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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Sep. 30, 2013
NJRES [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets $ 32,065 [1] $ 52,465 [1]
Offsetting Derivative Instruments, Derivative assets (28,424) [2] (29,617) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] 6,770 [3]
Net Amounts, Derivative assets 3,641 [4] 29,618 [4]
Amounts Presented in Balance Sheets, Derivative liabilities 75,417 [1] 40,663 [1]
Offsetting Derivative Instruments, Derivative liabilities (28,604) [2] (29,617) [2]
Financial Collateral Received/Pledged, Derivative liabilities (13,721) [3] (500) [3]
Net Amounts, Derivative liabilities 33,092 [4] 10,546 [4]
NJRES [Member] | Physical Forward Commodity Contracts [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets 5,831 [1] 11,823 [1]
Offsetting Derivative Instruments, Derivative assets (2,190) [2] (3,549) [2]
Financial Collateral Received/Pledged, Derivative assets 0 [3] (100) [3]
Net Amounts, Derivative assets 3,641 [4] 8,174 [4]
Amounts Presented in Balance Sheets, Derivative liabilities 35,679 [1] 14,595 [1]
Offsetting Derivative Instruments, Derivative liabilities (2,371) [2] (3,549) [2]
Financial Collateral Received/Pledged, Derivative liabilities (500) [3] (500) [3]
Net Amounts, Derivative liabilities 32,808 [4] 10,546 [4]
NJRES [Member] | Financial Commodity Contracts [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets 26,234 [1] 40,626 [1]
Offsetting Derivative Instruments, Derivative assets (26,234) [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 39,454 [1] 26,063 [1]
Offsetting Derivative Instruments, Derivative liabilities (26,233) [2] (26,063) [2]
Financial Collateral Received/Pledged, Derivative liabilities (13,221) [3] 0 [3]
Net Amounts, Derivative liabilities 0 [4] 0 [4]
NJRES [Member] | Foreign Currency Contract [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets 0 [1] 16 [1]
Offsetting Derivative Instruments, Derivative assets 0 [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 284 [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 284 [4] 0 [4]
NJNG [Member] | Financial Commodity Contracts [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Amounts Presented in Balance Sheets, Derivative assets 15,387 [1] 3,623 [1]
Offsetting Derivative Instruments, Derivative assets (998) [2] (2,185) [2]
Financial Collateral Received/Pledged, Derivative assets (10,772) [3] 214 [3]
Net Amounts, Derivative assets 3,617 [4] 1,652 [4]
Amounts Presented in Balance Sheets, Derivative liabilities 998 [1] 2,185 [1]
Offsetting Derivative Instruments, Derivative liabilities (998) [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.