Investments in Unconsolidated Affiliates - Schedule of Combined Financial Information for Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	May 31, 2020
Investments in and Advances to Affiliates [Line Items]
Cash	$ 27,796		$ 27,796		$ 68,730
Other current assets	596,911		596,911		528,631
Total assets	3,137,873		3,137,873		2,331,515
Current liabilities	637,261		637,261		388,238
Short-term borrowings					500
Current maturities of long-term debt	12,119		12,119		37,542
Long-term debt	313,908		313,908		346,690
Other noncurrent liabilities	80,757		80,757		73,656
Shareholders' equity - controlling interest	1,311,790		1,311,790		820,821
Total liabilities and equity	3,137,873		3,137,873		2,331,515
Net sales	759,109	$ 763,996	2,193,110	$ 2,447,492
Gross margin	164,098	115,545	412,930	353,447
Operating income	79,090	52,429	201,933	181,067
Depreciation and amortization	11,228	8,482	27,630	23,109
Interest expense	2,774	3,667	8,551	10,173
Income tax expense (benefit)	1,159	(614)	5,211	1,239
Net earnings from discontinued operations				49,770
Net earnings	72,682	18,888	622,908	73,355
Equity Method Investment, Nonconsolidated Investee, Other [Member]
Investments in and Advances to Affiliates [Line Items]
Noncurrent assets	386,434		386,434		399,731
Total assets	1,011,141		1,011,141		997,092
Current liabilities	188,113		188,113		174,709
Shareholders' equity - controlling interest	416,244		416,244		363,995
Total liabilities and equity	1,011,141		1,011,141		$ 997,092
Net sales	470,988	477,494	1,327,506	1,400,987
Gross margin	103,035	100,070	292,645	293,601
Net earnings from continuing operations	76,048	54,806	193,564	169,430
Net earnings	$ 76,048	$ 54,806	$ 193,564	$ 219,200