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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 | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Jan. 01, 2016 | Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | $ 36,000 | $ 25,800 | $ 25,700 | $ 48,100 | $ 190,806 |  |
Operating Segments | Buildings, Infrastructure and Advanced Facilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  | $ 23,800 |
CH2M HILL Companies, Ltd. |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 190,806 | 135,438 | $ 187,907
CH2M HILL Companies, Ltd. | Operating Segments | Aerospace, Technology, Environmental and Nuclear |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 20,254 | 2,356 | 8,210
CH2M HILL Companies, Ltd. | Operating Segments | Buildings, Infrastructure and Advanced Facilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 56,238 | 47,743 | 24,566
CH2M HILL Companies, Ltd. | Operating Segments | Energy, Chemicals and Resources |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 37,166 | 42,558 | 113,315
CH2M HILL Companies, Ltd. | Corporate |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | $ 77,148 | $ 42,781 | $ 41,816

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