v3.26.3
Revenue Recognition - Revenue by Product Class and Timing (Detail) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2026
Aug. 31, 2025
Disaggregation Of Revenue [Line Items]    
Net sales $ 2,726.6 $ 872.9
Direct | Steel Processing    
Disaggregation Of Revenue [Line Items]    
Net sales 2,684.5 839.5
Toll | Steel Processing    
Disaggregation Of Revenue [Line Items]    
Net sales $ 42.1 $ 33.4