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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2016
Summary of Changes in the Partnership's Goodwill | A summary of changes in the Partnership’s goodwill during the fiscal years ended September 30, 2016 and 2015 are as follows (in thousands):
Balance as of September 30, 2014 |  | $ | 209,331 |
Fiscal year 2015 business combinations |  |  | 1,714 |
Balance as of September 30, 2015 |  |  | 211,045 |
Fiscal year 2016 business combinations |  |  | 1,715 |
Balance as of September 30, 2016 |  | $ | 212,760 |
Components of Intangible Assets Subject to Amortization | Intangible assets subject to amortization consist of the following (in thousands):
|  | September 30, |
|  | 2016 |  |  | 2015 |
|  | Gross |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |
|  | Carrying |  |  | Accum. |  |  |  |  |  | Carrying |  |  | Accum. |  |  |  |
|  | Amount |  |  | Amortization |  |  | Net |  |  | Amount |  |  | Amortization |  |  | Net |
Customer lists |  | $ | 327,388 |  |  | $ | 250,427 |  |  | $ | 76,961 |  |  | $ | 322,027 |  |  | $ | 236,438 |  |  | $ | 85,589 |
Trade names and other intangibles |  |  | 27,134 |  |  |  | 6,439 |  |  |  | 20,695 |  |  |  | 26,774 |  |  |  | 5,046 |  |  |  | 21,728 |
Total |  | $ | 354,522 |  |  | $ | 256,866 |  |  | $ | 97,656 |  |  | $ | 348,801 |  |  | $ | 241,484 |  |  | $ | 107,317 |
Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization | Total estimated annual amortization expense related to intangible assets subject to amortization, for the year ended September 30, 2017 and the four succeeding fiscal years ended September 30, is as follows (in thousands):
|  | Amount |
2017 |  | $ | 15,100 |
2018 |  | $ | 14,261 |
2019 |  | $ | 14,027 |
2020 |  | $ | 12,418 |
2021 |  | $ | 9,923 |

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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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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 + Details
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