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Goodwill and Intangible Assets, net (Tables) | 6 Months Ended
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Mar. 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, 2022 |  | $ | 254,110 |
Fiscal year 2023 business combinations |  |  | 244 |
Balance as of March 31, 2023 |  | $ | 254,354 |
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, 2023 |  |  | September 30, 2022 |
|  | Gross |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 409,679 |  |  | $ | 351,123 |  |  | $ | 58,556 |  |  | $ | 409,980 |  |  | $ | 345,237 |  |  | $ | 64,743 |
Trade names and other intangibles |  |  | 41,515 |  |  |  | 22,533 |  |  |  | 18,982 |  |  |  | 41,736 |  |  |  | 21,969 |  |  |  | 19,767 |
Total |  | $ | 451,194 |  |  | $ | 373,656 |  |  | $ | 77,538 |  |  | $ | 451,716 |  |  | $ | 367,206 |  |  | $ | 84,510 |

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