Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income (loss)	$ (53,629)	$ (14,143)	$ (68,503)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Gain on sale of discontinued operations	0	5,644	0
Net cash provided by (used in) operating activities of discontinued operations	0	(679)	336
Depreciation and amortization	39,016	40,768	49,527
Non-cash debt and financing costs	859	2,032	3,596
Gain on early extinguishment of debt	0	(1,003)	0
Equity (income) loss from NEC TOKIN	16,406	2,169	7,090
Change in value of NEC TOKIN options	(26,300)	2,100	3,111
Net (gain) loss on sales and disposals of assets	375	(221)	32
Stock-based compensation expense	4,774	4,512	2,909
Non-cash pension and other post-retirement benefits	3,013	2,742	2,642
Deferred income taxes	495	(2,084)	(6,369)
Write down of long-lived assets	0	0	4,476
Write down of receivables	24	52	1,484
Other, net	306	(7)	(521)
Changes in assets and liabilities:
Accounts receivable	(2,346)	8,220	(4,618)
Inventories	3,338	8,559	14,891
Prepaid expenses and other assets	13,588	(8,404)	3,748
Accounts payable	(5,982)	(2,879)	(2,070)
Accrued income taxes	(382)	(232)	252
Other operating liabilities	(13,790)	(7,256)	(12,537)
Net cash provided by (used in) operating activities	32,365	24,402	(6,746)
Investing activities:
Capital expenditures	(20,469)	(22,232)	(32,147)
Change in restricted cash	1,802	11,509	4,047
Acquisitions, net of cash received	2,892	0	0
Proceeds from sale of discontinued operations	0	9,564	0
Proceeds from sale of assets	971	4,788	2,847
Net cash provided by (used in) investing activities	(20,588)	3,629	(25,253)
Financing activities:
Proceeds from revolving line of credit	10,000	42,340	21,000
Payments of revolving line of credit	(9,600)	(27,342)	(2,551)
Deferred acquisition payments	(3,000)	(19,527)	(21,977)
Payment of long-term debt	(481)	(21,733)	(3,599)
Proceeds from exercise of stock options	0	24	250
Purchase of treasury stock	(722)	(630)	0
Net cash provided by (used in) financing activities	(3,803)	(26,868)	(6,877)
Net increase (decrease) in cash and cash equivalents	7,974	1,163	(38,876)
Effect of foreign currency fluctuations on cash	668	(2,730)	827
Cash and cash equivalents at beginning of fiscal year	56,362	57,929	95,978
Cash and cash equivalents at end of fiscal year	65,004	56,362	57,929
Supplemental Cash Flow Statement Information:
Interest paid, net of capitalized interest	39,091	39,008	38,809
Income taxes paid	$ 4,892	$ 6,611	$ 5,521