Leases (Lease-Related Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Assets:
Operating lease assets	$ 27,135	$ 24,680
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Finance lease assets	$ 2,516	$ 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	$ 29,651	$ 28,017
Current liabilities:
Operating lease liabilities	$ 5,029	$ 4,594
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued liabilities	Accrued liabilities
Finance lease liabilities	$ 719	$ 817
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of long-term debt	Current portion of long-term debt
Noncurrent liabilities:
Operating lease liabilities	$ 22,670	$ 20,685
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Finance lease liabilities	$ 2,017	$ 2,733
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt, less current portion	Long-term debt, less current portion
Total lease liabilities	$ 30,435	$ 28,829