Investments in Unconsolidated Affiliates - Schedule of Combined Financial Information for Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019	May 31, 2020
Investments in and Advances to Affiliates [Line Items]
Cash	$ 49,957		$ 49,957		$ 68,730
Other current assets	564,359		564,359		528,631
Total assets	3,027,385		3,027,385		2,331,515
Current liabilities	557,174		557,174		388,238
Short-term borrowings					500
Current maturities of long-term debt	10,700		10,700		37,542
Long-term debt	314,730		314,730		346,690
Other noncurrent liabilities	87,087		87,087		73,656
Shareholders' equity - controlling interest	1,276,899		1,276,899		820,821
Total liabilities and equity	3,027,385		3,027,385		2,331,515
Net sales	731,092	$ 827,637	1,434,001	$ 1,683,496
Gross margin	135,474	120,611	248,832	237,902
Operating income	64,890	62,414	122,843	128,637
Depreciation and amortization	8,672	7,538	16,402	14,627
Interest expense	2,832	3,139	5,777	6,506
Income tax expense	2,322	1,272	4,052	1,853
Net earnings from discontinued operations		46,958		49,770
Net earnings (loss)	(68,512)	56,922	550,226	54,467
Equity Method Investment, Nonconsolidated Investee, Other [Member]
Investments in and Advances to Affiliates [Line Items]
Noncurrent assets	391,547		391,547		399,731
Total assets	1,005,863		1,005,863		997,092
Current liabilities	205,530		205,530		174,709
Shareholders' equity - controlling interest	387,816		387,816		363,995
Total liabilities and equity	1,005,863		1,005,863		$ 997,092
Net sales	451,198	453,288	856,518	923,493
Gross margin	96,561	95,995	189,610	193,531
Net earnings from continuing operations	60,943	53,483	117,516	114,624
Net earnings (loss)	$ 60,943	$ 100,441	$ 117,516	$ 164,394