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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
May 22, 2018
May 07, 2018
Apr. 27, 2018
Apr. 28, 2017
Apr. 27, 2018
Apr. 28, 2017
Shareholders' Equity [Abstract]            
Number of shares issued from vesting of share-based compensation awards and stock option exercises (in shares)         47,929  
Tax withholding payment net of cash received from issuance of share based compensation awards         $ 3,360 $ 6,031
Shares of common stock repurchased (in shares)         100,000  
Cost of shares repurchased         $ 14,772  
Share-based compensation expense         $ 6,063 $ 6,347
Dividends Payable [Line Items]            
Cash dividends paid (in dollars per share)     $ 1.20 $ 1.15 $ 3.60 $ 3.45
Cash dividends declared (in dollars per share)     $ 1.20 $ 1.15 $ 3.60 $ 3.45
Regular Quarterly Dividend Declared in Q3 [Member]            
Dividends Payable [Line Items]            
Dividend declaration date     Apr. 27, 2018      
Cash dividends declared (in dollars per share)     $ 1.20      
Dividend record date     Apr. 13, 2018      
Regular Quarterly Dividend Declared in Q3 [Member] | Subsequent Event [Member]            
Dividends Payable [Line Items]            
Cash dividends paid (in dollars per share)   $ 1.20        
Dividend payment date   May 07, 2018        
Regular Quarterly Dividend Declared in Q4 [Member] | Subsequent Event [Member]            
Dividends Payable [Line Items]            
Dividend declaration date May 22, 2018          
Cash dividends declared (in dollars per share) $ 1.25          
Dividend payment date Aug. 06, 2018          
Dividend record date Jul. 13, 2018          
Special Dividends Declared [Member] | Subsequent Event [Member]            
Dividends Payable [Line Items]            
Dividend declaration date May 22, 2018          
Cash dividends declared (in dollars per share) $ 3.75          
Dividend payment date Aug. 03, 2018          
Dividend record date Jul. 13, 2018