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Restructuring and Other Charges - Schedule of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2025	Mar. 29, 2024	Mar. 28, 2025	Mar. 29, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges			$ 25,403
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 10,663	$ 35,362	25,403	$ 73,716
CH2M HILL Companies, Ltd. | Professional Services and Employee Seperation
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	10,200		25,100	69,500
CH2M HILL Companies, Ltd. | Infrastructure & Advanced Facilities | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	10,168	32,378	25,144	69,557
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 495	$ 2,984	$ 259	$ 4,159

X

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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