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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 | 9 Months Ended
--- | --- | ---
Jul. 01, 2022 | Apr. 01, 2022 | Jul. 02, 2021 | Jul. 01, 2022 | Jul. 02, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 3,827,093 |  | $ 3,576,436 | $ 11,041,777 | $ 10,506,144
Total Segment Operating Profit | 265,762 |  | 263,746 | 609,310 | 436,572
Restructuring, Transaction and Other Charges | (10,150) |  | (1,968) | (210,986) | (345,725)
Total Other (Expense) Income, net | 6,353 |  | 19,648 | (12,825) | 88,650
Earnings from Continuing Operations Before Taxes | 272,115 |  | 283,394 | 596,485 | 525,222
Amortization of intangible assets |  |  |  | 146,889 |
Other transformation and other charges |  |  |  | 24,500 |
Impairment of long-lived assets and equity method investment |  |  |  | 74,585 | 40,138
Gain on investment in equity securities |  |  |  | 13,862 | 152,145
Disposal of investment in equity securities | (13,900) |  |  | (13,862) | (52,021)
JKC Australia LNG Pty Limited | Settled Litigation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss related to settlement |  | $ 91,300 |  | 91,300 |
Worley |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investments |  |  | 38,700 |  | 102,200
C3 |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investments |  |  | 1,000 |  | 49,600
AWE Management Ltd |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment of long-lived assets and equity method investment |  |  | 38,900 |  | 38,900
Gain on termination of lease |  |  |  | 7,100 |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Segment Operating Profit | 365,799 |  | 370,246 | 1,104,775 | 1,020,495
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Corporate Expenses | (89,887) |  | (104,532) | (284,479) | (238,198)
Corporate | Other Expense |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Amortization of intangible assets | 51,600 |  | 49,600 | 146,900 | 103,300
Critical Mission Solutions | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 1,317,109 |  | 1,218,089 | 3,845,927 | 3,822,949
Total Segment Operating Profit | 104,305 |  | 108,131 | 329,042 | 332,133
People & Places Solutions | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 2,232,404 |  | 2,102,550 | 6,330,906 | 6,329,088
Total Segment Operating Profit | 210,046 |  | 205,324 | 592,883 | 603,654
PA Consulting |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
One time charges |  |  |  |  | 297,400
PA Consulting | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 277,580 |  | 255,797 | 864,944 | 354,107
Total Segment Operating Profit | $ 51,448 |  | $ 56,791 | $ 182,850 | $ 84,708

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