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Restructuring and Other Charges - Summary 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
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Dec. 30, 2022 | Dec. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | $ 34,443 | $ 69,359
Lease Abandonments and Impairments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 26,831 | 65,542
Voluntary and Involuntary Terminations |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 6,570 | 563
Outside Services |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 675 | 4,676
Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | $ 367 | $ (1,422)

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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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