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Investments in Unconsolidated Affiliates - Schedule of Condensed Financial Information for Unconsolidated Affiliates (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Investments in and Advances to Affiliates [Line Items]    
Net sales $ 303,707 $ 257,308
Net earnings (loss) 34,821 24,008
Equity Method Investment, Nonconsolidated Investee, Other | WAVE    
Investments in and Advances to Affiliates [Line Items]    
Net sales 134,717 125,905
Operating income (loss) 67,683 60,065
Depreciation and amortization 1,638 1,470
Interest expense (income), net 3,960 4,409
Income tax expense 134 64
Net earnings (loss) 63,597 56,209
Equity Method Investment, Nonconsolidated Investee, Other | ClarkDietrich    
Investments in and Advances to Affiliates [Line Items]    
Net sales 289,991 301,855
Operating income (loss) 22,789 34,081
Depreciation and amortization 4,495 3,873
Interest expense (income), net 80 (142)
Income tax expense 13 537
Net earnings (loss) 23,735 34,976
Equity Method Investment, Nonconsolidated Investee, Other | Other    
Investments in and Advances to Affiliates [Line Items]    
Net sales 72,485 87,913
Operating income (loss) (3,257) 200
Depreciation and amortization 2,214 2,663
Interest expense (income), net 295 491
Income tax expense 59 44
Net earnings (loss) $ (3,623) $ (503)