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Restructuring and Other Charges - Summary of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 204,981
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 95,959	$ 46,456	204,981	$ 135,156
CH2M HILL Companies, Ltd. | Continuing Operations
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	93,239	30,077	205,119	122,744
CH2M HILL Companies, Ltd. | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	74,921	(19,282)	127,986	50,486
CH2M HILL Companies, Ltd. | Aerospace, Technology and Nuclear | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	7,699	16,936	8,489	18,655
CH2M HILL Companies, Ltd. | Buildings, Infrastructure and Advanced Facilities | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	10,619	32,423	68,644	53,603
CH2M HILL Companies, Ltd. | Energy, Chemicals and Resources | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2,720	$ 16,379	(138)	$ 12,412
Other Expense | CH2M HILL Companies, Ltd. | Corporate
Restructuring Cost and Reserve [Line Items]
Litigation expenses included in segment profit	$ 0
Other Expense | Other(1) | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Litigation expenses included in segment profit			$ 34,600

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