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Financial Instruments Balance Sheet Location (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 3,239 $ 44,141
Derivative Asset, Contract Netting 0 (39,290)
Derivative Asset, Net of Contract Netting 3,239 4,851
Derivative, Collateral, Right to Reclaim Cash 0 6,775
Derivative Asset 3,239 11,626 [1]
Derivative Liability, Fair Value, Gross Liability (112,398) (323,684)
Derivative Liability, Contract Netting 0 39,290
Derivative Liability, Net of Contract Netting (112,398) (284,394)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 43,575
Derivative Liability (112,398) (240,819) [1]
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 (112,076) (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
Designated as Hedging Instrument [Member] | Current Assets of Disposal Group Classified as Held for Sale [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   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] | Noncurrent Assets of Disposal Group Classified as Held for Sale [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   (68,481)
Designated as Hedging Instrument [Member] | Current Liabilities of Disposal Group Classified as Held for Sale [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability   (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 (112,076) (198,008)
Designated as Hedging Instrument [Member] | Noncurrent Liabilities of Disposal Group Classified as Held for Sale [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability   (3,779)
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 3,239 35,351
Derivative Liability, Fair Value, Gross Liability (322) (31,513)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 2,436 3,029
Not Designated as Hedging Instrument [Member] | Current Assets of Disposal Group Classified as Held for Sale [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   18,157
Not 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 803 1,822
Not Designated as Hedging Instrument [Member] | Noncurrent Assets of Disposal Group Classified as Held for Sale [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   12,343
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (322) 0
Not Designated as Hedging Instrument [Member] | Current Liabilities of Disposal Group Classified as Held for Sale [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability   18,812
Not 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 $ 0 0
Not Designated as Hedging Instrument [Member] | Noncurrent Liabilities of Disposal Group Classified as Held for Sale [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability   $ 12,701
[1] Our financial instruments and hedged portion of gas stored underground include assets and liabilities related to our natural gas marketing operations, which are classified as “held for sale” on our consolidated balance sheets at September 30, 2016.