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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
--- | ---
Dec. 27, 2019 | Dec. 28, 2018
Segment Reporting Information [Line Items] |  |
Revenues | $ 3,360,049 | $ 3,083,788
Total Segment Operating Profit | 151,345 | 113,130
Restructuring and Other Charges | (49,663) | (47,234)
Total Other (Expense) Income, net | 102,824 | (20,939)
Earnings from Continuing Operations Before Taxes | 254,169 | 92,191
Other expense |  | 6,400
Revenue from Related Parties | 12,000 | 99,100
Interest expense | 14,817 | 25,325
CH2M HILL Companies, Ltd. |  |
Segment Reporting Information [Line Items] |  |
Transaction Costs | (1,023) | 0
CH2M HILL Companies, Ltd. | Other Expense |  |
Segment Reporting Information [Line Items] |  |
Amortization of deferred financing fees |  | 500
Interest expense |  | 25,300
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total Segment Operating Profit | 268,750 | 231,611
Corporate |  |
Segment Reporting Information [Line Items] |  |
Other expenses | (66,719) | (71,247)
Corporate | CH2M HILL Companies, Ltd. | Other Expense |  |
Segment Reporting Information [Line Items] |  |
Amortization of deferred financing fees | 600 |
Gain (loss) related to settlement | 2,200 |
Corporate | CH2M HILL Companies, Ltd. | Other Expense | Pension Plan |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) related to settlement | 2,400 |
Aerospace, Technology and Nuclear | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,182,457 | 1,035,028
Total Segment Operating Profit | 90,422 | 72,152
Buildings, Infrastructure and Advanced Facilities | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 2,177,592 | 2,048,760
Total Segment Operating Profit | 178,328 | 159,459
ECR Business | Corporate | Other Expense |  |
Segment Reporting Information [Line Items] |  |
Amortization of Intangible Assets | $ (21,800) | $ (18,700)

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