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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. 29, 2023 | Dec. 30, 2022
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 41,320 |
CH2M HILL Companies, Ltd. |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 41,369 | $ 34,443
CH2M HILL Companies, Ltd. | Operating profit (mainly SG&A) |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 41,369 | 35,072
Real estate impairment and other moving cost |  | 27,800
CH2M HILL Companies, Ltd. | Operating profit (mainly SG&A) | Professional Services and Employee Seperation |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 40,100 |
CH2M HILL Companies, Ltd. | Other (Income) Expense, net |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 0 | (629)
CH2M HILL Companies, Ltd. | Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 29,002 | 3,333
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 2,163 | 2,212
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 8,129 | 27,317
CH2M HILL Companies, Ltd. | Divergent Solutions | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 900 | 1,581
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 1,175 | $ 0

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