Leases (Lease-Related Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Assets:
Operating lease	$ 25,100	$ 25,144
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets Noncurrent	Other Assets Noncurrent
Finance lease	$ 4,396	$ 5,474
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	$ 29,496	$ 30,618
Current liabilities:
Operating lease	$ 4,764	$ 4,587
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities Current	Accrued Liabilities Current
Finance lease	$ 914	$ 856
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Long Term Debt Current	Long Term Debt Current
Noncurrent liabilities:
Operating lease	$ 20,924	$ 21,443
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities Noncurrent	Other Liabilities Noncurrent
Finance lease	$ 3,770	$ 4,405
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long Term Debt Noncurrent	Long Term Debt Noncurrent
Total lease liabilities	$ 30,372	$ 31,291