Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income (loss)	$ (68,503)	$ (82,182)	$ 6,692
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Net cash provided by operating activities of discontinued operations	336	4,828	1,774
Depreciation and amortization	49,527	45,158	43,401
Amortization of debt discount and debt issuance costs	3,596	4,138	3,599
Equity loss from NEC TOKIN	7,090	1,254	0
Change in value of NEC TOKIN options	(3,111)	0	0
Net loss on sales and disposals of assets	32	18	318
Stock-based compensation expense	2,909	4,599	3,075
Pension and other post-retirement benefits	(78)	1,071	(2,991)
Deferred income taxes	(6,369)	(317)	(4,554)
Write down of long-lived assets	4,476	7,582	15,786
Write down of receivables	1,484	0	0
Goodwill impairment	0	1,092	0
Other, net	(521)	566	700
Changes in assets and liabilities:
Accounts receivable	(4,618)	4,882	42,603
Inventories	14,891	(323)	(1,385)
Prepaid expenses and other assets	3,748	(11,151)	(3,494)
Accounts payable	(2,070)	300	(15,829)
Accrued income taxes	172	(1,052)	(1,893)
Other operating liabilities	(9,737)	(3,290)	(7,072)
Net cash (used in) provided by operating activities	(6,746)	(22,827)	80,730
Investing activities:
Capital expenditures	(32,147)	(46,174)	(49,314)
Investment in NEC TOKIN (excludes non cash investment)	0	(50,917)	0
Change in restricted cash	4,047	(15,284)	0
Acquisitions, net of cash received	0	0	(42,613)
Proceeds from sales of assets	2,847	398	74
Net cash used in investing activities	(25,253)	(111,977)	(91,853)
Financing activities:
Proceeds from revolving line of credit	21,000	0	0
Payments of revolving line of credit	(2,551)	0	0
Proceeds from issuance of debt	0	39,825	116,050
Deferred acquisition payments	(21,977)	(16,900)	0
Payment of long-term debt	(3,599)	(1,909)	(40,581)
Net (payments) borrowings under other credit facilities	0	0	(3,154)
Debt issuance costs	0	(275)	(2,313)
Proceeds from exercise of stock options	250	111	290
Net cash provided by (used in) financing activities	(6,877)	20,852	70,292
Net (decrease) increase in cash and cash equivalents	(38,876)	(113,952)	59,169
Effect of foreign currency fluctuations on cash	827	(591)	(699)
Cash and cash equivalents at beginning of fiscal year	95,978	210,521	152,051
Cash and cash equivalents at end of fiscal year	57,929	95,978	210,521
Supplemental Cash Flow Statement Information:
Interest paid, net of capitalized interest	38,809	32,232	25,342
Income taxes paid	$ 5,521	$ 6,029	$ 7,078