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Shareholders' Equity - Share Repurchase Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Equity, Class of Treasury Stock [Line Items]        
Total cost $ 844 $ 53,034 $ 174,213 $ 67,479
Share Repurchase Program        
Equity, Class of Treasury Stock [Line Items]        
Number of common shares repurchased and subsequently retired 0 1,200,000 3,274,260 1,200,000
Total cost [1] $ 0 $ 52,262 $ 151,935 $ 52,262
Average cost per share, including commissions $ 0 $ 43.55 $ 46.4 $ 43.55
[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 six months ended July 31, 2025, excludes excise tax incurred of $1,134. The total cost of share repurchases during the three and six months ended July 31, 2024, excludes excise tax incurred of $240.