Condensed Consolidating Financial Statements Income Statement (Details 2) - USD ($) $ 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
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 Subsidiaries, before Tax	0	0
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)
Income (Loss) from Equity Method Investments	223	1,585
Net Income (Loss) Attributable to Parent	(12,205)	(37,050)
Parent
Revenues [Abstract]
Net sales	0	0
Operating costs and expenses:
Cost of sales	277	178
Selling, general and administrative expenses	10,145	9,816
Research and development	65	(119)
Restructuring charges	0	0
Net (gain) loss on sales and disposals of assets	0	0
Total operating costs and expenses	10,487	9,875
Operating income (loss)	(10,487)	(9,875)
Interest income	0	0
Interest Expense	9,423	9,469
Change in value of NEC TOKIN options	0	0
Other (income) expense, net	9,350	9,087
Income (Loss) from Subsidiaries, before Tax	(1,645)	(26,793)
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	(12,205)	(37,050)
Income Tax Expense (Benefit)	0	0
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	(12,205)	(37,050)
Income (Loss) from Equity Method Investments	0	0
Net Income (Loss) Attributable to Parent	(12,205)	(37,050)
Guarantor Subsidiaries
Revenues [Abstract]
Net sales	213,513	221,770
Operating costs and expenses:
Cost of sales	167,103	181,514
Selling, general and administrative expenses	17,489	23,479
Research and development	4,375	4,384
Restructuring charges	139	515
Net (gain) loss on sales and disposals of assets	388	(353)
Total operating costs and expenses	189,494	209,539
Operating income (loss)	24,019	12,231
Interest income	3	0
Interest Expense	399	332
Change in value of NEC TOKIN options	12,000	29,200
Other (income) expense, net	(9,416)	(7,802)
Income (Loss) from Subsidiaries, before Tax	0	0
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	2,201	(25,103)
Income Tax Expense (Benefit)	38	(487)
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	2,163	(24,616)
Income (Loss) from Equity Method Investments	223	1,585
Net Income (Loss) Attributable to Parent	2,386	(23,031)
Non-Guarantor Subsidiaries
Revenues [Abstract]
Net sales	170,550	181,600
Operating costs and expenses:
Cost of sales	161,230	166,230
Selling, general and administrative expenses	11,210	12,870
Research and development	2,492	2,009
Restructuring charges	549	1,309
Net (gain) loss on sales and disposals of assets	(297)	295
Total operating costs and expenses	175,184	182,713
Operating income (loss)	(4,634)	(1,113)
Interest income	(6)	(3)
Interest Expense	101	212
Change in value of NEC TOKIN options	0	0
Other (income) expense, net	2,460	(2,201)
Income (Loss) from Subsidiaries, before Tax	0	0
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	(2,269)	(3,523)
Income Tax Expense (Benefit)	1,762	239
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	(4,031)	(3,762)
Income (Loss) from Equity Method Investments	0	0
Net Income (Loss) Attributable to Parent	(4,031)	(3,762)
Reclassifications and Eliminations
Revenues [Abstract]
Net sales	(199,128)	(215,780)
Operating costs and expenses:
Cost of sales	(186,198)	(200,045)
Selling, general and administrative expenses	(12,930)	(15,735)
Research and development	0	0
Restructuring charges	0	0
Net (gain) loss on sales and disposals of assets	0	0
Total operating costs and expenses	(199,128)	(215,780)
Operating income (loss)	0	0
Interest income	0	0
Interest Expense	0	0
Change in value of NEC TOKIN options	0
Other (income) expense, net	0	0
Income (Loss) from Subsidiaries, before Tax	1,645	26,793
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	1,645	26,793
Income Tax Expense (Benefit)	0	0
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	1,645	26,793
Income (Loss) from Equity Method Investments	0	0
Net Income (Loss) Attributable to Parent	$ 1,645	$ 26,793