Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans (Restricted Stock Awards Activity) (Details)

v3.23.2
Stock-Based Compensation Plans (Restricted Stock Awards Activity) (Details) - $ / shares
12 Months Ended
May 31, 2023
May 31, 2022
May 31, 2021
Time-Based Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, Beginning balance 100,000    
Awards granted 0    
Vested (0.0)    
Nonvested, Ending balance 100,000 100,000  
Nonvested, Beginning balance, Weighted-average grant-date fair value per share $ 93.15    
Granted, Weighted-average grant-date fair value per share 0 $ 114.21 $ 73.93
Vested, Weighted-average grant-date fair value per share 91.18    
Nonvested, Ending balance, Weighted-average grant-date fair value per share $ 95.10 $ 93.15  
Performance-Based Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, Beginning balance 100,000    
Awards granted 0    
Vested (0.0)    
Nonvested, Ending balance 100,000 100,000  
Nonvested, Beginning balance, Weighted-average grant-date fair value per share $ 92.45    
Granted, Weighted-average grant-date fair value per share 0 $ 103.97 $ 65.17
Vested, Weighted-average grant-date fair value per share 80.59    
Nonvested, Ending balance, Weighted-average grant-date fair value per share $ 107.40 $ 92.45