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Share Repurchase Program (Details) - USD ($)
$ in Thousands
6 Months Ended
Jan. 31, 2017
Jan. 31, 2018
Jul. 31, 2017
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 1,317          
Additional number of shares authorized to repurchase       1,500,000 3,000,000  
Number of shares repurchased since inception 5,436,000 5,436,000 5,436,000      
Payments for Repurchase of Common Stock $ 210          
Value of stock repurchased since inception $ 247,189 $ 247,189 $ 247,189      
Remaining shares available for repurchase under existing program   2,063,706