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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, 2021
May 31, 2020
May 31, 2019
Weighted-Average Grant-Date Fair Value      
Beginning balance $ 60.51    
Shares granted 80.67 $ 63.52 $ 60.36
Shares forfeited 65.24    
Shares vested 53.69    
Ending balance $ 69.13 $ 60.51  
Shares      
Beginning balance 865    
Shares granted 427    
Shares forfeited (18)    
Shares vested (158)    
Ending balance 1,116 865