Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 12,876	$ 15,299
Total lease assets	12,876	15,299
Current portion of operating lease liabilities	3,352	3,196
Operating lease liabilities	13,989	16,978
Total lease liabilities	$ 17,341	$ 20,174