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Goodwill and Intangible Assets, net (Tables) | 6 Months Ended
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Mar. 31, 2021
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, 2020 |  | $ | 240,327 |
Fiscal year 2021 business combinations |  |  | 12,872 |
Balance as of March 31, 2021 |  | $ | 253,199 |
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, 2021 |  |  | September 30, 2020 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 401,630 |  |  | $ | 320,809 |  |  | $ | 80,821 |  |  | $ | 382,942 |  |  | $ | 312,928 |  |  | $ | 70,014 |
Trade names and other intangibles |  |  | 39,977 |  |  |  | 18,319 |  |  |  | 21,658 |  |  |  | 37,382 |  |  |  | 17,103 |  |  |  | 20,279 |
Total |  | $ | 441,607 |  |  | $ | 339,128 |  |  | $ | 102,479 |  |  | $ | 420,324 |  |  | $ | 330,031 |  |  | $ | 90,293 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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