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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Changes in the Company's Goodwill | A summary of changes in the Company’s goodwill during the fiscal years ended September 30, 2018 and 2017 are as follows (in thousands):
Balance as of September 30, 2016 |  | $ | 212,760 |
Fiscal year 2017 business combinations |  |  | 13,155 |
Balance as of September 30, 2017 |  |  | 225,915 |
Fiscal year 2018 business combinations |  |  | 2,521 |
Balance as of September 30, 2018 |  | $ | 228,436 |
Intangible Assets Subject to Amortization | Intangible assets subject to amortization consist of the following (in thousands):
|  | September 30, |
|  | 2018 |  |  | 2017 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 358,776 |  |  | $ | 279,990 |  |  | $ | 78,786 |  |  | $ | 346,784 |  |  | $ | 264,632 |  |  | $ | 82,152 |
Trade names and other intangibles |  |  | 32,739 |  |  |  | 13,081 |  |  |  | 19,658 |  |  |  | 32,047 |  |  |  | 8,981 |  |  |  | 23,066 |
Total |  | $ | 391,515 |  |  | $ | 293,071 |  |  | $ | 98,444 |  |  | $ | 378,831 |  |  | $ | 273,613 |  |  | $ | 105,218 |
Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization | Total estimated annual amortization expense related to intangible assets subject to amortization, for the year ended September 30, 2019 and the four succeeding fiscal years ended September 30, is as follows (in thousands):
|  | Amount |
2019 |  | $ | 18,170 |
2020 |  | $ | 16,527 |
2021 |  | $ | 14,020 |
2022 |  | $ | 12,003 |
2023 |  | $ | 10,850 |

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