Investment in NEC TOKIN (Details 4) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]
Investment in TOKIN	$ 63,416	$ 20,334
NECTOKIN
Schedule of Equity Method Investments [Line Items]
Investment in TOKIN	63,416	20,334
Purchase price accounting basis adjustment:
Property, plant and equipment (1)	3,080	3,365
Technology (1)	(8,691)	(10,134)
Long-term debt (1)	(1,067)	(1,975)
Goodwill	(7,590)	(7,555)
Equity Method Investment, Indemnity Asset	(8,500)	(8,500)
Equity Method investment, Purchase Price Adjustment, Inventory Profit Elimination	208	371
Other	(569)	(603)
KEMET’s 34% interest of TOKIN’s equity	$ 40,287	$ (4,697)