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Basis of Presentation and Accounting Policies (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 23, 2016 USD ($) | Apr. 25, 2015 USD ($) | Apr. 23, 2016 USD ($) segment | Apr. 25, 2015 USD ($) | Jul. 30, 2016 | Jul. 25, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  |  | 1 |  |  |
Prepaid Expense and Other Assets | $ 17,300 |  | $ 17,300 |  |  | $ 13,600
Deferred Finance Costs, Net | 7,200 |  | 7,200 |  |  | 11,600
Insurance recoveries/receivables related to accrued claims | 5,900 |  | 5,900 |  |  | 9,500
Contract revenues | 664,645 | $ 492,363 | 1,883,383 | $ 1,443,833 |  |
Restricted cash | 5,000 |  | $ 5,000 |  |  | 4,500
Measurement period |  |  | 12 months |  |  |
Investments and other noncurrent assets | 4,000 |  | $ 4,000 |  |  | $ 4,000
Fiscal period duration |  |  |  |  |  | 364 days
Subsequent Event [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Fiscal period duration |  |  |  |  | 371 days |
Non-Current Other Assets |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Insurance recoveries/receivables related to accrued claims | 5,900 |  | 5,900 |  |  | $ 8,900
Canada |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Contract revenues | $ 900 | $ 2,000 | $ 5,500 | $ 9,800 |  |

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