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Sale of Energy, Chemicals and Resources ("ECR") Business - Narrative (Details) - USD ($) $ in Thousands, shares in Millions |  | 3 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 26, 2019 | Jul. 02, 2021 | Apr. 02, 2021 | Jun. 26, 2020 | Dec. 31, 2019 | Jul. 02, 2021 | Jun. 26, 2020 | Oct. 02, 2020 | Sep. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Proceeds (payments) related to sales of businesses |  |  |  |  |  | $ (36,360) | $ 5,061 |  |
Selling, general and administrative expenses |  | $ 553,189 |  | $ 434,650 |  | 1,779,435 | 1,408,232 |  |
Investment in equity securities |  | 450,113 |  |  |  | 450,113 |  | $ 347,510 |
(Gain) loss on investment in equity securities |  |  |  |  |  | (152,145) | 138,875 |  |
SG&A |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  | (200) | (15,200) |  |
NPMC |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  | 50,000 |  |
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] |  |  |  |  |  |  |  |  |
Proceeds (payments) related to sales of businesses |  |  | $ 36,400 |  |  |  |  |  |
Gain on sale of businesses |  | 0 | $ 15,600 | 31,456 |  | 15,608 | 113,366 | 110,200 | $ 935,100
Pre-tax gain on sale | 1,000,000 |  |  |  |  |  |  |  |
Fair value of retained interest | 33,000 |  |  |  |  |  |  |  |
Deferred gain on disposal | 34,400 |  |  |  |  |  |  |  |
Proceeds received on a relative fair value basis | $ 95,300 |  |  |  |  |  |  |  |
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 |  |  |  | 51.4 |  |  |  |
Investment in equity securities |  | 450,100 |  |  |  | 450,100 |  | $ 347,500 |
(Gain) loss on investment in equity securities |  | $ (36,800) |  | $ 131,400 |  | (102,600) | 138,900 |  |
Dividend income |  |  |  |  |  | $ 9,800 | $ 7,700 |  |

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