Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Components of Income (loss) before income taxes
Domestic (U.S.)	$ (89,529)	$ (88,939)	$ (4,591)
Foreign (Outside U.S.)	33,232	14,962	3,317
Loss from continuing operations before income taxes and equity loss from NEC TOKIN	(56,297)	(73,977)	(1,274)
Current:
Federal	0	0	(938)
State and local	35	37	49
Foreign	7,816	3,561	6,519
Total current income tax expense from continuing operations	7,851	3,598	5,630
Deferred:
Federal	(1,694)	(65)	11
State and local	406	700	(394)
Foreign	(5,081)	(952)	(4,171)
Deferred tax benefit from continuing operations	(6,369)	(317)	(4,554)
Income tax expense	$ 1,482	$ 3,281	$ 1,076