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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
--- | --- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | $ 4,156,663 | $ 2,514,751 | $ 10,842,001 | $ 7,368,922
Total Segment Operating Profit | 212,729 | 128,475 | 406,659 | 285,276
Restructuring and Other Charges | (46,922) | (10,700) | (135,156) | (114,666)
Total Other (Expense) Income, net | (19,946) | (1,079) | (49,792) | (11,509)
Earnings Before Taxes | 192,783 | 127,396 | 356,867 | 273,767
Restructuring charges excluded segment profit |  |  | 135,156 |
CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
CH2M Transaction Costs | (4,422) | 0 | (76,915) | 0
Restructuring charges excluded segment profit | 46,456 | 10,700 | 135,156 | 115,899
CH2M HILL Companies, Ltd. | Other Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring and Other Charges |  |  |  | (1,200)
Amortization of deferred financing fees | 500 |  | 1,200 |
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Segment Operating Profit | 297,204 | 168,166 | 729,649 | 455,567
Corporate (1) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Corporate Expenses (3) | (33,131) | (28,991) | (110,919) | (55,625)
Other corporate charges associated with a certain project | (15,000) |  |  |
Corporate (1) | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges excluded segment profit | (19,282) | 2,866 | 50,486 | 30,784
Aerospace, Technology, Environmental and Nuclear |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,221,306 | 610,643 | 3,072,900 | 1,815,871
Aerospace, Technology, Environmental and Nuclear | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,221,306 | 610,643 | 3,072,900 | 1,815,871
Total Segment Operating Profit | 89,334 | 49,383 | 217,003 | 143,781
Litigation expenses included in segment profit | 15,000 |  | 15,000 |
Aerospace, Technology, Environmental and Nuclear | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges excluded segment profit | 16,936 | (18) | 18,655 | 1,628
Buildings, Infrastructure and Advanced Facilities |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,707,072 | 987,159 | 4,497,249 | 2,823,882
Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,707,072 | 987,159 | 4,497,249 | 2,823,882
Total Segment Operating Profit | 145,901 | 72,991 | 347,887 | 191,680
Restructuring charges excluded segment profit | 22,600 |  | 22,600 |
Buildings, Infrastructure and Advanced Facilities | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges excluded segment profit | 32,423 | 8,504 | 53,603 | 47,697
Energy, Chemicals and Resources |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,228,285 | 916,949 | 3,271,852 | 2,729,169
Energy, Chemicals and Resources | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,228,285 | 916,949 | 3,271,852 | 2,729,169
Total Segment Operating Profit | 61,969 | 45,792 | 164,759 | 120,106
Energy, Chemicals and Resources | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges excluded segment profit | $ 16,379 | $ (652) | $ 12,412 | $ 35,790

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