Consolidated Statements of Earnings (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	$ 619,527	$ 611,255	$ 1,908,184	$ 1,779,294
Cost of goods sold	522,501	527,923	1,622,651	1,567,894
Gross margin	97,026	83,332	285,533	211,400
Selling, general and administrative expense	63,221	62,489	187,744	160,751
Impairment of long-lived assets			1,520
Restructuring and other expense	146	956	1,811	4,707
Joint venture transactions	253	1,812	(1,188)	3,835
Operating income	33,406	18,075	95,646	42,107
Other income (expense):
Miscellaneous income	596	728	1,064	1,408
Interest expense	(6,158)	(5,073)	(17,751)	(14,517)
Equity in net income of unconsolidated affiliates	25,716	24,005	73,580	70,614
Earnings before income taxes	53,560	37,735	152,539	99,612
Income tax expense	16,229	9,337	47,721	28,673
Net earnings	37,331	28,398	104,818	70,939
Net earnings attributable to noncontrolling interest	200	2,518	1,899	7,422
Net earnings attributable to controlling interest	$ 37,131	$ 25,880	$ 102,919	$ 63,517
Basic
Average common shares outstanding	69,791	68,972	68,998	69,952
Earnings per share attributable to controlling interest	$ 0.53	$ 0.38	$ 1.49	$ 0.91
Diluted
Average common shares outstanding	71,914	69,509	70,501	70,481
Earnings per share attributable to controlling interest	$ 0.52	$ 0.37	$ 1.46	$ 0.90
Common shares outstanding at end of period	70,168	69,014	70,168	69,014
Cash dividends declared per share	$ 0.26	$ 0.12	$ 0.52	$ 0.36