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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, 2022
Jan. 31, 2021
Jan. 31, 2020
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 42.35    
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 4 months 24 days    
Vested or expected to vest, aggregate intrinsic value $ 41.5    
Restricted Stock Units (RSUs) [Member]      
Number of Units Outstanding (in shares) 432,195 374,677  
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 19.98 $ 16.57  
Weighted-Average Remaining Contractual, PSU (Year) 5 years 4 years 8 months 12 days 5 years
Aggregate Intrinsic Value, PSU $ 30.3 $ 25.2 $ 16.8
Number of PSUs Granted (in shares) 50,099 57,518  
PSUs Granted, Weighted-Average Granted Date Fair Value (in dollars per share) $ 65.33 $ 43.25  
Exercised (in shares) (71,314)    
Exercised (in dollars per share) $ 7.14    
Number of Units Outstanding (in shares) 410,980 432,195 374,677
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 29.17 $ 19.98 $ 16.57
Vested or expected to vest, RSU (in shares) 410,980    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 29.17    
Vested or expected to vest, weighted-average remaining contractual life (Year) 5 years    
Vested or expected to vest, aggregate intrinsic value $ 30.3    
Exercisable, number of units (in shares) 355,765    
Exercisable, PSU weighted-average granted date fair value (in dollars per share) $ 24.62    
Exercisable, Weighted-Average Remaining Contractual, PSU (Year) 4 years 4 months 24 days    
Exercisable, Aggregate Intrinsic Value, PSU $ 26.3