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DERIVATIVE INSTRUMENTS, OFFSETTING OF ASSETS AND LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
NJRES [Member]
    
Offsetting Derivative Assets [Abstract]    
Amounts Presented on the Balance Sheets, Derivative assets $ 67,270 [1] $ 52,465 [1]
Offsetting Derivative Instruments, Derivative assets (63,375) [2] (29,617) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] 6,770 [3]
Net Amounts, Derivative assets 3,895 [4] 29,618 [4]
Offsetting Derivative Liabilities [Abstract]    
Amounts Presented in Balance Sheets, Derivative liabilities 84,323 [1] 40,663 [1]
Offsetting Derivative Instruments, Derivative liabilities (63,902) [2] (29,617) [2]
Financial Collateral Received/Pledged, Derivative liabilities (2,614) [3] (500) [3]
Net Amounts, Derivative liabilities 17,807 [4] 10,546 [4]
NJRES [Member] | Physical Forward Commodity Contracts [Member]
    
Offsetting Derivative Assets [Abstract]    
Amounts Presented on the Balance Sheets, Derivative assets 15,426 [1] 11,823 [1]
Offsetting Derivative Instruments, Derivative assets (11,531) [2] (3,549) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] (100) [3]
Net Amounts, Derivative assets 3,895 [4] 8,174 [4]
Offsetting Derivative Liabilities [Abstract]    
Amounts Presented in Balance Sheets, Derivative liabilities 30,910 [1] 14,595 [1]
Offsetting Derivative Instruments, Derivative liabilities (12,058) [2] (3,549) [2]
Financial Collateral Received/Pledged, Derivative liabilities (1,200) [3] (500) [3]
Net Amounts, Derivative liabilities 17,652 [4] 10,546 [4]
NJRES [Member] | Financial Commodity Contracts [Member]
    
Offsetting Derivative Assets [Abstract]    
Amounts Presented on the Balance Sheets, Derivative assets 51,844 [1] 40,626 [1]
Offsetting Derivative Instruments, Derivative assets (51,844) [2] (26,063) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] 6,870 [3]
Net Amounts, Derivative assets 0 [4] 21,433 [4]
Offsetting Derivative Liabilities [Abstract]    
Amounts Presented in Balance Sheets, Derivative liabilities 53,258 [1] 26,063 [1]
Offsetting Derivative Instruments, Derivative liabilities (51,844) [2] (26,063) [2]
Financial Collateral Received/Pledged, Derivative liabilities (1,414) [3] 0 [3]
Net Amounts, Derivative liabilities 0 [4] 0 [4]
NJRES [Member] | Foreign Currency Contract [Member]
    
Offsetting Derivative Assets [Abstract]    
Amounts Presented on the Balance Sheets, Derivative assets   16 [1]
Offsetting Derivative Instruments, Derivative assets   (5) [2]
Financial Collateral Received/Pledged, Derivative assets   0 [3]
Net Amounts, Derivative assets   11 [4]
Offsetting Derivative Liabilities [Abstract]    
Amounts Presented in Balance Sheets, Derivative liabilities 155 [1] 5 [1]
Offsetting Derivative Instruments, Derivative liabilities 0 [2] (5) [2]
Financial Collateral Received/Pledged, Derivative liabilities 0 [3] 0 [3]
Net Amounts, Derivative liabilities 155 [4] 0 [4]
NJNG [Member]
    
Offsetting Derivative Liabilities [Abstract]    
Amounts Presented in Balance Sheets, Derivative liabilities 2,230 [1] 2,185 [1]
Offsetting Derivative Instruments, Derivative liabilities (2,230) [2] (2,185) [2]
Financial Collateral Received/Pledged, Derivative liabilities 0 [3] 0 [3]
Net Amounts, Derivative liabilities 0 [4] 0 [4]
NJNG [Member] | Financial Commodity Contracts [Member]
    
Offsetting Derivative Assets [Abstract]    
Amounts Presented on the Balance Sheets, Derivative assets 2,607 [1] 3,623 [1]
Offsetting Derivative Instruments, Derivative assets (2,230) [2] (2,185) [2]
Financial Collateral Received/Pledged, Derivative assets (377) [3] 214 [3]
Net Amounts, Derivative assets $ 0 [4] $ 1,652 [4]
[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.