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Awards and Restricted Stock Units Issued under 2007 Plan and 2014 Omnibus Plan (Detail) - 2007 Plan and 2014 Omnibus Plan - $ / shares
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Weighted-Average Grant-Date Fair Value      
Beginning Balance $ 25.04    
Shares granted 55.19 $ 50.99 $ 46.63
Shares forfeited 24.79    
Shares exercised 26.22    
Ending Balance $ 26.42 $ 25.04  
Shares      
Beginning Balance 802,000    
Shares granted 36,984    
Shares forfeited (11,000)    
Shares exercised (126,000)    
Ending Balance 702,000 802,000