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Restructuring and Other Charges - Summary of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 02, 2020 | Sep. 27, 2019 | Sep. 28, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 324,183 |  |
CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 324,183 | $ 311,332 | $ 190,806
CH2M HILL Companies, Ltd. | Continuing Operations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 324,183 | 311,470 | 153,640
CH2M HILL Companies, Ltd. | Other Expense | Continuing Operations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 321,600 | 337,000 | 154,000
Other miscellaneous adjustments | (500) | 500 | 300
CH2M HILL Companies, Ltd. | Operating Segments | Critical Mission Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 24,083 | 17,989 | 20,254
CH2M HILL Companies, Ltd. | Operating Segments | People & Places Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 170,631 | 108,835 | 56,238
CH2M HILL Companies, Ltd. | Operating Segments | Energy, Chemicals and Resources (included in Discontinued Operations) |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 0 | (138) | 37,166
CH2M HILL Companies, Ltd. | Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 129,469 | $ 184,646 | $ 77,148

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- Definition Amount 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 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: 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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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