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Goodwill and Intangibles (Tables) | 12 Months Ended
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Sep. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets | As a result of the segment realignment this year, see Note 17- Segment Information, the historical carrying value of goodwill has been allocated to the three remaining reportable segments to present balances on a comparable basis. The roll-forward of goodwill by LOB appearing in the accompanying Consolidated Balance Sheets for the year ended September 28, 2018 was as follows (in millions):
| Aerospace, Technology, Environmental and Nuclear |  | Buildings, Infrastructure and Advanced Facilities |  | Energy, Chemicals and Resources |  | Total
Balance September 29, 2017 | $ | 1,038 |  |  | $ | 1,049 |  |  | $ | 923 |  |  | $ | 3,010 |
Acquired | 1,147 |  |  | 1,585 |  |  | 397 |  |  | 3,129 |
Post-Acquisition Adjustments relating to prior year acquisition | 4 |  |  | — |  |  | — |  |  | 4 |
Foreign Exchange Impact | (13 | ) |  | (14 | ) |  | (12 | ) |  | (39 | )
Balance September 28, 2018 | $ | 2,176 |  |  | $ | 2,620 |  |  | $ | 1,308 |  |  | $ | 6,104 |
Schedule of Acquired Intangibles in Accompanying Consolidated Balance Sheets | The following table provides a roll-forward of the Company’s acquired intangibles in the accompanying Consolidated Balance Sheets for the years ended September 28, 2018 and September 29, 2017 (in thousands):
| Customer Relationships, Contracts and Backlog |  | Developed Technology |  | Trade Names |  | Patents |  | Lease Intangible Assets |  | Other |  | Total
Balances, September 30, 2016 | 307,637 |  |  | 14,311 |  |  | 4,786 |  |  | 10,027 |  |  | — |  |  | 161 |  |  | 336,922 |
Acquisitions | 29,803 |  |  | 1,685 |  |  | 4,417 |  |  | — |  |  |  |  | — |  |  | 35,905 |
Amortization | (39,679 | ) |  | (1,534 | ) |  | (2,549 | ) |  | (400 | ) |  |  |  | (50 | ) |  | (44,212 | )
Foreign currency translation | 3,707 |  |  | — |  |  | 45 |  |  | 553 |  |  |  |  | — |  |  | 4,305 |
Balances, September 29, 2017 | 301,468 |  |  | 14,462 |  |  | 6,699 |  |  | 10,180 |  |  | — |  |  | 111 |  |  | 332,920 |
Acquisitions | 412,300 |  |  | 237 |  |  | — |  |  | — |  |  | 4,415 |  |  | — |  |  | 416,952 |
Post-Acquisition Adjustments relating to prior year acquisition | 200 |  |  | (1,921 | ) |  | (1,700 | ) |  | — |  |  | — |  |  | — |  |  | (3,421 | )
Amortization | (75,375 | ) |  | (1,533 | ) |  | (2,738 | ) |  | (410 | ) |  | (625 | ) |  | (50 | ) |  | (80,731 | )
Foreign currency translation | (9,150 | ) |  | — |  |  | (159 | ) |  | (454 | ) |  | — |  |  | — |  |  | (9,763 | )
Balances, September 28, 2018 | 629,443 |  |  | 11,245 |  |  | 2,102 |  |  | 9,316 |  |  | 3,790 |  |  | 61 |  |  | 655,957 |
Weighted Average Amortization Period (years) | 9 |  |  | 8 |  |  | 8 |  |  | 24 |  |  | 8 |  |  | 2 |  |  | 9 |
Schedule of Estimated Amortization Expense of Intangible Assets | The following table presents estimated amortization expense of intangible assets for fiscal 2019 and for the succeeding years. The amounts below include preliminary amortization estimates for the CH2M opening balance sheet fair values that are still preliminary and are subject to change.
Fiscal Year | (in millions)
2019 | $ | 86.1 |
2020 | 83.0 |
2021 | 79.4 |
2022 | 78.2 |
2023 | 77.6 |
Thereafter | 242.9 |
Total | $ | 647.2 |

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