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Goodwill and Intangible Assets, net (Tables) | 3 Months Ended
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Dec. 31, 2023
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, 2023 |  | $ | 262,103 |
Fiscal year 2024 business combinations |  |  | 244 |
Balance as of December 31, 2023 |  | $ | 262,347 |
Intangible Assets Subject to Amortization | The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | December 31, 2023 |  |  | September 30, 2023 |
|  | Gross |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 420,460 |  |  | $ | 362,914 |  |  | $ | 57,546 |  |  | $ | 418,190 |  |  | $ | 358,855 |  |  | $ | 59,335 |
Trade names and other intangibles |  |  | 42,197 |  |  |  | 25,774 |  |  |  | 16,423 |  |  |  | 41,782 |  |  |  | 24,811 |  |  |  | 16,971 |
Total |  | $ | 462,657 |  |  | $ | 388,688 |  |  | $ | 73,969 |  |  | $ | 459,972 |  |  | $ | 383,666 |  |  | $ | 76,306 |

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