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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Part 2 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
      
Derivatives in Cash Flow Hedging Relationships [Abstract]      
Effective portion of gain (loss) reclassified from AOCI to income $ (302) $ 8,397 $ (1,861)
Ineffective portion of gain (loss) on derivatives recognized in income (786) (124) (344)
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Cash Flow Hedging [Member]
      
Derivatives in Cash Flow Hedging Relationships [Abstract]      
Effective portion of gain (loss) reclassified from AOCI to income (513) 8,397 (2,327)
Ineffective portion of gain (loss) on derivatives recognized in income (659) (299) (356)
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member]
      
Derivatives in Cash Flow Hedging Relationships [Abstract]      
Effective portion of gain (loss) recognized in OCI on derivatives 4,923 4,505 5,226
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Non-Regulated Gas Marketing Operating Revenue [Member] | Cash Flow Hedging [Member]
      
Derivatives in Cash Flow Hedging Relationships [Abstract]      
Effective portion of gain (loss) reclassified from AOCI to income (4) 18,929 7,443
Ineffective portion of gain (loss) on derivatives recognized in income (420) (36) 966
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Non-Regulated Gas Marketing Operating Expenses [Member] | Cash Flow Hedging [Member]
      
Derivatives in Cash Flow Hedging Relationships [Abstract]      
Effective portion of gain (loss) reclassified from AOCI to income (509) (10,532) (9,770)
Ineffective portion of gain (loss) on derivatives recognized in income (239) (263) (1,322)
Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Cash Flow Hedging [Member]
      
Derivatives in Cash Flow Hedging Relationships [Abstract]      
Effective portion of gain (loss) recognized in OCI on derivatives 5,046 4,802 5,581
Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member]
      
Derivatives in Cash Flow Hedging Relationships [Abstract]      
Effective portion of gain (loss) recognized in OCI on derivatives 123 297 355
Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Regulated Gas Distribution Other Operation Expenses [Member] | Cash Flow Hedging [Member]
      
Derivatives in Cash Flow Hedging Relationships [Abstract]      
Effective portion of gain (loss) reclassified from AOCI to income 211 0 466
Ineffective portion of gain (loss) on derivatives recognized in income (127) 175 12
Not Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Non-Regulated Gas Marketing Operating Revenue [Member]
      
Derivatives Not Designated as Hedging Instruments [Abstract]      
Gain (loss) recognized in income on derivatives (778) [1] (615) [1] (115) [1]
Not Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Non-Regulated Gas Marketing Operating Expenses [Member]
      
Derivatives Not Designated as Hedging Instruments [Abstract]      
Gain (loss) recognized in income on derivatives 0 [1] (625) [1] (3) [1]
Not Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member]
      
Derivatives Not Designated as Hedging Instruments [Abstract]      
Gain (loss) recognized in income on derivatives (815) [1] 3,248 [1] 3,488 [1]
Not Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Other Income and (Income Deduction) - Net [Member]
      
Derivatives Not Designated as Hedging Instruments [Abstract]      
Gain (loss) recognized in income on derivatives 41 [1] 19 [1] 37 [1]
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Non-Regulated Gas Marketing Operating Revenue [Member]
      
Derivatives Not Designated as Hedging Instruments [Abstract]      
Gain (loss) recognized in income on derivatives (78) [1] 3,782 [1] (660) [1]
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Non-Regulated Gas Marketing Operating Expenses [Member]
      
Derivatives Not Designated as Hedging Instruments [Abstract]      
Gain (loss) recognized in income on derivatives $ 0 [1] $ 687 [1] $ 4,229 [1]
[1] Gains and losses on the Utility’s natural gas derivative instruments, which are not designated as hedging instruments for financial reporting purposes, are deferred pursuant to the Utility’s PGA Clause and initially recorded as regulatory assets or regulatory liabilities. These gains and losses are excluded from the table above because they have no direct impact on the Statements of Consolidated Income. Such amounts are recognized in the Statements of Consolidated Income as a component of Regulated Gas Distribution Natural and Propane Gas operating expenses when they are recovered through the PGA Clause and reflected in customer billings.