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Net Income Per Common Share Earnings Per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 28, 2015
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 28, 2015
Mar. 29, 2014
Mar. 30, 2013
Earnings Per Share [Abstract]                      
Net income $ 134,623us-gaap_NetIncomeLoss [1] $ 168,466us-gaap_NetIncomeLoss [1] $ 171,516us-gaap_NetIncomeLoss [1] $ 173,611us-gaap_NetIncomeLoss [1] $ 156,027us-gaap_NetIncomeLoss [2] $ 175,877us-gaap_NetIncomeLoss [2] $ 141,461us-gaap_NetIncomeLoss [2] $ 157,023us-gaap_NetIncomeLoss [2] $ 648,216us-gaap_NetIncomeLoss $ 630,388us-gaap_NetIncomeLoss $ 487,536us-gaap_NetIncomeLoss
Weighted Average Number of Shares Outstanding, Basic 260,857us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 262,881us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 265,942us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 267,648us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 268,134us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 267,780us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 268,478us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 264,153us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 265,480us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 266,431us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 261,652us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements                 3,257us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 4,508us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 4,146us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities and Warrants                 7,386xlnx_IncrementalCommonSharesAttributabletoDilutiveEffectofConversionofDebtSecuritiesandWarrants 8,544xlnx_IncrementalCommonSharesAttributabletoDilutiveEffectofConversionofDebtSecuritiesandWarrants 2,924xlnx_IncrementalCommonSharesAttributabletoDilutiveEffectofConversionofDebtSecuritiesandWarrants
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities                 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 7,913us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 3,851us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Weighted Average Number of Shares Outstanding, Diluted 269,514us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 273,795us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 275,800us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 281,579us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 294,536us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 288,195us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 290,685us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 280,291us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 276,123us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 287,396us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 272,573us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings Per Share, Basic $ 0.52us-gaap_EarningsPerShareBasic [1],[3] $ 0.64us-gaap_EarningsPerShareBasic [1],[3] $ 0.64us-gaap_EarningsPerShareBasic [1],[3] $ 0.65us-gaap_EarningsPerShareBasic [1],[3] $ 0.58us-gaap_EarningsPerShareBasic [2],[3] $ 0.66us-gaap_EarningsPerShareBasic [2],[3] $ 0.53us-gaap_EarningsPerShareBasic [2],[3] $ 0.59us-gaap_EarningsPerShareBasic [2],[3] $ 2.44us-gaap_EarningsPerShareBasic $ 2.37us-gaap_EarningsPerShareBasic $ 1.86us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted $ 0.50us-gaap_EarningsPerShareDiluted [1],[3] $ 0.62us-gaap_EarningsPerShareDiluted [1],[3] $ 0.62us-gaap_EarningsPerShareDiluted [1],[3] $ 0.62us-gaap_EarningsPerShareDiluted [1],[3] $ 0.53us-gaap_EarningsPerShareDiluted [2],[3] $ 0.61us-gaap_EarningsPerShareDiluted [2],[3] $ 0.49us-gaap_EarningsPerShareDiluted [2],[3] $ 0.56us-gaap_EarningsPerShareDiluted [2],[3] $ 2.35us-gaap_EarningsPerShareDiluted $ 2.19us-gaap_EarningsPerShareDiluted $ 1.79us-gaap_EarningsPerShareDiluted
[1] Xilinx uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2015 was a 52-week year and each quarter was a 13-week quarter.
[2] Xilinx uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2014 was a 52-week year and each quarter was a 13-week quarter.
[3] Net income per common share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per common share information may not equal the annual net income per common share.