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Segment Information - Schedule of Total Revenues, Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Jan. 01, 2016 | Oct. 02, 2015 | Jun. 26, 2015 | Mar. 27, 2015 | Dec. 26, 2014 | Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers | $ 2,653,866 | $ 2,514,751 | $ 2,302,567 | $ 2,551,604 | $ 2,640,587 | $ 2,693,873 | $ 2,781,763 | $ 2,847,934 | $ 3,116,954 | $ 2,907,541 | $ 2,903,332 | $ 3,187,005 | $ 10,022,788 | $ 10,964,157 | $ 12,114,832
Total Operating Profit | 106,993 | $ 128,475 | $ 68,173 | 88,628 | $ 82,811 | $ 109,556 | $ 86,781 | $ 59,450 | $ 53,825 | $ 100,434 | $ 133,045 | $ 158,223 | 392,269 | 338,598 | 445,527
Restructuring and Other Charges |  |  |  | $ (31,700) |  |  |  |  |  |  |  |  | (134,206) | (187,630) | (154,283)
Gain (Loss) on disposal of business and investments |  |  |  |  |  |  |  |  |  |  |  |  | 10,880 | (41,410) | (2,909)
Total Other Expense |  |  |  |  |  |  |  |  |  |  |  |  | (9,932) | (10,465) | (12,481)
Earnings Before Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 393,217 | 286,723 | 430,137
CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CH2M Professional Fees and Integration Costs | $ (10,600) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | 625,170 | 586,328 | 615,549
Corporate Non-Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Corporate Items |  |  |  |  |  |  |  |  |  |  |  |  | (81,595) | (60,100) | (15,739)
Segment Reconciling Items | CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CH2M Professional Fees and Integration Costs |  |  |  |  |  |  |  |  |  |  |  |  | (17,100) |  |
Petroleum & Chemicals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers |  |  |  |  |  |  |  |  |  |  |  |  | 2,466,192 | 3,259,499 | 4,214,129
Petroleum & Chemicals | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | 113,858 | 126,604 | 138,351
Aerospace & Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers |  |  |  |  |  |  |  |  |  |  |  |  | 2,360,613 | 2,657,433 | 2,924,753
Aerospace & Technology | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | 202,595 | 203,808 | 205,368
Buildings & Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers |  |  |  |  |  |  |  |  |  |  |  |  | 2,452,321 | 2,253,512 | 2,458,379
Restructuring and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  | (23,844) |  |
Buildings & Infrastructure | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | 193,455 | 174,648 | 145,299
Industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers |  |  |  |  |  |  |  |  |  |  |  |  | 2,743,662 | 2,793,713 | 2,517,571
Industrial | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Profit |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,262 | $ 81,268 | $ 126,531

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