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Accounts Receivable (Tables)
 12 Months Ended
Jul. 29, 2017
Receivables [Abstract]  
Schedule of Accounts Receivable
The Company maintains an allowance for doubtful accounts for estimated losses on uncollected balances. The allowance for doubtful accounts changed as follows (dollars in thousands):
 
Fiscal Year Ended
 
2017
 
2016
Allowance for doubtful accounts at beginning of period
$
1,603

 
$
1,216

Bad debt expense
199

 
1,252

Amounts charged against the allowance
(967
)
 
(865
)
Allowance for doubtful accounts at end of period
$
835

 
$
1,603

Accounts receivable consisted of the following (dollars in thousands):
 
July 29, 2017
 
July 30, 2016
Contract billings
$
348,990

 
$
297,532

Retainage
21,645

 
32,101

Total
370,635

 
329,633

Less: allowance for doubtful accounts
(835
)
 
(1,603
)
Accounts receivable, net
$
369,800

 
$
328,030