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Restructuring and Other Charges - Schedule of Restructuring and Other Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 01, 2022 | Jul. 02, 2021 | Jul. 01, 2022 | Jul. 02, 2021
Restructuring Reserve [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 14,031 |
Net(Credits) Charges |  |  | 19,604 |
Payments and other |  |  | (25,297) |
Ending balance | $ 8,338 |  | 8,338 |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other net charges |  |  | 162,500 |
People & Places Solutions |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Real estate impairment and other transformation activities |  |  | 71,200 |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Real estate impairment and other transformation activities |  |  | 71,200 |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Net(Credits) Charges | $ 4,577 | $ 13,768 | 182,100 | $ 92,509
Real estate impairment and other transformation activities |  |  | 77,000 |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Loss related to settlement |  |  | 91,300 |
Real estate impairment and other transformation activities |  |  | $ 77,000 |

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