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Summary of Stock Options Outstanding (Detail) - $ / shares
shares in Thousands
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
May. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding, Number 1,988 1,869 2,092 2,314
Options Outstanding, Average Remaining Contractual Life 3 years 6 months      
Options Outstanding, Weighted-Average Exercise Price $ 31.04 $ 25.69 $ 19.21 $ 14.89
Options Exercisable, Number 639 577 749 863
Options Exercisable, Weighted Average Exercise Price $ 24.50 $ 18.91    
$ 5.45 - $ 22.91        
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 $ 22.91      
Options Outstanding, Number 261      
Options Outstanding, Average Remaining Contractual Life 2 years 4 months 24 days      
Options Outstanding, Weighted-Average Exercise Price $ 17.10      
Options Exercisable, Number 198      
Options Exercisable, Weighted Average Exercise Price $ 16.58      
$ 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 321      
Options Outstanding, Average Remaining Contractual Life 1 year 9 months 18 days      
Options Outstanding, Weighted-Average Exercise Price $ 23.17      
Options Exercisable, Number 184      
Options Exercisable, Weighted Average Exercise Price $ 23.22      
$ 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 411      
Options Outstanding, Average Remaining Contractual Life 3 years      
Options Outstanding, Weighted-Average Exercise Price $ 28.67      
Options Exercisable, Number 164      
Options Exercisable, Weighted Average Exercise Price $ 28.67      
$ 32.38 - $ 38.03        
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 $ 38.03      
Options Outstanding, Number 432      
Options Outstanding, Average Remaining Contractual Life 3 years 7 months 6 days      
Options Outstanding, Weighted-Average Exercise Price $ 36.07      
Options Exercisable, Number 81      
Options Exercisable, Weighted Average Exercise Price $ 36.07      
$ 38.04 - $ 43.67        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise price, minimum 38.04      
Range of Exercise price, maximum $ 43.67      
Options Outstanding, Number 563      
Options Outstanding, Average Remaining Contractual Life 5 years 1 month 6 days      
Options Outstanding, Weighted-Average Exercise Price $ 39.90      
Options Exercisable, Number 12      
Options Exercisable, Weighted Average Exercise Price $ 41.60