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Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Shares Outstanding, Beginning Balance 2,092 2,314 2,361
Shares, Granted 512 459 474
Shares, Exercised (643) (657) (480)
Shares, Forfeited (92) (24) (41)
Shares Outstanding, Ending Balance 1,869 2,092 2,314
Weighted-Average Exercise Price, Beginning Balance $ 19.21 $ 14.89 $ 11.85
Weighted-Average Exercise Price, Granted $ 36.44 $ 28.67 $ 23.06
Weighted-Average Exercise Price, Exercised $ 13.69 $ 10.61 $ 8.29
Weighted-Average Exercise Price, Forfeited $ 22.08 $ 19.67 $ 11.08
Weighted-Average Exercise Price, Ending Balance $ 25.69 $ 19.21 $ 14.89
Weighted-Average Grant Date Fair Value, Beginning Balance $ 6.00 $ 4.63 $ 3.81
Weighted-Average Grant Date Fair Value, Granted $ 9.87 $ 9.21 $ 6.94
Weighted-Average Grant Date Fair Value, Exercised $ 4.28 $ 3.43 $ 2.93
Weighted-Average Grant Date Fair Value, Forfeited $ 6.65 $ 6.07 $ 3.59
Weighted-Average Grant Date Fair Value, Ending Balance $ 7.62 $ 6.00 $ 4.63