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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Sep. 30, 2014
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NJRES [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Amounts Presented in Balance Sheets, Derivative assets | [1] | $ 42,043 | $ 67,270
Offsetting Derivative Instruments, Derivative assets | [2] | (29,774) | (63,375)
Financial Collateral Received/Pledged, Derivative assets | [3] | 0 | 0
Net Amounts, Derivative assets | [4] | 12,269 | 3,895
Amounts Presented in Balance Sheets, Derivative liabilities | [1] | 40,703 | 84,323
Offsetting Derivative Instruments, Derivative liabilities | [2] | (29,775) | (63,902)
Financial Collateral Received/Pledged, Derivative liabilities | [3] | (1,200) | (2,614)
Net Amounts, Derivative liabilities | [4] | 9,728 | 17,807
NJRES [Member] | Physical Forward Commodity Contracts [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Amounts Presented in Balance Sheets, Derivative assets | [1] | 11,965 | 15,426
Offsetting Derivative Instruments, Derivative assets | [2] | (5,972) | (11,531)
Financial Collateral Received/Pledged, Derivative assets | [3] | 0 | 0
Net Amounts, Derivative assets | [4] | 5,993 | 3,895
Amounts Presented in Balance Sheets, Derivative liabilities | [1] | 16,900 | 30,910
Offsetting Derivative Instruments, Derivative liabilities | [2] | (5,972) | (12,058)
Financial Collateral Received/Pledged, Derivative liabilities | [3] | (1,200) | (1,200)
Net Amounts, Derivative liabilities | [4] | 9,728 | 17,652
NJRES [Member] | Financial Commodity Contracts [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Amounts Presented in Balance Sheets, Derivative assets | [1] | 30,078 | 51,844
Offsetting Derivative Instruments, Derivative assets | [2] | (23,802) | (51,844)
Financial Collateral Received/Pledged, Derivative assets | [3] | 0 | 0
Net Amounts, Derivative assets | [4] | 6,276 | 0
Amounts Presented in Balance Sheets, Derivative liabilities | [1] | 23,803 | 53,258
Offsetting Derivative Instruments, Derivative liabilities | [2] | (23,803) | (51,844)
Financial Collateral Received/Pledged, Derivative liabilities | [3] | 0 | (1,414)
Net Amounts, Derivative liabilities | [4] | 0 | 0
NJRES [Member] | Foreign Currency Contract [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Amounts Presented in Balance Sheets, Derivative liabilities | [1] |  | 155
Offsetting Derivative Instruments, Derivative liabilities | [2] |  | 0
Financial Collateral Received/Pledged, Derivative liabilities | [3] |  | 0
Net Amounts, Derivative liabilities | [4] |  | 155
NJNG [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Amounts Presented in Balance Sheets, Derivative assets | [1] | 4,225 |
Offsetting Derivative Instruments, Derivative assets | [2] | (1,320) |
Financial Collateral Received/Pledged, Derivative assets | [3] | 0 |
Net Amounts, Derivative assets | [4] | 2,905 |
NJNG [Member] | Financial Commodity Contracts [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Amounts Presented in Balance Sheets, Derivative assets | [1] | 1,320 | 2,607
Offsetting Derivative Instruments, Derivative assets | [2] | (1,320) | (2,230)
Financial Collateral Received/Pledged, Derivative assets | [3] | 0 | (377)
Net Amounts, Derivative assets | [4] | 0 | 0
Amounts Presented in Balance Sheets, Derivative liabilities | [1] | 14,701 | 2,230
Offsetting Derivative Instruments, Derivative liabilities | [2] | (1,320) | (2,230)
Financial Collateral Received/Pledged, Derivative liabilities | [3] | (13,381) | 0
Net Amounts, Derivative liabilities | [4] | 0 | $ 0
NJNG [Member] | Interest Rate Contracts [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Amounts Presented in Balance Sheets, Derivative assets | [1] | 2,905 |
Offsetting Derivative Instruments, Derivative assets | [2] | 0 |
Financial Collateral Received/Pledged, Derivative assets | [3] | 0 |
Net Amounts, Derivative assets | [4] | $ 2,905 |
[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.

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