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Costs and Estimated Earnings in Excess of Billings (Details) - USD ($) $ in Thousands | Apr. 29, 2017 | Jul. 30, 2016
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Contractors [Abstract] |  |
Costs incurred on contracts in progress | $ 373,504 | $ 307,826
Estimated to date earnings | 100,814 | 92,226
Total costs and estimated earnings | 474,318 | 400,052
Less: billings to date | (48,308) | (42,637)
Total costs in excess of billings | 426,010 | 357,415
Costs and estimated earnings in excess of billings | 440,895 | 376,972
Billings in excess of costs and estimated earnings | $ (14,885) | $ (19,557)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57788-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57807-111642 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57795-111642 + Details
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