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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 | Dec. 31, 2021 | Apr. 02, 2021 | Jan. 01, 2021 | 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 on investment in equity securities |  | $ 0 |  | $ (190,368) |  |  |
Worley |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Consideration transferred | $ 3,400,000 |  |  |  |  |  |
Consideration paid in cash | 2,800,000 |  |  |  |  |  |
Worley | Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Pre-tax gain on sale | $ 1,100,000 |  |  |  |  |  |
Gain on sale of businesses |  |  | $ 15,600 |  | $ 15,600 | $ 110,200 | $ 935,100
Proceeds (payments) related to sales of businesses |  |  | $ 36,400 |  |  |  |
Worley Stock |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Ordinary shares included in purchase price (in shares) | 58.2 |  |  |  |  |  |
Gain on investment in equity securities |  |  |  | $ (107,700) |  |  |

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