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Share-Based Compensation Plans - Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 22, 2018 shares | Feb. 29, 2024 USD ($) plan $ / shares shares | Feb. 28, 2023 USD ($) $ / shares shares | Feb. 28, 2022 USD ($) $ / shares 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 |  | 1 |  |  |  |  |  |  |
Number of active share-based compensation plans | plan |  | 2 |  |  |  |  |  |  |
New grants of options (in shares) |  | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Exercises (in shares) | $ |  | $ 0.3 | $ 1.1 | $ 3.6 |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 17.1 |  |  |  |  |  |  |
Weighted average period of recognition (in years) |  | 2 years |  |  |  |  |  |  |
Target achievement as a percentage |  | 0.00% |  |  |  |  |  |  |
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) |  | 697,829 |  |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |  |  |  |
Shares purchased for 2018 ESPP (in shares) |  | 41,749 |  |  |  |  |  |  |
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) |  | 7,256 |  |  |  |  |  |  |
Aggregate grant date fair value of shares issued (in dollars per share) | $ |  | $ 0.8 | $ 0.8 | $ 0.6 |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares |  | $ 108.40 |  |  |  |  |  |  |
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 |  | $ 109.97 | $ 195.90 | $ 218.35 |  |  |  |  |
Fair value of awards vested | $ |  | $ 6.2 | $ 10.2 | $ 14.3 |  |  |  |  |
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 | $ |  | $ 7.5 | $ 37.8 | $ 29.9 |  |  |  |  |
Market Condition Awards |  |  |  |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares |  | $ 80.49 | $ 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% |  |  |  |  |  |  |

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Data Type: | na
Balance Type: |
Period Type: |