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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
NJRES    
Derivative assets:    
Amounts Presented in Balance Sheets $ 36,146 $ 34,076
Offsetting Derivative Instruments (25,610) (20,783)
Financial Collateral Received/Pledged (200) (6,904)
Net Amounts 10,336 6,389
Derivative liabilities:    
Amounts Presented in Balance Sheets 33,327 58,740
Offsetting Derivative Instruments (25,610) (20,783)
Financial Collateral Received/Pledged (5,184) (26,691)
Net Amounts 2,533 11,266
NJRES | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 10,164 9,981
Offsetting Derivative Instruments (540) (2,837)
Financial Collateral Received/Pledged (200) (755)
Net Amounts 9,424 6,389
Derivative liabilities:    
Amounts Presented in Balance Sheets 3,048 12,872
Offsetting Derivative Instruments (540) (2,837)
Financial Collateral Received/Pledged 0 1,200
Net Amounts 2,508 11,235
NJRES | Financial commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 25,980 24,094
Offsetting Derivative Instruments (25,068) (17,945)
Financial Collateral Received/Pledged 0 (6,149)
Net Amounts 912 0
Derivative liabilities:    
Amounts Presented in Balance Sheets 30,252 45,836
Offsetting Derivative Instruments (25,068) (17,945)
Financial Collateral Received/Pledged (5,184) (27,891)
Net Amounts 0 0
NJRES | Foreign currency contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 2 1
Offsetting Derivative Instruments (2) (1)
Financial Collateral Received/Pledged 0 0
Net Amounts 0 0
Derivative liabilities:    
Amounts Presented in Balance Sheets 27 32
Offsetting Derivative Instruments (2) (1)
Financial Collateral Received/Pledged 0 0
Net Amounts 25 31
NJNG    
Derivative assets:    
Amounts Presented in Balance Sheets 2,304 1,115
Offsetting Derivative Instruments (930) (911)
Financial Collateral Received/Pledged (1,312) 0
Net Amounts 62 204
Derivative liabilities:    
Amounts Presented in Balance Sheets 5,337 27,592
Offsetting Derivative Instruments (930) (911)
Financial Collateral Received/Pledged 0 (2,485)
Net Amounts 4,407 24,196
NJNG | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 64 235
Offsetting Derivative Instruments (2) (31)
Financial Collateral Received/Pledged 0 0
Net Amounts 62 204
Derivative liabilities:    
Amounts Presented in Balance Sheets 17 1,154
Offsetting Derivative Instruments (2) (31)
Financial Collateral Received/Pledged 0 0
Net Amounts 15 1,123
NJNG | Financial commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 2,240 880
Offsetting Derivative Instruments (928) (880)
Financial Collateral Received/Pledged (1,312) 0
Net Amounts 0 0
Derivative liabilities:    
Amounts Presented in Balance Sheets 928 3,365
Offsetting Derivative Instruments (928) (880)
Financial Collateral Received/Pledged 0 (2,485)
Net Amounts 0 0
NJNG | Interest rate contracts    
Derivative liabilities:    
Amounts Presented in Balance Sheets 4,392 23,073
Offsetting Derivative Instruments 0 0
Financial Collateral Received/Pledged 0 0
Net Amounts $ 4,392 $ 23,073