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DEBT, SHORT-TERM BANK FACILITIES (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
NJR | Letters of credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Letters of credit outstanding, amount |  | $ 14,400,000 |  | $ 16,500,000 |
NJR | Notes payable to banks |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Outstanding at end of period |  | $ 121,700,000 |  | $ 39,350,000 |
Weighted average interest rate at end of period |  | 1.43% |  | 1.17% |
Amount available at end of period | [1] | $ 288,910,000 |  | $ 369,176,000 |
NJR | Bank revolving credit facilities |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Amount available at end of period |  | 0 |  | 100,000,000 |
NJR | Committed Credit Facilities Due September 2020 | Bank revolving credit facilities |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Bank revolving credit facilities | [2] | $ 425,000,000 |  | $ 425,000,000 |
NJR | Bank revolving credit facilities |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Commitment fee percentage |  | 0.075% |  | 0.075% |
NJR | Uncommitted Credit Facilities | Bank revolving credit facilities |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Bank revolving credit facilities | [3] | $ 0 |  | $ 100,000,000 |
NJNG | Commercial paper |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Outstanding at end of period |  | $ 0 |  | $ 27,000,000 |
Weighted average interest rate at end of period |  | 0.00% |  | 0.20% |
Amount available at end of period | [4] | $ 249,269,000 |  | $ 222,269,000 |
NJNG | Letters of credit |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Letters of credit outstanding, amount |  | $ 731,000 |  | 731,000 |
NJNG | Bank revolving credit facilities |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Commitment fee percentage |  | 0.075% |  |  |
NJNG | Committed Credit Facilities Due May 2019 | Bank revolving credit facilities |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Bank revolving credit facilities |  | $ 250,000,000 | [2] | $ 250,000,000 | [5]
[1] | Letters of credit outstanding total $14.4 million and $16.5 million as of September 30, 2016 and 2015, respectively, which reduces amount available by the same amount.
[2] | Committed credit facilities, which require commitment fees of .075 percent on the unused amounts.
[3] | Uncommitted credit facilities, which require no commitment fees.
[4] | Letters of credit outstanding total $731,000 as of September 30, 2016 and 2015, which reduces amount available by the same amount.
[5] | Committed credit facilities, which require commitment fees of .075 percent on the unused amounts.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 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 + Details
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