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Investments in Unconsolidated Entities - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |  |
Impairment of unconsolidated entity investments | $ 0 | $ 0 | $ 0 | $ 0 |
Unconsolidated Entities | Financial Guarantee |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Outstanding guarantees | $ 0 |  | $ 0 |  | $ 0

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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