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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Sep. 30, 2013
NJRES [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets $ 47,494 [1] $ 52,465 [1]
Offsetting Derivative Instruments, Derivative assets (42,451) [2] (29,617) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] 6,770 [3]
Net Amounts, Derivative assets 5,043 [4] 29,618 [4]
Amounts Presented in Balance Sheets, Derivative liabilities 81,865 [1] 40,663 [1]
Offsetting Derivative Instruments, Derivative liabilities (43,148) [2] (29,617) [2]
Financial Collateral Received/Pledged, Derivative liabilities (9,801) [3] (500) [3]
Net Amounts, Derivative liabilities 28,916 [4] 10,546 [4]
NJRES [Member] | Physical Forward Commodity Contracts [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets 12,304 [1] 11,823 [1]
Offsetting Derivative Instruments, Derivative assets (7,261) [2] (3,549) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] (100) [3]
Net Amounts, Derivative assets 5,043 [4] 8,174 [4]
Amounts Presented in Balance Sheets, Derivative liabilities 37,344 [1] 14,595 [1]
Offsetting Derivative Instruments, Derivative liabilities (7,958) [2] (3,549) [2]
Financial Collateral Received/Pledged, Derivative liabilities (500) [3] (500) [3]
Net Amounts, Derivative liabilities 28,886 [4] 10,546 [4]
NJRES [Member] | Financial Commodity Contracts [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets 35,189 [1] 40,626 [1]
Offsetting Derivative Instruments, Derivative assets (35,189) [2] (26,063) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] 6,870 [3]
Net Amounts, Derivative assets 0 [4] 21,433 [4]
Amounts Presented in Balance Sheets, Derivative liabilities 44,492 [1] 26,063 [1]
Offsetting Derivative Instruments, Derivative liabilities (35,189) [2] (26,063) [2]
Financial Collateral Received/Pledged, Derivative liabilities (9,301) [3] 0 [3]
Net Amounts, Derivative liabilities 2 [4] 0 [4]
NJRES [Member] | Foreign Currency Contract [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets 1 [1] 16 [1]
Offsetting Derivative Instruments, Derivative assets (1) [2] (5) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] 0 [3]
Net Amounts, Derivative assets 0 [4] 11 [4]
Amounts Presented in Balance Sheets, Derivative liabilities 29 [1] 5 [1]
Offsetting Derivative Instruments, Derivative liabilities (1) [2] (5) [2]
Financial Collateral Received/Pledged, Derivative liabilities 0 [3] 0 [3]
Net Amounts, Derivative liabilities 28 [4] 0 [4]
NJNG [Member] | Financial Commodity Contracts [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets 7,955 [1] 3,623 [1]
Offsetting Derivative Instruments, Derivative assets (2,201) [2] (2,185) [2]
Financial Collateral Received/Pledged, Derivative assets 1,256 [3] 214 [3]
Net Amounts, Derivative assets 7,010 [4] 1,652 [4]
Amounts Presented in Balance Sheets, Derivative liabilities 2,201 [1] 2,185 [1]
Offsetting Derivative Instruments, Derivative liabilities (2,201) [2] (2,185) [2]
Financial Collateral Received/Pledged, Derivative liabilities 0 [3] 0 [3]
Net Amounts, Derivative liabilities $ 0 [4] $ 0 [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 FCM's 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.