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Stock Option Activity (Detail) - $ / shares
shares in Thousands
 12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Beginning Balance 2,081 1,988 1,869
Options, Granted 621 549 536
Options, Exercised (620) (427) (380)
Options, Forfeited (58) (29) (37)
Options Outstanding, Ending Balance 2,024 2,081 1,988
Weighted-Average Exercise Price, Beginning Balance $ 36.71 $ 31.04 $ 25.69
Weighted-Average Exercise Price, Granted 54.24 46.98 39.79
Weighted-Average Exercise Price, Exercised 30.42 23.47 16.69
Weighted-Average Exercise Price, Forfeited 42.72 38.57 33.55
Weighted-Average Exercise Price, Ending Balance 43.84 36.71 31.04
Weighted-Average Grant Date Fair Value, Beginning Balance 10.63 9.20 7.62
Weighted-Average Grant Date Fair Value, Granted 15.86 13.11 11.91
Weighted-Average Grant Date Fair Value, Exercised 9.03 7.15 5.17
Weighted-Average Grant Date Fair Value, Forfeited 12.22 11.14 9.45
Weighted-Average Grant Date Fair Value, Ending Balance $ 12.68 $ 10.63 $ 9.20