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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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