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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 30, 2018 | Mar. 31, 2017 | Mar. 30, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | $ 3,935,028,000 | $ 2,302,567,000 | $ 6,685,338,000 | $ 4,854,171,000
Total Segment Operating Profit | 146,286,000 | 68,173,000 | 193,929,000 | 156,801,000
Restructuring and Other Charges | (68,885,000) | (72,225,000) | (88,234,000) | (103,966,000)
Total Other (Expense) Income, net | (24,119,000) | (7,682,000) | (29,846,000) | (10,430,000)
Earnings Before Taxes | 122,167,000 | 60,491,000 | 164,083,000 | 146,371,000
Restructuring charges excluded segment profit |  |  | 88,701,000 |
CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
CH2M Transaction Costs | (4,852,000) | 0 | (72,493,000) | 0
Restructuring charges excluded segment profit | 69,351,000 | 52,266,000 | 88,701,000 | 84,007,000
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Segment Operating Profit | 255,683,000 | 148,736,000 | 432,445,000 | 287,401,000
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Corporate Expenses | (35,660,000) | (8,338,000) | (77,789,000) | (26,634,000)
Corporate | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges excluded segment profit | 57,243,000 | 20,362,000 | 69,768,000 | 27,917,000
Aerospace, Technology, Environmental and Nuclear |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,105,673,000 | 602,043,000 | 1,851,594,000 | 1,205,228,000
Aerospace, Technology, Environmental and Nuclear | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,105,673,000 | 602,043,000 | 1,851,594,000 | 1,205,228,000
Total Segment Operating Profit | 61,338,000 | 44,341,000 | 127,669,000 | 94,397,000
Litigation expenses included in segment profit | 17,300,000 |  | 17,300,000 |
Aerospace, Technology, Environmental and Nuclear | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges excluded segment profit | 1,409,000 | 1,274,000 | 1,722,000 | 1,646,000
Buildings, Infrastructure and Advanced Facilities |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,758,412,000 | 897,829,000 | 2,790,177,000 | 1,836,723,000
Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,758,412,000 | 897,829,000 | 2,790,177,000 | 1,836,723,000
Total Segment Operating Profit | 138,017,000 | 63,342,000 | 201,986,000 | 118,690,000
Restructuring charges excluded segment profit | 22,600,000 |  | 22,600,000 |
Buildings, Infrastructure and Advanced Facilities | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges excluded segment profit | 18,287,000 | 9,996,000 | 21,178,000 | 18,002,000
Energy, Chemicals and Resources |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,070,943,000 | 802,695,000 | 2,043,567,000 | 1,812,220,000
Energy, Chemicals and Resources | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from External Customers | 1,070,943,000 | 802,695,000 | 2,043,567,000 | 1,812,220,000
Total Segment Operating Profit | 56,328,000 | 41,053,000 | 102,790,000 | 74,314,000
Energy, Chemicals and Resources | Operating Segments | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges excluded segment profit | (7,588,000) | $ 20,634,000 | (3,967,000) | $ 36,442,000
Other Expense | CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Amortization of deferred financing fees | $ 466,000 |  | $ 722,000 |

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