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Share Repurchase Program (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Jul. 31, 2019
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 95,618 197,896        
Additional number of shares authorized to repurchase       1,500,000 3,000,000  
Number of shares repurchased since inception 6,000,341 5,750,000 5,905,000      
Payments for Repurchase of Common Stock $ 21,444 $ 50,000        
Value of stock repurchased since inception $ 379,433 $ 322,989 $ 357,989      
Remaining shares available for repurchase under existing program 1,499,659