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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) (USD $) | Mar. 31, 2014 | Sep. 30, 2013
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | $ 45,182,000 | $ 53,327,000
Derivative liabilities, current | 71,223,000 | 40,390,000
Derivative assets, noncurrent | 2,270,000 | 2,761,000
Derivative liabilities, noncurrent | 5,192,000 | 2,458,000
Derivative assets | 47,452,000 | 56,088,000
Derivative liabilities | 76,415,000 | 42,848,000
Notional amount of foreign currency derivatives | 6,900,000 |
Designated as Hedging Instrument [Member] | NJRES [Member] | Foreign Currency Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 0 | 16,000
Derivative liabilities, current | 277,000 | 3,000
Derivative assets, noncurrent | 0 | 0
Derivative liabilities, noncurrent | 7,000 | 2,000
Derivative assets | 0 | 16,000
Derivative liabilities | 284,000 | 5,000
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 47,452,000 | 56,072,000
Derivative liabilities | 76,131,000 | 42,843,000
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Financial Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 24,161,000 | 38,527,000
Derivative liabilities, current | 34,380,000 | 23,769,000
Derivative assets, noncurrent | 2,073,000 | 2,099,000
Derivative liabilities, noncurrent | 5,074,000 | 2,294,000
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Physical Forward Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 5,634,000 | 11,282,000
Derivative liabilities, current | 35,568,000 | 14,573,000
Derivative assets, noncurrent | 197,000 | 541,000
Derivative liabilities, noncurrent | 111,000 | 22,000
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Financial Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 15,387,000 | 3,502,000
Derivative liabilities, current | 998,000 | 2,045,000
Derivative assets, noncurrent | 0 | 121,000
Derivative liabilities, noncurrent | $ 0 | $ 140,000

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