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Stock Option Activity (Detail) - $ / shares
 12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Beginning Balance 2,385,000 2,499,000 2,699,000
Options, Granted 562,000 527,000 829,000
Options, Exercised (719,000) (513,000) (821,000)
Options, Forfeited (66,000) (128,000) (208,000)
Options Outstanding, Ending Balance 2,162,000 2,385,000 2,499,000
Weighted-Average Exercise Price, Beginning Balance $ 49.37 $ 42.63 $ 32.88
Weighted-Average Exercise Price, Granted 63.91 62.92 59.37
Weighted-Average Exercise Price, Exercised 40.24 31.28 28.18
Weighted-Average Exercise Price, Forfeited 57.44 47.08 39.57
Weighted-Average Exercise Price, Ending Balance 55.96 49.37 42.63
Weighted-Average Grant Date Fair Value, Beginning Balance 12.70 11.44 9.51
Weighted-Average Grant Date Fair Value, Granted 15.56 14.91 14.47
Weighted-Average Grant Date Fair Value, Exercised 11.05 8.92 8.20
Weighted-Average Grant Date Fair Value, Forfeited 14.20 12.42 11.12
Weighted-Average Grant Date Fair Value, Ending Balance $ 13.95 $ 12.70 $ 11.44