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Share Repurchase Program (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Jul. 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
Treasury Stock, Shares, Acquired 160,800   256,418        
Additional number of shares authorized to repurchase         1,500,000 3,000,000  
Number of shares repurchased since inception 6,161,000 6,161,141 6,161,000 6,161,000      
Payments for Repurchase of Common Stock $ 25,000 $ 0 $ 46,422        
Value of stock repurchased since inception $ 404,411 $ 404,411 $ 404,411 $ 404,411      
Remaining shares available for repurchase under existing program   1,338,859