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Shareholders' Equity - Share Repurchase Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Apr. 30, 2025	Apr. 30, 2024
Equity, Class of Treasury Stock [Line Items]
Total cost		$ 173,369	$ 14,445
Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Number of common shares repurchased and subsequently retired		3,274,260	0
Total cost	[1]	$ 151,935	$ 0
Average cost per share, including commissions		$ 46.4	$ 0
[1] Under the Inflation Reduction Act, the Company's share repurchases, net of issuances, are subject to a 1% excise tax. The total cost of share repurchases during the three months ended April 30, 2025, excludes excise tax incurred of $1,193.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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