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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
May 05, 2017
Apr. 28, 2017
Apr. 29, 2016
Apr. 28, 2017
Apr. 29, 2016
Shareholders' Equity [Abstract]          
Number of shares issued from vesting of share-based compensation awards and stock option exercises (in shares)       86,439  
Tax withholding payment net of cash received from issuance of share based compensation awards       $ 6,031 $ 5,281
Share-based compensation expense       6,347 $ 8,893
Excess tax benefit realized upon exercise of share-based compensation awards       $ 1,203  
Dividends Payable [Line Items]          
Cash dividends paid (in dollars per share)   $ 1.15 $ 1.10 $ 3.45 $ 6.30
Cash dividends declared (in dollars per share)   $ 1.15 $ 1.10 3.45 $ 3.30
Regular Quarterly Dividend Declared in Q3 [Member]          
Dividends Payable [Line Items]          
Cash dividends declared (in dollars per share)       $ 1.15  
Dividend record date       Apr. 14, 2017  
Regular Quarterly Dividend Declared in Q3 [Member] | Subsequent Event [Member]          
Dividends Payable [Line Items]          
Cash dividends paid (in dollars per share) $ 1.15        
Dividend payment date May 05, 2017