Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Operating activities:
Net income (loss)	$ 6,692	$ 63,044	$ (69,447)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	44,124	52,932	52,644
Amortization of debt discount and debt issuance costs	3,599	4,930	13,392
Net (gain) loss on sales and disposals of assets	318	(1,261)	(1,003)
Stock-based compensation expense	3,075	1,783	1,865
Pension and other post-retirement benefits	(2,991)	(2,319)	(2,716)
Deferred income taxes	(4,554)	(3,403)	2,051
Write down of long-lived assets	15,786		656
(Gain) loss on early extinguishment of debt		38,248	(38,921)
Increase in value of warrant			81,088
Other, net	702	(2,446)	339
Changes in assets and liabilities:
Accounts receivable	47,298	(15,423)	(18,236)
Other receivables	(3,698)	957	(27)
Inventories	5,375	(48,817)	7,168
Prepaid expenses and other current assets	(2,484)	(6,647)	(5,647)
Accounts payable	(22,052)	9,567	26,605
Accrued income taxes	(1,893)	4,315	421
Other operating liabilities	(8,567)	18,508	4,388
Net cash provided by operating activities	80,730	113,968	54,620
Investing activities:
Capital expenditures	(49,314)	(34,989)	(12,921)
Acquisitions, net of cash received	(42,613)
Proceeds from sales of assets	74	5,425	1,500
Net cash used in investing activities	(91,853)	(29,564)	(11,421)
Financing activities:
Proceeds from issuance of debt	116,050	227,525	58,949
Payment of long-term debt	(40,581)	(230,413)	(54,525)
Net (payments) borrowings under other credit facilities	(3,154)	(2,479)	475
Debt issuance costs	(2,313)	(7,853)	(4,206)
Proceeds from exercise of stock options	290	89
Debt extinguishment costs		(207)	(3,605)
Net cash provided by (used in) financing activities	70,292	(13,338)	(2,912)
Net increase in cash and cash equivalents	59,169	71,066	40,287
Effect of foreign currency fluctuations on cash	(699)	1,786	(292)
Cash and cash equivalents at beginning of fiscal year	152,051	79,199	39,204
Cash and cash equivalents at end of fiscal year	210,521	152,051	79,199
Supplemental Cash Flow Statement Information:
Interest paid, net of capitalized interest	25,342	17,304	16,107
Income taxes paid	$ 7,078	$ 2,408	$ 3,910