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Commitments and Contingencies (Details) - USD ($) |  |  |  |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 29, 2016 | Sep. 30, 2015 | Aug. 20, 2015 | May 02, 2012 | Aug. 31, 2017 | Jun. 29, 2018 | Sep. 29, 2017 | Sep. 28, 2012
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation amount | $ 4,700,000 |  |  |  |  |  |  |
UGL Infrastructure Pty Limited |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture |  |  |  |  |  |  |  | 50.00%
Nui Phao Mining Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages sought |  | $ 167,000,000 |  |  |  |  |  |
Judicial Council Of California - Unpaid Fees |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation amount |  |  |  | $ 4,700,000 |  |  |  |
Litigation contract amount |  |  | $ 4,700,000 |  |  |  |  |
Judicial Council Of California, Disgorged Fees |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation amount |  |  |  | $ 18,300,000 |  |  |  |
Litigation contract amount |  |  | $ 18,300,000 |  |  |  |  |
General Electric and GE Electrical International Inc | Pending Litigation | Minimum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | $ 665,500,000.0 |  |  |
JKC Australia LNG Pty Limited | Pending Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | 1,700,000,000 |  |  |
Line of Credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 449,200,000 | $ 262,100,000 |
Surety Bond |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 875,300,000 | $ 57,400,000 |
CH2M HILL Companies, Ltd. | JKC Australia LNG Pty Limited | Pending Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | $ 26,000,000 |  |  |

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