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RELATED PARTY TRANSACTIONS (Details) (USD $)	6 Months Ended						6 Months Ended		6 Months Ended				6 Months Ended
	Mar. 31, 2014 NJRES to Steckman RIdge and Iroquios Affliates [Member]	Mar. 31, 2013 NJRES to Steckman RIdge and Iroquios Affliates [Member]	Mar. 31, 2014 NJRES to Steckman Ridge Affiliate	Sep. 30, 2013 NJRES to Steckman Ridge Affiliate	Mar. 31, 2014 NJRES to Iroquois Affiliate [Member]	Sep. 30, 2013 NJRES to Iroquois Affiliate [Member]	Mar. 31, 2014 NJNG to Steckman RIdge Affiliate MMcf	Sep. 30, 2013 NJNG to Steckman RIdge Affiliate	Mar. 31, 2014 NJNG to Steckman RIdge and Iroquios Affiliates [Member]	Mar. 31, 2013 NJNG to Steckman RIdge and Iroquios Affiliates [Member]	Mar. 31, 2014 NJNG to Iroquois Affiliate [Member]	Sep. 30, 2013 NJNG to Iroquois Affiliate [Member]	Mar. 31, 2014 NJNG to NJRES Affiliate [Member] MMcf
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	$ 1,500,000	$ 3,200,000							$ 4,800,000	$ 2,700,000
Due to related parties			166,000	159,000	403,000	390,000	776,000	775,000			62,000	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

X

- 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.

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X

- Definition

Annual Projected Demand Fees based upon a related party agreement between various NJR Subsidiaries

+ References

No definition available.

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- Definition

Related Party Agreement Term specific to an agreement between varaious NJR Subsidiaries.

+ References

No definition available.

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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

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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

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