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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 | 9 Months Ended
--- | --- | ---
Jun. 26, 2020 | Jun. 28, 2019 | Jun. 26, 2020 | Jun. 28, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 19,681 | $ 93,239 | $ 112,309 | $ 205,119
Lease Abandonments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | (11,776) | 22,982 | (7,860) | 72,296
Involuntary Terminations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | (49) | 12,020 | 18,222 | 22,944
Outside Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 20,865 | 39,853 | 74,223 | 95,130
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 10,641 | $ 18,384 | $ 27,724 | $ 14,749

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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 http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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