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Stock Option Activity (Detail) - $ / shares
 12 Months Ended
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, Beginning Balance 2,957,000 4,324,000 4,770,000
Options, Granted 615,000 403,000 1,124,000
Options, Exercised (281,000) (1,389,000) (1,438,000)
Options, Forfeited (47,000) (381,000) (132,000)
Options Outstanding, Ending Balance 3,244,000 2,957,000 4,324,000
Weighted-Average Exercise Price, Beginning Balance $ 30.38 $ 27.98 $ 24.69
Weighted-Average Exercise Price, Granted 36.42 34.23 31.96
Weighted-Average Exercise Price, Exercised 22.79 24.38 20.12
Weighted-Average Exercise Price, Forfeited 33.93 28.99 28.72
Weighted-Average Exercise Price, Ending Balance 32.13 30.38 27.98
Weighted-Average Grant Date Fair Value, Beginning Balance 7.36 6.98 6.35
Weighted-Average Grant Date Fair Value, Granted 8.49 7.71 7.78
Weighted-Average Grant Date Fair Value, Exercised 6.29 6.31 5.53
Weighted-Average Grant Date Fair Value, Forfeited 8.02 7.2 7.1
Weighted-Average Grant Date Fair Value, Ending Balance $ 7.66 $ 7.36 $ 6.98