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Summary of Stock Options Outstanding (Detail) (USD $)
 12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
May 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding, Number 1,394,745 1,543,000 1,574,000 1,998,000
Options Outstanding, Average Remaining Contractual Life 3 years 2 months 23 days      
Options Outstanding, Weighted-Average Exercise Price $ 28.82 $ 22.34 $ 17.77 $ 14.14
Options Exercisable, Number 499,292 575,000 509,000 729,000
Options Exercisable, Weighted Average Exercise Price $ 21.31 $ 16.59    
$6.75 - $19.17
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 6.75      
Range of Exercise price, maximum $ 19.17      
Options Outstanding, Number 225,912      
Options Outstanding, Average Remaining Contractual Life 1 year 11 months 19 days      
Options Outstanding, Weighted-Average Exercise Price $ 15.03      
Options Exercisable, Number 164,192      
Options Exercisable, Weighted Average Exercise Price $ 13.85      
$19.18 - $19.94
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 19.18      
Range of Exercise price, maximum $ 19.94      
Options Outstanding, Number 287,066      
Options Outstanding, Average Remaining Contractual Life 1 year 7 months 13 days      
Options Outstanding, Weighted-Average Exercise Price $ 19.55      
Options Exercisable, Number 155,071      
Options Exercisable, Weighted Average Exercise Price $ 19.55      
$19.95 - $34.37
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 19.95      
Range of Exercise price, maximum $ 34.37      
Options Outstanding, Number 295,017      
Options Outstanding, Average Remaining Contractual Life 3 years 5 months 9 days      
Options Outstanding, Weighted-Average Exercise Price $ 28.10      
Options Exercisable, Number 124,981      
Options Exercisable, Weighted Average Exercise Price $ 27.25      
$34.38 - $42.39
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 34.38      
Range of Exercise price, maximum $ 42.39      
Options Outstanding, Number 283,250      
Options Outstanding, Average Remaining Contractual Life 3 years 9 months      
Options Outstanding, Weighted-Average Exercise Price $ 34.76      
Options Exercisable, Number 55,048      
Options Exercisable, Weighted Average Exercise Price $ 35.01      
$42.40 - $43.00
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 42.40      
Range of Exercise price, maximum $ 43.00      
Options Outstanding, Number 303,500      
Options Outstanding, Average Remaining Contractual Life 4 years 11 months 27 days      
Options Outstanding, Weighted-Average Exercise Price $ 43.00      
Options Exercisable, Number 0      
Options Exercisable, Weighted Average Exercise Price $ 0.00