Commitments And Contingencies (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Other Commitments [Line Items]
Estimated minimum liability for environmental remediation	$ 2,500
Other Regulatory Liabilities	164,390	$ 165,441
Estimated total project costs	500,000
Project costs	55,000
Environmental Site Remediation Costs
Other Commitments [Line Items]
Other Regulatory Liabilities	$ 5,200