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RELATED PARTY TRANSACTIONS (Details) (USD $) | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
NJRES to Steckman Ridge and Iroquios Affiliates [Member] |  |
Related Party Transaction [Line Items] |  |
Demand fees recognized pertaining to related party agreement | $ 6,100,000 | $ 6,600,000
NJRES to Steckman Ridge Affiliate |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 159,000 | 170,000
NJRES to Iroquois Affiliate [Member] |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 390,000 | 394,000
NJNG to Steckman RIdge Affiliate |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 775,000 | 775,000
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 |
NJNG to Steckman RIdge and Iroquios Afffiliates [Member] |  |
Related Party Transaction [Line Items] |  |
Demand fees recognized pertaining to related party agreement | 5,900,000 | 5,600,000
NJNG to Iroquois Affiliate [Member] |  |
Related Party Transaction [Line Items] |  |
Due to related parties | $ 61,000 | $ 61,116
NJNG to NJRES Affilate [Member] |  |
Related Party Transaction [Line Items] |  |
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 NJR subsidaries + 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 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=26873400&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 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 7 Reference 6: 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 7: 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 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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- Details
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