Credit Facilities - Summary of Loan Facility (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Line of Credit Facility [Line Items]
Long-term debt	$ 37,500	$ 46,750
Secured Debt | Term Loans
Line of Credit Facility [Line Items]
Long-term debt	$ 37,500
Secured Debt | Term Loans | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate percentage	0.025%
Interest rate spread	0.46%
Interest rate floor	0.50%
Secured Debt | Revolving Line of Credit
Line of Credit Facility [Line Items]
Long-term debt	$ 0
Secured Debt | Revolving Line of Credit | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate percentage	0.025%
Interest rate spread	0.46%
Interest rate floor	0.50%