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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 28, 2015
position
Mar. 29, 2014
Mar. 30, 2013
Restructuring Cost and Reserve [Line Items]      
Impairment of Intangible Assets (Excluding Goodwill) $ 6,578us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill    
Restructuring Reserve 14,634us-gaap_RestructuringReserve 0us-gaap_RestructuringReserve  
Number of positions eliminated in restructuring 120us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated    
Number of positions eliminated in restructuring, percent (less than) 3.00%us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent    
Restructuring charges 24,491us-gaap_RestructuringCharges 0us-gaap_RestructuringCharges 0us-gaap_RestructuringCharges
Employee Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 13,531us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringPlanAxis
= us-gaap_EmployeeSeveranceMember
   
Payments for Restructuring (2,647)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= us-gaap_EmployeeSeveranceMember
   
Restructuring Reserve, Settled without Cash (579)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringPlanAxis
= us-gaap_EmployeeSeveranceMember
   
Restructuring Reserve 10,305us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= us-gaap_EmployeeSeveranceMember
   
Asset impairment restructuring charges [Member]      
Restructuring Cost and Reserve [Line Items]      
Payments for Restructuring 0us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= xlnx_AssetimpairmentrestructuringchargesMember
   
Restructuring Reserve, Settled without Cash (6,578)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringPlanAxis
= xlnx_AssetimpairmentrestructuringchargesMember
   
Restructuring Reserve 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= xlnx_AssetimpairmentrestructuringchargesMember
   
Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 4,382us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringPlanAxis
= us-gaap_OtherRestructuringMember
   
Payments for Restructuring 0us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= us-gaap_OtherRestructuringMember
   
Restructuring Reserve, Settled without Cash (53)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringPlanAxis
= us-gaap_OtherRestructuringMember
   
Restructuring Reserve 4,329us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= us-gaap_OtherRestructuringMember
   
Restructuring Cost, Total [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 24,491us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringPlanAxis
= xlnx_RestructuringCostTotalMember
   
Payments for Restructuring (2,647)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= xlnx_RestructuringCostTotalMember
   
Restructuring Reserve, Settled without Cash (7,210)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringPlanAxis
= xlnx_RestructuringCostTotalMember
   
Restructuring Reserve $ 14,634us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= xlnx_RestructuringCostTotalMember