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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 | 9 Months Ended
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Jun. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 95,959 | $ 46,456 | $ 204,981 | $ 135,156
Lease Abandonments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 22,982 | 14,678 | 66,341 | 55,114
Involuntary Terminations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 12,020 | 10,215 | 22,979 | 29,335
Outside Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 39,853 | 11,418 | 95,987 | 28,176
Other(1) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 21,104 | $ 10,145 | $ 19,674 | $ 22,531

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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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