Consolidated Statements of Earnings (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Income Statement [Abstract]
Net sales	$ 1,232,861	$ 731,092	$ 2,343,679	$ 1,434,001
Cost of goods sold	1,048,270	595,618	1,939,714	1,185,169
Gross margin	184,591	135,474	403,965	248,832
Selling, general and administrative expense	96,130	82,129	191,981	164,325
Impairment of long-lived assets	0	3,815	0	13,739
Restructuring and other (income) expense, net	(2,004)	7,596	(14,278)	9,444
Incremental expenses related to Nikola gains	0	4,570	0	54,081
Operating income	90,465	37,364	226,262	7,243
Other income (expense):
Miscellaneous income, net	1,040	376	1,670	827
Interest expense	(7,312)	(7,548)	(15,030)	(15,138)
Equity in net income of unconsolidated affiliates	60,218	25,631	113,134	49,265
Gains (loss) on investment in Nikola	0	(143,780)	0	652,362
Earnings (loss) before income taxes	144,411	(87,957)	326,036	694,559
Income tax expense (benefit)	31,226	(19,445)	71,376	144,333
Net earnings (loss)	113,185	(68,512)	254,660	550,226
Net earnings attributable to noncontrolling interests	2,884	5,532	11,868	7,595
Net earnings (loss) attributable to controlling interest	$ 110,301	$ (74,044)	$ 242,792	$ 542,631
Basic
Weighted average common shares outstanding	50,381	52,988	50,618	53,532
Earnings (loss) per share attributable to controlling interest	$ 2.19	$ (1.40)	$ 4.80	$ 10.14
Diluted
Weighted average common shares outstanding	51,214	52,988	51,532	54,439
Earnings (loss) per share attributable to controlling interest	$ 2.15	$ (1.40)	$ 4.71	$ 9.97
Common shares outstanding at end of period	50,334	52,754	50,334	52,754
Cash dividends declared per share	$ 0.28	$ 0.25	$ 0.56	$ 0.50