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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 | 3 Months Ended
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Dec. 27, 2019 | Dec. 28, 2018
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | $ 52,041 | $ 45,059
Lease Abandonments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 0 | 9,554
Involuntary Terminations |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 13,153 | 2,348
Outside Services |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 31,466 | 18,198
Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | $ 7,422 | $ 14,959

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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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