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DEBT, CREDIT FACILITIES (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 NJR [Member] Unsecured senior note 3.25% [Member] | Sep. 30, 2013 NJR [Member] Unsecured senior note 3.25% [Member] | Sep. 30, 2014 NJR [Member] Unsecured senior note 1.94% [Member] | Sep. 30, 2013 NJR [Member] Unsecured senior note 1.94% [Member] | Sep. 30, 2014 NJR [Member] Unsecured senior note 2.51% [Member] | Sep. 30, 2013 NJR [Member] Unsecured senior note 2.51% [Member] | Sep. 30, 2014 NJR [Member] Unsecured senior notes [Member] debt_instrument | Sep. 30, 2014 NJR [Member] Letter of Credit [Member] debt_instrument | Sep. 30, 2013 NJR [Member] Letter of Credit [Member] | Sep. 30, 2014 NJR [Member] Letters of Credit on Behalf of NJRES [Member] debt_instrument | Sep. 30, 2014 NJR [Member] Letter of Credit on Behalf of NJRCEV [Member] debt_instrument | Sep. 30, 2013 NJR [Member] Unsecured Private Placement, Debt Shell Facility [Member] debt_instrument | Sep. 26, 2013 NJR [Member] Debt Shelf Facility MetLife [Member] | Sep. 30, 2014 NJR [Member] Debt Shelf Facility MetLife [Member] | Sep. 26, 2013 NJR [Member] Debt Shelf Facility MetLife [Member] | Sep. 30, 2014 NJR [Member] Debt Shelf Facility Prudential [Member] | Jun. 30, 2014 NJR [Member] Debt Shelf Facility Prudential [Member] | Sep. 30, 2014 NJR [Member] Bank Credit Facilities Short term [Member] | Sep. 30, 2013 NJR [Member] Bank Credit Facilities Short term [Member] | Sep. 30, 2013 NJR [Member] JPMC Term Loan [Member] | Sep. 30, 2014 NJR [Member] JPMC Term Loan [Member] | Jan. 24, 2014 NJR [Member] JPMC Term Loan [Member] | Sep. 30, 2014 NJNG [Member] Commercial Paper [Member] | Sep. 30, 2013 NJNG [Member] Commercial Paper [Member] | Sep. 30, 2014 NJNG [Member] Letter of Credit [Member] debt_instrument | Sep. 30, 2013 NJNG [Member] Letter of Credit [Member] | Sep. 30, 2014 NJNG [Member] Bank Credit Facilities Short term [Member] | Sep. 30, 2013 NJNG [Member] Bank Credit Facilities Short term [Member] | Oct. 24, 2014 NJNG [Member] Bank Credit Facilities, Santander Bank [Member] Subsequent Event [Member] | Sep. 30, 2013 NJNG [Member] Bank Credit Facilities, EDA Bonds [Member] | Sep. 30, 2014 NJNG [Member] Bank Credit Facilities, EDA Bonds [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 0 | [1],[2] | $ 10,000,000 | [1],[2] |  |  |  |  | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 75,000,000 | $ 425,000,000 | [3] | $ 325,000,000 | [3] |  |  |  |  |  |  |  |  |  | $ 250,000,000 | [3] | $ 250,000,000 | [3] | $ 100,000,000 | $ 100,000,000 | [1],[3] | $ 0 | [1],[3]
Line of credit facility, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 148,000,000 |  | 97,000,000 |  | 100,000,000 | 0 |  | 153,000,000 |  | 168,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate at end of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.08% |  | 1.00% |  | 0.74% | 0.00% |  | 0.12% |  | 0.13% |  |  |  |  |  |  |  |  |  |  |  |
Amount available at end of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 256,484,000 | [4] | 210,110,000 | [4] | 0 | 0 |  | 96,269,000 | [5] | 81,400,000 | [5] |  |  |  |  |  |  |  |  |  |  |
Bank term loan | 301,000,000 | 365,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 0 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  |  | 20,500,000 |  | 17,900,000 |  | 15,000,000 | 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 731,000 | 266,000 |  |  |  |  |  |  |  |  |
Number of debt instruments |  |  |  |  |  |  |  |  | 2 | 6 |  |  |  | 1 | 5 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Debt instrument, issuance period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 50,000,000 | 50,000,000 | 25,000,000 | 25,000,000 | 25,000,000 | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.25% |  | 1.94% |  | 2.51% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  | 5 years |  |  |  |  | 4 years |  |  |
Line of credit facility, maximum borrowing capacity, incremental increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity, maximum increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
[1] | There were no borrowings outstanding as of September 30, 2014 and 2013, respectively.
[2] | Uncommitted, expired on June 5, 2014.
[3] | Committed credit facilities, which require commitment fees on the unused amounts.
[4] | Letters of credit outstanding total $20.5 million and $17.9 million as of September 30, 2014 and 2013, respectively, which reduces amount available by the same amount.
[5] | Letters of credit outstanding total $731,000 and $266,000 as of September 30, 2014 and 2013, respectively, which reduces amount available by the same amount.

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 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 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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