Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
Net income (loss)	$ (4,925)	$ (38,456)
Operating Activities:
Depreciation and amortization	27,971	28,856
Equity (income) loss from NEC TOKIN	(271)	4,758
Non-cash debt and financing costs	561	649
Stock-based compensation expense	3,471	3,761
Receivable write down	64	24
Change in value of NEC TOKIN option	3,500	26,300
Net (gain) loss on sales and disposals of assets	307	(233)
Write down of long-lived assets	6,193	0
Pension and other post-retirement benefits	2,096	652
Change in deferred income taxes	819	735
Change in operating assets	21,459	4,762
Change in operating liabilities	(18,918)	(32,891)
Other	(183)	526
Net cash provided by (used in) operating activities	42,144	(557)
Investing activities:
Capital expenditures	(15,011)	(14,120)
Acquisitions, net of cash received	0	(2,892)
Proceeds from sale of assets	0	898
Net cash provided by (used in) investing activities	(15,011)	(16,114)
Financing activities:
Proceeds from revolving line of credit	0	10,000
Payments of revolving line of credit	0	(5,500)
Payments on long-term obligations	(2,428)	(481)
Proceeds from exercise of stock options	69
Purchase of treasury stock	(1,052)	(691)
Net cash provided by (used in) financing activities	(3,411)	3,328
Net increase (decrease) in cash and cash equivalents	23,722	(13,343)
Effect of foreign currency fluctuations on cash	(1,370)	139
Cash and cash equivalents at beginning of fiscal period	65,004	56,362
Cash and cash equivalents at end of fiscal period	$ 87,356	$ 43,158