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Shareholders' Equity - Share Repurchase Activity (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
Equity, Class of Treasury Stock [Line Items]        
Total cost $ 281 $ 169 $ 67,760 $ 8,353
Share Repurchase Program        
Equity, Class of Treasury Stock [Line Items]        
Number of common shares repurchased and subsequently retired 0 0 1,200,000 0
Total cost [1] $ 0 $ 0 $ 52,262 $ 0
Average cost per share, including commissions $ 0 $ 0 $ 43.55 $ 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 and nine months ended October 31, 2024 excludes excise tax incurred of $234.