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Share-Based Compensation Plans - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 22, 2018
shares
Feb. 28, 2023
USD ($)
plan
$ / shares
shares
Feb. 28, 2022
USD ($)
$ / shares
shares
Feb. 28, 2021
USD ($)
$ / shares
shares
Feb. 29, 2020
shares
Share-based compensation plans          
Number of expired share based compensation plans | plan   1      
Number of active share-based compensation plans | plan   2      
New grants of options (in shares)   0 0 0 0
Exercises (in shares) | $   $ 1.1 $ 3.6 $ 2.8  
Unrecognized compensation expense | $   $ 20.0      
Weighted average period of recognition (in years)   1 year 8 months 12 days      
Target achievement assumption for unrecognized share-based compensation   0.00% 0.00%    
Target achievement as a percentage       150.00%  
The 2018 Plan          
Share-based compensation plans          
Number of shares of common stock covered for issuance under share-based compensation plan (in shares) 2,000,000        
Shares available for issuance (in shares)   1,069,548      
Employee Stock          
Share-based compensation plans          
Shares purchased for 2018 ESPP (in shares)   32,613      
Maximum withholding percentage of employee wages or salaries for the purchase of shares of common stock 15.00%        
Purchase price for shares acquired under the plan as a percentage of the share's fair market value 85.00%        
Restricted Stock | Directors | The 2018 Plan          
Share-based compensation plans          
Shares issued under plan (in shares)   5,584      
Aggregate grant date fair value of shares issued (in dollars per share) | $   $ 0.8 $ 0.6 $ 0.7  
Grant date fair value (in dollars per share) | $ / shares   $ 141.04      
Restricted Stock Awards and Restricted Stock Units          
Share-based compensation plans          
Award vesting period   4 years      
Restricted Stock Awards and Restricted Stock Units | Specified Grading Vesting Terms          
Share-based compensation plans          
Award vesting period   3 years      
Restricted Stock Awards and Restricted Stock Units | The 2018 Plan          
Share-based compensation plans          
Grant date fair value (in dollars per share) | $ / shares   $ 195.90 $ 218.35 $ 179.30  
Fair value of awards vested | $   $ 10.2 $ 14.3 $ 14.0  
Performance Stock Awards          
Share-based compensation plans          
Performance period for PSU awards   3 years      
Target percentage for performance stock awards   100.00%      
Performance Stock Awards | Cliff Vest          
Share-based compensation plans          
Award vesting period   3 years      
Performance Stock Awards | The 2018 Plan          
Share-based compensation plans          
Fair value of awards vested | $   $ 37.8 $ 29.9 $ 18.6  
Market Condition Awards          
Share-based compensation plans          
Grant date fair value (in dollars per share) | $ / shares   $ 152.91 $ 156.08    
Performance period for PSU awards   3 years      
Target achievement as a percentage   100.00%      
Market Condition Awards | Cliff Vest          
Share-based compensation plans          
Award vesting period   3 years      
Minimum | Performance Stock Awards          
Share-based compensation plans          
Target percentage for performance stock awards   0.00%      
Minimum | Market Condition Awards          
Share-based compensation plans          
Target achievement as a percentage   0.00%      
Maximum | Employee Stock          
Share-based compensation plans          
Shares purchased for 2018 ESPP (in shares) 750,000        
Maximum | Performance Stock Awards          
Share-based compensation plans          
Target percentage for performance stock awards   200.00%      
Maximum | Market Condition Awards          
Share-based compensation plans          
Target achievement as a percentage   200.00%