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Goodwill and Intangible Assets, net (Tables) | 3 Months Ended
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Dec. 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, 2021 |  | $ | 253,398 |
Fiscal year 2022 business combinations |  |  | 800 |
Balance as of December 31, 2021 |  | $ | 254,198 |
Intangible Assets Subject to Amortization | The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | December 31, 2021 |  |  | September 30, 2021 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 405,541 |  |  | $ | 333,555 |  |  | $ | 71,986 |  |  | $ | 403,913 |  |  | $ | 329,406 |  |  | $ | 74,507 |
Trade names and other intangibles |  |  | 41,010 |  |  |  | 20,219 |  |  |  | 20,791 |  |  |  | 40,548 |  |  |  | 19,581 |  |  |  | 20,967 |
Total |  | $ | 446,551 |  |  | $ | 353,774 |  |  | $ | 92,777 |  |  | $ | 444,461 |  |  | $ | 348,987 |  |  | $ | 95,474 |

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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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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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