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Stock-Based Compensation Plans - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Jan. 31, 2025
Stock-Based Compensation Plans          
Number of Stock Options Outstanding (in shares), Beginning     1,501,901    
Weighted-Average Exercise Price (in dollars per share), Beginning     $ 61.06    
Weighted-Average Remaining Contractual Life (years)     4 years 2 months 12 days   3 years 9 months 18 days
Aggregate Intrinsic Value $ 53.4   $ 53.4   $ 91.6
Granted, shares (in shares) 50,750 357 382,191 276,361  
Granted, weighted-average exercise price (in dollars per share)     $ 101.2    
Exercised, shares (in shares)     (204,845)    
Exercised, weighted-average exercise price (in dollars per share)     $ 40.57    
Forfeited, shares (in shares)     (61,292)    
Forfeited, weighted-average exercise price (in dollars per share)     $ 77.35    
Expired, shares (in shares)     (151)    
Expired, weighted-average exercise price (in dollars per share)     $ 77.12    
Number of Stock Options Outstanding (in shares), Ending 1,617,804   1,617,804   1,501,901
Weighted-Average Exercise Price (in dollars per share), Ending $ 71.73   $ 71.73   $ 61.06
Vested or expected to vest, shares (in shares) 1,617,804   1,617,804    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 71.73   $ 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   $ 53.4    
Exercisable, shares (in shares) 903,025   903,025    
Exercisable, weighted-average exercise price (in dollars per share) $ 57.02   $ 57.02    
Exercisable, weighted-average remaining contractual life (Year)     2 years 10 months 24 days    
Exercisable, aggregate intrinsic value $ 43.1   $ 43.1