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Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Summary Of Significant Accounting Policies [Line Items]    
Prepayments $ 11,173 $ 10,079
Prepaid Property and Other Taxes 11,061 13,743
Fair Values of Firm Commitments 11,078 0
Regulatory Assets 16,137 22,719
Other Current Assets 49,449 54,752
Federal [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable $ 0 $ 8,211