Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items]
Prepayments	$ 24,060	$ 17,757
Prepaid Property and Other Taxes	11,420	14,321
Regulatory Assets	30,302	21,358
Other Current Assets	71,586	59,369
State [Member]
Summary Of Significant Accounting Policies [Line Items]
Prepaid State Income Taxes	$ 5,804	$ 5,933