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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