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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. 28, 2018 | Dec. 29, 2017
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | $ 39,401 | $ 19,349
Lease Abandonments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 2,484 | 3,363
Involuntary Terminations |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 2,909 | 2,184
Outside Services |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | 18,198 | 8,590
Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | $ 15,810 | $ 5,212

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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