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Costs and Estimated Earnings in Excess of Billings (Details) - USD ($)
$ in Thousands
Jul. 30, 2016
Jul. 25, 2015
Contractors [Abstract]    
Costs incurred on contracts in progress $ 307,826 $ 240,077
Estimated to date earnings 92,226 72,446
Total costs and estimated earnings 400,052 312,523
Less: billings to date (42,637) (54,689)
Total costs in excess of billings 357,415 257,834
Costs and estimated earnings in excess of billings 376,972 274,730
Billings in excess of costs and estimated earnings (19,557) (16,896)
Total costs in excess of billings $ 357,415 $ 257,834