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Accounts Receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 25, 2015
Jul. 26, 2014
Jul. 27, 2013
Jul. 25, 2015
Apr. 25, 2015
Jul. 26, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Contract billings       $ 292,029   $ 258,254
Retainage       24,321   15,323
Total       316,350   273,577
Less: allowance for doubtful accounts $ (836) $ (129) $ (129) (1,216)   (836)
Accounts receivable, net       315,134   $ 272,741
Investments and other noncurrent assets         $ 4,000  
Allowance for Doubtful Accounts Receivable [Roll Forward]            
Allowance for doubtful accounts at beginning of period 836 129        
Bad debt expense 465 615 139      
Amounts recovered (charged) against the allowance (85) 92        
Allowance for doubtful accounts at end of period $ 1,216 $ 836 $ 129      
Customer on a Rural Project            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Contract billings       $ 6,800