v3.25.2
Investments in Unconsolidated Affiliates - Financial Results of Unconsolidated Affiliates (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Investments In And Advances To Affiliates [Line Items]      
Net sales $ 1,153,762 $ 1,245,703 $ 1,418,496
Gross profit 319,035 285,019 323,588
Net earnings (loss) 94,970 117,821 269,170
WAVE | Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 496,355 479,153 447,369
Gross profit 300,881 286,228 242,257
Operating income (loss) 238,139 225,202 184,882
Depreciation and amortization 5,436 4,926 4,679
Interest expense (income), net 16,821 17,288 13,024
Income tax expense 341 267 222
Net earnings (loss) 221,487 205,976 171,687
ClarkDietrich | Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 1,167,689 1,308,517 1,451,665
Gross profit 243,556 326,616 403,569
Operating income (loss) 157,375 236,575 318,914
Depreciation and amortization 16,002 15,075 13,717
Interest expense (income), net (93) 171 524
Income tax expense 1,265 2,250 1,924
Net earnings (loss) 163,182 239,309 321,977
Other | Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 329,651 317,185 417,037
Gross profit 24,745 36,648 26,217
Operating income (loss) (6,249) 26,881 12,418
Depreciation and amortization 9,902 8,974 11,830
Interest expense (income), net 1,041 2,417 2,641
Income tax expense 132 744 1,861
Net earnings (loss) $ (5,539) $ 22,952 $ 7,390