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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. 29, 2019 | Mar. 30, 2018 | Mar. 29, 2019 | Mar. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  | $ 141,472 |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | $ 69,622 | $ 69,351 | 109,023 | $ 88,701
CH2M HILL Companies, Ltd. | Continuing Operations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 66,821 | 76,939 | 111,880 | 92,668
CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 18,854 | 57,243 | 53,065 | 69,768
CH2M HILL Companies, Ltd. | Aerospace, Technology and Nuclear | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 341 | 1,409 | 790 | 1,722
CH2M HILL Companies, Ltd. | Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 47,626 | 18,287 | 58,025 | 21,178
CH2M HILL Companies, Ltd. | Energy, Chemicals and Resources | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 2,801 | $ (7,588) | (2,857) | $ (3,967)
Other Expense | CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Litigation expenses included in segment profit | $ 32,400 |  |  |
Other Expense | Other(1) | CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Litigation expenses included in segment profit |  |  | $ 34,600 |

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