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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 6 Months Ended
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Mar. 31, 2013
Accounting Policies [Abstract] |
Schedule of Utility Inventory | The following table summarizes gas in storage, at average cost by company as of:
| March 31, 2013 | September 30, 2012
($ in thousands) | Gas in Storage |  | Bcf | Gas in Storage |  | Bcf
NJNG |  | $ | 14,891 |  | 2.4 |  |  | $ | 145,379 |  | 22.2 |
NJRES |  | 152,772 |  | 43.8 |  |  | 119,814 |  | 45.5 |
Total |  | $ | 167,663 |  | 46.2 |  |  | $ | 265,193 |  | 67.7 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated Other Comprehensive Income
(Thousands) | Unrealized gain on available for sale securities | Net unrealized gain on derivatives | Adjustment to postemployment benefit obligation | Total
Beginning balance as of January 1, 2013 | $ | 4,601 |  |  | $ | 41 |  |  | $ | (15,330 | ) |  | $ | (10,688 | )
Other comprehensive income, excluding reclassifications, net of tax of $(447), $(9), $-, $(456) | 647 |  |  | 15 |  |  | — |  |  | 662 |
Amounts reclassified from accumulated other comprehensive income, net of tax of $-, $13, $(203), $(190) | — |  |  | (22 | ) | (1) | 296 |  | (2) | 274 |
Net current-period other comprehensive income, net of tax of $(447), $4, $(203), $(646) | 647 |  |  | (7 | ) |  | 296 |  |  | 936 |
Ending balance as of March 31, 2013 | $ | 5,248 |  |  | $ | 34 |  |  | $ | (15,034 | ) |  | $ | (9,752 | )
(1) | Reclassified to gas purchases in the Unaudited Consolidated Statements of Operations.
(2) | Included in the computation of net periodic pension cost, a component of operations and maintenance expense in the Unaudited Consolidated Statements of Operations.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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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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