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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, 2017
May 31, 2016
May 31, 2015
Weighted-Average Grant-Date Fair Value      
Beginning Balance $ 23.27    
Shares granted 50.99 $ 46.63 $ 44.60
Shares exercised 21.06    
Ending Balance $ 25.04 $ 23.27  
Shares      
Beginning Balance 793,000    
Shares granted 48,041    
Shares exercised (39,000)    
Ending Balance 802,000 793,000