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Stock-Based Compensation Plans - Summary of Restricted Share Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2023
Stock-Based Compensation Plans      
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 61.06    
Vested or expected to vest, weighted-average remaining contractual life (Year) 3 years 9 months 18 days    
Vested or expected to vest, aggregate intrinsic value $ 91.6    
RSU      
Stock-Based Compensation Plans      
Number of Units Outstanding (in shares), Beginning 482,094 474,631  
Weighted-Average Granted Date Fair Value (in dollars per share), Beginning $ 40.19 $ 32.44  
Weighted-Average Remaining Contractual (years) 5 years 4 years 9 months 18 days 4 years 8 months 12 days
Aggregate Intrinsic Value $ 59.8 $ 42.1 $ 35.2
RSUs Granted (in shares) 62,597 61,774  
RSUs Granted, weighted-average granted date fair value (in dollars per share) $ 88.66 $ 79.89  
Exercised (in shares) (54,173) (53,898)  
Exercised, weighted-average granted date fair value (in dollars per share) $ 13.36 $ 8.52  
Forfeited (in shares) (829) (413)  
Forfeited, weighted-average granted date fair value (in dollars per share) $ 70.74 $ 60.66  
Number of Units Outstanding (in shares), Ending 489,689 482,094 474,631
Weighted-Average Granted Date Fair Value (in dollars per share), Ending $ 48.48 $ 40.19 $ 32.44
Vested or expected to vest, RSU (in shares) 489,689    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 48.48    
Vested or expected to vest, weighted-average remaining contractual life (Year) 5 years    
Vested or expected to vest, aggregate intrinsic value $ 59.8    
Exercisable, number of units (in shares) 427,613    
Exercisable, weighted-average granted date fair value (in dollars per share) $ 43.14    
Exercisable, weighted-average remaining contractual (years) 4 years 4 months 24 days    
Exercisable, aggregate intrinsic value $ 52.2