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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. 02, 2021 | Jun. 26, 2020 | Jul. 02, 2021 | Jun. 26, 2020
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,576,436 | $ 3,260,057 | $ 10,506,144 | $ 10,047,286
Total Segment Operating Profit | 263,746 | 194,376 | 436,572 | 513,500
Restructuring, Transaction and Other Charges | (1,968) | (20,472) | (345,725) | (115,539)
Total Other (Expense) Income, net | 19,648 | 109,305 | 88,650 | (132,453)
Earnings from Continuing Operations Before Taxes | 283,394 | 303,681 | 525,222 | 381,047
Amortization of intangible assets |  |  | 103,308 |
Impairment of equity method investment and other long term assets |  |  | 40,138 | 0
Worley |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fair value adjustments | 38,700 | 1,000 | 102,200 | 15,200
Foreign currency revaluations |  | (123,100) |  | (119,000)
C3 |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fair value adjustments | (1,000) |  | (49,600) |
AWE Management Ltd |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of equity method investment and other long term assets |  |  | 38,900 |
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Segment Operating Profit | 370,246 | 280,061 | 1,020,495 | 822,187
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Corporate Expenses | (104,532) | (65,213) | (238,198) | (193,148)
Corporate | Other Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Amortization of intangible assets | 49,600 | 23,100 | 103,300 | 67,100
Critical Mission Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,218,089 | 1,211,143 | 3,822,949 | 3,636,978
Total Segment Operating Profit | 108,131 | 89,608 | 332,133 | 264,323
People & Places Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,102,550 | 2,048,914 | 6,329,088 | 6,410,308
Total Segment Operating Profit | 205,324 | 190,453 | 603,654 | 557,864
PA Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
One time charges | (2,800) |  | 297,400 |
PA Consulting | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 255,797 | 0 | 354,107 | 0
Total Segment Operating Profit | $ 56,791 | $ 0 | $ 84,708 | $ 0

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