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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Oct. 01, 2021 | Oct. 02, 2020 | Sep. 27, 2019
Segment Reporting Information [Line Items] |  |  |
Total Segment Operating Profit | $ 688,089 | $ 535,973 | $ 404,851
Restructuring, Transaction and Other Charges | (350,394) | (327,413) | (355,235)
Total Other (Expense) Income, net | 7,513 | (94,770) | (53,892)
Earnings from Continuing Operations Before Taxes | 695,602 | 441,203 | 350,959
Gain (loss) on litigation settlement | 19,500 |  |
Restructuring charges excluded segment profit | 99,590 |  |
Intangibles amortization | 149,800 | 90,600 | 79,100
Other expense income |  |  | 14,800
AWE ML |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairment of equity method investment | (38,500) |  |
C3.ai. Inc. |  |  |
Segment Reporting Information [Line Items] |  |  |
Fair value adjustments | (49,600) |  |
ECR Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Fair value adjustments | 34,700 | (74,300) | (64,800)
CH2M HILL Companies, Ltd. |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges excluded segment profit | 99,590 | 324,183 | 311,332
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Operating Profit | 1,378,612 | 1,112,777 | 1,024,437
Corporate Non Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Other Corporate Expenses | (340,129) | (249,391) | (264,351)
Corporate Non Segment | CH2M HILL Companies, Ltd. |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges excluded segment profit | 71,868 | 129,469 | 184,646
Critical Mission Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Operating Profit | 447,161 | 372,070 | 310,043
People & Places Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Operating Profit | 780,380 | 740,707 | 714,394
Restructuring charges excluded segment profit |  |  | 25,000
PA Consulting |  |  |
Segment Reporting Information [Line Items] |  |  |
One time charges | 297,800 |  |
PA Consulting | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Operating Profit | 151,071 | 0 | 0
PA Consulting | Operating Segments | CH2M HILL Companies, Ltd. |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges excluded segment profit | 15,566 | 0 | 0
Other Expense | ECR Business |  |  |
Segment Reporting Information [Line Items] |  |  |
TSA related income | 200 | $ 15,800 | 35,400
Other Expense | CH2M HILL Companies, Ltd. | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain (loss) on litigation settlement | $ (2,100) |  | $ 35,000

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