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Stock-Based Compensation Plans - Additional information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2024 | Jul. 31, 2023 | Jan. 31, 2024
Stock-Based Compensation Plans |  |  |  |  |
Amount before allocation of valuation allowances of deferred tax asset | $ 1.0 |  | $ 1.0 |  | $ 1.0
Number of stock options outstanding (in shares) | 1,622,821 |  | 1,622,821 |  | 1,568,551
Granted, shares (in shares) | 357 | 2,553 | 276,361 | 278,845 |
Weighted average grant-date fair value of options (in dollars per share) |  |  | $ 29.83 | $ 26.29 |
Intrinsic value of options | $ 5.3 | $ 0.8 | $ 12.5 | $ 9.6 |
Stock options |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Total unrecognized compensation cost | 13.8 |  | $ 13.8 |  |
Weighted average period (year) |  |  | 2 years 7 months 6 days |  |
Grant-date fair value of options (in dollars per share) | 0.2 |  | $ 0.3 |  |
PSU |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Total unrecognized compensation cost | 15.7 |  | $ 15.7 |  |
Weighted average period (year) |  |  | 2 years |  |
Fair value other than options (in dollars per share) | 0.0 |  | $ 6.1 |  |
RSU |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Total unrecognized compensation cost | 8.0 |  | $ 8.0 |  |
Weighted average period (year) |  |  | 2 years |  |
Grant-date fair value of options (in dollars per share) | $ 0.0 |  | $ 0.0 |  |
Shareholder-approved stock options plan |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Number of stock options outstanding (in shares) | 1,622,821 |  | 1,622,821 |  |
Number of shares available for grant (in shares) | 2,173,280 |  | 2,173,280 |  |
Deferred share unit plan |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Deferred share units outstanding number (in shares) | 330,441 |  | 330,441 |  | 311,081
Deferred compensation share-based arrangements, liability, current and noncurrent | $ 32.7 |  | $ 32.7 |  | $ 27.3
Deferred share units grants in period (in shares) |  |  | 19,360 |  |
Deferred share units compensation expense | 3.9 | (0.1) | $ 6.3 | 2.3 |
Cash-settled restricted share unit |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Total unrecognized compensation cost | 1.5 |  | 1.5 |  | 0.8
Deferred compensation share-based arrangements, liability, current and noncurrent | 0.2 |  | 0.2 |  | $ 0.2
Cash settled restricted share units compensation expense | $ 0.2 | $ 0.1 | $ 0.4 | $ 0.3 |

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