Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 2,790	$ (48,236)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Gain on sale of discontinued operations	(5,809)	0
Net cash provided by (used in) operating activities of discontinued operations	(1,357)	933
Depreciation and amortization	20,974	25,590
Equity (income) loss from NEC TOKIN	1,443	4,620
Amortization of debt and financing costs	1,332	1,959
Stock-based compensation expense	1,952	1,628
Long-term receivable write down	59	1,444
Change in value of NEC TOKIN options	(10,700)	382
Net (gain) loss on sales and disposals of assets	(185)	42
Pension and other post-retirement benefits	37	27
Change in deferred income taxes	2,142	(957)
Change in operating assets	(4,268)	(8,261)
Change in operating liabilities	(6,341)	(10,932)
Other	(475)	155
Net cash provided by (used in) operating activities	1,594	(31,606)
Investing activities:
Capital expenditures	(11,975)	(18,337)
Proceeds from sale of assets	2,451	0
Change in restricted cash	558	2,874
Proceeds from sale of discontinued operations	10,125	0
Net cash provided by (used in) investing activities	1,159	(15,463)
Financing activities:
Proceeds from revolving line of credit	14,300	21,000
Payments of revolving line credit	(7,500)	0
Deferred acquisition payments	(11,597)	(11,452)
Payments of long-term debt	(3,135)	(1,422)
Proceeds from exercise of stock options	25	57
Net cash provided by (used in) financing activities	(7,907)	8,183
Net increase (decrease) in cash and cash equivalents	(5,154)	(38,886)
Effect of foreign currency fluctuations on cash	(1,199)	608
Cash and cash equivalents at beginning of fiscal period	57,929	95,978
Cash and cash equivalents at end of fiscal period	$ 51,576	$ 57,700