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Investment in NEC TOKIN Equity Loss (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]        
Equity income (loss) from NEC TOKIN $ 232 $ (1,243) $ (1,443) $ (4,620)
Nectokin Corporation
       
Schedule of Equity Method Investments [Line Items]        
Net income (loss) 2,454 (3,213) (700) (11,942)
KEMET's equity ownership % 34.00% 34.00% 34.00% 34.00%
Equity income (loss) from NEC TOKIN before Adjustments 834 (1,092) (238) (4,060)
Amortization and depreciation (602) (405) (1,205) (814)
Inventory valuation 0 254 0 254
Equity income (loss) from NEC TOKIN $ 232 $ (1,243) $ (1,443) $ (4,620)