Commitments and Contingencies - Leases and Asset Retirement Obligations Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Lease option to extend length (in years)	5 years
Operating lease expenses	$ 2,900	$ 2,200
ARO liability	$ 4,664	2,049	$ 2,022
Risk-free rate, minimum	1.73%
Risk-free rate, maximum	3.31%
Accretion expense	$ 90	$ 48
Minimum
Loss Contingencies [Line Items]
Operating lease, remaining lease term	1 year
Maximum
Loss Contingencies [Line Items]
Operating lease, remaining lease term	13 years