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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) (USD $) | 3 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Net financial earnings (loss) | $ 35,493,000 |  | $ 45,308,000 |
Unrealized (gain) from derivative instruments and related transactions, net of taxes (1) (2) | (11,594,000) | [1],[2] | (17,372,000) | [1],[2]
Effects of economic hedging related to natural gas inventory, net of taxes | (13,119,000) | [3] | 5,323,000 | [3]
NET INCOME | 60,206,000 |  | 57,357,000 |
Taxes related to unrealized loss gain from derivative instruments and related transactions | (6,800,000) |  | (10,200,000) |
Taxes related to effects of economic hedging related to natural gas inventory | (7,600,000) |  | 3,100,000 |
Transactions Between NJNG and NJRES [Member] |  |  |  |
Unrealized (gain) from derivative instruments and related transactions, net of taxes (1) (2) | $ 67,000 |  | $ 118,000 |
[1] | Includes taxes of approximately $(6.8) million and $(10.2) million for the three months ended December 31, 2012 and 2011, respectively.
[2] | Excludes unrealized losses related to an intercompany transaction between NJNG and NJRES that have been eliminated in consolidation of approximately $67,000, and $118,000 for the three months ended December 31, 2012 and 2011, respectively.
[3] | Includes taxes of approximately $(7.6) million and $3.1 million for the three months ended December 31, 2012 and 2011, respectively.

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