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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, 2020
May 31, 2019
May 31, 2018
Weighted-Average Grant-Date Fair Value      
Beginning balance $ 54.90    
Shares granted 63.52 $ 60.36 $ 52.26
Shares forfeited 55.80    
Shares vested 51.11    
Ending balance $ 60.51 $ 54.90  
Shares      
Beginning balance 829    
Shares granted 405    
Shares forfeited (8)    
Shares vested (361)    
Ending balance 865 829