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Note 5 - Fair Value (Details) - Investment Assets Measured at Fair Value (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2014
Apr. 30, 2014
Assets:    
Investment assets $ 62us-gaap_AssetsFairValueDisclosure $ 157,056us-gaap_AssetsFairValueDisclosure
Liabilities:    
Investment liabilities   4,343us-gaap_LiabilitiesFairValueDisclosure
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets:    
Investment assets   9,378us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Investment assets   13,134us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
US Government Agencies Debt Securities [Member]    
Assets:    
Investment assets   22,512us-gaap_AssetsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Investment assets   2,772us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
US States and Political Subdivisions Debt Securities [Member]    
Assets:    
Investment assets   2,772us-gaap_AssetsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets:    
Investment assets   5us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Investment assets   71,248us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member]    
Assets:    
Investment assets   71,253us-gaap_AssetsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Investment assets   27,635us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Asset-backed Securities [Member]    
Assets:    
Investment assets   27,635us-gaap_AssetsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Investment assets   28,248us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Collateralized Mortgage Backed Securities [Member]    
Assets:    
Investment assets   28,248us-gaap_AssetsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Assets:    
Investment assets   4,636us-gaap_AssetsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Assets:    
Investment assets 6us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Investment assets 6us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 14,019us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] | CounterPath [Member]    
Assets:    
Investment assets 56us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= exar_CounterPathMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Investment assets 56us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 143,037us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] | Altior [Member]    
Liabilities:    
Investment liabilities   2,973us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_BusinessAcquisitionAxis
= exar_AltiorMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | Cadeka Microcircuits [Member]    
Liabilities:    
Investment liabilities   1,370us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_BusinessAcquisitionAxis
= exar_CadekaMicrocircuitsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member]    
Liabilities:    
Investment liabilities   4,343us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Money Market Funds [Member]    
Assets:    
Investment assets   4,636us-gaap_AssetsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
Altior [Member]    
Liabilities:    
Investment liabilities   2,973us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_BusinessAcquisitionAxis
= exar_AltiorMember
Cadeka Microcircuits [Member]    
Liabilities:    
Investment liabilities   1,370us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_BusinessAcquisitionAxis
= exar_CadekaMicrocircuitsMember
Money Market Funds [Member]    
Assets:    
Investment assets 6us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		  
CounterPath [Member]    
Assets:    
Investment assets $ 56us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= exar_CounterPathMember