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Note 3 Business Combination (Details) (Purchase Price Allocation) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 27, 2013
Business Acquisition [Line Items]      
Goodwill, Acquired in Acquisition During Period $ 2,781us-gaap_GoodwillAcquiredDuringPeriod $ 25,164us-gaap_GoodwillAcquiredDuringPeriod  
MCU Business [Member]      
Business Acquisition [Line Items]      
Inventories     800us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ixys_McuBusinessMember
Property, Plant and Equipment     36us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ixys_McuBusinessMember
Identifiable Intangible Assets     24,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= ixys_McuBusinessMember
Total Identifiable Net Assets     24,836us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= ixys_McuBusinessMember
Goodwill, Acquired in Acquisition During Period     25,164us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= ixys_McuBusinessMember
Total Purchase Price     $ 50,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ixys_McuBusinessMember