Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 23, 2016	Jan. 24, 2015	Jan. 23, 2016	Jan. 24, 2015
Real property and equipment leases
Related Party Transaction [Line Items]
Total expense under lease agreements	$ 688	$ 769	$ 1,438	$ 1,296
Subcontractors and materials expense
Related Party Transaction [Line Items]
Total expense under lease agreements	$ 760	$ 686	$ 1,851	$ 1,189