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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - GAS IN STORAGE (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 MMcf | Sep. 30, 2013 MMcf
--- | --- | ---
Inventory [Line Items] |  |
Gas in Storage | $ 139,021 | $ 314,477
Gas in Storage (Bcf) | 25,300 | 82,700
NJNG [Member] |  |
Inventory [Line Items] |  |
Gas in Storage | 12,582 | 104,979
Gas in Storage (Bcf) | 2,100 | 20,400
NJRES [Member] |  |
Inventory [Line Items] |  |
Gas in Storage | $ 126,439 | $ 209,498
Gas in Storage (Bcf) | 23,200 | 62,300

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- Definition Gas Stored Underground Nonmonetary Number of Billion Cubic Feet of Gas in Storage as of the balance sheet date. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 + Details
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- Details
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