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Restructuring and Other Charges - Schedule of Restructuring and Other Activities by Major Type of Costs (Details) - CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 27, 2026 | Mar. 28, 2025 | Mar. 27, 2026 | Mar. 28, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 14,171 | $ 10,663 | $ 18,169 | $ 25,403
Voluntary and Involuntary Termination |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 8,056 | 4,503 | 9,765 | 4,888
Outside Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 1,865 | 4,956 | 3,040 | 16,368
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 4,250 | $ 1,204 | 5,364 | $ 4,147
Professional Services Related to PA Consulting Transaction |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 2,200 |  | $ 2,500 |

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