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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 3 Months Ended
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Dec. 31, 2012
Accounting Policies [Abstract] |
Schedule of Utility Inventory | The following table summarizes gas in storage, at average cost by company as of:
| December 31, 2012 | September 30, 2012
($ in thousands) | Gas in Storage |  | Bcf | Gas in Storage |  | Bcf
NJNG |  | $ | 123,624 |  | 19.8 |  |  | $ | 145,379 |  | 22.2 |
NJRES |  | 192,321 |  | 57.6 |  |  | 119,814 |  | 45.5 |
Total |  | $ | 315,945 |  | 77.4 |  |  | $ | 265,193 |  | 67.7 |

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- Definition Tabular disclosure of all information related to inventories for utilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-05.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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