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v3.23.2

Stock-Based Compensation Plans - Additional information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2023 | Jul. 31, 2022 | Jan. 31, 2023
Stock-Based Compensation Plans |  |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | $ 0.8 |  | $ 0.8 |  | $ 0.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 1,657,444 |  | 1,657,444 |  | 1,593,433
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 2,553 | 92,422 | 278,845 | 354,699 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 26.29 | $ 18.91 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 0.8 | $ 0.2 | $ 9.6 | $ 1.3 |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | 12.2 |  | $ 12.2 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 9 months 18 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | 0.2 |  | $ 0.3 |  |
Performance Shares [Member] |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | 13.8 |  | $ 13.8 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 1 month 6 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | 0.0 |  | $ 4.6 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | 6.8 |  | $ 6.8 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 1 month 6 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 0.0 |  | $ 0.0 |  |
Shareholder-Approved Stock Options Plan [Member] |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 1,657,444 |  | 1,657,444 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 2,438,153 |  | 2,438,153 |  |
Deferred Share Unit Plan [Member] |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Deferred Share Units Outstanding Number (in shares) | 308,427 |  | 308,427 |  | 283,338
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent | $ 23.2 |  | $ 23.2 |  | $ 20.6
Deferred Share Units Grants In Period (in shares) |  |  | 25,089 |  |
Deferred share units compensation expense | (0.1) | 2.7 | $ 2.3 | 0.3 |
Cash-Settled Restricted Share Unit [Member] |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | 1.0 |  | 1.0 |  | 0.7
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent | 0.2 |  | 0.2 |  | $ 0.4
Cash settled restricted share units compensation expense | $ 0.1 | $ 0.2 | $ 0.3 | $ 0.4 |

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