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Note 3 - Business Combinations (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 28, 2014
Dec. 29, 2013
Oct. 31, 2014
Sep. 15, 2014
Jun. 03, 2014
Sep. 28, 2014
Jan. 14, 2014
Mar. 30, 2014
Jul. 05, 2013
Jul. 05, 2014
Note 3 - Business Combinations (Details) [Line Items]                        
Business Combination, Acquisition Related Costs $ 179,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 257,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 6,955,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 866,000us-gaap_BusinessCombinationAcquisitionRelatedCosts                
Amortization of Intangible Assets 2,533,000us-gaap_AmortizationOfIntangibleAssets 1,898,000us-gaap_AmortizationOfIntangibleAssets 9,215,000us-gaap_AmortizationOfIntangibleAssets 5,346,000us-gaap_AmortizationOfIntangibleAssets                
Allocated Share-based Compensation Expense 4,222,000us-gaap_AllocatedShareBasedCompensationExpense 2,557,000us-gaap_AllocatedShareBasedCompensationExpense 10,949,000us-gaap_AllocatedShareBasedCompensationExpense 7,267,000us-gaap_AllocatedShareBasedCompensationExpense                
Income Tax Expense (Benefit) 71,000us-gaap_IncomeTaxExpenseBenefit (1,405,000)us-gaap_IncomeTaxExpenseBenefit 870,000us-gaap_IncomeTaxExpenseBenefit (8,181,000)us-gaap_IncomeTaxExpenseBenefit                
Subsequent Event [Member] | Integrated Memory Logic Limited [Member]                        
Note 3 - Business Combinations (Details) [Line Items]                        
Payments to Acquire Businesses, Gross         18,900,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
             
Pro Forma [Member] | Integrated Memory Logic Limited [Member]                        
Note 3 - Business Combinations (Details) [Line Items]                        
Business Combination, Acquisition Related Costs (100,000)us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
0us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
(11,300,000)us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
0us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Amortization of Intangible Assets 0us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
2,400,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
2,400,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
7,300,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Allocated Share-based Compensation Expense 400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
700,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Increase (Decrease) in Intangible Assets, Current 0us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
(100,000)us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
(100,000)us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
(300,000)us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Stock or Unit Option Plan Expense (200,000)us-gaap_StockOptionPlanExpense
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
(200,000)us-gaap_StockOptionPlanExpense
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
(600,000)us-gaap_StockOptionPlanExpense
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
(300,000)us-gaap_StockOptionPlanExpense
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Income Tax Expense (Benefit) 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
600,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
(600,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
               
Integrated Memory Logic Limited [Member]                        
Note 3 - Business Combinations (Details) [Line Items]                        
Business Acquisition, Percentage of Voting Interests Acquired             92.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
8.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Payments to Acquire Businesses, Gross             206,411,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
         
Business Combination, Consideration Transferred             228,118,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
18,900,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)               1.5us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities               3,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Acquired Intangible Assets Discount Rate             16.90%exar_AcquiredIntangibleAssetsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
         
Goodwill, Acquired During Period     14,500,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
    14,500,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
           
Business Combination, Acquisition Related Costs 100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
  7,300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
                 
Stretch, Inc. [Member]                        
Note 3 - Business Combinations (Details) [Line Items]                        
Business Combination, Consideration Transferred                 10,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exar_StretchIncMember
     
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                 10,604,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= exar_StretchIncMember
     
Goodwill, Acquired During Period                 700,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= exar_StretchIncMember
700,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= exar_StretchIncMember
   
Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Period (in years)                 15 years      
Cadeka Microcircuits [Member]                        
Note 3 - Business Combinations (Details) [Line Items]                        
Business Combination, Consideration Transferred                       34,837,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exar_CadekaMicrocircuitsMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                       8,216,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= exar_CadekaMicrocircuitsMember
Goodwill, Acquired During Period                   $ 19,400,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= exar_CadekaMicrocircuitsMember
$ 19,400,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= exar_CadekaMicrocircuitsMember