Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Income Statement [Abstract]
Net sales	$ 763,996	$ 874,381	$ 2,447,492	$ 2,820,714
Cost of goods sold	648,451	784,360	2,094,045	2,466,762
Gross margin	115,545	90,021	353,447	353,952
Selling, general and administrative expense	80,928	75,220	260,294	250,529
Impairment of goodwill and long-lived assets	34,627	0	75,228	2,381
Restructuring and other expense (income), net	1,376	(11,176)	1,781	(11,710)
Operating income (loss)	(1,386)	25,977	16,144	112,752
Other income (expense):
Miscellaneous income, net	6,985	525	8,316	2,222
Interest expense	(7,362)	(9,341)	(24,157)	(28,541)
Loss on extinguishment of debt	0	0	(4,034)	0
Equity in net income of unconsolidated affiliates	25,479	20,802	97,592	71,897
Earnings before income taxes	23,716	37,963	93,861	158,330
Income tax expense	4,828	8,415	20,506	34,032
Net earnings	18,888	29,548	73,355	124,298
Net earnings attributable to noncontrolling interests	3,577	2,775	10,734	8,581
Net earnings attributable to controlling interest	$ 15,311	$ 26,773	$ 62,621	$ 115,717
Basic
Average common shares outstanding	54,930	56,478	55,078	57,650
Earnings per share attributable to controlling interest	$ 0.28	$ 0.47	$ 1.14	$ 2.01
Diluted
Average common shares outstanding	55,898	57,974	56,164	59,389
Earnings per share attributable to controlling interest	$ 0.27	$ 0.46	$ 1.11	$ 1.95
Common shares outstanding at end of period	54,598	56,181	54,598	56,181
Cash dividends declared per share	$ 0.24	$ 0.23	$ 0.72	$ 0.69