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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 01, 2015
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Benchmark interest rate |  |  | 3.26%
Notional amount of foreign currency derivatives |  |  | $ 125,000
Fair Value |  |  |
Derivative assets, current | $ 58,978 | $ 40,743 |
Derivative liabilities, current | 51,879 | 32,791 |
Derivative assets, noncurrent | 3,741 | 4,334 |
Derivative liabilities, noncurrent | 2,606 | 5,529 |
Derivative assets | 62,719 | 45,087 |
Derivative liabilities | 54,485 | 38,330 |
Designated as Hedging Instrument [Member] | NJRES [Member] | Foreign Currency Contracts [Member] |  |  |
Fair Value |  |  |
Derivative assets, current | 0 | 0 |
Derivative liabilities, current | 52 | 0 |
Derivative assets | 0 | 0 |
Derivative liabilities | 52 | 0 |
Not Designated as Hedging Instrument [Member] |  |  |
Fair Value |  |  |
Derivative assets | 62,719 | 45,087 |
Derivative liabilities | 54,433 | 38,330 |
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Financial Commodity Contracts [Member] |  |  |
Fair Value |  |  |
Derivative assets, current | 48,314 | 35,682 |
Derivative liabilities, current | 15,675 | 13,347 |
Derivative assets, noncurrent | 696 | 2,626 |
Derivative liabilities, noncurrent | 95 | 386 |
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Physical Forward Commodity Contracts [Member] |  |  |
Fair Value |  |  |
Derivative assets, current | 9,844 | 4,854 |
Derivative liabilities, current | 22,333 | 9,281 |
Derivative assets, noncurrent | 3,045 | 1,718 |
Derivative liabilities, noncurrent | 650 | 0 |
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Financial Commodity Contracts [Member] |  |  |
Fair Value |  |  |
Derivative assets, current | 820 | 207 |
Derivative liabilities, current | 13,819 | 10,163 |
Derivative assets, noncurrent | 0 | 0 |
Derivative liabilities, noncurrent | 0 | 925 |
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Interest Rate Contracts [Member] |  |  |
Fair Value |  |  |
Derivative assets, noncurrent | 0 | 0 |
Derivative liabilities, noncurrent | 1,861 | $ 4,228 |
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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