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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. 28, 2025 | Mar. 29, 2024 | Mar. 28, 2025 | Mar. 29, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 10,663 | $ 35,362 | $ 25,403 | $ 73,716
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 | 4,503 | 10,765 | 4,888 | 21,907
Outside Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 4,956 | 19,499 | 16,368 | 43,292
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 1,204 | $ 5,098 | $ 4,147 | $ 8,468

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