Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Assets and Liabilities, Lessee [Abstract]
Operating lease other non-current asset	$ 15,891	$ 15,684
Total lease assets	15,891	15,684
Operating lease other current liabilities	2,884	2,633
Operating lease other non-current liability	18,225	18,368
Total lease liabilities	$ 21,109	$ 21,001