Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 12,278	$ (8,600)	$ (4,925)	$ (38,456)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Foreign currency translation gains (losses)	(10,773)	(6,121)	(17,848)	(4,722)
Defined benefit pension plans, net of tax impact	165	6,910	492	7,322
Post-retirement plan adjustments	116	96	31	17
Equity interest in NEC TOKIN’s other comprehensive income (loss)	6,161	143	598	(4,463)
Foreign exchange contracts	(1,166)	672	(2,872)	(3,045)
Other comprehensive income (loss)	(5,497)	1,700	(19,599)	(4,891)
Total comprehensive income (loss)	$ 6,781	$ (6,900)	$ (24,524)	$ (43,347)