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Net Income per Common Share - Additional Information (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common shares 205,000 160,000 202,500 180,000
Anti-dilutive common shares exercise price, minimum $ 23.74 $ 38.09 $ 23.74 $ 35.85
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     167,500 30,001