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DEBT - CREDIT FACILITIES (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Jan. 19, 2018 | Dec. 14, 2017 | Sep. 30, 2017
Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit outstanding, amount |  |  |  | $ 13,400,000
Revolving Credit Facility | Line Of Credit Facility Due April 14, 2018 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Term of line of credit facility | 4 months |  |  |
Line of credit facility, amount outstanding | $ 0 |  |  |
NJR | Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit outstanding, amount | 11,000,000 |  |  |
NJR | Notes |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount outstanding at end of period | $ 327,200,000 |  |  | $ 255,000,000
Weighted average interest rate at end of period | 2.26% |  |  | 2.14%
Amount available at end of period | $ 86,834,000 |  |  | $ 156,601,000
NJR | Committed Credit Facilities Due April 2018 | Notes |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount available at end of period | 75,000,000 |  |  | 0
NJR | Revolving Credit Facility | Committed Credit Facilities Due September 2020 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank revolving credit facilities | 425,000,000 |  |  | 425,000,000
NJR | Revolving Credit Facility | Committed Credit Facilities Due April 2018 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank revolving credit facilities | 75,000,000 |  | $ 75,000,000 | 0
Natural Gas Distribution | Commercial Paper |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount outstanding at end of period | $ 46,000,000 |  |  | $ 11,000,000
Weighted average interest rate at end of period | 1.33% |  |  | 1.13%
Amount available at end of period | $ 203,269,000 |  |  | $ 238,269,000
Natural Gas Distribution | Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit outstanding, amount | 731,000 |  |  | 731,000
Natural Gas Distribution | Revolving Credit Facility | Committed Credit Facilities Due May 2019 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank revolving credit facilities | $ 250,000,000 |  |  | $ 250,000,000
Subsequent Event | Revolving Credit Facility | Line Of Credit Facility Due April 14, 2018 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank revolving credit facilities |  | $ 100,000,000 |  |

X
- 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 The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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X
- 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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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + 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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