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Goodwill and Intangibles, net (Tables) | 3 Months Ended
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Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Changes in the Company's Goodwill | A summary of changes in the Company’s goodwill is as follows (in thousands):
Balance as of September 30, 2017 |  | $ | 225,915 |
Fiscal year 2018 business combinations |  |  | 63 |
Balance as of December 31, 2017 |  | $ | 225,978 |
Intangible Assets Subject to Amortization | The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | December 31, 2017 |  |  | September 30, 2017 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 346,995 |  |  | $ | 268,362 |  |  | $ | 78,633 |  |  | $ | 346,784 |  |  | $ | 264,632 |  |  | $ | 82,152 |
Trade names and other intangibles |  |  | 32,047 |  |  |  | 10,037 |  |  |  | 22,010 |  |  |  | 32,047 |  |  |  | 8,981 |  |  |  | 23,066 |
Total |  | $ | 379,042 |  |  | $ | 278,399 |  |  | $ | 100,643 |  |  | $ | 378,831 |  |  | $ | 273,613 |  |  | $ | 105,218 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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