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DERIVATIVE INSTRUMENTS, BALANCE SHEET RELATED DISCLOSURES (Details) (USD $)
Sep. 30, 2011
Sep. 30, 2010
Derivatives, Fair Value [Line Items]  
Derivative Assets, Current$ 100,338,000$ 135,186,000
Derivative Liabilities, Current68,698,00078,447,000
Derivative Assets, Noncurrent6,515,0007,957,000
Derivative Liabilities, Noncurrent6,341,0005,640,000
Derivative Assets106,853,000143,143,000
Derivative Liabilities75,039,00084,087,000
Notional Amount of Foreign Currency Derivatives7,600,000 
NJRES [Member] | Physical Commodity Contracts [Member] | Not Designated as Hedging Instrument [Member]
  
Derivatives, Fair Value [Line Items]  
Derivative Assets, Current33,240,00018,566,000
Derivative Liabilities, Current10,570,0005,879,000
Derivative Assets, Noncurrent4,450,0005,482,000
Derivative Liabilities, Noncurrent781,000179,000
NJNG [Member] | Financial Commodity Contracts [Member] | Not Designated as Hedging Instrument [Member]
  
Derivatives, Fair Value [Line Items]  
Derivative Assets, Current5,424,0009,952,000
Derivative Liabilities, Current13,258,00024,724,000
Derivative Assets, Noncurrent2,0000
Derivative Liabilities, Noncurrent620,0001,725,000
NJRES [Member] | Financial Commodity Contracts [Member] | Not Designated as Hedging Instrument [Member]
  
Derivatives, Fair Value [Line Items]  
Derivative Assets, Current61,521,000106,653,000
Derivative Liabilities, Current44,862,00047,844,000
Derivative Assets, Noncurrent1,936,0002,465,000
Derivative Liabilities, Noncurrent4,934,0003,736,000
NJRES [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
  
Derivatives, Fair Value [Line Items]  
Derivative Assets, Current153,00015,000
Derivative Liabilities, Current8,0000
Derivative Assets, Noncurrent127,00010,000
Derivative Liabilities, Noncurrent6,0000
Derivative Assets280,00025,000
Derivative Liabilities14,0000
Not Designated as Hedging Instrument [Member]
  
Derivatives, Fair Value [Line Items]  
Derivative Assets106,573,000143,118,000
Derivative Liabilities$ 75,025,000$ 84,087,000