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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Jun. 01, 2015
Derivatives, Fair Value [Line Items]      
Benchmark interest rate     3.26%
Notional amount of foreign currency derivatives     $ 125,000
Fair Value      
Derivative assets, current $ 58,978 $ 40,743  
Derivative liabilities, current 51,879 32,791  
Derivative assets, noncurrent 3,741 4,334  
Derivative liabilities, noncurrent 2,606 5,529  
Derivative assets 62,719 45,087  
Derivative liabilities 54,485 38,330  
Designated as Hedging Instrument [Member] | NJRES [Member] | Foreign Currency Contracts [Member]      
Fair Value      
Derivative assets, current 0 0  
Derivative liabilities, current 52 0  
Derivative assets 0 0  
Derivative liabilities 52 0  
Not Designated as Hedging Instrument [Member]      
Fair Value      
Derivative assets 62,719 45,087  
Derivative liabilities 54,433 38,330  
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Financial Commodity Contracts [Member]      
Fair Value      
Derivative assets, current 48,314 35,682  
Derivative liabilities, current 15,675 13,347  
Derivative assets, noncurrent 696 2,626  
Derivative liabilities, noncurrent 95 386  
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Physical Forward Commodity Contracts [Member]      
Fair Value      
Derivative assets, current 9,844 4,854  
Derivative liabilities, current 22,333 9,281  
Derivative assets, noncurrent 3,045 1,718  
Derivative liabilities, noncurrent 650 0  
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Financial Commodity Contracts [Member]      
Fair Value      
Derivative assets, current 820 207  
Derivative liabilities, current 13,819 10,163  
Derivative assets, noncurrent 0 0  
Derivative liabilities, noncurrent 0 925  
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Interest Rate Contracts [Member]      
Fair Value      
Derivative assets, noncurrent 0 0  
Derivative liabilities, noncurrent 1,861 $ 4,228  
First Mortgage [Member] | Series Ll [Member] | NJNG [Member]      
Derivatives, Fair Value [Line Items]      
Debt issued $ 125,000    
Interest rate, stated percentage 5.60%