Supporting Financial Information - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest expense	$ (521)	$ (870)
Amortization of deferred financing costs	(151)	(210)
Interest expense, net	$ (672)	$ (1,080)