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Intangibles, net | 6 Months Ended
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Mar. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangibles, net | 10) Intangibles, net The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | March 31, 2020 |  |  | September 30, 2019 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 383,388 |  |  | $ | 306,657 |  |  | $ | 76,731 |  |  | $ | 382,373 |  |  | $ | 297,221 |  |  | $ | 85,152 |
Trade names and other intangibles |  |  | 37,853 |  |  |  | 16,339 |  |  |  | 21,514 |  |  |  | 37,739 |  |  |  | 15,203 |  |  |  | 22,536 |
Total |  | $ | 421,241 |  |  | $ | 322,996 |  |  | $ | 98,245 |  |  | $ | 420,112 |  |  | $ | 312,424 |  |  | $ | 107,688 |
Amortization expense for intangible assets was $10.6 million for the six months ended March 31, 2020, compared to $9.3 million for the six months ended March 31, 2019.

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- Definition The entire disclosure for all or part of the information related to 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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