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Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Oct. 01, 2021 | Oct. 02, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment of real estate |  | $ 71,000 | $ 2,400 | $ 161,400
Gain on termination of lease |  | 8,700 |  |
Impairment of equity method investment |  |  |  | (162,000)
AWE ML |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain on termination of lease |  | 8,700 |  |
Impairment of equity method investment |  |  | (38,500) |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 161,063 | 99,590 | 324,183
Impairment of real estate | $ 78,300 |  | 2,400 | 161,400
Gain on termination of lease |  | (8,700) |  |
Impairment of equity method investment |  | (91,300) |  |
CH2M HILL Companies, Ltd. | Lease Abandonments and Impairments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 69,802 | 4,282 | 151,150
CH2M HILL Companies, Ltd. | Voluntary and Involuntary Terminations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 5,635 | 15,773 | 53,484
CH2M HILL Companies, Ltd. | Outside Services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 22,340 | 35,210 | 88,476
CH2M HILL Companies, Ltd. | Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | $ 63,286 | $ 44,325 | $ 31,073

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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 https://asc.fasb.org/extlink&oid=126903467&loc=d3e32787-111569 + Details
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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 40 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123386189&loc=SL77918607-209975 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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