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Sale of Energy, Chemicals and Resources ("ECR") Business - Narrative (Details) - USD ($) $ in Thousands, shares in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 26, 2019 | Apr. 02, 2021 | Sep. 30, 2022 | Oct. 01, 2021 | Oct. 02, 2020 | Sep. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
(Gain) loss on investment in equity securities |  |  | $ (13,862) | $ (71,325) | $ 103,623 |
Worley Stock |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Equity instrument consideration, shares | 58.2 |  |  |  |  |
(Gain) loss on investment in equity securities |  |  |  | (40,700) | (103,600) |
Worley Stock | Restricted Stock |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Dividend income |  |  |  | 19,100 | 16,900 |
ECR Business |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration transferred | $ 3,400,000 |  |  |  |  |
Business combination consideration paid in cash | 2,800,000 |  |  |  |  |
ECR Business | Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on sale of businesses | $ 1,100,000 | $ 15,600 |  | $ 15,600 | $ 110,200 | $ 935,100
Proceeds from Legal Settlements |  | $ 36,400 |  |  |  |

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