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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Net financial earnings (loss) | $ 151,920 |  | $ 68,664 |  | $ 191,780 |  | $ 104,157 |
Unrealized (gain) loss from derivative instruments and related transactions | (13,256) | [1] | 38,800 | [1] | 52,395 | [1] | 20,466 | [1]
Effects of economic hedging related to natural gas inventory | (18,668) |  | (2,117) |  | (41,548) |  | (22,865) |
Tax adjustments | 10,873 |  | (13,488) |  | 269 |  | 881 |
NET INCOME | 172,971 |  | 45,469 |  | 180,664 |  | 105,675 |
Transactions Between NJNG and NJRES [Member] |  |  |  |  |  |  |  |
Unrealized losses related to intercompany transactions | $ (957) |  | $ (377) |  | $ (672) |  | $ (310) |
[1] | Excludes unrealized losses related to an intercompany transaction between NJNG and NJRES that have been eliminated in consolidation of approximately $(957,000) and $(377,000) for the three months ended and $(672,000) and $(310,000) for the six months ended March 31, 2014 and 2013, respectively.

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