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Stock-Based Compensation Plans - Summary of Restricted Share Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Jul. 31, 2025
Jan. 31, 2025
Stock-Based Compensation Plans    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 71.73  
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 2 months 12 days  
Vested or expected to vest, aggregate intrinsic value $ 53.4  
RSU    
Stock-Based Compensation Plans    
Number of Units Outstanding (in shares), Beginning 489,689  
Weighted-Average Granted Date Fair Value (in dollars per share), Beginning $ 48.48  
Weighted-Average Remaining Contractual (years) 5 years 6 months 5 years
Aggregate Intrinsic Value $ 49.6 $ 59.8
RSUs Granted (in shares) 69,355  
RSUs Granted, weighted-average granted date fair value (in dollars per share) $ 101.07  
Exercised (in shares) (67,992)  
Exercised, weighted-average granted date fair value (in dollars per share) $ 28.46  
Forfeited (in shares) (17,053)  
Forfeited, weighted-average granted date fair value (in dollars per share) $ 93.91  
Number of Units Outstanding (in shares), Ending 473,999 489,689
Weighted-Average Granted Date Fair Value (in dollars per share), Ending $ 56.71 $ 48.48
Vested or expected to vest, RSU (in shares) 473,999  
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 56.71  
Vested or expected to vest, weighted-average remaining contractual life (Year) 5 years 6 months  
Vested or expected to vest, aggregate intrinsic value $ 49.6  
Exercisable, number of units (in shares) 359,621  
Exercisable, weighted-average granted date fair value (in dollars per share) $ 45.2  
Exercisable, weighted-average remaining contractual (years) 4 years 4 months 24 days  
Exercisable, aggregate intrinsic value $ 37.6