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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets Excluding Goodwill | Intangible assets consist of the following (in millions):
|  | As of |  | As of
| Weighted Average Amortization Period (Years) | December 31, 2021 |  | October 1, 2021
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships and backlog | 2.3 | 154.6 |  |  | (57.4) |  |  | 97.2 |  |  | 174.3 |  |  | (44.0) |  |  | 130.3 |
Developed technology and other | 9.8 | 987.4 |  |  | (81.2) |  |  | 906.2 |  |  | 1,036.9 |  |  | (88.0) |  |  | 948.9 |
Technology licenses | 2.5 | 61.4 |  |  | (28.1) |  |  | 33.3 |  |  | 48.4 |  |  | (23.9) |  |  | 24.5 |
In-process research and development (“IPR&D”) |  | 594.9 |  |  | — |  |  | 594.9 |  |  | 594.9 |  |  | — |  |  | 594.9 |
Total intangible assets |  | $ | 1,798.3 |  |  | $ | (166.7) |  |  | $ | 1,631.6 |  |  | $ | 1,854.5 |  |  | $ | (155.9) |  |  | $ | 1,698.6 |
Schedule Of Expected Annual Amortization Expense Related To Intangible Assets For The Next Five Years | Annual amortization expense for the next five fiscal years related to definite-lived intangible assets, excluding IPR&D, is expected to be as follows (in millions):
| Remaining 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026 |  | Thereafter
Amortization expense | $ | 191.9 |  |  | $ | 189.0 |  |  | $ | 137.6 |  |  | $ | 117.6 |  |  | $ | 101.9 |  |  | $ | 298.7 |

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