Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Net sales	$ 984,833	$ 1,018,488	$ 736,335
Operating costs and expenses:
Cost of sales	775,670	752,846	611,638
Selling, general and administrative expenses	111,564	104,607	86,085
Research and development	29,440	25,864	22,064
Restructuring charges	14,254	7,171	9,198
Net (gain) loss on sales and disposals of assets	318	(1,261)	(1,003)
Write down of long-lived assets	15,786		656
Total operating costs and expenses	947,032	889,227	728,638
Operating income	37,801	129,261	7,697
Other (income) expense:
Interest income	(175)	(218)	(188)
Interest expense	28,567	30,175	26,008
Other (income) expense, net	965	(4,692)	4,121
(Gain) loss on early extinguishment of debt		38,248	(38,921)
Increase in value of warrant			81,088
Income (loss) before income taxes	8,444	65,748	(64,411)
Income tax expense	1,752	2,704	5,036
Net income (loss)	$ 6,692	$ 63,044	$ (69,447)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.15	$ 2.11	$ (2.57)
Diluted (in dollars per share)	$ 0.13	$ 1.22	$ (2.57)
Weighted-average shares outstanding:
Basic (in shares)	43,285	29,847	26,971
Diluted (in shares)	52,320	51,477	26,971