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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
	Apr. 30, 2025	Apr. 30, 2024
Earnings Per Share [Abstract]
Net Income (Loss)	$ 108,347	$ 61,765
Basic weighted-average common shares outstanding	91,752,408	93,124,568
Effect of dilutive options, performance stock units and restricted stock units	1,723,427	1,876,138
Diluted weighted-average shares outstanding	93,475,835	95,000,706
Basic	$ 1.18	$ 0.66
Diluted	$ 1.16	$ 0.65

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