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Common Stock Repurchase Program (Details) (USD $)
9 Months Ended 1 Months Ended 28 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Nov. 30, 2014
Aug. 31, 2012
Dec. 27, 2014
Mar. 29, 2014
Accelerated Share Repurchases [Line Items]            
Treasury shares 0us-gaap_TreasuryStockShares       0us-gaap_TreasuryStockShares 0us-gaap_TreasuryStockShares
Stock Repurchased During Period, Shares (11,000,000)us-gaap_StockRepurchasedDuringPeriodShares          
Payments for Repurchase of Common Stock $ 476,012,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 167,121,000us-gaap_PaymentsForRepurchaseOfCommonStock        
Repurchase Program Two Thousand Fourteen [Member]            
Accelerated Share Repurchases [Line Items]            
Amount authorized for common stock repurchase     800,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= xlnx_RepurchaseProgramTwoThousandFourteenMemberDomain
     
Stock Repurchased and Retired During Period, Value 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= xlnx_RepurchaseProgramTwoThousandFourteenMemberDomain
         
Repurchase Program 2012 [Member]            
Accelerated Share Repurchases [Line Items]            
Amount authorized for common stock repurchase       750,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= xlnx_RepurchaseProgramTwoThousandTwelveMember
   
Stock Repurchased and Retired During Period, Value 475,000,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= xlnx_RepurchaseProgramTwoThousandTwelveMember
167,100,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= xlnx_RepurchaseProgramTwoThousandTwelveMember
    727,600,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= xlnx_RepurchaseProgramTwoThousandTwelveMember
 
Total amount available for future repurchases $ 822,400,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= xlnx_RepurchaseProgramTwoThousandTwelveMember
         
Stock Repurchased and Retired During Period, Shares   3,700,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= xlnx_RepurchaseProgramTwoThousandTwelveMember