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DERIVATIVE INSTRUMENTS, INCOME STATEMENT RELATED DISCLOSURES (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]      
Foreign currency cash flow hedge gain (loss) to be reclassified during next 12 months $ (155,000)    
Maximum date in foreign currency cash flow hedge Apr. 30, 2015    
Foreign Currency Contract [Member] | Gas Purchases [Member] | Cash Flow Hedging [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (432,000) [1] (44,000) [1]  
Amount of Gain or (Loss) Reclassified from OCI into Income (Effective Portion) 266,000 (18,000)  
Amount of Gain or (Loss) Recognized on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) 0 0  
NJRES [Member] | Nondesignated [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivatives (251,696,000) 25,106,000 87,652,000
NJRES [Member] | Physical Forward Commodity Contracts [Member] | Operating Revenues [Member] | Nondesignated [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivatives (48,977,000) 1,117,000 (7,187,000)
NJRES [Member] | Physical Forward Commodity Contracts [Member] | Gas Purchases [Member] | Nondesignated [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivatives (83,847,000) (17,194,000) 12,967,000
NJRES [Member] | Financial Commodity Contracts [Member] | Gas Purchases [Member] | Nondesignated [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivatives (118,872,000) 41,183,000 81,872,000
NJNG [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative instruments gain (loss) recognized in regulatory assets and liabilities, net $ 10,100,000 $ 1,800,000 $ (25,300,000)
[1] The settlement of foreign currency transactions over the next 12 months is expected to result in the reclassification of $(155,000) from OCI into earnings. The maximum tenor is April 2015.