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Costs and Estimated Earnings in Excess of Billings (Details) - USD ($) $ in Thousands	Jul. 29, 2017	Jul. 30, 2016
Contractors [Abstract]
Costs incurred on contracts in progress	$ 327,312	$ 307,826
Estimated to date earnings	92,781	92,226
Total costs and estimated earnings	420,093	400,052
Less: billings to date	(40,091)	(42,637)
Total costs in excess of billings	380,002	357,415
Included in the accompanying consolidated balance sheets under the captions:
Costs and estimated earnings in excess of billings	389,286	376,972
Billings in excess of costs and estimated earnings	$ (9,284)	$ (19,557)

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