Leases - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Lease, Cost [Abstract]
Operating lease costs	$ 9,396	$ 7,630
Amortization of assets	182	859
Interest on lease liabilities	5	39
Total finance lease costs	187	898
Variable lease cost	3	1,833
Short-term lease costs	1,411	199
Total lease costs	$ 10,997	$ 10,560