v3.25.4
Stock-Based Compensation Plans - Additional information (Details) - USD ($)
 12 Months Ended
Jan. 31, 2026
Jan. 31, 2025
Jan. 31, 2024
Stock-Based Compensation Plans      
Amount before allocation of valuation allowances of deferred tax asset $ 1,600,000 $ 1,200,000  
Tax benefit realized in connection with stock options exercised $ 400,000 $ 200,000 $ 400,000
Number of stock options outstanding (in shares) 1,555,101 1,501,901 1,568,551
Granted, shares (in shares) 432,191 280,658 278,845
Weighted average grant-date fair value of options (in dollars per share) $ 30.13 $ 29.53 $ 26.19
Intrinsic value of options $ 16,400,000 $ 20,300,000 $ 13,200,000
Range of exercise prices, lower limit (in dollars per share) $ 36.19    
Range of exercise prices, upper limit (in dollars per share) $ 119.58    
Stock options      
Stock-Based Compensation Plans      
Total unrecognized compensation cost $ 13,500,000    
Weighted average period (year) 2 years 9 months 18 days    
Grant-date fair value of options (in dollars per share) $ 7,500,000    
PSU      
Stock-Based Compensation Plans      
Total unrecognized compensation cost $ 10,900,000    
Weighted average period (year) 1 year 8 months 12 days    
Fair value other than options (in dollars per share) $ 14,300,000    
RSU      
Stock-Based Compensation Plans      
Total unrecognized compensation cost $ 5,600,000    
Weighted average period (year) 1 year 8 months 12 days    
Grant-date fair value of options (in dollars per share) $ 5,100,000    
Shareholder-approved stock options plan      
Stock-Based Compensation Plans      
Number of stock options outstanding (in shares) 1,555,101    
Number of shares available for grant (in shares) 1,820,430    
Granted, shares (in shares) 432,191 280,658  
Weighted average grant-date fair value of options (in dollars per share) $ 30.13 $ 29.53  
Deferred share unit plan      
Stock-Based Compensation Plans      
Total unrecognized compensation cost $ 0 $ 0  
Deferred share units outstanding number (in shares) 301,043 332,473  
Deferred compensation share-based arrangements, liability, current and noncurrent $ 22,500,000 $ 38,600,000  
Deferred share units grants in period (in shares) 19,035    
Deferred share units redeemed and settled in cash (in shares) 50,465    
Deferred share units compensation expense (recovery) $ (13,200,000) 13,900,000 6,700,000
Cash-settled restricted share unit      
Stock-Based Compensation Plans      
Total unrecognized compensation cost 800,000 1,200,000  
Deferred compensation share-based arrangements, liability, current and noncurrent 100,000 200,000  
Cash settled restricted share units compensation expense $ 800,000 $ 800,000 $ 600,000