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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) (USD $) | Jun. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | $ 65,478,000 | $ 48,021,000
Derivative liabilities, current | 36,211,000 | 42,440,000
Derivative assets, noncurrent | 1,720,000 | 2,328,000
Derivative liabilities, noncurrent | 4,116,000 | 3,133,000
Derivative assets | 67,198,000 | 50,349,000
Derivative liabilities | 40,327,000 | 45,573,000
Notional amount of foreign currency derivatives | 3,800,000 |
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 67,147,000 | 50,163,000
Derivative liabilities | 40,287,000 | 45,461,000
Foreign Exchange Contract [Member] | NJRES [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 51,000 | 116,000
Derivative liabilities, current | 17,000 | 97,000
Derivative assets, noncurrent | 0 | 70,000
Derivative liabilities, noncurrent | 23,000 | 15,000
Derivative assets | 51,000 | 186,000
Derivative liabilities | 40,000 | 112,000
Financial Commodity Contracts [Member] | NJRES [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 52,635,000 | 22,112,000
Derivative liabilities, current | 22,770,000 | 27,779,000
Derivative assets, noncurrent | 1,400,000 | 600,000
Derivative liabilities, noncurrent | 3,691,000 | 2,902,000
Financial Commodity Contracts [Member] | NJNG [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 4,496,000 | 6,203,000
Derivative liabilities, current | 3,305,000 | 5,034,000
Derivative assets, noncurrent | 0 | 1,000,000
Derivative liabilities, noncurrent | 386,000 | 0
Physical Commodity Contracts [Member] | NJRES [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 8,296,000 | 19,590,000
Derivative liabilities, current | 10,119,000 | 9,530,000
Derivative assets, noncurrent | 320,000 | 658,000
Derivative liabilities, noncurrent | $ 16,000 | $ 216,000

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