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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. 27, 2025 | Jun. 28, 2024 | Jun. 27, 2025 | Jun. 28, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 22,254 | $ 53,971 | $ 47,657 | $ 127,687
Lease Abandonments and Impairments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 0 | 0 | 0 | 49
Terminations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 15,556 | 22,304 | 20,444 | 44,211
Outside Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 6,684 | 27,906 | 23,052 | 71,198
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 14 | $ 3,761 | $ 4,161 | $ 12,229

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