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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Sep. 30, 2013
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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.

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