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Stock Repurchase Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Dec. 04, 2015
Jul. 16, 2008
Mar. 09, 2006
Accelerated Share Repurchases [Line Items]            
Treasury Stock, Shares, Acquired 353,007 115,422 1,317      
Repurchases of Common Stock $ 85,000 $ 25,800 $ 210      
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 5,905,000 5,552,000        
Value of stock repurchased since inception $ 357,989 $ 272,989        
Remaining shares available for repurchase under existing program 1,595,277