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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 | 6 Months Ended
--- | --- | ---
Mar. 29, 2019 | Mar. 30, 2018 | Mar. 29, 2019 | Mar. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,091,596 | $ 2,870,295 | $ 6,175,384 | $ 4,654,294
Total Segment Operating Profit | 102,681 | 68,755 | 215,810 | 64,085
Restructuring and Other Charges | (93,938) | (76,473) | (141,171) | (92,200)
Total Other (Expense) Income, net | 9,151 | (20,104) | (11,789) | (22,137)
Earnings from Continuing Operations Before Taxes | 111,832 | 48,651 | 204,021 | 41,948
Amortization of Intangible Assets |  |  | (37,963) | (36,048)
CH2M HILL Companies, Ltd. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Transaction Costs | 0 | (4,852) | 0 | (72,493)
CH2M HILL Companies, Ltd. | Other Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Litigation expenses included in segment profit | 32,400 |  |  |
Amortization of deferred financing fees | 500 | 500 | 1,000 | 700
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Segment Operating Profit | 246,520 | 197,213 | 478,130 | 325,139
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Corporate Expenses (1) | (49,901) | (47,133) | (121,149) | (96,361)
Aerospace, Technology and Nuclear | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,059,508 | 923,905 | 2,094,537 | 1,634,780
Total Segment Operating Profit | 73,831 | 52,458 | 145,982 | 113,524
Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,032,088 | 1,946,390 | 4,080,847 | 3,019,514
Total Segment Operating Profit | 172,689 | 144,755 | 332,148 | 211,615
ECR Business | Corporate | Other Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Corporate Expenses (1) | (6,400) | (6,400) | (12,800) |
Amortization of Intangible Assets | $ (18,700) | $ 18,200 | $ (37,300) | $ (29,800)

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