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Goodwill and Intangible Assets, net | 9 Months Ended
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Jun. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets, net | 10) Goodwill and Intangible Assets, net 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 |  |  | 12,971 |
Balance as of June 30, 2021 |  | $ | 253,298 |
Intangibles, net The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | June 30, 2021 |  |  | September 30, 2020 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 403,913 |  |  | $ | 325,079 |  |  | $ | 78,834 |  |  | $ | 382,942 |  |  | $ | 312,928 |  |  | $ | 70,014 |
Trade names and other intangibles |  |  | 40,548 |  |  |  | 18,948 |  |  |  | 21,600 |  |  |  | 37,382 |  |  |  | 17,103 |  |  |  | 20,279 |
Total |  | $ | 444,461 |  |  | $ | 344,027 |  |  | $ | 100,434 |  |  | $ | 420,324 |  |  | $ | 330,031 |  |  | $ | 90,293 |
Amortization expense for intangible assets was $14.0 million for the nine months ended June 30, 2021, compared to $15.3 million for the nine months ended June 30, 2020.

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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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