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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 | 9 Months Ended
--- | --- | ---
Jun. 26, 2026 | Jun. 27, 2025 | Jun. 26, 2026 | Jun. 27, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 21,395 | $ 22,254 | $ 39,565 | $ 47,657
Voluntary and Involuntary Termination |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 11,084 | 15,556 | 20,850 | 20,444
Outside Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 3,973 | 6,684 | 7,014 | 23,052
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 6,338 | $ 14 | 11,701 | $ 4,161
Professional Services Related to PA Consulting Transaction |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 4,000 |  | $ 6,200 |

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