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Stock Option Activity (Detail) - $ / shares
shares in Thousands
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Beginning Balance 2,699 2,775 2,651
Options, Granted 829 828 732
Options, Exercised (821) (827) (569)
Options, Forfeited (208) (77) (39)
Options Outstanding, Ending Balance 2,499 2,699 2,775
Weighted-Average Exercise Price, Beginning Balance $ 32.88 $ 27.53 $ 23.29
Weighted-Average Exercise Price, Granted 59.37 40.68 35.23
Weighted-Average Exercise Price, Exercised 28.18 22.82 17.60
Weighted-Average Exercise Price, Forfeited 39.57 32.04 28.93
Weighted-Average Exercise Price, Ending Balance 42.63 32.88 27.53
Weighted-Average Grant Date Fair Value, Beginning Balance 9.51 7.97 6.90
Weighted-Average Grant Date Fair Value, Granted 14.47 11.89 9.83
Weighted-Average Grant Date Fair Value, Exercised 8.20 6.77 5.36
Weighted-Average Grant Date Fair Value, Forfeited 11.12 9.17 8.36
Weighted-Average Grant Date Fair Value, Ending Balance $ 11.44 $ 9.51 $ 7.97