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Contractual Guarantees, Litigation, Investigations, and Insurance (Narrative) (Details) $ in Millions |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 29, 2016 USD ($) | Sep. 30, 2015 USD ($) | Aug. 20, 2015 USD ($) | Aug. 09, 2014 USD ($) | May 02, 2012 USD ($) | Sep. 29, 2017 insurer
Loss Contingencies [Line Items] |  |  |  |  |  |
Minimum number of insurers with possible inability to fulfill insurance obligations | insurer |  |  |  |  |  | 1
Litigation amount | $ 4.7 |  |  |  |  |
Motiva Enterprises LLC v. Bechtel-Jacobs CEP Port Arthur Joint Venture | Pending Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages sought |  |  |  | $ 8,000.0 |  |
Nui Phao Mining Company |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages sought |  | $ 167.0 |  |  |  |
Judicial Council Of California - Unpaid Fees |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation amount |  |  |  |  | $ 4.7 |
Litigation contract amount |  |  | $ 4.7 |  |  |
Judicial Council Of California, Disgorged Fees |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation amount |  |  |  |  | $ 18.3 |
Litigation contract amount |  |  | $ 18.3 |  |  |

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