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DEBT - SCHEDULE OF LONG TERM DEBT (Details) |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 26, 2013 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jun. 30, 2015 USD ($) note | Jun. 30, 2014 USD ($) | Apr. 15, 2015 USD ($) | Nov. 07, 2014 USD ($) | Mar. 13, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transaction |  |  |  | $ 7,216,000 | $ 7,576,000 |  |  |
NJR [Member] | Debt Shelf Facility Prudential [Member] | Unsecured Senior Note 3.25% [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount issued and outstanding |  |  |  | $ 50,000,000 |  |  |  |
Interest rate, stated percentage |  |  |  | 3.25% |  |  |  |
NJR [Member] | Debt Shelf Facility Prudential [Member] | Unsecured Senior Note 3.48% [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 3.48% |
Debt issued |  |  |  |  |  |  | $ 100,000,000 |
NJR [Member] | Debt Shelf Facility Metlife 2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 100,000,000 |  |  |  |  |  |  |
Line of credit facility, issuance period | 3 years |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  | $ 100,000,000 |  |  |  |
NJR [Member] | Debt Shelf Facility Metlife [Member] | Unsecured Senior Note 1.94% [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount issued and outstanding |  |  |  | $ 25,000,000 |  |  |  |
Interest rate, stated percentage |  |  |  | 1.94% |  |  |  |
Number of debt instruments outstanding | note |  |  |  | 2 |  |  |  |
NJR [Member] | Debt Shelf Facility Metlife [Member] | Unsecured Senior Note 2.51% [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount issued and outstanding |  |  |  | $ 25,000,000 |  |  |  |
Interest rate, stated percentage |  |  |  | 2.51% |  |  |  |
NJNG [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transaction |  | $ 7,200,000 | $ 7,600,000 |  |  |  |  |
NJNG [Member] | First Mortgage [Member] | 2.82% Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 2.82% |  |
Debt issued |  |  |  |  |  | $ 50,000,000 |  |
NJNG [Member] | First Mortgage [Member] | 3.66% Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 3.66% |  |
Debt issued |  |  |  |  |  | $ 100,000,000 |  |
NJNG [Member] | First Mortgage [Member] | 3.58% Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 3.58%
Debt issued |  |  |  |  |  |  |  | $ 70,000,000
NJNG [Member] | First Mortgage [Member] | 4.61% Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 4.61%
Debt issued |  |  |  |  |  |  |  | $ 55,000,000

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -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 22 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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