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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
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Jun. 26, 2020 | Dec. 27, 2019 | Jun. 28, 2019 | Jun. 26, 2020 | Jun. 28, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  |  | $ 112,309 |
CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | $ 19,681 |  | $ 95,959 | 112,309 | $ 204,981
CH2M HILL Companies, Ltd. | Continuing Operations |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 19,681 |  | 93,239 | 112,309 | 205,119
CH2M HILL Companies, Ltd. | Continuing Operations | Write-off of fixed assets |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 900 |  | 6,200
CH2M HILL Companies, Ltd. | Corporate |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 12,690 |  | 74,921 | 81,554 | 127,986
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 3,173 |  | 7,699 | 11,248 | 8,489
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 3,818 |  | 10,619 | 19,507 | 68,644
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 |  | 2,720 | 0 | (138)
Other Expense | CH2M HILL Companies, Ltd. | Continuing Operations |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | $ 19,700 |  |  |  |
Other Expense | CH2M HILL Companies, Ltd. | Corporate | United States |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Gain (loss) related to settlement |  | $ 2,700 | $ 0 | $ (2,100) | $ 34,600

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