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Stock Option Activity (Detail) (USD $)
 12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Shares Outstanding, Beginning Balance 1,543,000 1,574,000 1,998,000
Shares, Granted 306,000 316,000 293,000
Shares, Exercised (438,000) (320,000) (627,000)
Shares, Forfeited (16,000) (27,000) (90,000)
Shares Outstanding, Ending Balance 1,394,745 1,543,000 1,574,000
Weighted-Average Exercise Price, Beginning Balance $ 22.34 $ 17.77 $ 14.14
Weighted-Average Exercise Price, Granted $ 43.00 $ 34.59 $ 28.50
Weighted-Average Exercise Price, Exercised $ 15.91 $ 12.44 $ 9.83
Weighted-Average Exercise Price, Forfeited $ 29.50 $ 16.62 $ 18.22
Weighted-Average Exercise Price, Ending Balance $ 28.82 $ 22.34 $ 17.77
Weighted-Average Fair Value, Beginning Balance $ 6.95 $ 5.71 $ 4.72
Weighted-Average Fair Value, Granted $ 13.81 $ 10.41 $ 8.66
Weighted-Average Fair Value, Exercised $ 5.14 $ 4.39 $ 3.98
Weighted-Average Fair Value, Forfeited $ 9.11 $ 5.39 $ 5.84
Weighted-Average Fair Value, Ending Balance $ 9.00 $ 6.95 $ 5.71