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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($)
Jun. 30, 2017
Sep. 30, 2016
Jun. 01, 2015
Derivatives, Fair Value [Line Items]      
Benchmark interest rate     3.26%
Notional amount of foreign currency derivatives     $ 125,000,000
Fair Value      
Derivative assets, current $ 24,718,000 $ 29,964,000  
Derivative liabilities, current 27,602,000 61,080,000  
Derivative assets, noncurrent 5,915,000 5,227,000  
Derivative liabilities, noncurrent 2,593,000 25,252,000  
Derivative assets 30,633,000 35,191,000  
Derivative liabilities 30,195,000 86,332,000  
Foreign currency contracts      
Derivatives, Fair Value [Line Items]      
Notional amount of foreign currency derivatives 919,000    
Not Designated as Hedging Instrument      
Fair Value      
Derivative assets 30,633,000 35,191,000  
Derivative liabilities 30,195,000 86,332,000  
NJNG | Not Designated as Hedging Instrument | Physical commodity contracts      
Fair Value      
Derivative assets, current 92,000 235,000  
Derivative liabilities, current 15,000 1,154,000  
NJNG | Not Designated as Hedging Instrument | Financial commodity contracts      
Fair Value      
Derivative assets, current 21,000 805,000  
Derivative liabilities, current 925,000 2,979,000  
Derivative assets, noncurrent 0 75,000  
Derivative liabilities, noncurrent 0 386,000  
NJNG | Not Designated as Hedging Instrument | Interest rate contracts      
Fair Value      
Derivative assets, current 0 0  
Derivative liabilities, current 8,594,000 0  
Derivative assets, noncurrent 0 0  
Derivative liabilities, noncurrent 0 23,073,000  
NJRES | Not Designated as Hedging Instrument | Physical commodity contracts      
Fair Value      
Derivative assets, current 5,205,000 5,994,000  
Derivative liabilities, current 3,851,000 11,660,000  
Derivative assets, noncurrent 4,917,000 3,987,000  
Derivative liabilities, noncurrent 1,443,000 1,212,000  
NJRES | Not Designated as Hedging Instrument | Financial commodity contracts      
Fair Value      
Derivative assets, current 19,384,000 22,929,000  
Derivative liabilities, current 14,217,000 45,255,000  
Derivative assets, noncurrent 998,000 1,165,000  
Derivative liabilities, noncurrent 1,150,000 581,000  
NJRES | Not Designated as Hedging Instrument | Foreign currency contracts      
Fair Value      
Derivative assets, current 16,000 1,000  
Derivative liabilities, current 0 $ 32,000  
Series Ll | NJNG      
Derivatives, Fair Value [Line Items]      
Debt issued $ 125,000,000    
Interest rate, stated percentage 5.60%