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Stock-Based Compensation Plans (Details Textual) (USD $)
12 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 30, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capitalized stock-based compensation, included in inventory $ 2,400,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount $ 2,400,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount    
Tax benefit associated with stock option exercises and other awards 55,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 67,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 32,600,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense  
Shares available for grant 18,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant      
Percentage of fair market value of stock on the grant date 100.00%xlnx_PercentageOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue      
Award vesting period 4 years      
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of options vested during the period 1,800,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Nonvested awards, stock-based compensation cost not yet recognized 467,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Nonvested awards, stock-based compensation cost not yet recognized, weighted-average recognition period 1 year 6 months 0 days      
Pre-tax intrinsic value of options exercised in period 37,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
119,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value per share of stock options granted $ 9.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
$ 11.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
$ 8.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
 
Nonvested awards, stock-based compensation cost not yet recognized 24,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
     
Nonvested awards, stock-based compensation cost not yet recognized, weighted-average recognition period 1 year 3 months 0 days      
Shares available for grant 10,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
     
Stock Purchase Plan, Exercise period 6 months      
Employee Stock Purchase Plan annual earnings Maximum 21,000xlnx_EmployeeStockPurchasePlanAnnualEarningsMaximum
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
     
Percentage of Employee Stock Purchase Plan participation 84.00%xlnx_PercentageOfEmployeeStockPurchasePlanParticipation
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
     
Percentage Of Employee Stock Purchase plan Lower Fair Market Value 85.00%xlnx_PercentageOfEmployeeStockPurchasePlanLowerFairMarketValue
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
     
Stock offering period 24 months      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 1,200,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
1,200,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
1,300,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
 
Stock Issued During Period, Value, Employee Stock Purchase Plan 39,000,000us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
37,900,000us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
34,500,000us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
 
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value per share of RSUs and stock purchase rights granted $ 43.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 38.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 31.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Nonvested awards, stock-based compensation cost not yet recognized 180,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Nonvested awards, stock-based compensation cost not yet recognized, weighted-average recognition period 2 years 7 months 18 days      
Fair value of restricted stock units vested during the period $ 91,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
2007 Equity Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested awards, stock-based compensation cost not yet recognized, weighted-average recognition period 7 years      
Shares available for grant 15,373,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= xlnx_EquityPlanTwoThousandSevenMember
15,037,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= xlnx_EquityPlanTwoThousandSevenMember
15,990,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= xlnx_EquityPlanTwoThousandSevenMember
14,908,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= xlnx_EquityPlanTwoThousandSevenMember
Prior to April 1, 2007 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested awards, stock-based compensation cost not yet recognized, weighted-average recognition period 10 years      
Maximum [Member] | Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage Of Participation Of Employee Annual Earnings 15.00%xlnx_PercentageOfParticipationOfEmployeeAnnualEarnings
/ us-gaap_AwardTypeAxis
= xlnx_EmployeeStockPurchasePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember