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Goodwill and Intangible Assets, net (Tables) | 6 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Changes in Company's Goodwill | A summary of changes in Company’s goodwill is as follows (in thousands):
Balance as of September 30, 2024 |  | $ | 275,829 |
Fiscal year 2025 business combinations |  |  | 16,822 |
Other |  |  | (194 | )
Balance as of March 31, 2025 |  | $ | 292,457 |
Intangible Assets Subject to Amortization | The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | March 31, 2025 |  |  | September 30, 2024 |
|  | Gross |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 481,077 |  |  | $ | 382,372 |  |  | $ | 98,705 |  |  | $ | 452,340 |  |  | $ | 373,860 |  |  | $ | 78,480 |
Trade names and other intangibles |  |  | 55,636 |  |  |  | 27,763 |  |  |  | 27,873 |  |  |  | 46,895 |  |  |  | 26,663 |  |  |  | 20,232 |
Total |  | $ | 536,713 |  |  | $ | 410,135 |  |  | $ | 126,578 |  |  | $ | 499,235 |  |  | $ | 400,523 |  |  | $ | 98,712 |

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