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Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - CH2M HILL Companies, Ltd. - USD ($) $ in Thousands | 12 Months Ended
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Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 311,470 | $ 153,640 | $ 92,880
Lease Abandonments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 99,976 | 61,526 | 40,575
Involuntary Terminations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 33,742 | 29,056 | 34,797
Outside Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 133,148 | 35,987 | 4,236
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 44,604 | $ 27,071 | $ 13,272

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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=118932676&loc=d3e3602-108585 + Details
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