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Stock Option Activity (Detail) - $ / shares
shares in Thousands
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Shares Outstanding, Beginning Balance 1,869 2,092 2,314
Shares, Granted 536 512 459
Shares, Exercised (380) (643) (657)
Shares, Forfeited (37) (92) (24)
Shares Outstanding, Ending Balance 1,988 1,869 2,092
Weighted-Average Exercise Price, Beginning Balance $ 25.69 $ 19.21 $ 14.89
Weighted-Average Exercise Price, Granted 39.79 36.44 28.67
Weighted-Average Exercise Price, Exercised 16.69 13.69 10.61
Weighted-Average Exercise Price, Forfeited 33.55 22.08 19.67
Weighted-Average Exercise Price, Ending Balance 31.04 25.69 19.21
Weighted-Average Grant Date Fair Value, Beginning Balance 7.62 6.00 4.63
Weighted-Average Grant Date Fair Value, Granted 11.91 9.87 9.21
Weighted-Average Grant Date Fair Value, Exercised 5.17 4.28 3.43
Weighted-Average Grant Date Fair Value, Forfeited 9.45 6.65 6.07
Weighted-Average Grant Date Fair Value, Ending Balance $ 9.20 $ 7.62 $ 6.00