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Fair Value Measurements - Assets at Fairvalue - (Tables)
3 Months Ended
Oct. 27, 2012
Fair Value Measurements [Abstract]  
Fair Value Disclosures
      Quoted      
      Prices in      
      Active  Significant   
      Markets for  Other  Significant
      Identical  Observable  Unobservable
   October 27, 2012  Assets  Inputs  Inputs
Description    Level 1  Level 2  Level 3
             
State/Municipal Bonds $ 177,774 $ - $ 177,774 $ -
Corporate Bonds   15,414   -   15,414   -
Auction Rate Securities (ARS)   3,450   -   -   3,450
Variable Rate Demand Notes (VRDN)   10,495   10,495   -   -
US Treasury Notes   3,203   3,203   -   -
Privately Managed Funds   767   -   -   767
Corporate Equities   462   462   -   -
Certificates of Deposit   100   100   -   -
             
Total $211,665 $14,260 $ 193,188 $ 4,217

             
      Quoted      
      Prices in      
      Active  Significant   
      Markets for  Other  Significant
      Identical  Observable  Unobservable
   January 28, 2012  Assets  Inputs  Inputs
Description    Level 1  Level 2  Level 3
             
State/Municipal Bonds $ 152,650  $ - $ 152,650  $ -
Corporate Bonds   27,732    -   27,732    -
Auction Rate Securities (ARS)   3,450    -   -   3,450 
Variable Rate Demand Notes (VRDN)   26,472    26,472    -   -
U.S. Treasury Notes   3,174    3,174    -   -
Privately Managed Funds   1,604    -   -   1,604 
Corporate Equities   443    443    -   -
Certificates of Deposit   100    100    -   -
             
Total $215,625 $ 30,189  $ 180,382  $ 5,054 
             

             
NOTE 7 – FAIR VALUE MEASUREMENTS (CONTINUED):
             
             
      Quoted      
      Prices in      
      Active  Significant   
      Markets for  Other  Significant
      Identical  Observable  Unobservable
   October 29, 2011  Assets  Inputs  Inputs
Description    Level 1  Level 2  Level 3
             
State/Municipal Bonds $146,936 $ - $146,936 $ -
Corporate Bonds  29,670   -  29,670   -
Auction Rate Securities (ARS)  3,450   -   -  3,450
Variable Rate Demand Notes (VRDN)  30,439  30,439   -   -
US Treasury Notes  1,421  1,421   -   -
Privately Managed Funds  1,910   -   -  1,910
Corporate Equities  481  481   -   -
Certificates of Deposit  100  100   -   -
             
Total $214,407 $32,441 $176,606 $5,360