Costs and Estimated Earnings in Excess of Billings (Details) - USD ($) $ in Thousands	Jan. 23, 2016	Jul. 25, 2015
Contractors [Abstract]
Costs incurred on contracts in progress	$ 281,479	$ 240,077
Estimated to date earnings	74,757	72,446
Total costs and estimated earnings	356,236	312,523
Less: billings to date	(68,146)	(54,689)
Total costs in excess of billings	288,090	257,834
Costs and estimated earnings in excess of billings	302,393	274,730
Billings in excess of costs and estimated earnings	(14,303)	(16,896)
Total costs in excess of billings	$ 288,090	$ 257,834