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Share-Based Compensation Plans (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 31, 2021
USD ($)
$ / shares
shares
Aug. 31, 2021
USD ($)
Share-based compensation plans    
Expected recognition period for unrecognized share-based compensation   2 years 4 months 24 days
Target achievement for Performance Condition Awards, as a percentage 200.00% 200.00%
Restricted Stock    
Share-based compensation plans    
Number of awards granted (in shares) 143,340  
Unrecognized share-based compensation | $ $ 43.0 $ 43.0
Service Condition Awards    
Share-based compensation plans    
Number of awards granted (in shares) 83,227  
Grant date fair value of shares granted in period (in dollars per share) | $ / shares $ 219.02  
Market Condition Awards    
Share-based compensation plans    
Number of awards granted (in shares) 71,670  
Grant date fair value of shares granted in period (in dollars per share) | $ / shares $ 156.08  
Performance Condition Awards    
Share-based compensation plans    
Number of awards granted (in shares) 71,670  
Grant date fair value of shares granted in period (in dollars per share) | $ / shares $ 216.20