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Stock Option Activity (Detail) - $ / shares
shares in Thousands
 12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Beginning Balance 2,499 2,699 2,775
Options, Granted 527 829 828
Options, Exercised (513) (821) (827)
Options, Forfeited (128) (208) (77)
Options Outstanding, Ending Balance 2,385 2,499 2,699
Weighted-Average Exercise Price, Beginning Balance $ 42.63 $ 32.88 $ 27.53
Weighted-Average Exercise Price, Granted 62.92 59.37 40.68
Weighted-Average Exercise Price, Exercised 31.28 28.18 22.82
Weighted-Average Exercise Price, Forfeited 47.08 39.57 32.04
Weighted-Average Exercise Price, Ending Balance 49.37 42.63 32.88
Weighted-Average Grant Date Fair Value, Beginning Balance 11.44 9.51 7.97
Weighted-Average Grant Date Fair Value, Granted 14.91 14.47 11.89
Weighted-Average Grant Date Fair Value, Exercised 8.92 8.20 6.77
Weighted-Average Grant Date Fair Value, Forfeited 12.42 11.12 9.17
Weighted-Average Grant Date Fair Value, Ending Balance $ 12.70 $ 11.44 $ 9.51