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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Sep. 27, 2019
Segment Reporting Information [Line Items]
Total Segment Operating Profit	$ 688,089	$ 535,973	$ 404,851
Restructuring, Transaction and Other Charges	(350,394)	(327,413)	(355,235)
Total Other (Expense) Income, net	7,513	(94,770)	(53,892)
Earnings from Continuing Operations Before Taxes	695,602	441,203	350,959
Gain (loss) on litigation settlement	19,500
Restructuring charges excluded segment profit	99,590
Intangibles amortization	149,800	90,600	79,100
Other expense income			14,800
AWE ML
Segment Reporting Information [Line Items]
Impairment of equity method investment	(38,500)
C3.ai. Inc.
Segment Reporting Information [Line Items]
Fair value adjustments	(49,600)
ECR Business
Segment Reporting Information [Line Items]
Fair value adjustments	34,700	(74,300)	(64,800)
CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit	99,590	324,183	311,332
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit	1,378,612	1,112,777	1,024,437
Corporate Non Segment
Segment Reporting Information [Line Items]
Other Corporate Expenses	(340,129)	(249,391)	(264,351)
Corporate Non Segment | CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit	71,868	129,469	184,646
Critical Mission Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit	447,161	372,070	310,043
People & Places Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit	780,380	740,707	714,394
Restructuring charges excluded segment profit			25,000
PA Consulting
Segment Reporting Information [Line Items]
One time charges	297,800
PA Consulting | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit	151,071	0	0
PA Consulting | Operating Segments | CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit	15,566	0	0
Other Expense | ECR Business
Segment Reporting Information [Line Items]
TSA related income	200	$ 15,800	35,400
Other Expense | CH2M HILL Companies, Ltd. | Other
Segment Reporting Information [Line Items]
Gain (loss) on litigation settlement	$ (2,100)		$ 35,000

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