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Goodwill and Intangibles (Tables) | 12 Months Ended
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Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets | The carrying value of goodwill associated with continuing operations and appearing in the accompanying Consolidated Balance Sheets September 30, 2022 and October 1, 2021 was as follows (in thousands):
| Critical Mission Solutions |  | People & Places Solutions |  | PA Consulting |  | Total
Balance October 1, 2021 | $ | 2,550,631 |  |  | $ | 3,240,783 |  |  | $ | 1,405,586 |  |  | $ | 7,197,000 |
Acquired | 195,756 |  |  | 116,525 |  |  | 17,245 |  |  | 329,526 |
Post-Acquisition Adjustments | — |  |  | — |  |  | 5,720 |  |  | 5,720 |
Foreign currency translation and other | (30,194) |  |  | (47,995) |  |  | (269,399) |  |  | (347,588) |
Balance September 30, 2022 | $ | 2,716,193 |  |  | $ | 3,309,313 |  |  | $ | 1,159,152 |  |  | $ | 7,184,658 |
Schedule of Acquired Intangibles in Accompanying Consolidated Balance Sheets | The following table provides certain information related to the Company’s acquired intangibles in the accompanying Consolidated Balance Sheets for the year ended September 30, 2022 (in thousands):
| Customer Relationships, Contracts and Backlog |  | Developed Technology |  | Trade Names |  |  |  | Total
Balances, October 1, 2021 | $ | 1,309,061 |  |  | $ | 40,020 |  |  | $ | 216,677 |  |  |  |  | $ | 1,565,758 |
Acquired | 101,527 |  |  | 62,000 |  |  | 392 |  |  |  |  | 163,919 |
Amortization | (175,592) |  |  | (12,055) |  |  | (10,955) |  |  |  |  | (198,602) |
Foreign currency translation and other | (98,558) |  |  | (1,034) |  |  | (37,431) |  |  |  |  | (137,023) |
Balances, September 30, 2022 | $ | 1,136,438 |  |  | $ | 88,931 |  |  | $ | 168,683 |  |  |  |  | $ | 1,394,052 |
Weighted Average Amortization Period (years) | 7 |  | 7 |  | 18 |  |  |  | 9
Schedule of Estimated Amortization Expense of Intangible Assets | The following table presents estimated amortization expense of intangible assets for fiscal 2023 and for the succeeding years. The amounts below include preliminary amortization estimates for the StreetLight opening balance sheet fair values that are still preliminary and are subject to change.
Fiscal Year |  | (in millions)
2023 |  | $ | 194.8 |
2024 |  | 194.4 |
2025 |  | 194.0 |
2026 |  | 171.3 |
2027 |  | 140.1 |
Thereafter |  | 499.5 |
Total |  | $ | 1,394.1 |

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