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Costs and Estimated Earnings in Excess of Billings (Details) - USD ($) $ in Thousands	Oct. 29, 2016	Jul. 30, 2016
Contractors [Abstract]
Costs incurred on contracts in progress	$ 397,412	$ 307,826
Estimated to date earnings	119,012	92,226
Total costs and estimated earnings	516,424	400,052
Less: billings to date	(42,735)	(42,637)
Total costs in excess of billings	473,689	357,415
Costs and estimated earnings in excess of billings	488,960	376,972
Billings in excess of costs and estimated earnings	(15,271)	(19,557)
Total costs in excess of billings	$ 473,689	$ 357,415

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Estimated earnings, net of estimated losses on contracts in progress.

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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