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Note 5 Other Assets (Narratives) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended
Dec. 12, 2014
Dec. 31, 2014
Dec. 31, 2014
Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments   $ 11,369us-gaap_EquityMethodInvestments $ 11,369us-gaap_EquityMethodInvestments $ 5,921us-gaap_EquityMethodInvestments
ATEC [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Investment Effective Date Dec. 12, 2014      
Equity Method Investment, Ownership Percentage 24.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ixys_AtecMember
     
Equity Method Investments 5,900us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ixys_AtecMember
     
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Impairment of Marketable Securities   $ 945us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
$ 945us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember