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Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 10, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2015
Receivables with Imputed Interest [Line Items] |  |  |  |  |
Interest income |  | $ 1,448,000 | $ 785,000 | $ 606,000 |
Tanager Acquisitions Promissory Note |  |  |  |  |
Receivables with Imputed Interest [Line Items] |  |  |  |  |
Receivable with imputed interest, face amount |  |  |  |  | $ 12,300,000
Receivable with imputed interest, term (in years) |  |  |  |  | 5 years
Proceeds from collection of notes receivable |  | 4,000,000.0 |  |  |
Receivable with imputed interest, net amount |  | 8,300,000 |  |  |
Tanager Acquisitions Promissory Note | Other Assets |  |  |  |  |
Receivables with Imputed Interest [Line Items] |  |  |  |  |
Receivable with imputed interest, net amount |  | 5,500,000 |  |  |
Tanager Acquisitions Promissory Note | Prepaid Expenses and Other Current Assets |  |  |  |  |
Receivables with Imputed Interest [Line Items] |  |  |  |  |
Receivable with imputed interest, net amount |  | $ 2,800,000 |  |  |
Tanager Acquisitions Promissory Note | Subsequent Event |  |  |  |  |
Receivables with Imputed Interest [Line Items] |  |  |  |  |
Proceeds from collection of notes receivable | $ 2,500,000 |  |  |  |
Interest income | 400,000 |  |  |  |
Prepayment discount | $ 500,000 |  |  |  |

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