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Summary of Significant Accounting Policies - Equity Method Investments and Variable Interest Entities (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2010 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Limited partner equity interest (as a percent) (at least) |  |  | 50.00% |  |
Net investment income (loss) |  |  | $ (148) | $ 0 | $ 2
Share of distributions |  | $ 675 | 324 | 171 |
Interest and Investment, Net |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net investment income (loss) |  | $ 57 | $ (202) | $ (103) |
Magnolia |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Limited partner equity interest (as a percent) (at least) | 39.00% |  |  |  |
Investment amount | $ 12,150 |  |  |  |
Minimum percentage of certificate face amount | 0.05 |  |  |  |
Acquisition fee (as a percent) | 0.01 |  |  |  |

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