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Intangibles, net | 3 Months Ended
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Dec. 31, 2018
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):
|  | December 31, 2018 |  |  | September 30, 2018 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 359,073 |  |  | $ | 284,098 |  |  | $ | 74,975 |  |  | $ | 358,776 |  |  | $ | 279,990 |  |  | $ | 78,786 |
Trade names and other intangibles |  |  | 32,739 |  |  |  | 13,595 |  |  |  | 19,144 |  |  |  | 32,739 |  |  |  | 13,081 |  |  |  | 19,658 |
Total |  | $ | 391,812 |  |  | $ | 297,693 |  |  | $ | 94,119 |  |  | $ | 391,515 |  |  | $ | 293,071 |  |  | $ | 98,444 |
Amortization expense for intangible assets was $4.6 million for the three months ended December 31, 2018, compared to $4.7 million for the three months ended December 31, 2017.

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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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