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Share-Based Compensation Plans - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 22, 2018
shares
Feb. 28, 2021
USD ($)
plan
$ / shares
shares
Feb. 29, 2020
USD ($)
$ / shares
shares
Feb. 28, 2019
USD ($)
$ / shares
shares
Feb. 28, 2018
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
Number of options vested   2,000,000      
Weighted average grant date fair value of vested options | $ / shares   $ 90.51      
Exercises (in shares) | $   $ 2.8 $ 9.1 $ 6.4  
Unrecognized compensation expense | $   $ 20.7      
Weighted average period of recognition (in years)   1 year 10 months 24 days      
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 issued under plan (in shares)   10,083      
Employee Stock          
Share-based compensation plans          
Shares purchased for 2018 ESPP (in shares)   26,830      
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          
Share-based compensation plans          
Shares issued under plan (in shares)   3,619      
Grant date fair value (in dollars per share) | $ / shares   $ 189.18      
Restricted Stock | Directors | The 2018 Plan          
Share-based compensation plans          
Aggregate grant date fair value of shares issued (in dollars per share) | $   $ 0.7 $ 0.6 $ 0.5  
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   $ 179.30 $ 118.76 $ 106.28  
Fair value of awards vested | $   $ 14.0 $ 10.8 $ 3.9  
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 | $   $ 18.6 $ 15.0 $ 9.1  
Minimum | Performance Stock Awards          
Share-based compensation plans          
Target percentage for performance stock awards   0.00%      
Maximum          
Share-based compensation plans          
Target percentage for performance stock awards   200.00%      
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%