Leases - Balance Sheet Information Related to Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Assets:
Deferred Charges	$ 41,317	$ 44,206
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Deferred Charges	Deferred Charges
Liabilities:
Other Accruals and Current Liabilities	$ 11,479	$ 11,518
Other Liabilities	$ 29,683	$ 32,616
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Accruals and Current Liabilities	Other Accruals and Current Liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities