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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 | 9 Months Ended
--- | --- | ---
Jun. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  | $ 204,981 |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | $ 95,959 | $ 46,456 | 204,981 | $ 135,156
CH2M HILL Companies, Ltd. | Continuing Operations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 93,239 | 30,077 | 205,119 | 122,744
CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 74,921 | (19,282) | 127,986 | 50,486
CH2M HILL Companies, Ltd. | Aerospace, Technology and Nuclear | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 7,699 | 16,936 | 8,489 | 18,655
CH2M HILL Companies, Ltd. | Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 10,619 | 32,423 | 68,644 | 53,603
CH2M HILL Companies, Ltd. | Energy, Chemicals and Resources | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 2,720 | $ 16,379 | (138) | $ 12,412
Other Expense | CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Litigation expenses included in segment profit | $ 0 |  |  |
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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