v3.26.1
Shareholders' Equity - Share Repurchase Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Equity, Class of Treasury Stock [Line Items]        
Total cost $ 543 $ 844 $ 324,699 $ 174,213
Share Repurchase Program        
Equity, Class of Treasury Stock [Line Items]        
Number of common shares repurchased and subsequently retired 0 0 4,639,208 3,274,260
Total cost [1] $ 0 $ 0 $ 299,996 $ 151,935
Average cost per share, including commissions $ 0 $ 0 $ 64.67 $ 46.4
[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, 2026 and 2025, excludes excise tax incurred of $2,611 and $1,134, respectively.