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Stock Option Activity (Parenthetical) (Detail) - shares
May 31, 2023
May 31, 2022
May 31, 2021
May 31, 2020
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding, Exercisable Beginning Balance 1,401,000 1,191,000 643,000 972,000