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Restructuring and Other Charges - Schedule of Restructuring and Other Activities by Major Type of Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2025 | Sep. 27, 2024 | Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023
Interest Rate Swap |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Derivative, gain on derivative | $ 35,200 | $ 35,200 |  | $ 35,200 |
CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | $ 61,316 | 134,911 | $ 126,219
Lease Abandonments and Impairments | CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | 0 | 49 | 44,788
Voluntary and Involuntary Terminations | CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | 29,753 | 47,881 | 37,235
Outside Services | CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | 24,651 | 100,593 | 35,099
Other | CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | $ 6,912 | $ (13,612) | $ 9,097

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