Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Feb. 28, 2013		Feb. 29, 2012		Feb. 28, 2013		Feb. 29, 2012
NET SALES	$ 141,359		$ 121,894		$ 483,575		$ 435,696
Cost of products sold	129,035		123,774		444,297		425,464
GROSS PROFIT	12,324		(1,880)		39,278		10,232
Selling, general and administrative	17,056		17,265		51,679		46,774
Restructuring charges	0		0		0		3,153
Interest	7,227		8,512		22,462		26,810
Other income	(2,091)		(1,332)		(6,614)		(8,725)
TOTAL EXPENSES	22,192		24,445		67,527		68,012
LOSS BEFORE INCOME TAXES FROM CONTINUING OPERATIONS	(9,868)		(26,325)		(28,249)		(57,780)
Income taxes (benefit)	(1,355)		(1,148)		(2,151)		(2,601)
NET LOSS FROM CONTINUING OPERATIONS	(8,513)		(25,177)		(26,098)		(55,179)
NET INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX	2,699		897		6,504		2,442
NET LOSS	$ (5,814)		$ (24,280)		$ (19,594)		$ (52,737)
NET LOSS PER SHARE FROM CONTINUING OPERATIONS:
Basic (in USD per share)	$ (0.30)		$ (0.90)		$ (0.93)		$ (1.98)
Diluted (in USD per share)	$ (0.30)		$ (0.90)		$ (0.93)		$ (1.98)
NET INCOME FROM DISCONTINUED OPERATIONS:
Basic (in USD per share)	$ 0.09		$ 0.03		$ 0.23		$ 0.09
Diluted (in USD per share)	$ 0.09		$ 0.03		$ 0.23		$ 0.09
NET LOSS PER SHARE:
Basic (in USD per share)	$ (0.21)		$ (0.87)		$ (0.70)		$ (1.89)
Diluted (in USD per share)	$ (0.21)		$ (0.87)		$ (0.70)		$ (1.89)
AVERAGE SHARES OUTSTANDING
Basic (in shares)	28,190		27,926		28,073		27,894
Diluted (in shares)	28,190	[1]	27,926	[1]	28,073	[1]	27,894	[1]
CASH DIVIDENDS DECLARED PER SHARE (in USD per share)	$ 0		$ 0		$ 0		$ 0.075

[1] Shares excluded due to antidilutive effect of stock options, restricted shares and awards