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DEBT, NJR SHORT-TERM DEBT (Details) | Sep. 15, 2014 USD ($) | Apr. 23, 2014 | Oct. 24, 2015 USD ($) | Sep. 30, 2015 USD ($) debt_instrument | Sep. 28, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 05, 2014 USD ($) | Jan. 31, 2014 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 3 years |  |  |  |  |  |
Bank term loan |  |  |  |  | $ 66,350,000 |  | $ 301,000,000 |  |
NJR [Member] | Bank Revolving Credit Facilities [Member] |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | [1] |  |  |  |  | $ 425,000,000 | 425,000,000 |  | $ 325,000,000
NJR [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | [2] |  |  |  | $ 100,000,000 |  | 0 |  |
Debt instrument, term |  | 1 year |  |  |  |  |  |  |
Bank term loan |  | $ 100,000,000 |  |  |  |  |  |  |
NJR [Member] | Bank Credit Facilities, Santander Bank [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 100,000,000 |  |  |  |  |
NJR [Member] | Letters of Credit [Member] |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | [2],[3] |  |  |  |  |  |  | $ 10,000,000 |
Number of debt instruments | debt_instrument |  |  |  |  | 6 |  |  |  |
Letters of credit outstanding, amount |  |  |  |  | $ 16,500,000 |  | $ 20,500,000 |  |
NJR [Member] | Letters of Credit on Behalf of NJRES [Member] |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  | 1 |  |  |  |
Letters of credit outstanding, amount |  |  |  |  | $ 12,000,000 |  |  |  |
NJR [Member] | Letters of Credit on Behalf of NJRCEV [Member] |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  | 5 |  |  |  |
Letters of credit outstanding, amount |  |  |  |  | $ 4,500,000 |  |  |  |
[1] | Committed credit facilities, which require commitment fees of .075 percent and .1 percent on the unused amounts as of September 30, 2015 and 2014, respectively.
[2] | Uncommitted credit facilities, which require no commitment fees.
[3] | Committed credit facilities, which require commitment fees of .075 percent on the unused amounts.

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- Definition Number of Debt Instruments + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + 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 210.9-03.13) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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