Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Nov. 30, 2010	Nov. 30, 2011	Nov. 30, 2010
Consolidated Statements Of Operations [Abstract]
NET SALES	$ 148,111	$ 337,811	$ 320,233
Cost of products sold	136,044	321,240	292,058
GROSS PROFIT	12,067	16,571	28,175
Selling, general and administrative	18,543	31,681	34,684
Restructuring charges		3,216
Interest	13,886	18,298	28,297
Loss on debt retirements	613		29,619
Other income	(1,929)	(7,399)	(6,819)
TOTAL EXPENSES	31,113	45,796	85,781
LOSS BEFORE INCOME TAXES	(19,046)	(29,225)	(57,606)
Income tax benefit	(7,845)	(768)	(22,713)
NET LOSS	$ (11,201)	$ (28,457)	$ (34,893)
Net loss per share
Basic	$ (0.40)	$ (1.02)	$ (1.25)
Diluted	$ (0.40)	$ (1.02)	$ (1.25)
Average shares outstanding
Basic	27,807	27,878	27,797
Diluted	27,807	27,878	27,797
Cash dividends declared per share	$ 0.075	$ 0.075	$ 0.15