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Stock-Based Compensation Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 27, 2014
Dec. 28, 2013
Stock Based compensation expense        
Stock-based compensation effect on income before taxes $ 29,054us-gaap_AllocatedShareBasedCompensationExpense $ 24,339us-gaap_AllocatedShareBasedCompensationExpense $ 79,900us-gaap_AllocatedShareBasedCompensationExpense $ 68,353us-gaap_AllocatedShareBasedCompensationExpense
Cost of Revenues [Member]        
Stock Based compensation expense        
Stock-based compensation effect on income before taxes 2,339us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= xlnx_CostOfRevenuesMember		 1,966us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= xlnx_CostOfRevenuesMember		 6,408us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= xlnx_CostOfRevenuesMember		 5,628us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= xlnx_CostOfRevenuesMember
Research and Development [Member]        
Stock Based compensation expense        
Stock-based compensation effect on income before taxes 14,909us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 11,912us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 40,245us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 33,474us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Selling, General and Administrative Expenses [Member]        
Stock Based compensation expense        
Stock-based compensation effect on income before taxes $ 11,806us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 10,461us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 33,247us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 29,251us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember