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Summary of Share-Based Performance-Earned Restricted Stock Activity (Detail) - Performance Based Restricted Stock Awards - $ / shares
shares in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Weighted-Average Grant-Date Fair Value      
Beginning balance $ 35.40    
Shares granted 45.79 $ 44.28 $ 35.11
Shares forfeited 38.75    
Shares vested 26.99    
Ending balance $ 41.78 $ 35.40  
Shares      
Beginning balance 1,441    
Shares granted 476    
Shares forfeited (21)    
Shares vested (489)    
Ending balance 1,407 1,441