Accounts Receivable (Details) (USD $)	Oct. 25, 2014	Jul. 26, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract billings	$ 279,204,000	$ 258,254,000
Retainage and other receivables	18,458,000	15,323,000
Total	297,662,000	273,577,000
Less: allowance for doubtful accounts	(830,000)	(836,000)
Accounts receivable, net	296,832,000	272,741,000
Construction liens	17,700,000
Corporation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 20,100,000