Supporting Financial Information - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest expense	$ 3,756	$ 4,282	$ 11,588	$ 9,972
Interest income	(10)	0	(34)	0
Amortization of deferred financing costs	397	635	1,437	1,540
Interest expense	$ 4,143	$ 4,917	$ 12,991	$ 11,512