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Note 9 - Short-term Debt (Details) (USD $)
9 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 28, 2014
May 27, 2014
Jun. 29, 2014
Jun. 09, 2014
Sep. 28, 2014
Note 9 - Short-term Debt (Details) [Line Items]          
Proceeds from Issuance of Debt (in Dollars) $ 91,000,000us-gaap_ProceedsFromIssuanceOfDebt        
Repayments of Debt (in Dollars) 91,000,000us-gaap_RepaymentsOfDebt        
Scenario 1 [Member] | Term Loan Credit Facility [Member] | Bridge Facility [Member] | Initial Duration Following the Initial Funding Date [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 7.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= exar_Scenario1Member
/ us-gaap_VariableRateAxis
= exar_InitialDurationFollowingTheInitialFundingDateMember
       
Scenario 1 [Member] | Term Loan Credit Facility [Member] | Bridge Facility [Member] | After the Initial Duration Following the Initial Funding Date [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 8.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= exar_Scenario1Member
/ us-gaap_VariableRateAxis
= exar_AfterTheInitialDurationFollowingTheInitialFundingDateMember
       
Scenario 1 [Member] | Term Loan Credit Facility [Member] | Bridge Facility [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Initial Duration Following the Initial Funding Date 90 days        
Scenario 2 [Member] | Term Loan Credit Facility [Member] | Bridge Facility [Member] | Initial Duration Following the Initial Funding Date [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 8.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= exar_Scenario2Member
/ us-gaap_VariableRateAxis
= exar_InitialDurationFollowingTheInitialFundingDateMember
       
Scenario 2 [Member] | Term Loan Credit Facility [Member] | Bridge Facility [Member] | After the Initial Duration Following the Initial Funding Date [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 9.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= exar_Scenario2Member
/ us-gaap_VariableRateAxis
= exar_AfterTheInitialDurationFollowingTheInitialFundingDateMember
       
Scenario 2 [Member] | Term Loan Credit Facility [Member] | Bridge Facility [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Initial Duration Following the Initial Funding Date 90 days        
Term Loan Credit Facility [Member] | Bridge Facility [Member] | Federal Funds Effective Swap Rate [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_FederalFundsEffectiveSwapRateMember
       
Term Loan Credit Facility [Member] | Bridge Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum 1.50%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Term Loan Credit Facility [Member] | Bridge Facility [Member] | Base Rate [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum 2.50%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
       
Term Loan Credit Facility [Member] | Bridge Facility [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Proceeds from Issuance of Debt (in Dollars)   65,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
     
Debt Instrument, Face Amount (in Dollars)   90,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
     
Repayments of Debt (in Dollars)     26,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= exar_BridgeFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= exar_TermLoanCreditFacilityMember
   
CTBC [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Proceeds from Issuance of Debt (in Dollars)       26,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= exar_CTBCMember
 
Debt Instrument, Interest Rate, Stated Percentage       3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= exar_CTBCMember
 
Certificates of Deposit [Member]          
Note 9 - Short-term Debt (Details) [Line Items]          
Restricted Cash and Cash Equivalents, Current (in Dollars)         $ 26,000,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember