v3.26.1
Investments - Schedule of Financial Information of Unconsolidated Affiliate (Detail) - USD ($)
$ in Millions
12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Investments In And Advances To Affiliates [Line Items]      
Net sales $ 3,443.8 $ 3,093.3 $ 3,430.6
Gross margin 403.3 388.6 439.8
Net earnings (12.9) 119.3 170.1
Serviacero Worthington      
Investments In And Advances To Affiliates [Line Items]      
Net sales 488.9 507.6 604.1
Gross margin 61.6 48.3 70.4
Operating income 45.0 32.7 56.4
Depreciation and amortization 4.1 4.7 4.4
Interest expense 0.0 0.0 0.0
Income tax expense 4.1 15.0 8.4
Net earnings $ 40.6 $ 8.7 $ 44.8