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Financial Instruments Balance Sheet Location (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Derivatives Fair Value [Line Items]    
Derivative, Collateral, Right to Reclaim Cash $ 10,800 $ 22,700
Derivative Asset 12,695 58,865
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 20,500 3,100
Derivative Liability (52,140) (21,856)
Regulated Distribution Segment [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,889 36,140
Derivative Asset, Contract Netting 0 0
Derivative Asset, Net of Contract Netting 1,889 36,140
Derivative, Collateral, Right to Reclaim Cash 0 0
Derivative Asset 1,889 36,140
Derivative Liability, Fair Value, Gross Liability (52,140) (21,856)
Derivative Liability, Contract Netting 0 0
Derivative Liability, Net of Contract Netting (52,140) (21,856)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative Liability (52,140) (21,856)
Nonregulated Segment [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 104,206 69,023
Derivative Asset, Contract Netting (104,206) (69,023)
Derivative Asset, Net of Contract Netting 0 0
Derivative, Collateral, Right to Reclaim Cash 10,806 22,725
Derivative Asset 10,806 22,725
Derivative Liability, Fair Value, Gross Liability (124,723) (72,056)
Derivative Liability, Contract Netting 104,206 69,023
Derivative Liability, Net of Contract Netting (20,517) (3,033)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 20,517 3,033
Derivative Liability 0 0
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 570 34,477
Derivative Liability, Fair Value, Gross Liability (47,224) (19,835)
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member] | Other Current Assets [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   21,869
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member] | Other Current Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member] | Deferred Charges And Other Assets [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 570 12,608
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member] | Deferred Charges And Other Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member] | Other Current Liabilities [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability   0
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 0
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member] | Deferred Credits And Other Liabilities [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (47,224) (19,835)
Designated As Hedging Instrument [Member] | Regulated Distribution Segment [Member] | Deferred Credits And Other Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 0
Designated As Hedging Instrument [Member] | Nonregulated Segment [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 8,941 9,669
Derivative Liability, Fair Value, Gross Liability (39,013) (9,541)
Designated As Hedging Instrument [Member] | Nonregulated Segment [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] | Nonregulated Segment [Member] | Other Current Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 8,465 8,912
Designated As Hedging Instrument [Member] | Nonregulated Segment [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] | Nonregulated Segment [Member] | Deferred Charges And Other Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 476 757
Designated As Hedging Instrument [Member] | Nonregulated Segment [Member] | Other Current Liabilities [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability   0
Designated As Hedging Instrument [Member] | Nonregulated Segment [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (31,422) (7,082)
Designated As Hedging Instrument [Member] | Nonregulated Segment [Member] | Deferred Credits And Other Liabilities [Member] | Interest Rate Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 0
Designated As Hedging Instrument [Member] | Nonregulated Segment [Member] | Deferred Credits And Other Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (7,591) (2,459)
Nondesignated [Member] | Regulated Distribution Segment [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,319 1,663
Derivative Liability, Fair Value, Gross Liability (4,916) (2,021)
Nondesignated [Member] | Regulated Distribution Segment [Member] | Other Current Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 780 1,233
Nondesignated [Member] | Regulated Distribution Segment [Member] | Deferred Charges And Other Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 539 430
Nondesignated [Member] | Regulated Distribution Segment [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (4,916) (1,730)
Nondesignated [Member] | Regulated Distribution Segment [Member] | Deferred Credits And Other Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 (291)
Nondesignated [Member] | Nonregulated Segment [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 95,265 59,354
Derivative Liability, Fair Value, Gross Liability (85,710) (62,515)
Nondesignated [Member] | Nonregulated Segment [Member] | Other Current Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 86,265 43,677
Nondesignated [Member] | Nonregulated Segment [Member] | Deferred Charges And Other Assets [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 9,000 15,677
Nondesignated [Member] | Nonregulated Segment [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (78,374) (47,729)
Nondesignated [Member] | Nonregulated Segment [Member] | Deferred Credits And Other Liabilities [Member] | Commodity Contract [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ (7,336) $ (14,786)