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Goodwill and Intangibles, net (Tables) | 9 Months Ended
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Jun. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Changes in the Company's Goodwill | A summary of changes in the Company’s goodwill is as follows (in thousands):
Balance as of September 30, 2018 |  | $ | 228,436 |
Fiscal year 2019 business combinations |  |  | 18,905 |
Balance as of June 30, 2019 |  | $ | 247,341 |
Intangible Assets Subject to Amortization | The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | June 30, 2019 |  |  | September 30, 2018 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 381,890 |  |  | $ | 292,522 |  |  | $ | 89,368 |  |  | $ | 358,776 |  |  | $ | 279,990 |  |  | $ | 78,786 |
Trade names and other intangibles |  |  | 35,577 |  |  |  | 14,623 |  |  |  | 20,954 |  |  |  | 32,739 |  |  |  | 13,081 |  |  |  | 19,658 |
Total |  | $ | 417,467 |  |  | $ | 307,145 |  |  | $ | 110,322 |  |  | $ | 391,515 |  |  | $ | 293,071 |  |  | $ | 98,444 |

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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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