Investments in Unconsolidated Affiliates - Schedule of Condensed Financial Information for Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Feb. 28, 2025	Nov. 30, 2024	Aug. 31, 2024	Feb. 29, 2024	Nov. 30, 2023	Aug. 31, 2023	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2024
Investments in and Advances to Affiliates [Line Items]
Net sales	$ 304,524			$ 316,755			$ 835,878	$ 926,902	$ 926,902
Net earnings (loss)	39,339	$ 28,009	$ 24,008	22,000	$ 28,167	$ 99,703	91,356	149,869
Equity Method Investment, Nonconsolidated Investee, Other | WAVE
Investments in and Advances to Affiliates [Line Items]
Net sales	118,357			117,248			358,889	353,034
Operating income (loss)	54,681			55,998			168,111	164,140
Depreciation and amortization	1,436			853			3,797	3,456
Interest expense (income), net	4,032			4,228			12,676	12,953
Income tax expense (benefit)	70			52			267	179
Net earnings (loss)	50,531			51,706			155,736	151,202
Equity Method Investment, Nonconsolidated Investee, Other | ClarkDietrich
Investments in and Advances to Affiliates [Line Items]
Net sales	271,184			316,269			863,486	985,302
Operating income (loss)	36,942			70,167			108,521	190,949
Depreciation and amortization	3,997			3,978			11,804	11,266
Interest expense (income), net	6			151			(100)	168
Income tax expense (benefit)	312			489			898	977
Net earnings (loss)	37,944			71,164			111,840	193,069
Equity Method Investment, Nonconsolidated Investee, Other | Other
Investments in and Advances to Affiliates [Line Items]
Net sales	70,258			64,421			246,087	241,656
Operating income (loss)	(8,129)			212			(7,945)	21,693
Depreciation and amortization	1,972			2,105			7,535	7,015
Interest expense (income), net	243			564			992	2,099
Income tax expense (benefit)	(24)			8			147	744
Net earnings (loss)	$ (8,432)			$ (2,888)			$ (7,665)	$ 16,477