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Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Summary Of Significant Accounting Policies [Line Items]    
Prepayments $ 6,289 $ 12,728
Prepaid Property and Other Taxes 23,702 14,361
Fair Values of Firm Commitments 8,775 7,538
Regulatory Assets 15,582 11,460
Other Current Assets 100,188 97,054
Federal [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable 42,385 42,388
State [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable $ 3,455 $ 8,579