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Summary of Stock Options Outstanding (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
May 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding, Number 1,869 2,092 2,314 2,361
Options Outstanding, Average Remaining Contractual Life 3 years 4 months 24 days      
Options Outstanding, Weighted-Average Exercise Price $ 25.69 $ 19.21 $ 14.89 $ 11.85
Options Exercisable, Number 577 749 863 764
Options Exercisable, Weighted Average Exercise Price $ 18.91 $ 14.21    
$5.45 - $16.12
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 5.45      
Range of Exercise price, maximum $ 16.12      
Options Outstanding, Number 286      
Options Outstanding, Average Remaining Contractual Life 1 year 9 months 18 days      
Options Outstanding, Weighted-Average Exercise Price $ 11.70      
Options Exercisable, Number 201      
Options Exercisable, Weighted Average Exercise Price $ 11.14      
$16.13 - $22.91
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 16.13      
Range of Exercise price, maximum $ 22.91      
Options Outstanding, Number 288      
Options Outstanding, Average Remaining Contractual Life 2 years 6 months      
Options Outstanding, Weighted-Average Exercise Price $ 19.32      
Options Exercisable, Number 152      
Options Exercisable, Weighted Average Exercise Price $ 19.57      
$22.92 - $28.26
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 22.92      
Range of Exercise price, maximum $ 28.26      
Options Outstanding, Number 353      
Options Outstanding, Average Remaining Contractual Life 2 years 9 months 18 days      
Options Outstanding, Weighted-Average Exercise Price $ 23.17      
Options Exercisable, Number 134      
Options Exercisable, Weighted Average Exercise Price $ 23.28      
$28.27 - $32.37
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 28.27      
Range of Exercise price, maximum $ 32.37      
Options Outstanding, Number 439      
Options Outstanding, Average Remaining Contractual Life 4 years      
Options Outstanding, Weighted-Average Exercise Price $ 28.67      
Options Exercisable, Number 90      
Options Exercisable, Weighted Average Exercise Price $ 28.67      
$32.38 - $41.65
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum $ 32.38      
Range of Exercise price, maximum $ 41.65      
Options Outstanding, Number 503      
Options Outstanding, Average Remaining Contractual Life 4 years 10 months 24 days      
Options Outstanding, Weighted-Average Exercise Price $ 36.44