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RELATED PARTY TRANSACTIONS (Details) (USD $) | 9 Months Ended |  |  |  |  | 9 Months Ended | 39 Months Ended |  | 9 Months Ended |  |  | 9 Months Ended
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Jun. 30, 2013 NJRES to Steckman RIdge and Iroquios Affliates [Member] | Jun. 30, 2012 NJRES to Steckman RIdge and Iroquios Affliates [Member] | Jun. 30, 2013 NJRES to Steckman Ridge Affiliate | Sep. 30, 2012 NJRES to Steckman Ridge Affiliate | Jun. 30, 2013 NJRES to Iroquois Affiliate [Member] | Sep. 30, 2012 NJRES to Iroquois Affiliate [Member] | Jun. 30, 2013 NJNG to Steckman RIdge Affiliate MMcf | Jun. 30, 2013 NJNG to Steckman RIdge Affiliate | Sep. 30, 2012 NJNG to Steckman RIdge Affiliate | Jun. 30, 2013 NJNG to Steckman RIdge and Iroquios Affiliates [Member] | Jun. 30, 2012 NJNG to Steckman RIdge and Iroquios Affiliates [Member] | Jun. 30, 2013 NJNG to Iroquois Affiliate [Member] | Sep. 30, 2012 NJNG to Iroquois Affiliate [Member] | Jun. 30, 2013 NJNG to NJRES Affiliate [Member] MMcf
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement | $ 4,600,000 | $ 5,000,000 |  |  |  |  |  |  |  | $ 4,300,000 | $ 3,900,000 |  |  |
Due to related parties |  |  | 157,000 | 170,000 | 392,000 | 394,000 | 775,000 | 775,000 | 775,000 |  |  | 61,000 | 61,000 |
Related party agreement term |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Agreement for natural gas storage capacity between NJNG and affiliate (MMcf) |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |
Approximate annual demand fees under agreement from April 1 2010 to March 31 2020 |  |  |  |  |  |  | $ 9,300,000 |  |  |  |  |  |  |
Natural gas sold at cost under asset management agreement (MMcf) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000

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- Definition Agreement for Natural Gas Storage Capacity Between NJNG and Affiliate + References No definition available. + Details
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- Definition Agreement between subsidiaries as a result of gas storage sold under asset management agreement + References No definition available. + Details
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- Definition Annual Projected Demand Fees based upon a related party agreement between various NJR Subsidiaries + References No definition available. + Details
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- Definition Related Party Agreement Term specific to an agreement between varaious NJR Subsidiaries. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph d -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 7 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 3, 4 -Article 9 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph c -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 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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