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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 01, 2015
Sep. 30, 2014
Derivatives, Fair Value [Line Items]      
Benchmark interest rate   3.26%  
Notional amount of foreign currency derivatives $ 125,000 $ 125,000  
Derivative assets, current 38,291   $ 64,223
Derivative liabilities, current 52,989   79,863
Derivative assets, noncurrent 7,977   5,654
Derivative liabilities, noncurrent 2,415   6,690
Derivative assets 46,268   69,877
Derivative liabilities 55,404   86,553
Designated as Hedging Instrument [Member] | NJRES [Member] | Foreign Currency Contract [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets, current 0   0
Derivative liabilities, current 0   155
Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 46,268   69,877
Derivative liabilities 55,404   86,398
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Financial Commodity Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets, current 26,509   46,307
Derivative liabilities, current 21,388   46,725
Derivative assets, noncurrent 3,569   5,537
Derivative liabilities, noncurrent 2,415   6,533
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Physical Forward Commodity Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets, current 11,007   15,391
Derivative liabilities, current 16,900   30,778
Derivative assets, noncurrent 958   35
Derivative liabilities, noncurrent 0   132
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Financial Commodity Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets, current 775   2,525
Derivative liabilities, current 14,701   2,205
Derivative assets, noncurrent 545   82
Derivative liabilities, noncurrent 0   25
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Interest Rate Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets, noncurrent 2,905   0
Derivative liabilities, noncurrent $ 0   $ 0
First Mortgage [Member] | Series Ll [Member] | NJNG [Member]      
Derivatives, Fair Value [Line Items]      
Debt issued   $ 125,000  
Interest rate, stated percentage   5.60%