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Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Summary Of Significant Accounting Policies [Line Items]    
Prepayments $ 8,765 $ 11,126
Prepaid Property and Other Taxes 15,602 14,088
Fair Values of Firm Commitments 986 1,739
Regulatory Assets 12,362 9,792
Other Current Assets 69,219 68,024
State [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable 9,030 8,822
Other Current Assets [Member] | Federal [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable $ 22,474 $ 22,457