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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
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Jul. 01, 2022 | Jul. 02, 2021 | Jul. 01, 2022 | Jul. 02, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | $ 19,604 |
Impairment of long-lived assets and equity method investment |  |  | 74,585 | $ 40,138
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 |  | $ 38,900 |  | 38,900
People & Places Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Real estate impairment and other transformation activities |  |  | 71,200 |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 4,577 | 13,768 | 182,100 | 92,509
Loss related to settlement |  |  | 91,300 |
Real estate impairment and other transformation activities |  |  | 77,000 |
CH2M HILL Companies, Ltd. | Operating profit (mainly SG&A) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 4,707 | 8,058 | 192,782 | 53,638
CH2M HILL Companies, Ltd. | Other (Income) Expense, net |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | (130) | 5,710 | (10,682) | 38,871
CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 4,048 | 10,904 | 113,399 | 65,929
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | (255) | 921 | 4,361 | 4,840
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 25 | 592 | 61,865 | 7,291
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 759 | $ 1,351 | $ 2,475 | $ 14,449

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