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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, 2024
Jan. 31, 2024
Stock-Based Compensation Plans    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 60.37  
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 $ 69.2  
RSU    
Stock-Based Compensation Plans    
Number of Units Outstanding (in shares), Beginning 482,094  
Weighted-Average Granted Date Fair Value (in dollars per share), Beginning $ 40.19  
Weighted-Average Remaining Contractual (years) 5 years 6 months 4 years 9 months 18 days
Aggregate Intrinsic Value $ 50.8 $ 42.1
RSUs Granted (in shares) 62,597  
RSUs Granted, weighted-average granted date fair value (in dollars per share) $ 89.64  
Exercised (in shares) (51,752)  
Exercised, weighted-average granted date fair value (in dollars per share) $ 11.27  
Number of Units Outstanding (in shares), Ending 492,939 482,094
Weighted-Average Granted Date Fair Value (in dollars per share), Ending $ 49.12 $ 40.19
Vested or expected to vest, RSU (in shares) 492,939  
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 49.12  
Vested or expected to vest, weighted-average remaining contractual life (Year) 5 years 6 months  
Vested or expected to vest, aggregate intrinsic value $ 50.8  
Exercisable, number of units (in shares) 367,938  
Exercisable, weighted-average granted date fair value (in dollars per share) $ 38.29  
Exercisable, weighted-average remaining contractual (years) 4 years 3 months 18 days  
Exercisable, aggregate intrinsic value $ 37.9