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Financial Instruments Balance Sheet Location (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 109,023 $ 44,141
Derivative Asset, Contract Netting (97,841) (39,290)
Derivative Asset, Net of Contract Netting 11,182 4,851
Derivative, Collateral, Right to Reclaim Cash 3,788 6,775
Derivative Asset 14,970 11,626
Derivative Liability, Fair Value, Gross Liability (230,745) (323,684)
Derivative Liability, Contract Netting (97,841) (39,290)
Derivative Liability, Net of Contract Netting (132,904) (284,394)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset (9,909) (43,575)
Derivative Liability (122,995) (240,819)
Designated As Hedging Instrument [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 8,790
Derivative Liability, Fair Value, Gross Liability (142,721) (292,171)
Designated As Hedging Instrument [Member] | Other Current Assets [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Designated As Hedging Instrument [Member] | Other Current Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 6,612
Designated As Hedging Instrument [Member] | Deferred Charges And Other Assets [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Designated As Hedging Instrument [Member] | Deferred Charges And Other Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   2,178
Designated As Hedging Instrument [Member] | Other Current Liabilities [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (25,060) (68,481)
Designated As Hedging Instrument [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (19,740) (21,903)
Designated As Hedging Instrument [Member] | Deferred Credits And Other Liabilities [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (97,921) (198,008)
Designated As Hedging Instrument [Member] | Deferred Credits And Other Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability   (3,779)
Nondesignated [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 109,023 35,351
Derivative Liability, Fair Value, Gross Liability (88,024) (31,513)
Nondesignated [Member] | Other Current Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 89,309 21,186
Nondesignated [Member] | Deferred Charges And Other Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 19,714 14,165
Nondesignated [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (71,433) (18,812)
Nondesignated [Member] | Deferred Credits And Other Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ (16,591) $ (12,701)