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Share-Based Compensation Plans - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 22, 2018
shares
Feb. 28, 2026
USD ($)
plan
$ / shares
shares
Feb. 28, 2025
USD ($)
$ / shares
shares
Feb. 29, 2024
USD ($)
$ / shares
shares
Feb. 28, 2023
shares
Feb. 28, 2022
shares
Feb. 28, 2021
shares
Feb. 29, 2020
shares
Feb. 28, 2019
shares
Feb. 28, 2018
shares
Feb. 28, 2017
shares
Share-based compensation plans                      
Number of expired share based compensation plans | plan   2                  
Number of active share-based compensation plans | plan   2                  
New grants of options (in shares)   0 0 0 0 0 0 0 0 0 0
Exercises (in shares) | $   $ 0.0 $ 0.2 $ 0.3              
Target percentage for performance stock awards   0.00% 0.00% 0.00%              
Target achievement as a percentage   83.00% 81.00% 0.00%              
Unrecognized compensation expense | $   $ 15.0                  
Weighted average period of recognition (in years)   1 year 9 months 18 days                  
The 2025 Plan                      
Share-based compensation plans                      
Shares available for issuance (in shares)   1,102,944                  
Employee Stock                      
Share-based compensation plans                      
Shares purchased for 2018 ESPP (in shares)   94,685                  
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 and The 2025 Plan                      
Share-based compensation plans                      
Shares issued under plan (in shares)   29,080                  
Aggregate grant date fair value of shares issued (in dollars per share) | $   $ 0.8 $ 0.8 $ 0.8              
Grant date fair value (in dollars per share) | $ / shares   $ 26.97                  
Restricted Stock Awards and Restricted Stock Units | The 2018 Plan                      
Share-based compensation plans                      
Grant date fair value (in dollars per share) | $ / shares   $ 43.64 $ 99.20 $ 109.97              
Fair value of awards vested | $   $ 5.5 $ 8.8 $ 6.2              
Restricted Stock Awards and Restricted Stock Units | 2008 Stock Incentive Plan                      
Share-based compensation plans                      
Grant date fair value (in dollars per share) | $ / shares   $ 43.64                  
Vested (in shares)   (148,000)                  
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 | $   $ 0.0 $ 0.0 $ 7.5              
Market Condition Awards                      
Share-based compensation plans                      
Grant date fair value (in dollars per share) | $ / shares   $ 26.47 $ 91.19 $ 80.49              
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                  
Market Condition Awards | 2008 Stock Incentive Plan                      
Share-based compensation plans                      
Vested (in shares)   0 0                
Minimum | Restricted Stock Awards and Restricted Stock Units                      
Share-based compensation plans                      
Award vesting period   2 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 | Restricted Stock Awards and Restricted Stock Units                      
Share-based compensation plans                      
Award vesting period   4 years                  
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%