Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Leases [Abstract]
Operating	$ 1,097	$ 869	$ 2,921	$ 2,684
Short-term	83	33	225	85
Variable	47	44	63	89
Sublease income (a)	(71)	(69)	(214)	(188)
Total lease costs	$ 1,156	$ 877	$ 2,995	$ 2,670