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Summary of Share-Based Performance-Earned Restricted Stock and Performance Stock Units Activity (Detail) - Performance Earned Restricted Stock Awards and Performance Stock Units - $ / shares
shares in Thousands
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Weighted-Average Grant-Date Fair Value      
Beginning balance $ 48.97    
Shares granted 60.36 $ 52.26 $ 50.84
Shares forfeited 57.99    
Shares vested 48.65    
Ending balance $ 54.90 $ 48.97  
Shares      
Beginning balance 1,047    
Shares granted 440    
Shares forfeited (34)    
Shares vested (624)    
Ending balance 829 1,047