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Investments - Additional Information (Detail) - Serviacero Worthington
3 Months Ended
Aug. 31, 2026
USD ($)
Jointventure
Aug. 31, 2025
USD ($)
Investments in and Advances to Affiliates, Activity [Line Items]    
Percent of ownership own a noncontrolling interest held in unconsolidated joint venture 50.00%  
Number of unconsolidated joint ventures | Jointventure 1  
Distributions from unconsolidated affiliates $ 22,000,000 $ 0
Equity method investment, gross distribution $ 44,000,000