Partnership Distributions - Summary of Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Distribution Made to Limited Partner [Line Items]
Distribution ($ per unit)	$ 0.5858	$ 0.4883
Distributions	$ 25,613	$ 19,851
Incentive distribution	2,421	520
Common Units
Distribution Made to Limited Partner [Line Items]
Distributions	13,876	11,566
Subordinated Units
Distribution Made to Limited Partner [Line Items]
Distributions	$ 9,316	$ 7,765

Amount of cash distribution paid to unit-holder of limited partnership (LP).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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Amount of incentive obligation paid in cash or stock during the period to a limited liability corporation managing member or limited partnership general partner.

+ References

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