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Goodwill and Intangibles, net (Tables) | 9 Months Ended
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Jun. 30, 2018
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 |  |  | 2,416 |
Balance as of June 30, 2018 |  | $ | 228,331 |
Intangible Assets Subject to Amortization | The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):
|  | June 30, 2018 |  |  | September 30, 2017 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 356,437 |  |  | $ | 276,075 |  |  | $ | 80,362 |  |  | $ | 346,784 |  |  | $ | 264,632 |  |  | $ | 82,152 |
Trade names and other intangibles |  |  | 32,528 |  |  |  | 12,031 |  |  |  | 20,497 |  |  |  | 32,047 |  |  |  | 8,981 |  |  |  | 23,066 |
Total |  | $ | 388,965 |  |  | $ | 288,106 |  |  | $ | 100,859 |  |  | $ | 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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