Operating Leases - Lease Expense and Cash Payments & Weighted-Average Remaining Lease Term and Discount Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating lease expense	$ 1,018	$ 956	$ 2,099	$ 1,957
Cash payments on lease liabilities	$ 1,021	$ 1,103	$ 1,994	$ 2,244
Weighted-average remaining lease term	6 years 9 months 18 days	7 years 3 months 18 days	6 years 9 months 18 days	7 years 3 months 18 days
Weighted-average discount rate	6.07%	5.79%	6.07%	5.79%