Condensed Consolidating Financial Statements (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Consolidating Statement of Operations
Net sales	$ 187,590	$ 212,881
Operating costs and expenses:
Cost of sales	147,877	179,924
Selling, general and administrative expenses	30,430	24,779
Research and development	6,274	6,589
Restructuring charges	1,824	1,830
Net (gain) loss on sales and disposals of assets	(58)	365
Total operating costs and expenses	186,347	213,487
Operating income (loss)	1,243	(606)
Interest income	(3)	(3)
Interest expense	10,013	10,456
Change in value of NEC TOKIN options	29,200	(4,100)
Other Nonoperating Income (Expense)	916	567
Equity in earnings of subsidiaries	0	0
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	(38,883)	(7,526)
Income tax expense (benefit)	(248)	1,282
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	(38,635)	(8,808)
Equity income (loss) from NEC TOKIN	1,585	(1,675)
Income (loss) from continuing operations	(37,050)	(10,483)
Income (loss) from discontinued operations, net of income tax expense (benefit) of $0 and $918, respectively	0	6,943
Net income (loss)	(37,050)	(3,540)
Parent
Condensed Consolidating Statement of Operations
Net sales	0	54
Operating costs and expenses:
Cost of sales	178	464
Selling, general and administrative expenses	9,816	11,089
Research and development	(119)	66
Restructuring charges	0	0
Net (gain) loss on sales and disposals of assets	0	0
Total operating costs and expenses	9,875	11,619
Operating income (loss)	(9,875)	(11,565)
Interest income	0	0
Interest expense	9,469	9,799
Other Nonoperating Income (Expense)	(9,087)	(10,827)
Equity in earnings of subsidiaries	26,793	(6,997)
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	(37,050)	(3,540)
Income tax expense (benefit)	0	0
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	(37,050)	(3,540)
Equity income (loss) from NEC TOKIN	0	0
Income (loss) from continuing operations	(37,050)	(3,540)
Income (loss) from discontinued operations, net of income tax expense (benefit) of $0 and $918, respectively		0
Net income (loss)	(37,050)	(3,540)
Guarantor Subsidiaries
Condensed Consolidating Statement of Operations
Net sales	221,770	255,576
Operating costs and expenses:
Cost of sales	181,514	222,672
Selling, general and administrative expenses	23,479	17,153
Research and development	4,384	4,349
Restructuring charges	515	371
Net (gain) loss on sales and disposals of assets	(353)	188
Total operating costs and expenses	209,539	244,733
Operating income (loss)	12,231	10,843
Interest income	0	0
Interest expense	332	400
Change in value of NEC TOKIN options	29,200	(4,100)
Other Nonoperating Income (Expense)	7,802	11,544
Equity in earnings of subsidiaries	0	0
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	(25,103)	2,999
Income tax expense (benefit)	(487)	23
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	(24,616)	2,976
Equity income (loss) from NEC TOKIN	1,585	(1,675)
Income (loss) from continuing operations	(23,031)	1,301
Income (loss) from discontinued operations, net of income tax expense (benefit) of $0 and $918, respectively		(488)
Net income (loss)	(23,031)	813
Non-Guarantor Subsidiaries
Condensed Consolidating Statement of Operations
Net sales	181,600	201,219
Operating costs and expenses:
Cost of sales	166,230	184,907
Selling, general and administrative expenses	12,870	12,386
Research and development	2,009	2,174
Restructuring charges	1,309	1,459
Net (gain) loss on sales and disposals of assets	295	177
Total operating costs and expenses	182,713	201,103
Operating income (loss)	(1,113)	116
Interest income	(3)	(3)
Interest expense	212	257
Other Nonoperating Income (Expense)	2,201	(150)
Equity in earnings of subsidiaries	0	0
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	(3,523)	12
Income tax expense (benefit)	239	1,259
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	(3,762)	(1,247)
Equity income (loss) from NEC TOKIN	0	0
Income (loss) from continuing operations	(3,762)	(1,247)
Income (loss) from discontinued operations, net of income tax expense (benefit) of $0 and $918, respectively		7,431
Net income (loss)	(3,762)	6,184
Reclassifications and Eliminations
Condensed Consolidating Statement of Operations
Net sales	(215,780)	(243,968)
Operating costs and expenses:
Cost of sales	(200,045)	(228,119)
Selling, general and administrative expenses	(15,735)	(15,849)
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	(215,780)	(243,968)
Operating income (loss)	0	0
Interest income	0	0
Interest expense	0	0
Other Nonoperating Income (Expense)	0	0
Equity in earnings of subsidiaries	(26,793)	6,997
Income (loss) from continuing operations before income taxes and equity income (loss) from NEC TOKIN	26,793	(6,997)
Income tax expense (benefit)	0	0
Income (loss) from continuing operations before equity income (loss) from NEC TOKIN	26,793	(6,997)
Equity income (loss) from NEC TOKIN	0	0
Income (loss) from continuing operations	26,793	(6,997)
Income (loss) from discontinued operations, net of income tax expense (benefit) of $0 and $918, respectively		0
Net income (loss)	$ 26,793	$ (6,997)