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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Net financial earnings (loss) | $ 68,664,000 |  | $ 74,126,000 |  | $ 104,157,000 |  | $ 119,434,000 |
Unrealized loss (gain) from derivative instruments and related transactions, net of taxes (1) (2) | 24,534,000 | [1],[2] | 7,664,000 | [1],[2] | 12,940,000 | [1],[2] | (9,708,000) | [1],[2]
Effects of economic hedging related to natural gas inventory, net of taxes | (1,339,000) | [3] | 11,927,000 | [3] | (14,458,000) | [3] | 17,250,000 | [3]
NET INCOME | 45,469,000 |  | 54,535,000 |  | 105,675,000 |  | 111,892,000 |
Taxes related to unrealized loss (gain) from derivative instruments and related transactions | 14,700,000 |  | 4,400,000 |  | 7,900,000 |  | (5,900,000) |
Taxes related to effects of economic hedging related to natural gas inventory | (778,000) |  | 6,900,000 |  | (8,400,000) |  | 10,000,000 |
Transactions Between NJNG and NJRES [Member] |  |  |  |  |  |  |  |
Unrealized loss (gain) from derivative instruments and related transactions, net of taxes (1) (2) | $ (377,000) |  | $ 79,000 |  | $ (310,000) |  | $ 197,000 |
[1] | Includes taxes of approximately $14.7 million and $4.4 million, for the three months ended and $7.9 million and $(5.9) million for the six months ended March 31, 2013 and 2012, respectively.
[2] | Excludes unrealized (gains) losses related to an intercompany transaction between NJNG and NJRES that have been eliminated in consolidation of approximately $(377,000) and $79,000 for the three months ended and $(310,000) and $197,000 for the six months ended March 31, 2013 and 2012, respectively.
[3] | Includes taxes of approximately $(778,000) and $6.9 million for the three months ended and $(8.4) million and $10 million for the six months ended March 31, 2013 and 2012, respectively.

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