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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) (USD $)
Jun. 30, 2013
Sep. 30, 2012
Derivatives, Fair Value [Line Items]    
Derivative assets, current $ 65,478,000 $ 48,021,000
Derivative liabilities, current 36,211,000 42,440,000
Derivative assets, noncurrent 1,720,000 2,328,000
Derivative liabilities, noncurrent 4,116,000 3,133,000
Derivative assets 67,198,000 50,349,000
Derivative liabilities 40,327,000 45,573,000
Notional amount of foreign currency derivatives 3,800,000  
Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 67,147,000 50,163,000
Derivative liabilities 40,287,000 45,461,000
Foreign Exchange Contract [Member] | NJRES [Member] | Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets, current 51,000 116,000
Derivative liabilities, current 17,000 97,000
Derivative assets, noncurrent 0 70,000
Derivative liabilities, noncurrent 23,000 15,000
Derivative assets 51,000 186,000
Derivative liabilities 40,000 112,000
Financial Commodity Contracts [Member] | NJRES [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets, current 52,635,000 22,112,000
Derivative liabilities, current 22,770,000 27,779,000
Derivative assets, noncurrent 1,400,000 600,000
Derivative liabilities, noncurrent 3,691,000 2,902,000
Financial Commodity Contracts [Member] | NJNG [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets, current 4,496,000 6,203,000
Derivative liabilities, current 3,305,000 5,034,000
Derivative assets, noncurrent 0 1,000,000
Derivative liabilities, noncurrent 386,000 0
Physical Commodity Contracts [Member] | NJRES [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets, current 8,296,000 19,590,000
Derivative liabilities, current 10,119,000 9,530,000
Derivative assets, noncurrent 320,000 658,000
Derivative liabilities, noncurrent $ 16,000 $ 216,000