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Costs and Estimated Earnings in Excess of Billings (Details) - USD ($)
$ in Thousands
Oct. 24, 2015
Jul. 25, 2015
Contractors [Abstract]    
Costs incurred on contracts in progress $ 285,180 $ 240,077
Estimated to date earnings 89,824 72,446
Total costs and estimated earnings 375,004 312,523
Less: billings to date (53,761) (54,689)
Total costs in excess of billings 321,243 257,834
Costs and estimated earnings in excess of billings 333,659 274,730
Billings in excess of costs and estimated earnings (12,416) (16,896)
Total costs in excess of billings $ 321,243 $ 257,834