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Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 01, 2021 | Oct. 02, 2020 | Sep. 27, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Gain on litigation settlement | $ 19,500 |  |
AWE ML |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment of equity method investment | (38,500) |  |
CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 99,590 | $ 324,183 | $ 311,470
CH2M HILL Companies, Ltd. | Lease Abandonments and Impairments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 4,282 | 151,150 | 99,976
CH2M HILL Companies, Ltd. | Voluntary and Involuntary Terminations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 15,773 | 53,484 | 33,742
CH2M HILL Companies, Ltd. | Outside Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 35,210 | 88,476 | 133,148
CH2M HILL Companies, Ltd. | Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 44,325 | $ 31,073 | 44,604
CH2M HILL Companies, Ltd. | Other | Other Expense |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain on litigation settlement | $ (2,100) |  | $ 35,000

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=124268079&loc=d3e32787-111569 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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