Leases - Additional information related to leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 6,101	$ 5,504
Operating cash flows from finance leases	973	1,228
Financing cash flows from finance leases	1,224	1,757
Right-of-use assets obtained in exchange for operating lease liabilities	$ 4,160	$ 15,609
Weighted-average remaining lease term:
Operating leases	9 years 3 months 18 days	10 years 3 months 18 days
Finance leases	12 years	11 years 8 months 12 days
Weighted-average discount rate:
Operating leases	3.20%	3.10%
Finance leases	4.60%	4.20%