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Goodwill and Intangible Assets, net | 3 Months Ended
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Dec. 31, 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, 2021 |  | $ | 253,398 |
Fiscal year 2022 business combinations |  |  | 800 |
Balance as of December 31, 2021 |  | $ | 254,198 |
Intangibles, net 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 |
Amortization expense for intangible assets was $4.8 million for the three months ended December 31, 2021, compared to $4.4 million for the three months ended December 31, 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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