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Note 3 - Business Combinations (Details) - Fair Value Allocated to Tangible and Identifiable Intangible Assets (USD $)
In Thousands, unless otherwise specified
0 Months Ended 1 Months Ended
Jun. 03, 2014
Sep. 28, 2014
Dec. 28, 2014
Mar. 30, 2014
Mar. 31, 2013
Identifiable tangible assets (liabilities)          
Goodwill     $ 44,871us-gaap_Goodwill $ 30,410us-gaap_Goodwill $ 10,356us-gaap_Goodwill
Integrated Memory Logic Limited [Member]          
Identifiable tangible assets (liabilities)          
Cash 133,752us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Accounts receivable 10,096us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Inventories 3,950us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Other current assets 962us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Property, plant and equipment 480us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Other assets 308us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Current liabilities (12,356)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Long-term liabilities (3,595)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Total identifiable tangible assets (liabilities), net 133,597exar_BusinessCombinationTotalIdentifiableTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Identifiable intangible assets 80,060us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Total identifiable assets, net 213,657us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Goodwill 14,461us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
       
Fair value of total consideration transferred $ 228,118us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember
$ 18,900us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exar_IntegratedMemoryLogicLimitedMember