Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Cash Flows [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (12,205)	$ (37,050)
Operating Activities:
Depreciation and amortization	9,436	9,917
Equity income (loss) from NEC TOKIN	223	1,585
Non-cash debt and financing costs	190	220
Stock-based compensation expense	1,228	1,279
Change in value of NEC TOKIN options	12,000	29,200
Net (gain) loss on sales and disposals of assets	91	(58)
Pension and other post-retirement benefits	709	127
Change in deferred income taxes	1,294	(934)
Change in operating assets	(2,357)	(20,201)
Change in operating liabilities	(13,088)	(2,673)
Other	(111)	234
Net cash provided by (used in) operating activities	(3,036)	(21,524)
Investing activities:
Capital expenditures	6,167	5,773
Payments to Acquire Investments	0	(2,892)
Net cash provided by (used in) investing activities	(6,167)	(8,665)
Financing activities:
Proceeds from revolving line of credit	0	8,000
Payments of revolving line of credit	0	(2,500)
Payments on long-term debt	(1,870)	(481)
Payments for Repurchase of Common Stock	595	544
Net cash provided by (used in) financing activities	(2,465)	4,475
Net increase (decrease) in cash and cash equivalents	11,668	25,714
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign currency fluctuations on cash	(398)	411
Cash and cash equivalents at beginning of fiscal period	65,004	56,362
Cash and cash equivalents at end of fiscal period	$ 52,938	$ 31,059