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Share-Based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May 31, 2022
Nov. 30, 2022
Feb. 28, 2021
Share-based compensation plans      
Expected recognition period for unrecognized share-based compensation   1 year 10 months 24 days  
Target achievement for performance condition awards, as a percentage     150.00%
Restricted Stock      
Share-based compensation plans      
Number of awards granted (in shares) 165,734    
Unrecognized share-based compensation   $ 41.3  
Service Condition Awards      
Share-based compensation plans      
Number of awards granted (in shares) 36,088    
Grant date fair value of shares granted in period (in dollars per share) $ 204.11    
Market Condition Awards      
Share-based compensation plans      
Number of awards granted (in shares) 82,867    
Grant date fair value of shares granted in period (in dollars per share) $ 152.91    
Performance Condition Awards      
Share-based compensation plans      
Number of awards granted (in shares) 82,867    
Grant date fair value of shares granted in period (in dollars per share) $ 204.11