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Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Amortization Expense of Intangible Assets | Amortization expense related to intangible assets is as follows (in thousands):
| Three Months Ended |  |
| December 31, 2021 |  | January 1, 2021 |  |  |  |
Cost of revenue | $ | 2,505 |  |  | $ | 3,877 |  |  |  |  |
Selling, general and administrative | 6,782 |  |  | 8,116 |  |  |  |  |
Total | $ | 9,287 |  |  | $ | 11,993 |  |  |  |  |
Summary of Intangible Assets | Intangible assets consist of the following (in thousands):
| December 31, 2021 |  | October 1, 2021
Acquired technology | $ | 179,434 |  |  | $ | 179,434 |
Customer relationships | 245,870 |  |  | 245,870 |
Trade name (indefinite-lived) | 3,400 |  |  | 3,400 |
Total | 428,704 |  |  | 428,704 |
Less accumulated amortization | (353,306) |  |  | (344,019) |
Intangible assets — net | $ | 75,398 |  |  | $ | 84,685 |
Summary of Activity in Intangible Assets and Goodwill | A summary of the activity in gross intangible assets and goodwill is as follows (in thousands):
| Intangible Assets |  |
| Total Intangible Assets |  | Acquired Technology |  | Customer Relationships |  | Trade Name |  | Goodwill
Balance as of October 1, 2021 | $ | 428,704 |  |  | $ | 179,434 |  |  | $ | 245,870 |  |  | $ | 3,400 |  |  | $ | 314,240 |
Currency translation adjustment | — |  |  | — |  |  | — |  |  | — |  |  | (342) |
Balance as of December 31, 2021 | $ | 428,704 |  |  | $ | 179,434 |  |  | $ | 245,870 |  |  | $ | 3,400 |  |  | $ | 313,898 |
Summary of Estimated Amortization of Intangible Assets in Future Fiscal Years | As of December 31, 2021, our estimated amortization of our intangible assets in future fiscal years was as follows (in thousands):
| 2022 Remaining | 2023 | 2024 | 2025 | 2026 | Thereafter | Total
Amortization expense | $ | 24,146 |  | 26,048 |  | 15,410 |  | 3,490 |  | 1,644 |  | 1,260 |  | $ | 71,998 |

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