Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Income Statement [Abstract]
Net sales	$ 874,381	$ 841,657	$ 2,820,714	$ 2,561,160
Cost of goods sold	784,360	714,603	2,466,762	2,161,249
Gross margin	90,021	127,054	353,952	399,911
Selling, general and administrative expense	75,220	84,294	250,529	261,968
Impairment of goodwill and long-lived assets			2,381	8,289
Restructuring and other income, net	(11,176)	(3)	(11,710)	(7,393)
Operating income	25,977	42,763	112,752	137,047
Other income (expense):
Miscellaneous income, net	525	1,500	2,222	3,169
Interest expense	(9,341)	(9,775)	(28,541)	(28,620)
Equity in net income of unconsolidated affiliates	20,802	19,770	71,897	63,521
Earnings before income taxes	37,963	54,258	158,330	175,117
Income tax expense (benefit)	8,415	(24,039)	34,032	7,124
Net earnings	29,548	78,297	124,298	167,993
Net earnings (loss) attributable to noncontrolling interests	2,775	(791)	8,581	3,968
Net earnings attributable to controlling interest	$ 26,773	$ 79,088	$ 115,717	$ 164,025
Basic
Average common shares outstanding	56,478	60,383	57,650	61,451
Earnings per share attributable to controlling interest	$ 0.47	$ 1.31	$ 2.01	$ 2.67
Diluted
Average common shares outstanding	57,974	62,345	59,389	63,507
Earnings per share attributable to controlling interest	$ 0.46	$ 1.27	$ 1.95	$ 2.58
Common shares outstanding at end of period	56,181	59,802	56,181	59,802
Cash dividends declared per share	$ 0.23	$ 0.21	$ 0.69	$ 0.63