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Net Income per Common Share - Reconciliation of Weighted Average Common Shares Outstanding Used for Computation of Basic and Diluted Net Income per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2024
Oct. 31, 2023
Earnings Per Share [Abstract]        
Net Income (Loss) $ 102,911 $ 83,014 $ 282,161 $ 239,923
Basic weighted-average common shares outstanding 92,270,583 92,780,736 92,819,987 92,667,878
Effect of dilutive options, performance stock units and restricted stock units 1,587,267 1,667,640 1,692,002 1,500,180
Diluted weighted-average shares outstanding 93,857,850 94,448,376 94,511,989 94,168,058
Basic $ 1.12 $ 0.89 $ 3.04 $ 2.59
Diluted $ 1.1 $ 0.88 $ 2.99 $ 2.55