Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income (loss)	$ 47,989	$ (53,629)	$ (14,143)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Gain on sale of discontinued operations	0	0	5,644
Net cash provided by (used in) operating activities of discontinued operations	0	0	(679)
Depreciation and amortization	37,338	39,016	40,768
Non-cash debt and financing costs	761	859	2,032
Gain on early extinguishment of debt	0	0	(1,003)
Equity (income) loss from NEC TOKIN	(41,643)	16,406	2,169
Change in value of TOKIN options	10,700	(26,300)	2,100
Net (gain) loss on sales and disposals of assets	392	375	(221)
Stock-based compensation expense	4,720	4,774	4,512
Non-cash pension and other post-retirement benefits	2,543	3,013	2,742
Deferred income taxes	(19)	495	(2,084)
Write down of long-lived assets	10,279	0	0
Write down of receivables	64	24	52
Other, net	(327)	306	(7)
Changes in assets and liabilities:
Accounts receivable	(12)	(2,346)	8,220
Inventories	16,805	3,338	8,559
Prepaid expenses and other assets	(1,769)	13,588	(8,404)
Accounts payable	6,170	(5,982)	(2,879)
Accrued income taxes	144	(382)	(232)
Other operating liabilities	(1,068)	(13,790)	(7,256)
Net cash provided by (used in) operating activities	71,667	32,365	24,402
Investing activities:
Capital expenditures	(25,617)	(20,469)	(22,232)
Change in restricted cash	0	1,802	11,509
Acquisitions, net of cash received	0	2,892	0
Proceeds from sale of discontinued operations	0	0	9,564
Proceeds from sale of assets	19	971	4,788
Net cash provided by (used in) investing activities	(25,598)	(20,588)	3,629
Financing activities:
Proceeds from revolving line of credit	12,000	10,000	42,340
Payments of revolving line of credit	(12,000)	(9,600)	(27,342)
Proceeds from issuance of debt	2,314	0	0
Deferred acquisition payments	0	(3,000)	(19,527)
Payment of long-term debt	(2,428)	(481)	(21,733)
Proceeds from exercise of stock options	1,133	0	24
Purchase of treasury stock	(1,144)	(722)	(630)
Net cash provided by (used in) financing activities	(125)	(3,803)	(26,868)
Net increase (decrease) in cash and cash equivalents	45,944	7,974	1,163
Effect of foreign currency fluctuations on cash	(1,174)	668	(2,730)
Cash and cash equivalents at beginning of fiscal year	65,004	56,362	57,929
Cash and cash equivalents at end of fiscal year	109,774	65,004	56,362
Supplemental Cash Flow Statement Information:
Interest paid, net of capitalized interest	38,922	39,091	39,008
Income taxes paid	$ 4,153	$ 4,892	$ 6,611