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Restructuring and Other Charges - Summary of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 30, 2022 | Dec. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 6,685 |
Real estate impairment charges | 27,100 | $ 72,300
Gain (loss) on termination of lease | 600 | 6,900
CH2M HILL Companies, Ltd. |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 34,443 | 69,359
Real estate impairment charges | 27,800 | 71,000
CH2M HILL Companies, Ltd. | Operating profit (mainly SG&A) |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 35,072 | 77,903
CH2M HILL Companies, Ltd. | Other (Income) Expense, net |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | (629) | (8,544)
CH2M HILL Companies, Ltd. | Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 3,333 | 6,838
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 2,212 | 1,153
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 27,317 | 61,169
CH2M HILL Companies, Ltd. | Divergent Solutions | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 1,581 | 0
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 0 | $ 199

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