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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 02, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Segment Reporting Information [Line Items]
Total Segment Operating Profit	$ 22,474	$ 194,376	$ 167,778	$ 151,345	$ 99,086	$ 89,954	$ 102,681	$ 113,130	$ 535,973	$ 404,851	$ 387,443
Restructuring, Transaction and Other Charges									(327,413)	(355,235)	(234,387)
Total Other (Expense) Income, net									(94,770)	(53,892)	(56,462)
Earnings from Continuing Operations Before Taxes	$ 60,158	$ 303,681	$ (176,805)	$ 254,169	$ 53,537	$ 93,399	$ 111,832	$ 92,191	441,203	350,959	330,981
Restructuring charges excluded segment profit									324,183
Other expense income										14,800	25,600
Intangibles amortization									90,600	79,100	68,100
U.S. Plans
Segment Reporting Information [Line Items]
Gain (loss) on litigation settlement									(2,700)
ECR Business
Segment Reporting Information [Line Items]
Amortization of deferred financing fees									74,300	64,800
CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit									324,183	311,332	190,806
Amortization of deferred financing fees									700	3,200	1,800
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit									1,112,777	1,024,437	783,618
Corporate Non Segment
Segment Reporting Information [Line Items]
Other Corporate Expenses									(249,391)	(264,351)	(161,788)
Corporate Non Segment | CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Restructuring charges excluded segment profit									129,469	184,646	77,148
Critical Mission Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit									372,070	310,043	255,718
Litigation expenses included in segment profit											15,000
People & Places Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit									740,707	714,394	$ 527,900
Restructuring charges excluded segment profit										25,000
Other Expense | ECR Business
Segment Reporting Information [Line Items]
TSA related income									$ 15,800	$ 35,400

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