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Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Summary Of Significant Accounting Policies [Line Items]    
Prepayments $ 14,289 $ 12,728
Prepaid Property and Other Taxes 11,684 14,361
Fair Values of Firm Commitments 4,384 7,538
Regulatory Assets 14,189 11,460
Other Current Assets 47,652 97,054
Federal [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable 0 42,388
State [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable $ 3,106 $ 8,579