Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items]
Prepayments	$ 19,828	$ 17,757
Prepaid Property and Other Taxes	14,564	14,321
Regulatory Assets	21,117	21,358
Other Current Assets	61,117	59,369
State [Member]
Summary Of Significant Accounting Policies [Line Items]
Prepaid State Income Taxes	$ 5,608	$ 5,933