Investment in NEC TOKIN (Details) (USD $)	3 Months Ended			3 Months Ended			3 Months Ended	0 Months Ended			3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 KEC Stockholders' Agreement	Jun. 30, 2014 NEC TOKIN	Jun. 30, 2013 NEC TOKIN	Feb. 01, 2013 NEC TOKIN Stockholders' Agreement director_position	Jun. 30, 2014 NEC TOKIN Put Option	Feb. 01, 2013 NEC TOKIN KEC Stock Purchase Agreement	Mar. 12, 2012 NEC TOKIN KEC Stock Purchase Agreement	Feb. 01, 2013 NEC TOKIN KEC Stockholders' Agreement director_position	Jun. 30, 2014 NEC TOKIN KEC Option Agreement number_of_times	Jun. 30, 2014 NEC TOKIN KEC Put Option number_of_times
Schedule of Equity Method Investments [Line Items]
Common stock acquired (as a percent)									51.00%
Economic ownership to be acquired (as a percent)				34.00%	34.00%				34.00%		49.00%
Purchase price paid								$ 50,000,000
Number of director positions						7				4
Purchase price for expected additional shares that may be acquired											50,000,000
Ownership interest maintained after acquisition of additional shares (as a percent)											51.00%
LTM EBITDA multiple											6	6
Gain recognized included in the Other expense, net	4,100,000	0					4,100,000
Summarized financial information
Current assets				239,025,000	245,709,000
Non-current assets				311,389,000	302,161,000
Current liabilities				128,076,000	120,929,000
Non-current liabilities				358,014,000	360,908,000
245709				122,408,000	123,192,000
302161				26,678,000	18,300,000
120929				(3,154,000)	(8,729,000)
Excess of the carrying value for its investment over equity in memo accounts				21,869,000	22,451,000
Net sales				1,900,000
Accounts receivable				1,600,000
Receivable balances			$ 600,000