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Net Income per Common Share - Additional Information (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Jul. 31, 2024
Jul. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common shares 40,000 40,000 40,000 80,000
Anti-dilutive common shares exercise price, minimum       $ 28.47
Anti-dilutive common shares exercise price, maximum $ 46.42 $ 46.42 $ 46.42 $ 46.42
Performance Stock Units (PSUs)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common shares     270,441 272,554