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Sale of Energy, Chemicals and Resources ("ECR") Business - Narrative (Details) - USD ($) $ in Thousands, shares in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 26, 2019 | Jul. 01, 2022 | Dec. 31, 2021 | Jul. 02, 2021 | Jan. 01, 2021 | Dec. 27, 2019 | Jul. 01, 2022 | Jul. 02, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds related to sales of businesses |  |  |  |  |  |  | $ 0 | $ (36,360)
Gain on investment in equity securities |  |  |  |  |  |  | 13,862 | 152,145
Dividends |  | $ 29,479 |  | $ 27,586 |  |  | $ 59,473 | 55,101
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 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 |  |  |  | $ 36,800 |  |  |  | 102,600
Dividends |  |  |  |  |  |  |  | $ 9,800

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