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Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended | 66 Months Ended
--- | --- | --- | --- | ---
May 17, 2021 | Oct. 10, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2017 | Mar. 31, 2021
Receivables with Imputed Interest [Line Items] |  |  |  |  |  |  |
Interest income |  |  | $ 411 | $ 924 | $ 1,448 |  |
Loss on sale of financing receivable |  |  | 1,100 |  |  |  |
Tanager Acquisitions Promissory Note |  |  |  |  |  |  |
Receivables with Imputed Interest [Line Items] |  |  |  |  |  |  |
Receivable with imputed interest, face amount |  |  |  |  |  | $ 12,300 |
Receivable with imputed interest, term (in years) |  |  |  |  |  | 5 years |
Proceeds from collection of notes receivable | $ 3,500 | $ 2,500 |  |  |  |  | $ 7,700
Interest income |  | $ 400 |  |  |  |  |
Receivable with imputed interest, net amount |  |  | $ 4,600 |  |  |  | $ 4,600

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