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Financial Instruments Balance Sheet Location (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Derivatives, Fair Value [Line Items]    
Derivative, Collateral, Right to Reclaim Cash $ 22,700 $ 10,100
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 3,100 14,700
Regulated Distribution Segment [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 36,140 111,191
Derivative Asset, Contract Netting 0 0
Derivative Asset, Net of Contract Netting 36,140 111,191
Derivative, Collateral, Right to Reclaim Cash 0 0
Derivative Asset 36,140 111,191
Derivative Liability, Fair Value, Gross Liability (21,856) (1,543)
Derivative Liability, Contract Netting 0 0
Derivative Liability, Net of Contract Netting (21,856) (1,543)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative Liability (21,856) (1,543)
Regulated Distribution Segment [Member] | Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 34,477 107,512
Derivative Liability, Fair Value, Gross Liability (19,835) 0
Regulated Distribution Segment [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Commodity Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Regulated Distribution Segment [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Interest Rate Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 21,869  
Regulated Distribution Segment [Member] | 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 0 0
Regulated Distribution Segment [Member] | 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 12,608 107,512
Regulated Distribution Segment [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 0
Regulated Distribution Segment [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Interest Rate Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0  
Regulated Distribution Segment [Member] | 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
Regulated Distribution Segment [Member] | 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 (19,835) 0
Regulated Distribution Segment [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,663 3,679
Derivative Liability, Fair Value, Gross Liability (2,021) (1,543)
Regulated Distribution Segment [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Commodity Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1,233 1,837
Regulated Distribution Segment [Member] | 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 430 1,842
Regulated Distribution Segment [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (1,730) (1,543)
Regulated Distribution Segment [Member] | 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 (291) 0
Nonregulated Segment [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 69,023 115,880
Derivative Asset, Contract Netting (69,023) (115,875)
Derivative Asset, Net of Contract Netting 0 5
Derivative, Collateral, Right to Reclaim Cash 22,725 10,124
Derivative Asset 22,725 10,129
Derivative Liability, Fair Value, Gross Liability (72,056) (130,580)
Derivative Liability, Contract Netting 69,023 115,875
Derivative Liability, Net of Contract Netting (3,033) (14,705)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 3,033 14,705
Derivative Liability 0 0
Nonregulated Segment [Member] | Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 9,669 9,510
Derivative Liability, Fair Value, Gross Liability (9,541) (13,812)
Nonregulated Segment [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Commodity Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 8,912 9,094
Nonregulated Segment [Member] | 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  
Nonregulated Segment [Member] | 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 757 416
Nonregulated Segment [Member] | 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
Nonregulated Segment [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (7,082) (12,173)
Nonregulated Segment [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Interest Rate Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0  
Nonregulated Segment [Member] | 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 (2,459) (1,639)
Nonregulated Segment [Member] | 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 0 0
Nonregulated Segment [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 59,354 106,370
Derivative Liability, Fair Value, Gross Liability (62,515) (116,768)
Nonregulated Segment [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Commodity Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 43,677 65,388
Nonregulated Segment [Member] | 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 15,677 40,982
Nonregulated Segment [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (47,729) (70,876)
Nonregulated Segment [Member] | 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 $ (14,786) $ (45,892)