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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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