Leases (Lease-Related Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Assets:
Operating lease	$ 23,326	$ 24,680
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Finance lease	$ 2,863	$ 3,337
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
Total lease assets	$ 26,189	$ 28,017
Current liabilities:
Operating lease	$ 4,567	$ 4,594
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Finance lease	$ 699	$ 817
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Long-Term Debt, Current Maturities	Long-Term Debt, Current Maturities
Noncurrent liabilities:
Operating lease	$ 19,202	$ 20,685
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Finance lease	$ 2,380	$ 2,733
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-Term Debt, Excluding Current Maturities	Long-Term Debt, Excluding Current Maturities
Total lease liabilities	$ 26,848	$ 28,829