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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