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Shareholder Rights Plan (Details) (USD $)
12 Months Ended 12 Months Ended
Aug. 01, 2014
Aug. 02, 2013
Aug. 01, 2014
April 9, 2012 Shareholder Rights Plan [Member]
Apr. 09, 2012
April 9, 2012 Shareholder Rights Plan [Member]
PreferredShare
Aug. 01, 2014
April 9, 2012 Shareholder Rights Plan [Member]
Series A Junior Participating Preferred Stock [Member]
Shareholder Rights Plan [Line Items]          
Dividend declaration date     Apr. 09, 2012    
Number of preferred share purchase right declared as dividend for each share of common stock outstanding       1  
Dividend record date     Apr. 20, 2012    
Dividend payment date     Apr. 20, 2012    
Rights expiration date     Apr. 09, 2015    
Par value of common share outstanding (in dollars per share) $ 0.01 $ 0.01 $ 0.01    
Exercise price of each right (in dollars per share)     $ 200.00    
Common share equivalent for each preferred share portion (in shares)         1
Minimum number of days before rights can be exercised     10 days    
Minimum percentage of outstanding common stock ownership required to qualify for an "Acquiring Person" (in hundredths)     20.00%    
Quarterly dividends payments per share (in dollars per share)         $ 0.01
Amount entitled to receive per share upon liquidation of preferred share (in dollars per share)         $ 1.00
Redemption price of the right (in dollars per share)     $ 0.01    
Minimum offering period     60 days    
Subsequent offering period     20 days    
Minimum percentage of an ownership of common stock by an Acquiring Person before board of directors may extinguish right (in hundredths)     50.00%    
Number of common stock shares that can be exchanged for each right if rights were extinguished (in shares)     1