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Net Income Per Common Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 27, 2014
Dec. 27, 2014
Schedule of Debt Instruments [Line Items]    
Antidilutive shares excluded from computation of dilutive net income per common share 0.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
2017 Convertible Notes [Member]    
Schedule of Debt Instruments [Line Items]    
Maximum number of common shares to be purchased under call option 20.2xlnx_MaximumNumberOfSharesToBePurchasedByCompanyUnderCallOption
/ us-gaap_ShortTermDebtTypeAxis
= xlnx_TwoAndSixTwoFivePercentSeniorConvertibleDebenturesMember
20.2xlnx_MaximumNumberOfSharesToBePurchasedByCompanyUnderCallOption
/ us-gaap_ShortTermDebtTypeAxis
= xlnx_TwoAndSixTwoFivePercentSeniorConvertibleDebenturesMember
Price Per Share To Be Purchase By Company Under Call Option 29.64xlnx_PricePerShareToBePurchaseByCompanyUnderCallOption
/ us-gaap_ShortTermDebtTypeAxis
= xlnx_TwoAndSixTwoFivePercentSeniorConvertibleDebenturesMember