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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 | 12 Months Ended
--- | --- | ---
Oct. 02, 2020 | Jun. 26, 2020 | Mar. 27, 2020 | Dec. 27, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018 | Oct. 02, 2020 | Sep. 27, 2019 | Sep. 28, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Segment Operating Profit | $ 22,474 | $ 194,376 | $ 167,778 | $ 151,345 | $ 99,086 | $ 89,954 | $ 102,681 | $ 113,130 | $ 535,973 | $ 404,851 | $ 387,443
Restructuring, Transaction and Other Charges |  |  |  |  |  |  |  |  | (327,413) | (355,235) | (234,387)
Total Other (Expense) Income, net |  |  |  |  |  |  |  |  | (94,770) | (53,892) | (56,462)
Earnings from Continuing Operations Before Taxes | $ 60,158 | $ 303,681 | $ (176,805) | $ 254,169 | $ 53,537 | $ 93,399 | $ 111,832 | $ 92,191 | 441,203 | 350,959 | 330,981
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  | 324,183 |  |
Other expense income |  |  |  |  |  |  |  |  |  | 14,800 | 25,600
Intangibles amortization |  |  |  |  |  |  |  |  | 90,600 | 79,100 | 68,100
U.S. Plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on litigation settlement |  |  |  |  |  |  |  |  | (2,700) |  |
ECR Business |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing fees |  |  |  |  |  |  |  |  | 74,300 | 64,800 |
CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  | 324,183 | 311,332 | 190,806
Amortization of deferred financing fees |  |  |  |  |  |  |  |  | 700 | 3,200 | 1,800
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Segment Operating Profit |  |  |  |  |  |  |  |  | 1,112,777 | 1,024,437 | 783,618
Corporate Non Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Corporate Expenses |  |  |  |  |  |  |  |  | (249,391) | (264,351) | (161,788)
Corporate Non Segment | CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  | 129,469 | 184,646 | 77,148
Critical Mission Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Segment Operating Profit |  |  |  |  |  |  |  |  | 372,070 | 310,043 | 255,718
Litigation expenses included in segment profit |  |  |  |  |  |  |  |  |  |  | 15,000
People & Places Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Segment Operating Profit |  |  |  |  |  |  |  |  | 740,707 | 714,394 | $ 527,900
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  |  | 25,000 |
Other Expense | ECR Business |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
TSA related income |  |  |  |  |  |  |  |  | $ 15,800 | $ 35,400 |

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