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Goodwill and Intangible Assets, net | 6 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets, net | 10) Goodwill and Intangible Assets, net 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 |  |  | 6,257 |
Balance as of March 31, 2024 |  | $ | 268,360 |
Intangibles, net The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | March 31, 2024 |  |  | September 30, 2023 |
|  | Gross |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 431,540 |  |  | $ | 366,827 |  |  | $ | 64,713 |  |  | $ | 418,190 |  |  | $ | 358,855 |  |  | $ | 59,335 |
Trade names and other intangibles |  |  | 41,723 |  |  |  | 25,077 |  |  |  | 16,646 |  |  |  | 41,782 |  |  |  | 24,811 |  |  |  | 16,971 |
Total |  | $ | 473,263 |  |  | $ | 391,904 |  |  | $ | 81,359 |  |  | $ | 459,972 |  |  | $ | 383,666 |  |  | $ | 76,306 |
Amortization expense for intangible assets was $9.4 million for the six months ended March 31, 2024, compared to $8.6 million for the six months ended March 31, 2023.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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