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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 | 3 Months Ended
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Dec. 31, 2021 | Jan. 01, 2021
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ (1,594) |
Impairment of long-lived assets and equity method investment | 72,266 | $ 27,902
AWE Management Ltd |  |
Restructuring Cost and Reserve [Line Items] |  |
Impairment of long-lived assets and equity method investment |  | 27,900
Gain on termination of lease | 6,900 |
CH2M HILL Companies, Ltd. |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 69,359 | 48,393
CH2M HILL Companies, Ltd. | Continuing Operations | Other Expense |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 77,900 | 20,500
CH2M HILL Companies, Ltd. | Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 6,838 | 40,017
CH2M HILL Companies, Ltd. | Critical Mission Solutions | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 1,153 | 3,209
CH2M HILL Companies, Ltd. | People & Places Solutions | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 61,169 | 5,167
CH2M HILL Companies, Ltd. | PA Consulting | Operating Segments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 199 | $ 0

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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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