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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) (USD $) | Dec. 31, 2013 | Sep. 30, 2013
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | $ 34,843,000 | $ 53,327,000
Derivative liabilities, current | 77,852,000 | 40,390,000
Derivative assets, noncurrent | 1,931,000 | 2,761,000
Derivative liabilities, noncurrent | 6,130,000 | 2,458,000
Derivative assets | 36,774,000 | 56,088,000
Derivative liabilities | 83,982,000 | 42,848,000
Notional amount of foreign currency derivatives | 8,300,000 |
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 36,772,000 | 56,072,000
Derivative liabilities | 83,937,000 | 42,843,000
Foreign Currency Contract [Member] | NJRES [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 2,000 | 16,000
Derivative liabilities, current | 33,000 | 3,000
Derivative assets, noncurrent | 0 | 0
Derivative liabilities, noncurrent | 12,000 | 2,000
Derivative assets | 2,000 | 16,000
Derivative liabilities | 45,000 | 5,000
Financial Commodity Contracts [Member] | NJRES [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 20,015,000 | 38,527,000
Derivative liabilities, current | 49,511,000 | 23,769,000
Derivative assets, noncurrent | 1,115,000 | 2,099,000
Derivative liabilities, noncurrent | 4,971,000 | 2,294,000
Financial Commodity Contracts [Member] | NJNG [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 6,586,000 | 3,502,000
Derivative liabilities, current | 39,000 | 2,045,000
Derivative assets, noncurrent | 0 | 121,000
Derivative liabilities, noncurrent | 0 | 140,000
Physical Forward Commodity Contracts [Member] | NJRES [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 8,240,000 | 11,282,000
Derivative liabilities, current | 28,269,000 | 14,573,000
Derivative assets, noncurrent | 816,000 | 541,000
Derivative liabilities, noncurrent | $ 1,147,000 | $ 22,000

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