Investment in NEC TOKIN NEC Tokin Equity Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ (6,505)	$ 1,367	$ (4,758)	$ (76)
Nectokin Corporation
Schedule of Equity Method Investments [Line Items]
Net income (loss)	$ (17,867)	$ 5,628	$ (10,606)	$ 4,928
KEC's economic interest %	34.00%	34.00%	34.00%	34.00%
Equity income (loss) from NEC TOKIN before adjustments	$ (6,075)	$ 1,914	$ (3,606)	$ 1,676
Amortization and depreciation	(494)	(547)	(1,118)	(1,752)
Inventory profit elimination	64	0	(34)	0
Income (Loss) from Equity Method Investments	$ (6,505)	$ 1,367	$ (4,758)	$ (76)