Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Revenues [Abstract]
Net sales	$ 184,935	$ 187,590
Operating costs and expenses:
Cost of sales	142,412	147,877
Selling, general and administrative expenses	25,914	30,430
Research and development	6,932	6,274
Restructuring charges	688	1,824
Net (gain) loss on sales and disposals of assets	91	(58)
Total operating costs and expenses	176,037	186,347
Operating income (loss)	8,898	1,243
Non-operating (income) expense:
Interest income	3	3
Interest expense	9,923	10,013
Change in value of NEC TOKIN options	12,000	29,200
Other (income) expense, net	(2,394)	916
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	(10,628)	(38,883)
Income Tax Expense (Benefit)	(1,800)	248
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	(12,428)	(38,635)
Equity income (loss) from NEC TOKIN	223	1,585
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (12,205)	$ (37,050)
Net income (loss) per basic and diluted share:
Net income (loss) per basic and diluted share	$ (0.26)	$ (0.81)
Weighted-average shares outstanding:
Basic	46,349	45,552
Diluted	46,349	45,552