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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
--- | --- | ---
Jul. 02, 2021 | Jun. 26, 2020 | Jul. 02, 2021 | Jun. 26, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 13,768 | $ 19,681 | $ 92,509 | $ 112,309
Impairment of equity method investment |  |  | (40,138) | 0
AWE Management Ltd |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment of equity method investment |  |  | (38,900) |
CH2M HILL Companies, Ltd. | Other Expense |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Loss related to settlement |  |  |  | 2,100
CH2M HILL Companies, Ltd. | Continuing Operations | Other Expense |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 8,000 | 19,700 | 53,600 | 109,600
CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 10,904 | 12,690 | 65,929 | 81,554
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 921 | 3,173 | 4,840 | 11,248
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 592 | 3,818 | 7,291 | 19,507
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 1,351 | $ 0 | $ 14,449 | $ 0

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