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Share Repurchase Program (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2020
Oct. 31, 2019
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   95,618        
Additional number of shares authorized to repurchase       1,500,000 3,000,000  
Number of shares repurchased since inception 6,161,141 6,000,000 6,161,000      
Payments for Repurchase of Common Stock $ 0 $ 21,444        
Value of stock repurchased since inception $ 404,411 $ 379,433 $ 404,411      
Remaining shares available for repurchase under existing program 1,338,859