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Sale of Energy, Chemicals and Resources ("ECR") Business - Narrative (Details) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 26, 2019 | Oct. 01, 2021 | Oct. 02, 2020 | Sep. 27, 2019
Worley |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Consideration transferred | $ 3,400.0 |  |  |
Consideration paid in cash | 2,800.0 |  |  |
Worley | Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Pre-tax gain on sale | $ 1,100.0 |  |  |
Gain on sale of businesses |  | $ 15.6 | $ 110.2 | $ 935.1
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 |  |  |

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