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Accounts Receivable
6 Months Ended
Jan. 28, 2012
Accounts Receivable [Abstract]  
Accounts Receivable
4. Accounts Receivable
 
Accounts receivable consists of the following:

   
January 28,
  
July 30,
 
   
2012
  
2011
 
   
(Dollars in thousands)
 
         
Contract billings
 $98,360  $136,371 
Retainage and other receivables
  4,747   2,549 
Total
  103,107   138,920 
Less: allowance for doubtful accounts
  (409)  (368)
Accounts receivable, net
 $102,698  $138,552 
 
As of January 28, 2012, the Company expected to collect all retainage balances above within the next twelve months.
  
The allowance for doubtful accounts changed as follows:

   
For the Three Months Ended
  
For the Six Months Ended
 
   
January 28,
  
January 29,
  
January 28,
  
January 29,
 
   
2012
  
2011
  
2012
  
2011
 
   
(Dollars in thousands)
 
              
Allowance for doubtful accounts at beginning of period
 $376  $581  $368  $559 
Bad debt expense, net
  32   13   68   87 
Amounts recovered (charged) against the allowance
  1   (48)  (27)  (100)
Allowance for doubtful accounts at end of period
 $409  $546  $409  $546