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Investments in Unconsolidated Entities - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | May 19, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |
Impairment of unconsolidated entity investment | $ 0 | $ 0 | $ 0 |
Imagine Homes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage |  |  |  | 33.00%
Financial Guarantee |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Outstanding guarantees | $ 0 | $ 0 |  |

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