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DEBT, NJR LONG-TERM DEBT (Details) - NJR [Member] | Sep. 26, 2013 USD ($) | Sep. 30, 2015 USD ($) debt_instrument | Sep. 15, 2015 USD ($) | Nov. 07, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jul. 25, 2014 USD ($) | Jun. 30, 2014 USD ($) | May. 10, 2013 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Unsecured Senior Notes 3.25% [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 50,000,000 |  |  | $ 50,000,000 |  |  |
Stated interest rate |  | 3.25% |  |  |  |  |  |
Unsecured Senior Notes 3.48% [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 100,000,000 |  | $ 100,000,000 | 0 |  |  |
Stated interest rate |  | 3.48% |  | 3.48% |  |  |  |
Unsecured Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of debt instruments | debt_instrument |  | 2 |  |  |  |  |  |
Unsecured Senior Notes 1.94% [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 0 | $ 25,000,000 |  | 25,000,000 |  |  |
Stated interest rate |  | 1.94% |  |  |  |  |  |
Unsecured Senior Notes 2.51% [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 25,000,000 |  |  | 25,000,000 |  |  |
Stated interest rate |  | 2.51% |  |  |  |  |  |
Variable Rate Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 0 |  |  | $ 0 |  |  |
Unsecured Private Placement, Debt Shell Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of debt instruments | debt_instrument |  | 2 |  |  |  |  |  |
Debt Shelf Facility Prudential [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 100,000,000 | $ 75,000,000 |
Debt Shelf Facility Metlife [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 100,000,000 | $ 100,000,000 |  |  |  |  |  | $ 100,000,000
Debt instrument, issuance period | 3 years |  |  |  |  |  |  |

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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 + Details
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