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Stock-Based Compensation Plans - Additional information (Details) - USD ($) | 12 Months Ended
--- | ---
Jan. 31, 2024 | Jan. 31, 2023 | Jan. 31, 2022
Stock-Based Compensation Plans |  |  |
Amount before allocation of valuation allowances of deferred tax asset | $ 1,000,000.0 | $ 800,000 |
Tax benefit realized in connection with stock options exercised | $ 400,000 | $ 100,000 | $ 100,000
Number of stock options outstanding (in shares) | 1,568,551 | 1,593,433 | 1,319,279
Granted, shares (in shares) | 278,845 | 356,014 | 271,025
Weighted average grant-date fair value of options (in dollars per share) | $ 26.19 | $ 18.47 | $ 16.77
Intrinsic value of options | $ 13,200,000 | $ 2,500,000 | $ 3,700,000
Range of exercise prices, lower limit (in dollars per share) | $ 22.16 |  |
Range of exercise prices, upper limit (in dollars per share) | $ 79.89 |  |
Employee Stock Option |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | $ 8,900,000 |  |
Weighted average period (year) | 2 years 6 months |  |
Grant-date fair value of options (in dollars per share) | $ 5,400,000 |  |
PSU |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | $ 9,700,000 |  |
Weighted average period (year) | 1 year 8 months 12 days |  |
Fair value other than options (in dollars per share) | $ 4,600,000 |  |
RSU |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | $ 4,500,000 |  |
Weighted average period (year) | 1 year 8 months 12 days |  |
Grant-date fair value of options (in dollars per share) | $ 3,900,000 |  |
Shareholder-approved stock options plan |  |  |
Stock-Based Compensation Plans |  |  |
Number of shares available for grant (in shares) | 2,442,749 |  |
Total unrecognized compensation cost | $ 1,568,551 |  |
Granted, shares (in shares) | 278,845 | 356,014 |
Weighted average grant-date fair value of options (in dollars per share) | $ 26.19 | $ 18.47 |
Deferred share unit plan |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | $ 0 | $ 0 |
Deferred share units outstanding number (in shares) | 311,081 | 283,338 |
Deferred compensation share-based arrangements, liability, current and noncurrent | $ 27,300,000 | $ 20,600,000 |
Deferred share units grants in period (in shares) | 27,743 |  |
Deferred share units redeemed and settled in cash (in shares) | 0 |  |
Deferred share units compensation expense | $ 6,700,000 | 3,200,000 | 4,500,000
Cash-settled restricted share unit |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | 800,000 | 700,000 |
Deferred compensation share-based arrangements, liability, current and noncurrent | 200,000 | 400,000 |
Cash settled restricted share units compensation expense | $ 600,000 | $ 800,000 | $ 1,300,000

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