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Stock-Based Compensation Plans - Additional information (Details) - USD ($) | 12 Months Ended
--- | ---
Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2023
Stock-Based Compensation Plans |  |  |
Amount before allocation of valuation allowances of deferred tax asset | $ 1,200,000 | $ 1,000,000.0 |
Tax benefit realized in connection with stock options exercised | $ 200,000 | $ 400,000 | $ 400,000
Number of stock options outstanding (in shares) | 1,501,901 | 1,568,551 | 1,593,433
Granted, shares (in shares) | 280,658 | 278,845 | 356,014
Weighted average grant-date fair value of options (in dollars per share) | $ 29.53 | $ 26.19 | $ 18.47
Intrinsic value of options | $ 20,300,000 | $ 13,200,000 | $ 2,500,000
Range of exercise prices, lower limit (in dollars per share) | $ 26.44 |  |
Range of exercise prices, upper limit (in dollars per share) | $ 120.82 |  |
Stock options |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | $ 9,700,000 |  |
Weighted average period (year) | 2 years 4 months 24 days |  |
Grant-date fair value of options (in dollars per share) | $ 6,400,000 |  |
PSU |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | $ 10,600,000 |  |
Weighted average period (year) | 1 year 8 months 12 days |  |
Fair value other than options (in dollars per share) | $ 6,100,000 |  |
RSU |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | $ 5,100,000 |  |
Weighted average period (year) | 1 year 8 months 12 days |  |
Grant-date fair value of options (in dollars per share) | $ 4,500,000 |  |
Shareholder-approved stock options plan |  |  |
Stock-Based Compensation Plans |  |  |
Number of shares available for grant (in shares) | 2,177,290 |  |
Total unrecognized compensation cost | $ 1,501,901 |  |
Granted, shares (in shares) | 280,658 | 278,845 |
Weighted average grant-date fair value of options (in dollars per share) | $ 29.53 | $ 26.19 |
Deferred share unit plan |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | $ 0 | $ 0 |
Deferred share units outstanding number (in shares) | 332,473 | 311,081 |
Deferred compensation share-based arrangements, liability, current and noncurrent | $ 38,600,000 | $ 27,300,000 |
Deferred share units grants in period (in shares) | 21,392 |  |
Deferred share units redeemed and settled in cash (in shares) | 0 |  |
Deferred share based compensation expense | $ 13,900,000 | 6,700,000 | 3,200,000
Cash-settled restricted share unit |  |  |
Stock-Based Compensation Plans |  |  |
Total unrecognized compensation cost | 1,200,000 | 800,000 |
Deferred compensation share-based arrangements, liability, current and noncurrent | 200,000 | 200,000 |
Cash settled restricted share units compensation expense | $ 800,000 | $ 600,000 | $ 800,000

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