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DERIVATIVE INSTRUMENTS, BALANCE SHEET RELATED DISCLOSURES (Details) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current $ 64,223,000 $ 53,327,000
Derivative Liabilities, Current 79,863,000 40,390,000
Derivative Assets, Noncurrent 5,654,000 2,761,000
Derivative Liabilities, Noncurrent 6,690,000 2,458,000
Derivative Assets 69,877,000 56,088,000
Derivative Liabilities 86,553,000 42,848,000
Notional amount of foreign currency derivatives 2,900,000  
Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Assets 69,877,000 56,072,000
Derivative Liabilities 86,398,000 42,843,000
Foreign Currency Contract [Member] | NJRES [Member] | Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current 0 16,000
Derivative Liabilities, Current 155,000 3,000
Derivative Assets, Noncurrent 0 0
Derivative Liabilities, Noncurrent 0 2,000
Derivative Assets 0 16,000
Derivative Liabilities 155,000 5,000
Financial Commodity Contracts [Member] | NJRES [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current 46,307,000 38,527,000
Derivative Liabilities, Current 46,725,000 23,769,000
Derivative Assets, Noncurrent 5,537,000 2,099,000
Derivative Liabilities, Noncurrent 6,533,000 2,294,000
Financial Commodity Contracts [Member] | NJNG [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current 2,525,000 3,502,000
Derivative Liabilities, Current 2,205,000 2,045,000
Derivative Assets, Noncurrent 82,000 121,000
Derivative Liabilities, Noncurrent 25,000 140,000
Physical Forward Commodity Contracts [Member] | NJRES [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current 15,391,000 11,282,000
Derivative Liabilities, Current 30,778,000 14,573,000
Derivative Assets, Noncurrent 35,000 541,000
Derivative Liabilities, Noncurrent $ 132,000 $ 22,000