Investments in Unconsolidated Affiliates - Schedule of Combined Financial Information for Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	May 31, 2021
Investments in and Advances to Affiliates [Line Items]
Total assets	$ 3,547,755		$ 3,373,245
Current liabilities	864,257		787,901
Current maturities of long-term debt	291		458
Long-term debt	706,130		710,031
Other noncurrent liabilities	78,008		82,824
Equity	1,453,343		1,398,193
Total liabilities and equity	3,547,755		3,373,245
Net sales	1,110,818	$ 702,909
Gross margin	219,374	113,358
Operating income	135,797	(30,121)
Depreciation and amortization	22,064	22,211
Interest expense	7,718	7,590
Income tax expense	40,150	163,778
Net earnings	141,475	618,738
Equity Method Investment, Nonconsolidated Investee, Other
Investments in and Advances to Affiliates [Line Items]
Cash	19,289		11,651
Other current assets	977,260		733,834
Noncurrent assets	381,177		382,585
Total assets	1,377,726		1,128,070
Current liabilities	333,144		232,626
Short-term borrowings	7,007		1,155
Current maturities of long-term debt	68,485		30,209
Long-term debt	304,512		311,871
Other noncurrent liabilities	104,933		92,209
Equity	559,645		460,000
Total liabilities and equity	1,377,726		$ 1,128,070
Net sales	744,995	405,320
Gross margin	189,674	93,049
Operating income	145,988	57,953
Depreciation and amortization	3,215	7,730
Interest expense	2,461	2,945
Income tax expense	7,896	1,730
Net earnings	$ 138,888	$ 56,573