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Investments in Unconsolidated Entities - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Impairment of unconsolidated entity investment | $ 0 | $ 0 | $ 0
Financial Guarantee |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Outstanding guarantees | $ 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
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