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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
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Dec. 27, 2019 | Dec. 28, 2018
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges | $ 52,041 |
Restructuring and other charges | 49,663 | $ 47,234
CH2M HILL Companies, Ltd. |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges | 52,041 | 39,401
CH2M HILL Companies, Ltd. | Continuing Operations |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges | 52,041 | 45,059
Restructuring and other charges | 49,700 | 47,200
CH2M HILL Companies, Ltd. | Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges | 37,597 | 33,386
CH2M HILL Companies, Ltd. | Aerospace, Technology and Nuclear | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges | 4,291 | 449
CH2M HILL Companies, Ltd. | Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges | 10,153 | 11,224
CH2M HILL Companies, Ltd. | Energy, Chemicals and Resources | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges | 0 | $ (5,658)
Other Expense | CH2M HILL Companies, Ltd. | Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Gain (loss) related to settlement | $ 2,200 |

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