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Accounts Receivable (Tables)
 12 Months Ended
Jul. 26, 2014
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable consists of the following:
 
July 26,
2014
 
July 27,
2013
 
(Dollars in thousands)
Contract billings
$
258,254

 
$
239,498

Retainage and other receivables
15,323

 
12,833

Total
273,577

 
252,331

Less: allowance for doubtful accounts
(836
)
 
(129
)
Accounts receivable, net
$
272,741

 
$
252,202
Schedule of Allowance for Doubtful Accounts
The Company maintains an allowance for doubtful accounts for estimated losses resulting from the failure of its customers to make required payments. The allowance for doubtful accounts changed as follows:

 
Fiscal Year Ended
 
July 26, 2014

 
July 27, 2013

 
(Dollars in thousands)
Allowance for doubtful accounts at beginning of period
$
129

 
$
270

Bad debt expense, net
615

 
139

Amounts recovered (charged) against the allowance
92

 
(280
)
Allowance for doubtful accounts at end of period
$
836

 
$
129