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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. 30, 2018 | Mar. 31, 2017 | Mar. 30, 2018 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  | $ 88,701 |
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 | 69,351 | $ 52,266 | 88,701 | $ 84,007
CH2M HILL Companies, Ltd. | Operating Segments | Aerospace, Technology, Environmental and Nuclear |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 1,409 | 1,274 | 1,722 | 1,646
CH2M HILL Companies, Ltd. | Operating Segments | Buildings, Infrastructure and Advanced Facilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 18,287 | 9,996 | 21,178 | 18,002
CH2M HILL Companies, Ltd. | Operating Segments | Energy, Chemicals and Resources |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | (7,588) | 20,634 | (3,967) | 36,442
CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | $ 57,243 | $ 20,362 | $ 69,768 | $ 27,917

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