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Investments in Unconsolidated Entities - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in income of unconsolidated entities | $ 313,000 | $ 4,000 | $ 424,000 | $ 138,000 |
Impairment of unconsolidated entity investments | 0 | $ 0 | 0 | $ 0 |
Financial Guarantee |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Outstanding guarantees | $ 0 |  | $ 0 |  | $ 0

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