Investment in NEC TOKIN - Equity Method Investment Income (Loss) Reconciliation (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 19, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]
Document Period End Date		Jun. 30, 2017
Income (Loss) from Equity Method Investments	$ 75,417	$ 75,417	$ 223
NEC TOKIN Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Net income (loss)	247,786
KEC’s economic interest %		34.00%
TOKIN [Member]
Schedule of Equity Method Investments [Line Items]
Net income (loss)			2,350
KEC’s economic interest %				34.00%
Equity Method Investment, Equity Income (Loss) Before Adjustments	84,247		799
Amortization and depreciation	(113)		(544)
Equity Method Investment, Removal of EMD Memo Accounts	(8,981)
Equity Method investment, Inventory Profit Elimination	24		(32)
Income (Loss) from Equity Method Investments	75,177	$ 123,100	$ 223
Acquired Equity Method Investment [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 240