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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
--- | --- | ---
Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Jan. 01, 2016 | Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,142,644 | $ 4,156,663 | $ 3,935,028 | $ 2,750,311 | $ 2,653,866 | $ 2,514,751 | $ 2,302,567 | $ 2,551,604 | $ 2,640,587 | $ 2,693,873 | $ 2,781,763 | $ 2,847,934 | $ 14,984,646 | $ 10,022,788 | $ 10,964,157
Total Segment Operating Profit | $ 241,312 | 212,729 | $ 146,286 | 47,644 | $ 106,993 | $ 128,475 | $ 68,173 | 88,628 | 82,811 | 109,556 | 86,781 | 59,450 | 647,971 | 392,269 | 338,598
Restructuring and Other Charges |  | $ (43,900) |  | $ (87,000) |  |  |  | $ (31,700) |  |  |  |  | (170,148) | (134,206) | (187,630)
(Gain) loss on sales of businesses and investments |  |  |  |  |  |  |  |  |  |  |  |  | 20,967 | (10,880) | 41,410
Total Other (Expense) Income, net |  |  |  |  |  |  |  |  |  |  |  |  | (72,299) | (9,932) | (10,465)
Earnings Before Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 554,705 | 393,217 | 286,723
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  | $ 36,000 | $ 25,800 | $ 25,700 | $ 48,100 | 190,806 |  |
CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction Costs |  |  |  |  |  |  |  |  |  |  |  |  | (80,436) | (17,100) | 0
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  |  |  |  |  | 190,806 | 135,438 | 187,907
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Segment Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | 1,012,257 | 625,170 | 586,328
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Corporate Expenses |  |  |  |  |  |  |  |  |  |  |  |  | (113,702) | (81,595) | (60,100)
Corporate | CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  |  |  |  |  | 77,148 | 42,781 | 41,816
Aerospace, Technology, Environmental and Nuclear | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 4,372,008 | 2,464,363 | 2,845,913
Total Segment Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | 311,871 | 200,179 | 215,119
Litigation expenses included in segment profit |  |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |
Aerospace, Technology, Environmental and Nuclear | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  |  |  |  |  | 20,254 | 2,356 | 8,210
Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 6,184,883 | 3,830,697 | 3,419,505
Total Segment Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | 482,277 | 263,679 | 217,412
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,800 |
Buildings, Infrastructure and Advanced Facilities | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  |  |  |  |  | 56,238 | 47,743 | 24,566
Energy, Chemicals and Resources | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 4,427,755 | 3,727,728 | 4,698,739
Total Segment Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | 218,109 | 161,312 | 153,797
Energy, Chemicals and Resources | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges excluded segment profit |  |  |  |  |  |  |  |  |  |  |  |  | 37,166 | 42,558 | 113,315
Other Expense | CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing fees |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800 | $ 1,200 | $ 277

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