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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. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  | $ 135,156 |
Operating Segments | Buildings, Infrastructure and Advanced Facilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | $ 22,600 |  | 22,600 |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 46,456 | $ 10,700 | 135,156 | $ 115,899
CH2M HILL Companies, Ltd. | Operating Segments | Aerospace, Technology, Environmental and Nuclear |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 16,936 | (18) | 18,655 | 1,628
CH2M HILL Companies, Ltd. | Operating Segments | Buildings, Infrastructure and Advanced Facilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 32,423 | 8,504 | 53,603 | 47,697
CH2M HILL Companies, Ltd. | Operating Segments | Energy, Chemicals and Resources |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 16,379 | (652) | 12,412 | 35,790
CH2M HILL Companies, Ltd. | Corporate (1) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | $ (19,282) | $ 2,866 | $ 50,486 | $ 30,784

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