Investment in NEC TOKIN Equity Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]
Equity income (loss) from NEC TOKIN	$ 1,585	$ (1,675)
NEC TOKIN
Schedule of Equity Method Investments [Line Items]
Net income (loss)	$ 5,255	$ (3,154)
KEMET's economic interest %	34.00%	34.00%
Equity income (loss) from NEC TOKIN before adjustments	$ 1,787	$ (1,072)
Amortization and depreciation	(136)	(603)
Inventory valuation	(66)	0
Equity income (loss) from NEC TOKIN	$ 1,585	$ (1,675)