v3.26.1
Goodwill, Long-Lived Assets, and Other Assets - Summary of Changes in Carrying Amount of Goodwill (Parenthetical) (Detail) - USD ($)
12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Goodwill [Line Items]      
Impairment of goodwill $ 53,800,000 [1] $ 0 $ 0
Electrical Steel      
Goodwill [Line Items]      
Impairment of goodwill $ 53,800,000    
[1] A pre-tax goodwill impairment charge of $53.8 million that fully impaired the goodwill assigned to the Electrical Steel reporting unit.