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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
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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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