Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Net sales	$ 666,035	$ 602,387
Cost of goods sold	572,384	530,925
Gross margin	93,651	71,462
Selling, general and administrative expense	59,422	45,361
Impairment of long-lived assets	1,570
Restructuring and other expense	403	1,703
Joint venture transactions	(1,162)	3,215
Operating income	33,418	21,183
Other income (expense):
Miscellaneous income	165	401
Interest expense	(5,259)	(4,688)
Equity in net income of unconsolidated affiliates	22,643	24,697
Earnings before income taxes	50,967	41,593
Income tax expense	16,102	13,252
Net earnings	34,865	28,341
Net earnings attributable to noncontrolling interest	903	2,688
Net earnings attributable to controlling interest	$ 33,962	$ 25,653
Basic
Average common shares outstanding	68,278	71,518
Earnings per share attributable to controlling interest	$ 0.50	$ 0.36
Diluted
Average common shares outstanding	69,571	72,418
Earnings per share attributable to controlling interest	$ 0.49	$ 0.35
Common shares outstanding at end of period	68,679	70,042
Cash dividends declared per share	$ 0.13	$ 0.12