Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Cash Flows [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (29,856)	$ 2,790
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Gain on sale of discontinued operations	0	(5,809)
Net cash provided by (used in) operating activities of discontinued operations	0	(1,357)
Depreciation and amortization	19,182	20,974
Equity income (loss) from NEC TOKIN	1,747	(1,443)
Amortization of debt and financing costs	437	1,248
Stock-based compensation expense	2,607	1,952
Long-term receivable write down	0	59
Change in value of NEC TOKIN options	27,000	(10,700)
Net (gain) loss on sales and disposals of assets	(362)	(185)
Pension and other post-retirement benefits	333	37
Change in deferred income taxes	52	2,142
Change in operating assets	(14,474)	(4,268)
Change in operating liabilities	(14,514)	(6,341)
Other	410	(391)
Net cash provided by (used in) operating activities	(10,932)	1,594
Investing activities:
Capital expenditures	(9,268)	(11,975)
Payments to Acquire Investments	(2,892)	0
Proceeds from sale of assets	247	2,451
Change in restricted cash	0	558
Proceeds from sale of discontinued operations	0	10,125
Net cash provided by (used in) investing activities	(11,913)	1,159
Financing activities:
Proceeds from revolving line of credit	8,000	14,300
Payments of revolving line of credit	(3,500)	(7,500)
Deferred acquisition payments	0	(11,597)
Payments on long-term debt	(481)	(3,135)
Payments for Repurchase of Other Equity	(575)	0
Proceeds from exercise of stock options	0	25
Net cash provided by (used in) financing activities	3,444	(7,907)
Net increase (decrease) in cash and cash equivalents	19,401	5,154
Effect of foreign currency fluctuations on cash	354	(1,199)
Cash and cash equivalents at beginning of fiscal period	56,362	57,929
Cash and cash equivalents at end of fiscal period	$ 37,315	$ 51,576