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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		9 Months Ended
	Jun. 27, 2025	Jun. 28, 2024	Jun. 27, 2025	Jun. 28, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges			$ 47,657
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 22,254	$ 53,971	47,657	$ 127,687
CH2M HILL Companies, Ltd. | Professional Services and Employee Seperation
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	22,000	50,800	47,100	120,300
CH2M HILL Companies, Ltd. | Infrastructure & Advanced Facilities | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	22,254	50,770	47,398	120,327
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 0	$ 3,201	$ 259	$ 7,360

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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