732
		$	183,708	$	201,250

Convertible_Debentures_and_Rev1

Convertible Debentures and Revolving Credit Facility (Tables)	6 Months Ended
	Sep. 28, 2013
2.625% Senior Convertible Debentures [Member]
Short-term Debt [Line Items]
Carrying values of liability and equity components of debentures	The carrying values of the liability and equity components of the 2.625% Debentures are reflected in the Company’s condensed consolidated balance sheets as follows:
	(In thousands)	September 28, 2013			30-Mar-13
	Liability component:
	Principal amount of the 2.625% Debentures	$	600,000		$	600,000
	Unamortized discount of liability component	(56,995		)	(64,767		)
	Hedge accounting adjustment – sale of interest rate swap	16,470			18,716
	Net carrying value of the 2.625% Debentures	$	559,475		$	553,949
	Equity component (including temporary equity) – net carrying value	$	66,415		$	66,415
Interest expense related to debentures	Interest expense related to the 2.625% Debentures 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 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	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 2.625% Debentures	$	7,063		$	7,063		$	14,125		$	14,125
3.125% Junior Convertible Debentures [Member]
Short-term Debt [Line Items]
Carrying values of liability and equity components of debentures	The carrying values of the liability and equity components of the 3.125% Debentures are reflected in the Company’s condensed consolidated balance sheets as follows:
	(In thousands)	September 28, 2013			30-Mar-13
	Liability component:
	Principal amount of the 3.125% Debentures	$	689,635		$	689,635
	Unamortized discount of liability component	(318,073		)	(320,620		)
	Unamortized discount of embedded derivative from date of issuance	(1,359		)	(1,388		)
	Carrying value of liability component – 3.125% Debentures	370,203			367,627
	Carrying value of embedded derivative component	407			1,090
	Net carrying value of the 3.125% Debentures	$	370,610		$	368,717
	Equity component (including temporary equity) – net carrying value	$	229,513		$	229,513
Interest expense related to debentures	Interest expense related to the 3.125% Debentures was included in interest and other expense, net on the condensed consolidated statements of income and was recognized as follows:
		Three Months Ended						Six Months Ended
	(In thousands)	September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Contractual coupon interest	$	5,388		$	5,388		$	10,776		$	10,776
	Amortization of debt issuance costs	55			55			112			112
	Amortization of embedded derivative	14			14			29			29
	Amortization of debt discount	1,285			1,196			2,547			2,371
	Fair value adjustment of embedded derivative	(758		)	—			(683		)	614
	Total interest expense related to the 3.125% Debentures	$	5,984		$	6,653		$	12,781		$	13,902

Recovered_Sheet1

Interest And Other Expense, Net (Tables)	6 Months Ended
	Sep. 28, 2013
Other Income and Expenses [Abstract]
Components of interest and other expense	The components of interest and other expense, net are as follows:
		Three Months Ended						Six Months Ended
	(In thousands)	September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Interest income	$	5,363		$	6,271		$	10,966		$	12,063
	Interest expense	(13,047		)	(13,717		)	(26,906		)	(28,027		)
	Other expense, net	(3,313		)	(2,557		)	(4,987		)	(3,711		)
		$	(10,997	)	$	(10,003	)	$	(20,927	)	$	(19,675	)

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Sep. 28, 2013
Equity [Abstract]
Components of accumulated other comprehensive income	The components of accumulated other comprehensive income (loss) are as follows:
	(In thousands)	September 28, 2013			30-Mar-13
	Accumulated unrealized gain (loss) on available-for-sale securities, net of tax	$	(3,578	)	$	10,519
	Accumulated unrealized gain (loss) on hedging transactions, net of tax	572			(1,368		)
	Accumulated cumulative translation adjustment	(1,555		)	(491		)
	Accumulated other comprehensive income (loss)	$	(4,561	)	$	8,660

Commitments_Tables

Commitments (Tables)	6 Months Ended
	Sep. 28, 2013
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)
	2014 (remaining six months)	$	2,881
	2015	4,472
	2016	3,026
	2017	2,295
	2018	3,114
	Thereafter	5,110
	Total	$	20,898

Goodwill_and_AcquisitionRelate1

Goodwill and Acquisition-Related Intangibles (Tables)	6 Months Ended
	Sep. 28, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Gross and net amounts of goodwill and of acquisition-related intangibles	As of September 28, 2013 and March 30, 2013, the gross and net amounts of goodwill and of acquisition-related intangibles for all acquisitions were as follows:
	(In thousands)	September 28, 2013			30-Mar-13			Weighted Average Amortization Life
	Goodwill	$	158,990		$	158,990
	Core technology, gross	89,360			89,360			5.8 years
	Less accumulated amortization	(58,578		)	(54,201		)
	Core technology, net	30,782			35,159
	Other intangibles, gross	46,516			46,516			2.7 years
	Less accumulated amortization	(46,079		)	(45,621		)
	Other intangibles, net	437			895
	Total acquisition-related intangibles, gross	135,876			135,876
	Less accumulated amortization	(104,657		)	(99,822		)
	Total acquisition-related intangibles, net	$	31,219		$	36,054
Schedule of expected annual amortization expense for acquisition-related intangibles	Based on the carrying value of acquisition-related intangibles recorded as of September 28, 2013, 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)
	2014 (remaining six months)	$	4,707
	2015	8,845
	2016	8,244
	2017	6,473
	2018	2,347
	Thereafter	603
	Total	$	31,219

Significant_Customers_and_Conc1

Significant Customers and Concentrations of Credit Risk (Details)	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Mar. 30, 2013
	Customer	Customer	Customer	Customer
Significant Customers and Concentrations of Credit Risk (Textual) [Abstract]
Percentage of total accounts receivable accounted from Avnet	64.00%		64.00%		64.00%
Percentage of net revenues through resale of product from Avnet	47.00%	44.00%	48.00%	45.00%
Number of end customers accounted for net revenues	0	1	0	0
Percentage of net revenues from end customer	10.00%	11.00%	10.00%	10.00%
Percentage of higher grade securities investment in debt securities			87.00%
Percentage of mortgage-backed securities in total investment portfolio	32.00%		32.00%

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Sep. 28, 2013	Mar. 30, 2013
In Thousands, unless otherwise specified
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Derivative asset	$512
Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Derivative asset	0
Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Derivative asset	512
Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Derivative asset	0
Fair Value, Measurements, Recurring [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	3,656,898	3,289,221
Derivative Liability		1,615
Fair Value Liabilities, Convertible debentures - embedded derivative	407	1,090
Total liabilities measured at fair value	407	2,705
Net assets measured at fair value	3,656,491	3,286,516
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	857,754	675,379
Derivative Liability		0
Fair Value Liabilities, Convertible debentures - embedded derivative	0	0
Total liabilities measured at fair value	0	0
Net assets measured at fair value	857,754	675,379
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	2,776,508	2,585,142
Derivative Liability		1,615
Fair Value Liabilities, Convertible debentures - embedded derivative	0	0
Total liabilities measured at fair value	0	1,615
Net assets measured at fair value	2,776,508	2,583,527
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	22,636	28,700
Derivative Liability		0
Fair Value Liabilities, Convertible debentures - embedded derivative	407	1,090
Total liabilities measured at fair value	407	1,090
Net assets measured at fair value	22,229	27,610
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
Total assets measured at fair value	168,053	108,311
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Bank Certificates of Deposit [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	29,997	79,995
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Commercial Paper [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	222,987	208,667
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
Total assets measured at fair value	25,000	95,039
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
Total assets measured at fair value	79,997	54,989
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
Total assets measured at fair value	168,053	108,311
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Bank Certificates of Deposit [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	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
Total assets measured at fair value	25,000	95,039
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
Total assets measured at fair value	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
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Certificates of Deposit [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	29,997	79,995
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	222,987	208,667
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
Total assets measured at fair value	0	0
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
Total assets measured at fair value	79,997	54,989
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
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Bank Certificates of Deposit [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	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
Total assets measured at fair value	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
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Bank Certificates of Deposit [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	64,979	44,992
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Commercial Paper [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	359,361	294,883
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Corporate Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	57,276	40,728
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	8,757	3,706
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
Total assets measured at fair value	818,767	491,898
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
Total assets measured at fair value	239,963	214,912
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	144,468	68
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Bank Certificates of Deposit [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	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
Total assets measured at fair value	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
Total assets measured at fair value	632,517	416,887
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
Total assets measured at fair value	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
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Certificates of Deposit [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	64,979	44,992
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	359,361	294,883
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	57,276	40,728
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
Total assets measured at fair value	8,757	3,706
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
Total assets measured at fair value	186,250	75,011
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
Total assets measured at fair value	239,963	214,912
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
Total assets measured at fair value	144,468	68
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Bank Certificates of Deposit [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	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
Total assets measured at fair value	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
Total assets measured at fair value	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
Total assets measured at fair value	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
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Corporate Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	242,670	235,275
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Auction Rate Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	22,636	28,700
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	19,837	21,234
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	80,489	110,285
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	1,012,206	1,192,612
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	58,943	62,927
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	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
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Long-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
Total assets measured at fair value	32,184	55,142
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
Total assets measured at fair value	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
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	242,670	235,275
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	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
Total assets measured at fair value	19,837	21,234
Fair Value, Measurements, Recurring [Member] | Long-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
Total assets measured at fair value	48,305	55,143
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
Total assets measured at fair value	1,012,206	1,192,612
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
Total assets measured at fair value	58,943	62,927
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total assets measured at fair value	22,636	28,700
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
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Long-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
Total assets measured at fair value	0	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
Total assets measured at fair value	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
Total assets measured at fair value	$0	$0

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 1) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Changes in Level 3 instruments measured at fair value on a recurring basis
Balance as of beginning of period	$28,081	$27,270	$27,610	$27,998
Included in interest and other expense, net	758	0	683	-614
Included in other comprehensive income	-260	254	586	490
Sales and settlements, net	-6,350	0	-6,650	-350
Balance as of end of period	$22,229	$27,524	$22,229	$27,524

Fair_Value_Measurements_Detail2

Fair Value Measurements (Details 2) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Fair Value Disclosures [Abstract]
Interest and other expense, net	$758	$0	$683	($614)

Fair_Value_Measurements_Detail3

Fair Value Measurements (Details Textual) (USD $)	Sep. 28, 2013	Mar. 30, 2013	Mar. 31, 2007	Sep. 28, 2013	Sep. 28, 2013	Sep. 28, 2013	Mar. 30, 2013
			3.125% Junior Convertible Debentures [Member]	3.125% Junior Convertible Debentures [Member]	2.625% Senior Convertible Debentures [Member]	Auction Rate Securities [Member]	Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$3,656,386,000	$3,289,221,000				$22,636,000	$28,700,000
Debt Instruments [Abstract]
Interest rate of debentures	3.13%		3.13%		2.63%
Convertible debentures due date			15-Mar-37
Fair value of debentures				$1,110,000,000	$973,800,000

Financial_Instruments_Details

Financial Instruments (Details) (USD $)	Sep. 28, 2013	Mar. 30, 2013
In Thousands, unless otherwise specified
Available-for-sale securities
Amortized Cost	$3,662,085	$3,272,432
Gross Unrealized Gains	14,425	25,316
Gross Unrealized Losses	-20,124	-8,527
Estimated Fair Value	3,656,386	3,289,221
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	168,053	108,311
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	168,053	108,311
Bank Certificates of Deposit [Member]
Available-for-sale securities
Amortized Cost	94,976	124,987
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	94,976	124,987
Commercial Paper [Member]
Available-for-sale securities
Amortized Cost	582,348	503,550
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	582,348	503,550
Corporate Bonds [Member]
Available-for-sale securities
Amortized Cost	299,100	270,945
Gross Unrealized Gains	2,823	5,193
Gross Unrealized Losses	-1,977	-135
Estimated Fair Value	299,946	276,003
Auction Rate Securities [Member]
Available-for-sale securities
Amortized Cost	25,150	31,900
Gross Unrealized Gains	0	0
Gross Unrealized Losses	-2,514	-3,200
Estimated Fair Value	22,636	28,700
Municipal Bonds [Member]
Available-for-sale securities
Amortized Cost	28,592	24,496
Gross Unrealized Gains	371	514
Gross Unrealized Losses	-369	-70
Estimated Fair Value	28,594	24,940
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	924,072	696,836
Gross Unrealized Gains	401	431
Gross Unrealized Losses	-217	-45
Estimated Fair Value	924,256	697,222
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	319,960	269,901
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	319,960	269,901
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	1,158,484	1,180,156
Gross Unrealized Gains	10,830	17,601
Gross Unrealized Losses	-12,640	-5,077
Estimated Fair Value	1,156,674	1,192,680
Debt Mutual Fund [Member]
Available-for-sale securities
Amortized Cost	61,350	61,350
Gross Unrealized Gains	0	1,577
Gross Unrealized Losses	-2,407	0
Estimated Fair Value	$58,943	$62,927

Financial_Instruments_Details_

Financial Instruments (Details 1) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Mar. 30, 2013
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	$1,019,343	$792,298
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	-16,874	-5,180
Available-for-Sale Securities, 12 Months or Greater, Fair Value	55,143	39,790
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	-3,250	-3,347
Available-for-Sale Securities, Fair Value, Total	1,074,486	832,088
Available-for-Sale Securities, Gross Unrealized Losses, Total	-20,124	-8,527
Corporate Bonds [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	127,859	27,114
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	-1,977	-135
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	127,859	27,114
Available-for-Sale Securities, Gross Unrealized Losses, Total	-1,977	-135
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	22,636	28,701
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	-2,514	-3,200
Available-for-Sale Securities, Fair Value, Total	22,636	28,701
Available-for-Sale Securities, Gross Unrealized Losses, Total	-2,514	-3,200
Municipal Bonds [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	9,691	8,927
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	-341	-70
Available-for-Sale Securities, 12 Months or Greater, Fair Value	862	60
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	-28	0
Available-for-Sale Securities, Fair Value, Total	10,553	8,987
Available-for-Sale Securities, Gross Unrealized Losses, Total	-369	-70
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	212,267	388,696
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	-217	-45
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	212,267	388,696
Available-for-Sale Securities, Gross Unrealized Losses, Total	-217	-45
Mortgage-Backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	610,583	367,561
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	-11,932	-4,930
Available-for-Sale Securities, 12 Months or Greater, Fair Value	31,645	11,029
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	-708	-147
Available-for-Sale Securities, Fair Value, Total	642,228	378,590
Available-for-Sale Securities, Gross Unrealized Losses, Total	-12,640	-5,077
Debt Mutual Fund [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	58,943
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	-2,407
Available-for-Sale Securities, 12 Months or Greater, Fair Value	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	0
Available-for-Sale Securities, Fair Value, Total	58,943
Available-for-Sale Securities, Gross Unrealized Losses, Total	($2,407)

Financial_Instruments_Details_1

Financial Instruments (Details 2) (USD $)	Sep. 28, 2013
Investments, All Other Investments [Abstract]
Marketable debt securities with contractual maturities greater than one year but classified as short-term investment	$192,600,000
Amortized cost and estimated fair value of marketable debt securities
Amortized Cost Due in one year or less	1,858,718,000
Amortized Cost Due after one year through five years	384,528,000
Amortized Cost Due after five years through ten years	252,551,000
Amortized Cost Due after ten years	936,885,000
Amortized Cost Total	3,432,682,000
Estimated Fair Value Due in one year or less	1,858,944,000
Estimated Fair Value Due after one year through five years	385,905,000
Estimated Fair Value Due after five years through ten years	254,235,000
Estimated Fair Value Due after ten years	930,306,000
Estimated Fair Value Total	$3,429,390,000

Financial_Instruments_Details_2

Financial Instruments (Details 3) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Information on sale of available-for-sale securities
Proceeds from sale of available-for-sale securities	$104,021	$119,058	$199,160	$201,163
Gross realized gains on sale of available-for-sale securities	266	1,042	1,367	1,829
Gross realized losses on sale of available-for-sale securities	-521	-12	-1,515	-88
Net realized gains on sale of available-for-sale securities	-255	1,030	-148	1,741
Amortization of premiums on available-for-sale securities	$6,904	$5,942	$14,063	$11,561

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (USD $)	Sep. 28, 2013	Mar. 30, 2013
In Thousands, unless otherwise specified
Forward currency exchange contracts outstanding
Derivative, Notional Amount	$136,638	$149,496
Singapore Dollar [Member]
Forward currency exchange contracts outstanding
Derivative, Notional Amount	62,688	70,197
Euro [Member]
Forward currency exchange contracts outstanding
Derivative, Notional Amount	40,200	39,865
Indian Rupee [Member]
Forward currency exchange contracts outstanding
Derivative, Notional Amount	14,573	16,941
British Pound [Member]
Forward currency exchange contracts outstanding
Derivative, Notional Amount	9,599	11,602
Japanese Yen [Member]
Forward currency exchange contracts outstanding
Derivative, Notional Amount	$9,578	$10,891

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 1) (USD $)	Sep. 28, 2013	Mar. 30, 2013
In Thousands, unless otherwise specified
Prepaid expenses and other current assets
Derivative Instruments located on Condensed Consolidated Balance sheet
Asset Derivatives, Fair Value	$2,422	$1,179
Other accrued liabilities
Derivative Instruments located on Condensed Consolidated Balance sheet
Liability Derivatives, Fair Value	$1,910	$2,794

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Details 2) (Cash Flow Hedging [Member], USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013		Sep. 29, 2012		Sep. 28, 2013		Sep. 29, 2012
Interest And Other Expense, Net [Member]
Effect of derivative instruments located on condensed consolidated Statements of Income
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective portion)	($1,389)	[1]	($1,833)	[1]	($2,095)	[1]	($2,992)	[1]
Amount of Gain (Loss) Recorded (Ineffective portion)	24	[1]	8	[1]	7	[1]	7	[1]
Foreign Exchange Contracts [Member]
Effect of derivative instruments located on condensed consolidated Statements of Income
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective portion of cash flow hedging)	$2,742		$7,968		$1,940		$5,505
[1]	Recorded in Interest and Other Expense location within the condensed consolidated statements of income

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Details Textual) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Mar. 30, 2013
Derivative [Line Items]
Hedging Program number of years	2 years
Interest rate of debentures	3.13%
Fair value of the embedded derivative	$407	$1,100
Minimum [Member]
Derivative [Line Items]
Outstanding forward currency exchange contracts expire	1-Oct-13
Maximum [Member]
Derivative [Line Items]
Outstanding forward currency exchange contracts expire	1-Aug-15

StockBased_Compensation_Plans_1

Stock-Based Compensation Plans (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Stock Based compensation expense
Allocated share-based compensation expense	$23,060	$19,246	$44,014	$36,854
Cost of Revenues [Member]
Stock Based compensation expense
Allocated share-based compensation expense	1,858	1,473	3,662	3,201
Research and Development [Member]
Stock Based compensation expense
Allocated share-based compensation expense	11,343	9,404	21,562	18,027
Selling, General And Administrative [Member]
Stock Based compensation expense
Allocated share-based compensation expense	$9,859	$8,369	$18,790	$15,626

StockBased_Compensation_Plans_2

Stock-Based Compensation Plans (Details 1)	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Employee Stock Option [Member]
Weighted average assumptions in estimation of fair value of stock options
Expected life of options (years)		4 years 10 months 24 days	4 years 8 months 15 days	4 years 10 months 24 days
Expected stock price volatility		29.00%	24.00%	29.00%
Risk-free interest rate		0.70%	0.90%	0.70%
Dividend yield		2.60%	2.60%	2.60%
Restricted Stock Units (RSUs) [Member]
Weighted average assumptions in estimation of fair value of stock options
Risk-free interest rate	0.70%	0.40%	0.70%	0.40%
Dividend yield	2.50%	2.70%	2.50%	2.70%
Employee Stock Purchase Plan [Member]
Weighted average assumptions in estimation of fair value of stock options
Expected life of options (years)			1 year 3 months	1 year 3 months
Expected stock price volatility			23.00%	29.00%
Risk-free interest rate			0.20%	0.20%
Dividend yield			2.10%	2.70%

StockBased_Compensation_Plans_3

Stock-Based Compensation Plans (Details 2) (USD $)	6 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Mar. 30, 2013
Summary of option plans activity
Number of Shares, Beginning balance	12,753	17,788
Number of Shares, Granted	5	92
Number of Shares, Exercised	-4,376	-3,564
Number of Shares, Forfeited/cancelled/expired	-45	-1,563
Number of Shares, Ending balance	8,337	12,753
Number of Shares, Options exercisable	7,678	11,639
Weighted-Average Exercise Price Per Share, Beginning balance	$28.01	$28.32
Weighted-Average Exercise Price Per Share, Granted	$38.99	$33.83
Weighted-Average Exercise Price Per Share, Exercised	$29.09	$24.68
Weighted-Average Exercise Price Per Share, Forfeited/cancelled/expired	$33.44	$39.54
Weighted-Average Exercise Price Per Share, Ending balance	$27.40	$28.01
Weighted-Average Exercise Price Per Share, Options exercisable	$27.28	$28.07

StockBased_Compensation_Plans_4

Stock-Based Compensation Plans (Details 3) (USD $)	6 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Mar. 30, 2013
Summary of restricted stock unit activity and related information
Number of Shares, Beginning balance	5,996	5,239
Number of Shares, Granted	2,562	3,018
Number of Shares, Vested	-1,600	-1,778
Number of Shares, Cancelled	-170	-483
Number of Shares, Ending balance	6,788	5,996
Weighted-Average Grant-Date Fair Value, Beginning balance	$30.83	$29.01
Weighted-Average Grant-Date Fair Value, Granted	$37.63	$31.58
Weighted-Average Grant-Date Fair Value, Vested	$29.18	$27.01
Weighted-Average Grant-Date Fair Value, Cancelled	$31.38	$29.69
Weighted-Average Grant-Date Fair Value, Ending balance	$33.77	$30.83

StockBased_Compensation_Plans_5

Stock-Based Compensation Plans (Details Textual) (USD $)

3 Months Ended

6 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Mar. 30, 2013

Sep. 28, 2013

Aug. 14, 2013

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Aug. 14, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Equity Plan Two Thousand Seven [Member]

Equity Plan Two Thousand Seven [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock [Member]

Employee Stock [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved

2,000,000

2,000,000

Stock Issued During Period, Shares, Employee Stock Purchase Plans

529,000

521,000

Stock Issued During Period, Value, Employee Stock Purchase Plan

$14.60

$14.10

Employee Service Share-based Compensation, Tax Benefit from Compensation Expense

16.4

3.3

Weighted average fair value per share of stock options granted

$6.06

$6.35

Weighted average fair value per share of RSUs and stock purchase rights granted

$37.63

$31.58

$11.24

$8.53

$37.81

$31.12

$37.63

$31.57

Shares available for grant

15,600,000

10,400,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value

$52.50

$7.80

$65.30

$11.70

Authorized number of shares reserved for issuance

50,500,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures

5,000

92,000

0

Net_Income_Per_Common_Share_De

Net Income Per Common Share (Details)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Debt Instrument [Line Items]
Potentially dilutive common equivalent shares outstanding	6.7	4.1	5.6	4.3
Antidilutive shares excluded from computation of dilutive net income per common share	1.4		3.7
Convertible Debt [Member]
Debt Instrument [Line Items]
Potentially dilutive common equivalent shares outstanding	15.5		13.3
Three And One Two Five Percent Junior Subordinated Convertible Debentures [Member]
Debt Instrument [Line Items]
Potentially dilutive common equivalent shares outstanding		5.5		5.8

Net_Income_Per_Common_Share_EP

Net Income Per Common Share (EPS) (Details) (USD $)	Sep. 28, 2013
In Millions, except Per Share data, unless otherwise specified
Debt Instrument [Line Items]
Stated interest rate of debentures	3.13%
2.625% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Stated interest rate of debentures	2.63%
Maximum number of shares to be purchased under call option	20
Price per share of common stock to be purchased under call option	29.97

Inventories_Details

Inventories (Details) (USD $)	Sep. 28, 2013	Mar. 30, 2013
In Thousands, unless otherwise specified
Components of inventory
Raw materials	$12,851	$12,484
Work-in-process	148,506	165,034
Finished goods	22,351	23,732
Total inventories	$183,708	$201,250	[1]
[1]	Derived from audited financial statements

Convertible_Debentures_and_Rev2

Convertible Debentures and Revolving Credit Facility (Details) (USD $)	Sep. 28, 2013	Mar. 30, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Convertible debentures	$930,085	$0	[1]
2.625% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Principal amount of Debentures	600,000	600,000
Unamortized discount of liability component	-56,995	-64,767
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	16,470	18,716
Carrying value of liability component	559,475	553,949
Equity component (including temporary equity) - net carrying value	66,415	66,415
3.125% Junior Convertible Debentures [Member]
Debt Instrument [Line Items]
Principal amount of Debentures	689,635	689,635
Unamortized discount of liability component	-318,073	-320,620
Unamortized discount of embedded derivative from date of issuance	-1,359	-1,388
Carrying value of liability component	370,203	367,627
Carrying value of embedded derivative component	407	1,090
Convertible debentures	370,610	368,717
Equity component (including temporary equity) - net carrying value	$229,513	$229,513
[1]	Derived from audited financial statements

Convertible_Debentures_and_Rev3

Convertible Debentures and Revolving Credit Facility Convertible Debentures and Revolving Credit Facility #2 (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Debt Instrument [Line Items]
Amortization of debt discount			$8,073	$7,897
3.125% Junior Convertible Debentures [Member]
Debt Instrument [Line Items]
Contractual coupon interest	5,388	5,388	10,776	10,776
Amortization of debt issuance costs	55	55	112	112
Amortization of embedded derivative	14	14	29	29
Amortization of debt discount	1,285	1,196	2,547	2,371
Fair value adjustment of embedded derivative	-758	0	-683	614
Total interest expense related to the Debentures	5,984	6,653	12,781	13,902
2.625% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Contractual coupon interest	3,938	3,938	7,875	7,875
Amortization of debt issuance costs	362	362	724	724
Amortization of debt discount	2,763	2,763	5,526	5,526
Total interest expense related to the Debentures	$7,063	$7,063	$14,125	$14,125

Convertible_Debentures_and_Rev4

Convertible Debentures and Revolving Credit Facility (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Sep. 28, 2013	Sep. 28, 2013	Mar. 30, 2013
Debt Instrument [Line Items]
Interest rate of debentures	3.13%	3.13%
3.125% Junior Convertible Debentures [Member]
Debt Instrument [Line Items]
Principal amount of Debentures	$689,635,000	$689,635,000	$689,635,000
Interest rate of debentures	3.13%	3.13%
Conversion rate of convertible debentures per $1 thousand principal amount		34.2957
Base conversion block amount of junior convertible debenture		1,000
Effective conversion price of debentures	$29.16	$29.16
Maximum borrowing capacity of revolving credit facility	250,000,000	250,000,000
Line of Credit Facility, Average Outstanding Amount	0
2.625% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Principal amount of Debentures	600,000,000	600,000,000	600,000,000
Interest rate of debentures	2.63%	2.63%
Conversion rate of convertible debentures per $1 thousand principal amount		33.3681
Base conversion block amount of senior convertible debenture		$1,000
Effective conversion price of debentures	$29.97	$29.97

Common_Stock_Repurchase_Progra1

Common Stock Repurchase Program (Details) (USD $)	Sep. 28, 2013	Mar. 30, 2013	Aug. 31, 2012	Sep. 28, 2013	Sep. 28, 2013	Sep. 29, 2012
In Millions, except Share data, unless otherwise specified			Repurchase Program Two Thousand Twelve [Member]	Repurchase Program Two Thousand Twelve [Member]	Repurchase Program 2010 [Member]	Repurchase Program 2010 [Member]
Accelerated Share Repurchases [Line Items]
Amount authorized for common stock repurchase			$750
Total amount of common shares repurchased				80.5	70	178.1
Total amount available for future repurchases				$669.50
Treasury shares held	0	0
Number of common shares repurchased					1,500,000	5,600,000

Interest_and_Other_Expense_Net1

Interest and Other Expense, Net (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Components of interest and other expense
Interest income	$5,363	$6,271	$10,966	$12,063
Interest expense	-13,047	-13,717	-26,906	-28,027
Other income (expense), net	-3,313	-2,557	-4,987	-3,711
Interest and other expense, net	($10,997)	($10,003)	($20,927)	($19,675)

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Details) (USD $)	Sep. 28, 2013	Mar. 30, 2013
In Thousands, unless otherwise specified
Components of accumulated other comprehensive income
Accumulated unrealized gains on available-for-sale securities, net of tax	($3,578)	$10,519
Accumulated unrealized gain (losses) on hedging transactions, net of tax	572	-1,368
Accumulated cumulative translation adjustment	-1,555	-491
Accumulated other comprehensive income	($4,561)	$8,660	[1]
[1]	Derived from audited financial statements

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Income Taxes (Textual) [Abstract]
Tax provisions	$11,304,000	$14,646,000	$37,260,000	$39,720,000
Effective tax rate	7.00%	11.00%	11.00%	14.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	36,000,000
Gross unrecognized tax benefits balance	34,100,000		34,100,000
Unrecognized tax benefits that would impact effective tax rate	$12,100,000		$12,100,000

Commitments_Details

Commitments (Details) (USD $)	Sep. 28, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Future Minimum Payments Due, Remainder of Fiscal Year	$2,881
Future Minimum Lease Payments Under Non-Cancelable Operating Leases
2014 (remaining nine months)	4,472
2015	3,026
2016	2,295
2017	3,114
Thereafter	5,110
Total	$20,898

Commitments_Details_Textual

Commitments (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Commitments (Textual) [Abstract]
Aggregate future rental income to be received	$6,100,000		$6,100,000
Rent expense, net of rental income	725,000	1,300,000	1,500,000	2,100,000
Other commitments	105,700,000		105,700,000
Non-cancelable license obligations	16,600,000		16,600,000
Maximum future commitment to acquire licenses to intellectual property until July 2023	$5,000,000

Contingencies_Details

Contingencies (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended	3 Months Ended	12 Months Ended	15 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Sep. 03, 2013	Sep. 28, 2013	Mar. 30, 2013	Aug. 30, 2013
					PACT XPP Technologies, AG v. Xilinx and Avnet [Member]	PACT XPP Technologies, AG v. Xilinx and Avnet [Member]	PACT XPP Technologies, AG v. Xilinx and Avnet [Member]	PACT XPP Technologies, AG v. Xilinx and Avnet [Member]
Contingencies (Textual) [Abstract]
Damages awarded							$15,400,000	$38,500,000
Damages awarded, costs and attorney fees					2,500,000
Damages awarded, interest expense					3,000,000
Loss contingency recognized	$28,600,000	$0	$28,600,000	$0		$28,600,000

Goodwill_and_AcquisitionRelate2

Goodwill and Acquisition-Related Intangibles (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Mar. 30, 2013
Gross and net amounts of goodwill and of acquisition-related intangibles
Goodwill	$158,990	$158,990	[1]
Total acquisition-related intangibles, gross	135,876	135,876
Less accumulated amortization	-104,657	-99,822
Total	31,219	36,054
Core Technology [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	89,360	89,360
Less accumulated amortization	-58,578	-54,201
Total	30,782	35,159
Weighted Average Amortization Life	5 years 9 months 18 days
Other Intangibles [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	46,516	46,516
Less accumulated amortization	-46,079	-45,621
Total	$437	$895
Weighted Average Amortization Life	2 years 8 months 12 days
[1]	Derived from audited financial statements

Goodwill_and_AcquisitionRelate3

Goodwill and Acquisition-Related Intangibles (Details 1) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Mar. 30, 2013
Schedule of expected annual amortization expense for acquisition-related intangibles
2014 (remaining six months)	$4,707		$4,707
2015	8,845		8,845
2016	8,244		8,244
2017	6,473		6,473
2018	2,347		2,347
Thereafter	603		603
Total	31,219		31,219		36,054
Goodwill and Acquisition-Related Intangibles (Textual) [Abstract]
Amortization of acquisition-related intangibles	$2,418	$2,319	$4,836	$4,467

Subsequent_Event_Details

Subsequent Event (Details) (USD $)	6 Months Ended
	Sep. 28, 2013	Oct. 15, 2013
Subsequent Event (Textual) [Abstract]
Cash dividend declared		$0.25
Dividend payable date	27-Nov-13
Dividend record date	6-Nov-13