v3.26.1
Investments in Unconsolidated Affiliates - Schedule of Condensed Financial Information for Unconsolidated Affiliates (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 28, 2026
Nov. 30, 2025
Aug. 31, 2025
Feb. 28, 2025
Nov. 30, 2024
Aug. 31, 2024
Feb. 28, 2026
Feb. 28, 2025
Investments in and Advances to Affiliates [Line Items]                
Net sales $ 378,677     $ 304,524     $ 1,009,836 $ 835,878
Net earnings (loss) 45,120 $ 27,029 $ 34,821 39,339 $ 28,009 $ 24,008 106,970 91,356
Equity Method Investment, Nonconsolidated Investee, Other | WAVE                
Investments in and Advances to Affiliates [Line Items]                
Net sales 122,245     118,357     377,695 358,889
Operating income (loss) 56,635     54,681     181,785 168,111
Depreciation and amortization 1,512     1,436     3,941 3,797
Interest expense (income), net 3,813     4,032     11,644 12,676
Income tax expense (benefit) 88     70     204 267
Net earnings (loss) 52,847     50,531     170,598 155,736
Equity Method Investment, Nonconsolidated Investee, Other | ClarkDietrich                
Investments in and Advances to Affiliates [Line Items]                
Net sales 274,314     271,184     846,920 863,486
Operating income (loss) 23,758     36,942     62,427 108,521
Depreciation and amortization 5,194     3,997     14,275 11,804
Interest expense (income), net (248)     6     (138) (100)
Income tax expense (benefit) (70)     312     (110) 898
Net earnings (loss) 22,902     37,944     63,169 111,840
Equity Method Investment, Nonconsolidated Investee, Other | Other                
Investments in and Advances to Affiliates [Line Items]                
Net sales 56,037     70,258     201,868 246,087
Operating income (loss) (5,043)     (8,129)     (9,295) (7,945)
Depreciation and amortization 2,209     1,972     6,612 7,535
Interest expense (income), net 188     243     633 992
Income tax expense (benefit) 7     (24)     323 147
Net earnings (loss) $ (5,206)     $ (8,432)     $ (10,955) $ (7,665)