Credit Facilities - Summary of Loan Facilities and Subordinated Debt Financing (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Loan Balance	$ 179,359
SOFR
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	5.30%
Secured revolving line of credit
Debt Instrument [Line Items]
Loan Balance	$ 9,546	$ 0
Secured Debt
Debt Instrument [Line Items]
Loan Balance	169,813	22,000
Secured Debt | Term loan
Debt Instrument [Line Items]
Loan Balance	$ 169,800	$ 22,000
Secured Debt | Term loan | SOFR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	4.10%
Secured Debt | Term loan | LIBOR 1
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.50%
Secured Debt | Secured revolving line of credit
Debt Instrument [Line Items]
Loan Balance	$ 9,500	$ 0
Secured Debt | Secured revolving line of credit | SOFR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	4.10%
Secured Debt | Secured revolving line of credit | LIBOR 1
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.50%
Debt instrument, interest rate, effective percentage		2.52%