Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Consolidated Statements Of Earnings
Net sales	$ 602,387	$ 616,805
Cost of goods sold	530,925	537,891
Gross margin	71,462	78,914
Selling, general and administrative expense	45,361	56,778
Restructuring and other expense	1,703	1,064
Joint venture transactions	3,215
Operating income	21,183	21,072
Other income (expense):
Miscellaneous income (expense)	401	(43)
Interest expense	(4,688)	(4,708)
Equity in net income of unconsolidated affiliates	24,697	18,289
Earnings before income taxes	41,593	34,610
Income tax expense	13,252	10,357
Net earnings	28,341	24,253
Net earnings attributable to noncontrolling interest	2,688	1,899
Net earnings attributable to controlling interest	$ 25,653	$ 22,354
Basic
Average common shares outstanding	71,518	77,658
Earnings per share attributable to controlling interest	$ 0.36	$ 0.29
Diluted
Average common shares outstanding	72,418	77,680
Earnings per share attributable to controlling interest	$ 0.35	$ 0.29
Common shares outstanding at end of period	70,042	74,494
Cash dividends declared per share	$ 0.12	$ 0.10