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Segment Information - Schedule of Total Revenues, Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Segment Reporting Information [Line Items]
Revenues from External Customers	$ 2,653,866	$ 2,514,751	$ 2,302,567	$ 2,551,604	$ 2,640,587	$ 2,693,873	$ 2,781,763	$ 2,847,934	$ 3,116,954	$ 2,907,541	$ 2,903,332	$ 3,187,005	$ 10,022,788	$ 10,964,157	$ 12,114,832
Total Operating Profit	106,993	$ 128,475	$ 68,173	88,628	$ 82,811	$ 109,556	$ 86,781	$ 59,450	$ 53,825	$ 100,434	$ 133,045	$ 158,223	392,269	338,598	445,527
Restructuring and Other Charges				$ (31,700)									(134,206)	(187,630)	(154,283)
Gain (Loss) on disposal of business and investments													10,880	(41,410)	(2,909)
Total Other Expense													(9,932)	(10,465)	(12,481)
Earnings Before Taxes													393,217	286,723	430,137
CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
CH2M Professional Fees and Integration Costs	$ (10,600)
Operating Segments
Segment Reporting Information [Line Items]
Total Operating Profit													625,170	586,328	615,549
Corporate Non-Segment
Segment Reporting Information [Line Items]
Other Corporate Items													(81,595)	(60,100)	(15,739)
Segment Reconciling Items | CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
CH2M Professional Fees and Integration Costs													(17,100)
Petroleum & Chemicals
Segment Reporting Information [Line Items]
Revenues from External Customers													2,466,192	3,259,499	4,214,129
Petroleum & Chemicals | Operating Segments
Segment Reporting Information [Line Items]
Total Operating Profit													113,858	126,604	138,351
Aerospace & Technology
Segment Reporting Information [Line Items]
Revenues from External Customers													2,360,613	2,657,433	2,924,753
Aerospace & Technology | Operating Segments
Segment Reporting Information [Line Items]
Total Operating Profit													202,595	203,808	205,368
Buildings & Infrastructure
Segment Reporting Information [Line Items]
Revenues from External Customers													2,452,321	2,253,512	2,458,379
Restructuring and Other Charges													(23,844)
Buildings & Infrastructure | Operating Segments
Segment Reporting Information [Line Items]
Total Operating Profit													193,455	174,648	145,299
Industrial
Segment Reporting Information [Line Items]
Revenues from External Customers													2,743,662	2,793,713	2,517,571
Industrial | Operating Segments
Segment Reporting Information [Line Items]
Total Operating Profit													$ 115,262	$ 81,268	$ 126,531

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