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Note 5 - Fair Value (Details) (USD $)
12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Sep. 28, 2014
Note 5 - Fair Value (Details) [Line Items]      
Business Combination, Contingent Consideration, Liability   $ 4,300,000us-gaap_BusinessCombinationContingentConsiderationLiability  
Available-for-sale Securities, Gross Unrealized Gain (Loss) 0us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1    
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 828,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 828,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax  
CounterPath [Member]      
Note 5 - Fair Value (Details) [Line Items]      
Common Stock Shares Received, Dissolution (in Shares) 93,000exar_CommonStockSharesReceivedDissolution
/ invest_InvestmentAxis
= exar_CounterPathMember
   
Altior Inc. and Cadeka Microcircuits [Member]      
Note 5 - Fair Value (Details) [Line Items]      
Business Combination, Contingent Consideration, Liability     $ 0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= exar_AltiorIncAndCadekaMicrocircuitsMember