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Employee Benefit Plans (Details) (USD $)
12 Months Ended
Mar. 28, 2015
participant
Mar. 29, 2014
Mar. 30, 2013
Postemployment Benefits [Abstract]      
Total contribution to the employee benefit plans $ 13,000,000us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution $ 13,200,000us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution $ 12,200,000us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Employer matching contribution limit, as a percentage of employee contribution 50.00%xlnx_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeeContribution    
First part of employee compensation that the employee contributed to their 401(k) accounts 8.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
The maximum company contribution per employee 4,500us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount    
Participants' age limit eligible to make catch up salary deferral contribution 50 years    
Percentage of salary deferrals of the eligible annual salary 25.00%xlnx_PercentageOfSalaryDeferralContributions    
Number of participants in the plan who self direct their contribution into investment option (more than) 155xlnx_NumberOfParticipantsInBenefitPlan    
Employee benefit plan assets 59,200,000us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent 50,600,000us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent  
Employee benefit plan obligations $ 70,200,000us-gaap_DefinedBenefitPlanBenefitObligation $ 59,600,000us-gaap_DefinedBenefitPlanBenefitObligation