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Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Summary Of Significant Accounting Policies [Line Items]    
Prepayments $ 13,777 $ 10,770
Prepaid Property and Other Taxes 11,501 14,444
Fair Values of Firm Commitments 5,618 1,739
Regulatory Assets 9,829 9,792
Other Current Assets 56,052 68,024
State [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable 8,773 8,822
Other Current Assets [Member] | Federal [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable $ 6,554 $ 22,457