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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Jun. 01, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Benchmark interest rate |  | 3.26% |
Notional amount of foreign currency derivatives | $ 125,000 | $ 125,000 |
Derivative assets, current | 38,291 |  | $ 64,223
Derivative liabilities, current | 52,989 |  | 79,863
Derivative assets, noncurrent | 7,977 |  | 5,654
Derivative liabilities, noncurrent | 2,415 |  | 6,690
Derivative assets | 46,268 |  | 69,877
Derivative liabilities | 55,404 |  | 86,553
Designated as Hedging Instrument [Member] | NJRES [Member] | Foreign Currency Contract [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative assets, current | 0 |  | 0
Derivative liabilities, current | 0 |  | 155
Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative assets | 46,268 |  | 69,877
Derivative liabilities | 55,404 |  | 86,398
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Financial Commodity Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative assets, current | 26,509 |  | 46,307
Derivative liabilities, current | 21,388 |  | 46,725
Derivative assets, noncurrent | 3,569 |  | 5,537
Derivative liabilities, noncurrent | 2,415 |  | 6,533
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Physical Forward Commodity Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative assets, current | 11,007 |  | 15,391
Derivative liabilities, current | 16,900 |  | 30,778
Derivative assets, noncurrent | 958 |  | 35
Derivative liabilities, noncurrent | 0 |  | 132
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Financial Commodity Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative assets, current | 775 |  | 2,525
Derivative liabilities, current | 14,701 |  | 2,205
Derivative assets, noncurrent | 545 |  | 82
Derivative liabilities, noncurrent | 0 |  | 25
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Interest Rate Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative assets, noncurrent | 2,905 |  | 0
Derivative liabilities, noncurrent | $ 0 |  | $ 0
First Mortgage [Member] | Series Ll [Member] | NJNG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Debt issued |  | $ 125,000 |
Interest rate, stated percentage |  | 5.60% |

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