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Stock Option Activity (Detail) - $ / shares
 12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Beginning Balance 4,324,000 4,770,000 4,998,000
Options, Granted 403,000 1,124,000 1,054,000
Options, Exercised (1,389,000) (1,438,000) (1,026,000)
Options, Forfeited (381,000) (132,000) (256,000)
Options Outstanding, Ending Balance 2,957,000 4,324,000 4,770,000
Weighted-Average Exercise Price, Beginning Balance $ 27.98 $ 24.69 $ 21.32
Weighted-Average Exercise Price, Granted 34.23 31.96 31.46
Weighted-Average Exercise Price, Exercised 24.38 20.12 15.64
Weighted-Average Exercise Price, Forfeited 28.99 28.72 23.54
Weighted-Average Exercise Price, Ending Balance 30.38 27.98 24.69
Weighted-Average Grant Date Fair Value, Beginning Balance 6.98 6.35 5.72
Weighted-Average Grant Date Fair Value, Granted 7.71 7.78 7.46
Weighted-Average Grant Date Fair Value, Exercised 6.31 5.53 4.46
Weighted-Average Grant Date Fair Value, Forfeited 7.20 7.10 6.21
Weighted-Average Grant Date Fair Value, Ending Balance $ 7.36 $ 6.98 $ 6.35