Investments in Unconsolidated Affiliates - Schedule of Combined Financial Information for Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Nov. 30, 2021	Aug. 31, 2021	Nov. 30, 2020	Aug. 31, 2020	Nov. 30, 2021	Nov. 30, 2020	May 31, 2021
Investments in and Advances to Affiliates [Line Items]
Total assets	$ 3,517,632				$ 3,517,632		$ 3,373,245
Current liabilities	820,158				820,158		787,901
Current maturities of long-term debt	280				280		458
Long-term debt	701,892				701,892		710,031
Other noncurrent liabilities	81,786				81,786		82,824
Equity	1,479,797				1,479,797		1,398,193
Total liabilities and equity	3,517,632				3,517,632		3,373,245
Net sales	1,232,861		$ 731,092		2,343,679	$ 1,434,001
Gross margin	184,591		135,474		403,965	248,832
Operating income	90,465		37,364		226,262	7,243
Depreciation and amortization	21,090		21,560		43,154	43,771
Income tax expense	31,226		(19,445)		71,376	144,333
Net earnings	113,185	$ 141,475	(68,512)	$ 618,738	254,660	550,226
Equity Method Investment, Nonconsolidated Investee, Other
Investments in and Advances to Affiliates [Line Items]
Cash	34,797				34,797		11,651
Other current assets	1,140,126				1,140,126		733,834
Noncurrent assets	365,845				365,845		382,585
Total assets	1,540,768				1,540,768		1,128,070
Current liabilities	403,512				403,512		232,626
Short-term borrowings	2,879				2,879		1,155
Current maturities of long-term debt	58,753				58,753		30,209
Long-term debt	298,945				298,945		311,871
Other noncurrent liabilities	104,418				104,418		92,209
Equity	672,261				672,261		460,000
Total liabilities and equity	1,540,768				1,540,768		$ 1,128,070
Net sales	858,165		451,198		1,603,160	856,518
Gross margin	226,502		96,561		416,176	189,610
Operating income	184,779		64,890		330,767	122,843
Depreciation and amortization	7,848		8,672		16,075	16,402
Interest expense (income)	(2,711)		2,832		(5,172)	5,777
Income tax expense	8,565		2,322		16,461	4,052
Net earnings	$ 173,915		$ 60,943		$ 312,803	$ 117,516