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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 | 12 Months Ended
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Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 311,470 |  |
CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 311,332 | $ 190,806 | $ 135,438
CH2M HILL Companies, Ltd. | Operating Segments | Critical Mission Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 17,989 | 20,254 | 2,356
CH2M HILL Companies, Ltd. | Operating Segments | People & Places Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 108,835 | 56,238 | 47,743
CH2M HILL Companies, Ltd. | Operating Segments | Continuing Operations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 311,470 | 153,640 | 92,880
CH2M HILL Companies, Ltd. | Operating Segments | Energy, Chemicals and Resources (included in Discontinued Operations) |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | (138) | 37,166 | 42,558
CH2M HILL Companies, Ltd. | Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 184,646 | $ 77,148 | $ 42,781

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