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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Jan. 01, 2021
Segment Reporting Information [Line Items] |  |
Revenues | $ 3,380,625 | $ 3,381,836
Total Segment Operating Profit | 177,333 | 213,940
Restructuring, Transaction and Other Charges | (83,566) | (22,091)
Total Other (Expense) Income, net | (8,243) | 140,171
Earnings from Continuing Operations Before Taxes | 169,090 | 354,111
Amortization of intangible assets | 46,907 |
Impairment of long-lived assets and equity method investment | 72,266 | 27,902
Worley |  |
Segment Reporting Information [Line Items] |  |
Fair value adjustments |  | 93,100
C3 |  |
Segment Reporting Information [Line Items] |  |
Fair value adjustments |  | 82,600
AWE Management Ltd |  |
Segment Reporting Information [Line Items] |  |
Impairment of long-lived assets and equity method investment |  | 27,900
Gain on termination of lease | 6,900 |
Fair value adjustments | 1,700 |
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total Segment Operating Profit | 366,259 | 306,372
Corporate |  |
Segment Reporting Information [Line Items] |  |
Other Corporate Expenses | (105,360) | (70,341)
Corporate | Other Expense |  |
Segment Reporting Information [Line Items] |  |
Amortization of intangible assets | 46,900 | 23,200
Critical Mission Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,162,505 | 1,295,287
Total Segment Operating Profit | 111,496 | 110,072
People & Places Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,928,146 | 2,086,549
Total Segment Operating Profit | 191,692 | 196,300
PA Consulting | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 289,974 | 0
Total Segment Operating Profit | $ 63,071 | $ 0

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