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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
NJRES [Member]    
Derivative assets:    
Amounts Presented in Balance Sheets [1] $ 53,667 $ 44,870
Offsetting Derivative Instruments [2] (20,668) (15,060)
Financial Collateral Received/Pledged [3] (13,846) 3,841
Net Amounts [4] 19,153 33,651
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 33,612 23,004
Offsetting Derivative Instruments [2] (20,669) (15,059)
Financial Collateral Received/Pledged [3] (6,438) (1,200)
Net Amounts [4] 6,505 6,745
NJRES [Member] | Physical Commodity Contracts [Member]    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 6,159 6,562
Offsetting Derivative Instruments [2] (1,344) (1,326)
Financial Collateral Received/Pledged [3] (1,000) 0
Net Amounts [4] 3,815 5,236
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 9,050 9,271
Offsetting Derivative Instruments [2] (1,345) (1,326)
Financial Collateral Received/Pledged [3] (1,200) (1,200)
Net Amounts [4] 6,505 6,745
NJRES [Member] | Financial Commodity Contracts [Member]    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 47,501 38,308
Offsetting Derivative Instruments [2] (19,324) (13,734)
Financial Collateral Received/Pledged [3] (12,846) 3,841
Net Amounts [4] 15,331 28,415
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 24,562 13,733
Offsetting Derivative Instruments [2] (19,324) (13,733)
Financial Collateral Received/Pledged [3] (5,238) 0
Net Amounts [4] 0 0
NJRES [Member] | Foreign Currency Contracts [Member]    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 7  
Offsetting Derivative Instruments [2] 0  
Financial Collateral Received/Pledged [3] 0  
Net Amounts [4] 7  
NJNG [Member]    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 2,310  
Offsetting Derivative Instruments [2] (2,253)  
Financial Collateral Received/Pledged [3] 0  
Net Amounts [4] 57  
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 34,036 15,316
Offsetting Derivative Instruments [2] (2,253) (207)
Financial Collateral Received/Pledged [3] (18,762) (10,881)
Net Amounts [4] 13,021 4,228
NJNG [Member] | Physical Commodity Contracts [Member]    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 58  
Offsetting Derivative Instruments [2] (1)  
Financial Collateral Received/Pledged [3] 0  
Net Amounts [4] 57  
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 90  
Offsetting Derivative Instruments [2] (1)  
Financial Collateral Received/Pledged [3] 0  
Net Amounts [4] 89  
NJNG [Member] | Financial Commodity Contracts [Member]    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 2,252 207
Offsetting Derivative Instruments [2] (2,252) (207)
Financial Collateral Received/Pledged [3] 0 0
Net Amounts [4] 0 0
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 21,014 11,088
Offsetting Derivative Instruments [2] (2,252) (207)
Financial Collateral Received/Pledged [3] (18,762) (10,881)
Net Amounts [4] 0 0
NJNG [Member] | Interest Rate Contracts [Member]    
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 12,932 4,228
Offsetting Derivative Instruments [2] 0 0
Financial Collateral Received/Pledged [3] 0 0
Net Amounts [4] $ 12,932 $ 4,228
[1] Derivative assets and liabilities are presented on a gross basis in the balance sheet as the Company does not elect balance sheet offsetting under ASC 210-20.
[2] Offsetting derivative instruments include: transactions with NAESB netting election, transactions held by FCM's with net margining and transactions with ISDA netting.
[3] Financial collateral includes cash balances at FCMs as well as cash received from or pledged to other counterparties.
[4] Net amounts represent presentation of derivative assets and liabilities if the Company were to elect balance sheet offsetting under ASC 210-20.