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Stock-Based Compensation Plans - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Stock-Based Compensation Plans      
Number of Stock Options Outstanding (in shares), Beginning 1,593,433 1,319,279  
Weighted-Average Exercise Price (in dollars per share), Beginning $ 45.54 $ 42.35  
Weighted-Average Remaining Contractual Life (years) 3 years 10 months 24 days 4 years 1 month 6 days 4 years 4 months 24 days
Aggregate Intrinsic Value $ 54.8 $ 45.7 $ 41.5
Granted, shares (in shares) 278,845 356,014 271,025
Granted, weighted-average exercise price (in dollars per share) $ 79.80 $ 61.09  
Exercised, shares (in shares) (285,808) (63,890)  
Exercised, weighted-average exercise price (in dollars per share) $ 33.06 $ 27.34  
Forfeited, shares (in shares) (17,919) (17,970)  
Forfeited, weighted-average exercise price (in dollars per share) $ 62.30 $ 52.98  
Number of Stock Options Outstanding (in shares), Ending 1,568,551 1,593,433 1,319,279
Weighted-Average Exercise Price (in dollars per share), Ending $ 52.31 $ 45.54 $ 42.35
Vested or expected to vest, shares (in shares) 1,568,551    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 52.31    
Vested or expected to vest, weighted-average remaining contractual life (Year) 3 years 10 months 24 days    
Vested or expected to vest, aggregate intrinsic value $ 54.8    
Exercisable, shares (in shares) 1,121,998    
Exercisable, weighted-average exercise price (in dollars per share) $ 46.46    
Exercisable, weighted-average remaining contractual life (Year) 3 years 3 months 18 days    
Exercisable, aggregate intrinsic value $ 45.7