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Marketable Securities (Tables)
9 Months Ended
May 07, 2011
Marketable Securities [Abstract]  
Available-for-sale marketable securities
The Company’s available-for-sale marketable securities consisted of the following:
                                 
    May 7, 2011  
    Amortized     Gross     Gross        
    Cost     Unrealized     Unrealized        
(in thousands)   Basis     Gains     Losses     Fair Value  
 
                               
Corporate securities
  $ 25,895     $ 297     $ (2 )   $ 26,190  
Government bonds
    29,919       180       (7 )     30,092  
Mortgage-backed securities
    5,449       88             5,537  
Asset-backed securities and other
    13,264       166             13,430  
 
                       
 
  $ 74,527     $ 731     $ (9 )   $ 75,249  
 
                       
                                 
    August 28, 2010  
    Amortized     Gross     Gross        
    Cost     Unrealized     Unrealized        
(in thousands)   Basis     Gains     Losses     Fair Value  
 
                               
Corporate securities
  $ 28,707     $ 490     $ (1 )   $ 29,196  
Government bonds
    24,560       283             24,843  
Mortgage-backed securities
    8,603       192             8,795  
Asset-backed securities and other
    9,831       47       (11 )     9,867  
 
                       
 
  $ 71,701     $ 1,012     $ (12 )   $ 72,701