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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, gross |  | $ 525,218 | $ 525,663
Accumulated amortization |  | (331,349) | (305,787)
Other intangible assets, net |  | 193,869 | 219,876
Customer Relationships [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, gross | [1],[2] | 491,461 | 492,656
Accumulated amortization |  | (303,478) | (279,287)
Non-compete Agreements [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, gross | [1] | 31,790 | 31,040
Accumulated amortization |  | (26,567) | (25,242)
Other [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, gross |  | 1,967 | 1,967
Accumulated amortization |  | $ (1,304) | $ (1,258)
[1] | Reflects the impact from the acquisition (Note 3).
[2] | Reflects the impact from the disposition of certain assets and operations in a non-strategic market of the propane segment (Note 3).

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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