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Share Repurchase Program (Details) - USD ($)
$ in Thousands
Oct. 31, 2021
Jul. 31, 2021
Oct. 31, 2020
Dec. 04, 2015
Jul. 16, 2008
Mar. 09, 2006
Accelerated Share Repurchases [Line Items]            
Number of shares authorized to repurchase 7,500,000         3,000,000
Additional number of shares authorized to repurchase       1,500,000 3,000,000  
Number of shares repurchased since inception 6,161,141 6,161,000 6,161,000      
Value of stock repurchased since inception $ 404,411 $ 404,411 $ 404,411      
Remaining shares available for repurchase under existing program 1,338,859