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Equity - Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 31, 2023
May 31, 2022
May 31, 2021
Selling, general and administrative expenses      
Weighted Average Fair Value on Grant Date      
Excess tax benefit recognized $ 10.0 $ 4.4 $ 5.2
Restricted stock      
Number of Shares      
Nonvested at the beginning of the period ( in shares) 554,000    
Granted (in shares) 197,000    
Vested (in shares) (97,000)    
Forfeited (in shares) (82,000)    
Nonvested at the end of the period (in shares) 572,000 554,000  
Weighted Average Fair Value on Grant Date      
Nonvested at the beginning of the period (in dollars per share) $ 38.95    
Granted (in dollars per share) 42.01    
Vested (in dollars per share) 39.43    
Forfeited (in dollars per share) 36.33    
Nonvested at the end of the period (in dollars per share) $ 43.92 $ 38.95  
Unearned compensation not yet recognized $ 14.3    
Average remaining expensed period of unearned compensation 1 year 9 months 18 days    
Performance based restricted stock | Executives and other key employees      
Number of Shares      
Granted (in shares) 74,660 43,010 0
Time based restricted stock | Board of Directors      
Number of Shares      
Granted (in shares) 28,851 32,307 72,021
Time based restricted stock | Executives and other key employees      
Number of Shares      
Granted (in shares) 93,450 260,742 144,255