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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 02, 2021 | Mar. 10, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 0 |  | $ 0 |  |  |  | $ 0
Transaction costs | 321,000 | $ 15,000 | 3,374,000 | $ 42,000 |  |  |
Unrecognized tax benefits | 0 |  | 0 |  |  |  | $ 0
Kansas Properties |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 19,100,000 |  | 19,100,000 |  |  | $ 19,100,000 |
Discontinued operation, carrying value |  |  |  |  |  | 22,000,000.0 |
Discontinued operation, fair value |  |  |  |  |  | 3,500,000 |
Goodwill, impairment loss |  |  | $ 18,500,000 |  |  |  |
Kansas Properties |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration |  |  |  |  | $ 3,500,000 | $ 3,500,000 |

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