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Accounts Receivable (Details) - USD ($)
$ in Thousands
Jan. 28, 2017
Jul. 30, 2016
Receivables [Abstract]    
Contract billings $ 279,441 $ 297,532
Retainage 30,733 32,101
Total 310,174 329,633
Less: allowance for doubtful accounts (1,307) (1,603)
Accounts receivable, net $ 308,867 $ 328,030