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Note 8 - Long-term Investment (Details) (USD $)
12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Jun. 29, 2014
Note 8 - Long-term Investment (Details) [Line Items]        
Long-term Investments $ 394,000us-gaap_LongTermInvestments $ 946,000us-gaap_LongTermInvestments $ 1,288,000us-gaap_LongTermInvestments  
Long-term Investments, Cumulative Impairment Charges 500,000exar_LongTermInvestmentsCumulativeImpairmentCharges      
Skypoint Fund [Member]        
Note 8 - Long-term Investment (Details) [Line Items]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 4,800,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentIssuerAxis
= exar_SkypointFundMember
     
Number of Investee Companies 3exar_NumberOfInvesteeCompanies
/ invest_InvestmentIssuerAxis
= exar_SkypointFundMember
     
Cost-method Investments, Other than Temporary Impairment $ 500,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ invest_InvestmentIssuerAxis
= exar_SkypointFundMember
$ 300,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ invest_InvestmentIssuerAxis
= exar_SkypointFundMember
$ 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ invest_InvestmentIssuerAxis
= exar_SkypointFundMember
 
CounterPath [Member]        
Note 8 - Long-term Investment (Details) [Line Items]        
Common Stock Shares Received, Dissolution (in Shares)       93,000exar_CommonStockSharesReceivedDissolution
/ invest_InvestmentIssuerAxis
= exar_CounterPathMember