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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
	Dec. 27, 2024	Dec. 29, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 14,740
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	14,740	$ 38,354
CH2M HILL Companies, Ltd. | Professional Services and Employee Seperation
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	15,000	37,100
CH2M HILL Companies, Ltd. | Infrastructure & Advanced Facilities | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	14,976	37,179
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ (236)	$ 1,175

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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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