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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		9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Segment Reporting Information [Line Items]
Revenues	$ 3,169,622	$ 2,933,623	$ 9,345,005	$ 7,587,916
Total Segment Operating Profit	89,954	162,512	305,763	226,596
Restructuring and Other Charges	(92,407)	(30,544)	(233,579)	(122,744)
Total Other (Expense) Income, net	3,445	(15,879)	(8,344)	(38,016)
Earnings from Continuing Operations Before Taxes	93,399	146,633	297,419	188,580
Amortization of Intangible Assets			(56,346)	(58,495)
CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Transaction Costs	(12,738)	(4,420)	(12,738)	(76,915)
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Profit	259,624	232,278	737,754	557,418
Corporate
Segment Reporting Information [Line Items]
Other Corporate Expenses (1)	(64,525)	(34,802)	(185,674)	(131,163)
Corporate | CH2M HILL Companies, Ltd. | Other Expense
Segment Reporting Information [Line Items]
Litigation expenses included in segment profit	0
Amortization of deferred financing fees	500	500	1,500	1,200
Aerospace, Technology and Nuclear | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,156,488	1,021,523	3,251,024	2,656,303
Total Segment Operating Profit	76,306	69,085	222,289	182,609
Buildings, Infrastructure and Advanced Facilities | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,013,134	1,912,100	6,093,981	4,931,613
Total Segment Operating Profit	183,318	163,193	515,465	374,809
ECR Business
Segment Reporting Information [Line Items]
Transaction Costs	(33,300)		(41,900)
ECR Business | Corporate | Other Expense
Segment Reporting Information [Line Items]
Other Corporate Expenses (1)	(2,000)	(6,400)	(14,800)	(19,200)
Amortization of Intangible Assets	(18,400)	$ (19,300)	(55,700)	$ (49,100)
ECR Business | Corporate | Revenue
Segment Reporting Information [Line Items]
Other Corporate Expenses (1)	$ (14,100)		$ 0

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