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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. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,169,622 | $ 2,933,623 | $ 9,345,005 | $ 7,587,916
Total Segment Operating Profit | 89,954 | 162,512 | 305,763 | 226,596
Restructuring and Other Charges | (92,407) | (30,544) | (233,579) | (122,744)
Total Other (Expense) Income, net | 3,445 | (15,879) | (8,344) | (38,016)
Earnings from Continuing Operations Before Taxes | 93,399 | 146,633 | 297,419 | 188,580
Amortization of Intangible Assets |  |  | (56,346) | (58,495)
CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Transaction Costs | (12,738) | (4,420) | (12,738) | (76,915)
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Segment Operating Profit | 259,624 | 232,278 | 737,754 | 557,418
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Corporate Expenses (1) | (64,525) | (34,802) | (185,674) | (131,163)
Corporate | CH2M HILL Companies, Ltd. | Other Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Litigation expenses included in segment profit | 0 |  |  |
Amortization of deferred financing fees | 500 | 500 | 1,500 | 1,200
Aerospace, Technology and Nuclear | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,156,488 | 1,021,523 | 3,251,024 | 2,656,303
Total Segment Operating Profit | 76,306 | 69,085 | 222,289 | 182,609
Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,013,134 | 1,912,100 | 6,093,981 | 4,931,613
Total Segment Operating Profit | 183,318 | 163,193 | 515,465 | 374,809
ECR Business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Transaction Costs | (33,300) |  | (41,900) |
ECR Business | Corporate | Other Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Corporate Expenses (1) | (2,000) | (6,400) | (14,800) | (19,200)
Amortization of Intangible Assets | (18,400) | $ (19,300) | (55,700) | $ (49,100)
ECR Business | Corporate | Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Corporate Expenses (1) | $ (14,100) |  | $ 0 |

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