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Goodwill and Other Intangible Assets | 12 Months Ended
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Sep. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | 11) Goodwill and Other Intangible Assets Goodwill A summary of changes in the Company’s goodwill during the fiscal years ended September 30, 2020 and 2019 are as follows (in thousands):
Balance as of September 30, 2018 |  | $ | 228,436 |
Fiscal year 2019 business combinations |  |  | 16,138 |
Balance as of September 30, 2019 |  |  | 244,574 |
Fiscal year 2020 business combinations |  | 184 |
Goodwill included within assets held for sale |  |  | (4,431 | )
Balance as of September 30, 2020 |  | $ | 240,327 |
Intangibles, net Intangible assets subject to amortization consist of the following (in thousands):
|  | September 30, |
|  | 2020 |  |  | 2019 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 382,942 |  |  | $ | 312,928 |  |  | $ | 70,014 |  |  | $ | 382,373 |  |  | $ | 297,221 |  |  | $ | 85,152 |
Trade names and other intangibles |  |  | 37,382 |  |  |  | 17,103 |  |  |  | 20,279 |  |  |  | 37,739 |  |  |  | 15,203 |  |  |  | 22,536 |
Total |  | $ | 420,324 |  |  | $ | 330,031 |  |  | $ | 90,293 |  |  | $ | 420,112 |  |  | $ | 312,424 |  |  | $ | 107,688 |
Amortization expense for intangible assets was $19.6 million, $19.4 million, and $19.6 million, for the fiscal years ended September 30, 2020, 2019, and 2018, respectively. Total estimated annual amortization expense related to intangible assets subject to amortization, for the year ended September 30, 2021 and the four succeeding fiscal years ended September 30, is as follows (in thousands):
|  | Amount |
2021 |  | $ | 17,376 |
2022 |  | $ | 15,318 |
2023 |  | $ | 13,705 |
2024 |  | $ | 11,351 |
2025 |  | $ | 9,076 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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