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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Mar. 29, 2014
Available-for-sale securities    
Amortized Cost $ 3,449,866us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 3,606,739us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Gross Unrealized Gains (Instant) 14,047xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant 16,763xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
Available-for-sale Securities, Gross Unrealized Losses (Instant) (14,453)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant (18,153)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
Available-for-sale Securities, Noncurrent 654,013us-gaap_AvailableForSaleSecuritiesNoncurrent 1,190,775us-gaap_AvailableForSaleSecuritiesNoncurrent [1]
Estimated Fair Value 3,449,460us-gaap_AvailableForSaleSecurities 3,605,349us-gaap_AvailableForSaleSecurities
Money Market Funds [Member]    
Available-for-sale securities    
Amortized Cost 302,542us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MoneyMarketFundsMember
213,988us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MoneyMarketFundsMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MoneyMarketFundsMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MoneyMarketFundsMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) 0xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MoneyMarketFundsMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MoneyMarketFundsMember
Estimated Fair Value 302,542us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MoneyMarketFundsMember
213,988us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MoneyMarketFundsMember
financial institution securities [Member]    
Available-for-sale securities    
Amortized Cost 218,999us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_FinancialinstitutionsecuritiesMember
366,906us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_FinancialinstitutionsecuritiesMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_FinancialinstitutionsecuritiesMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_FinancialinstitutionsecuritiesMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) 0xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_FinancialinstitutionsecuritiesMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_FinancialinstitutionsecuritiesMember
Estimated Fair Value 218,999us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_FinancialinstitutionsecuritiesMember
366,906us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_FinancialinstitutionsecuritiesMember
Non-financial institution securities [Member]    
Available-for-sale securities    
Amortized Cost 207,535us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_NonfinancialinstitutionsecuritiesMember
753,888us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_NonfinancialinstitutionsecuritiesMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 50xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_NonfinancialinstitutionsecuritiesMember
3,428xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_NonfinancialinstitutionsecuritiesMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) (4)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_NonfinancialinstitutionsecuritiesMember
(1,244)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_NonfinancialinstitutionsecuritiesMember
Estimated Fair Value 207,581us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_NonfinancialinstitutionsecuritiesMember
756,072us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_NonfinancialinstitutionsecuritiesMember
Auction Rate Securities [Member]    
Available-for-sale securities    
Amortized Cost 10,500us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
21,500us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) (175)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
(1,340)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
Available-for-sale Securities, Noncurrent 10,325us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
20,160us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
Municipal Bonds [Member]    
Available-for-sale securities    
Amortized Cost 43,328us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
31,367us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 603xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
604xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) (193)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
(205)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Estimated Fair Value 43,738us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
31,766us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
U.S. Government and Agency Securities [Member]    
Available-for-sale securities    
Amortized Cost 695,442us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
548,568us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 81xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
1,135xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) (134)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
(184)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Estimated Fair Value 695,389us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
549,519us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Foreign Government and Agency Securities [Member]    
Available-for-sale securities    
Amortized Cost 349,972us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
354,935us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) 0xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Estimated Fair Value 349,972us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
354,935us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Mortgage-Backed Securities [Member]    
Available-for-sale securities    
Amortized Cost 1,208,162us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
1,234,237us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 12,214xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
11,380xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) (6,318)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
(10,528)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Estimated Fair Value 1,214,058us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
1,235,089us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Asset-backed Securities [Member]    
Available-for-sale securities    
Amortized Cost 213,833us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
0us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 1,019xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) (475)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Estimated Fair Value 214,377us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Debt Mutual Fund [Member]    
Available-for-sale securities    
Amortized Cost 101,350us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_DebtMutualFundMember
81,350us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_DebtMutualFundMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_DebtMutualFundMember
216xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_DebtMutualFundMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) (5,675)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_DebtMutualFundMember
(4,652)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_DebtMutualFundMember
Estimated Fair Value 95,675us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_DebtMutualFundMember
76,914us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_DebtMutualFundMember
Bank Loans [Member]    
Available-for-sale securities    
Amortized Cost 98,203us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_BankLoansMember
0us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_BankLoansMember
Available-for-sale Securities, Gross Unrealized Gains (Instant) 80xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_BankLoansMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedGainsInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_BankLoansMember
Available-for-sale Securities, Gross Unrealized Losses (Instant) (1,479)xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_BankLoansMember
0xlnx_AvailableforsaleSecuritiesGrossUnrealizedLossesInstant
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_BankLoansMember
Estimated Fair Value $ 96,804us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_BankLoansMember
$ 0us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= xlnx_BankLoansMember
[1] Derived from audited financial statements