Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Lease, Cost [Abstract]
Operating lease costs	$ 3,332	$ 2,468	$ 9,450	$ 7,028
Amortization of assets	183	18	409	147
Interest on lease liabilities	12		26	5
Total finance lease costs	195	18	435	152
Total operating and finance lease costs	3,527	2,486	9,885	7,180
Variable lease cost	752	783	2,764	2,056
Short-term lease costs	415	640	1,009	1,357
Sublease income	(2)		(6)
Total lease costs	$ 4,692	$ 3,909	$ 13,652	$ 10,593