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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 | 6 Months Ended
--- | --- | ---
Mar. 27, 2020 | Mar. 29, 2019 | Mar. 27, 2020 | Mar. 29, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | $ 92,627 |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 40,586 | $ 69,622 | 92,627 | $ 109,023
CH2M HILL Companies, Ltd. | Continuing Operations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 40,586 | 66,821 | 92,627 | 111,880
CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 31,265 | 18,854 | 68,862 | 53,065
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 3,785 | 341 | 8,076 | 790
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 5,536 | 47,626 | 15,689 | 58,025
CH2M HILL Companies, Ltd. | Energy, Chemicals and Resources (included in Discontinued Operations) | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 0 | 2,801 | 0 | (2,857)
Other Expense | CH2M HILL Companies, Ltd. | Continuing Operations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | 93,900 |  | $ 141,200
Other Expense | CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain (loss) related to settlement |  | $ 32,400 | $ (2,100) |

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