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Note 8 Goodwill and Intangible Assets (Narratives) (Details) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended
Jun. 27, 2013
Jun. 30, 2014
Dec. 31, 2014
MCU Business [Member]      
Goodwill and Intangible Assets Details [Line Items]      
Business Acquisition, Effective Date of Acquisition Jun. 27, 2013    
Goodwill, Acquired During Period $ 25,164,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= ixys_McuBusinessMember
   
Other Acquisition [Member]      
Business Acquisition [Line Items]      
Goodwill, Translation Adjustments     (304,000)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_BusinessAcquisitionAxis
= ixys_OtherAcquisitionMember
Goodwill and Intangible Assets Details [Line Items]      
Goodwill, Acquired During Period   $ 2,800,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= ixys_OtherAcquisitionMember