Leases (Lease-Related Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases	$ 5,151	$ 5,303	$ 5,707
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for finance leases	157	51	58
Cash paid for amounts included in the measurement of lease liabilities: Financing cash flows for finance leases	779	796	1,639
Right-of-use assets obtained in exchange for recorded lease obligations: Operating leases	2,230	14,678	6,871
Right-of-use assets obtained in exchange for recorded lease obligations: Finance leases	$ 48	$ 4,046	$ 35