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Goodwill and Intangibles, net | 6 Months Ended
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Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangibles, net | 10) Goodwill and Intangibles, net Goodwill A summary of changes in Company’s goodwill is as follows (in thousands):
Balance as of September 30, 2018 |  | $ | 228,436 |
Fiscal year 2019 business combinations |  |  | 10,858 |
Balance as of March 31, 2019 |  | $ | 239,294 |
Intangibles, net The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | March 31, 2019 |  |  | September 30, 2018 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 359,073 |  |  | $ | 288,214 |  |  | $ | 70,859 |  |  | $ | 358,776 |  |  | $ | 279,990 |  |  | $ | 78,786 |
Trade names and other intangibles |  |  | 32,740 |  |  |  | 14,110 |  |  |  | 18,630 |  |  |  | 32,739 |  |  |  | 13,081 |  |  |  | 19,658 |
Total |  | $ | 391,813 |  |  | $ | 302,324 |  |  | $ | 89,489 |  |  | $ | 391,515 |  |  | $ | 293,071 |  |  | $ | 98,444 |
Amortization expense for intangible assets was $9.3 million for the six months ended March 31, 2019, compared to $9.6 million for the six months ended March 31, 2018.

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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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