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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
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Apr. 01, 2022 | Apr. 02, 2021 | Apr. 01, 2022 | Apr. 02, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | $ 14,929 |
Impairment of long-lived assets and equity method investment |  |  | 74,585 | $ 33,197
AWE Management Ltd |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain on termination of lease |  |  | (7,100) |
Impairment of long-lived assets and equity method investment |  | $ 33,200 |  | 33,200
People & Places Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Real estate impairment and other transformation activities |  |  | 71,000 |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 108,164 | 30,347 | 177,524 | 78,741
Loss related to settlement | 91,300 |  | 91,300 |
CH2M HILL Companies, Ltd. | Operating profit (mainly SG&A) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 110,171 | 25,052 | 188,075 | 45,544
CH2M HILL Companies, Ltd. | Other (Income) Expense, net |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | (2,007) | 5,295 | (10,551) | 33,197
CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 102,514 | 15,006 | 109,352 | 55,025
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 3,462 | 710 | 4,616 | 3,919
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 671 | 1,533 | 61,840 | 6,699
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 1,517 | $ 13,098 | $ 1,716 | $ 13,098

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