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Intangible Assets, Goodwill, Acquisitions, and Divestitures (Tables) | 6 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | Intangible assets, net, as of March 31, 2024 and September 30, 2023 consisted of the following:
|  |  |  | March 31, 2024 |  |  | September 30, 2023 |
|  | Estimated Useful Life |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Customer relationships |  | 6-21 yrs. |  | $ | 715.9 |  |  | $ | (603.2 | ) |  | $ | 725.5 |  |  | $ | (594.1 | )
Trademarks |  | 12 yrs. |  |  | — |  |  |  | — |  |  |  | 3.8 |  |  |  | (2.9 | )
Non-compete agreements |  | 5 yrs. |  |  | — |  |  |  | — |  |  |  | 2.7 |  |  |  | (2.7 | )
Total intangible assets |  |  |  | $ | 715.9 |  |  | $ | (603.2 | ) |  | $ | 732.0 |  |  | $ | (599.7 | )
Summary of Goodwill | The following is a summary of the goodwill activity for the periods ended September 30, 2023 and March 31, 2024:
|  | Maintenance Services |  |  | Development Services |  |  | Total |
Balance, September 30, 2022 |  | $ | 1,792.7 |  |  | $ | 216.1 |  |  | $ | 2,008.8 |
Acquisitions (1) |  |  | 10.7 |  |  |  | 1.9 |  |  |  | 12.6 |
Balance, September 30, 2023 |  | $ | 1,803.4 |  |  | $ | 218.0 |  |  | $ | 2,021.4 |
Acquisitions (1) |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |
Divestiture |  |  | (5.8 | ) |  |  | — |  |  |  | (5.8 | )
Balance, March 31, 2024 |  | $ | 1,797.7 |  |  | $ | 218.0 |  |  | $ | 2,015.7 |
(1) The acquisitions adjustment includes the immaterial impact of foreign currency adjustments during the period.

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