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Net Income Per Common Share Net Income Per Common Share (Details 1) (2017 Convertible Notes, USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 29, 2014
Mar. 28, 2015
2017 Convertible Notes
    
Short-term Debt [Line Items]    
Maximum number of common shares to be purchased under call option   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