Investments in Unconsolidated Affiliates - Financial Results of Four Largest Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Investments In And Advances To Affiliates [Line Items]
Net sales	$ 1,245,703	$ 1,418,496	$ 1,309,189
Gross profit	285,019	323,588	327,608
Net earnings (loss)	117,821	269,170	399,264
Equity Method Investment, Nonconsolidated Investee, Other
Investments In And Advances To Affiliates [Line Items]
Net sales	2,104,855	2,316,071	2,648,530
Gross profit	649,492	672,043	711,681
Operating income (loss)	488,658	516,214	548,882
Depreciation and amortization	28,975	30,226	27,794
Interest expense	19,876	16,189	10,262
Income tax expense	3,261	4,007	1,660
Net earnings (loss)	468,237	501,054	545,452
WAVE | Equity Method Investment, Nonconsolidated Investee, Other
Investments In And Advances To Affiliates [Line Items]
Net sales	479,153	447,369	452,368
Gross profit	286,228	242,257	238,523
Operating income (loss)	225,202	184,882	183,545
Depreciation and amortization	4,926	4,679	4,554
Interest expense	17,288	13,024	8,386
Income tax expense	267	222	158
Net earnings (loss)	205,976	171,687	175,154
ClarkDietrich | Equity Method Investment, Nonconsolidated Investee, Other
Investments In And Advances To Affiliates [Line Items]
Net sales	1,308,517	1,451,665	1,695,808
Gross profit	326,616	403,569	431,070
Operating income (loss)	236,575	318,914	351,583
Depreciation and amortization	15,075	13,717	10,946
Interest expense	171	524	308
Income tax expense	2,250	1,924
Net earnings (loss)	239,309	321,977	356,288
Workhorse | Equity Method Investment, Nonconsolidated Investee, Other
Investments In And Advances To Affiliates [Line Items]
Net sales	317,185	364,396	313,265
Gross profit	36,648	17,628	11,455
Operating income (loss)	26,881	7,507	(2,024)
Depreciation and amortization	8,974	10,386	6,586
Interest expense	2,417	2,507	1,228
Income tax expense	744	1,802	1,244
Net earnings (loss)	$ 22,952	2,673	(1,170)
ArtiFlex | Equity Method Investment, Nonconsolidated Investee, Other
Investments In And Advances To Affiliates [Line Items]
Net sales		52,641	187,089
Gross profit		8,589	30,633
Operating income (loss)		4,911	15,778
Depreciation and amortization		1,444	5,708
Interest expense		134	340
Income tax expense		59	258
Net earnings (loss)		$ 4,717	$ 15,180