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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 | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Oct. 01, 2021 | Oct. 02, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | $ 25,824 |  |
Recorded third-party environmental recoveries receivable | $ 27,000 | 27,000 |  |
Impairment of real estate |  | 71,000 | $ 2,400 | $ 161,400
Gain (Loss) on Termination of Lease |  | (8,700) |  |
Impairment of equity method investment |  |  |  | (162,000)
AWE ML |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain (Loss) on Termination of Lease |  | (8,700) |  |
Impairment of equity method investment |  |  | (38,500) |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 161,063 | 99,590 | 324,183
Pre-tax settlement less insurance recoveries | 91,300 | 91,300 |  |
Impairment of real estate | $ 78,300 |  | 2,400 | 161,400
Gain (Loss) on Termination of Lease |  | 8,700 |  |
Impairment of equity method investment |  | (91,300) |  |
CH2M HILL Companies, Ltd. | Continuing Operations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 161,063 | 99,590 | 324,183
CH2M HILL Companies, Ltd. | Operating profit (mainly Selling, General and Administrative costs (“SG&A") |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 173,555 | 61,042 | 322,082
CH2M HILL Companies, Ltd. | Other (Income) Expense, net |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | (12,492) | 38,548 | 2,101
CH2M HILL Companies, Ltd. | Operating Segments | Critical Mission Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 5,626 | 5,079 | 24,083
CH2M HILL Companies, Ltd. | Operating Segments | People & Places Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 64,204 | 7,077 | 170,631
CH2M HILL Companies, Ltd. | Operating Segments | PA Consulting |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 4,253 | 15,566 | 0
CH2M HILL Companies, Ltd. | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | $ 86,980 | $ 71,868 | $ 129,469

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