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Stock-based Compensation Plans - Additional information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | $ 0.7 | $ 0.7 |
Share-based Payment Arrangement, Exercise of Option, Tax Benefit | $ 0.1 |  | $ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 1,319,279 | 1,147,720 | 1,127,822
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 271,025 | 381,859 | 367,173
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 16.77 | $ 10.19 | $ 8.99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 3.7 | $ 10.8 | $ 2.0
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 6.1 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 2 years 7 months 6 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 3.4 |  |
Performance Shares [Member] |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 6.7 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 1 month 6 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 3.6 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 3.2 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 7 months 6 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 2.6 |  |
Shareholder-Approved Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 1,319,279 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 271,025 | 381,859 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 16.77 | $ 10.19 |
Shareholder-Approved Stock Option Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 3,041,719 |  |
Deferred Share Unit Plan [Member] |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 0.0 | $ 0.0 |
Deferred Share Units Outstanding Number (in shares) | 252,011 | 226,525 |
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent | $ 18.3 | $ 13.8 |
Deferred Share Units Grants In Period (in shares) | 25,486 |  |
Deferred Share Units Redeemed and Settled in Cash (in shares) | 0 |  |
Deferred Share Units Compensation Expense | $ 4.5 | 4.6 | 5.0
Cash-Settled Restricted Share Unit [Member] |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | 1.0 | 1.5 |
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent | 0.8 | 0.9 |
Cash Settled Restricted Share Units Compensation Expense | $ 1.3 | $ 1.1 | $ 0.9

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