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Investments in Unconsolidated Entities - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Impairment of unconsolidated entity investment | $ 0 | $ 0 | $ 341,000
Financial Guarantee |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Outstanding guarantees | $ 0 | $ 0 |

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