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DEBT - CREDIT FACILITIES (Details) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 21, 2018 USD ($) | Jun. 30, 2019 USD ($) Mutual_option | Dec. 05, 2018 USD ($) | Sep. 30, 2018 USD ($)
Revolving Line of Credit, 4 Months |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank revolving credit facilities |  | $ 100,000,000 |  |  |  |  |
Debt instrument, term |  | 4 months |  |  |  |  |
NJR | Letter of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  | $ 4,200,000 |  |  | $ 14,900,000 |
NJR | Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount outstanding at end of period |  |  | $ 0 |  |  | $ 87,950,000 |
Weighted average interest rate at end of period |  |  | 0.00% |  |  | 3.07% |
NJR | Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount available at end of period | [1] |  | $ 420,775,000 |  |  | $ 322,144,000 |
Debt, expiration, mutual options | Mutual_option |  |  | 2 |  |  |  |
Debt, expiration, extension term |  |  | 1 year |  |  |  |
Line of credit facility, maximum borrowing capacity, incremental increase |  |  | $ 50,000,000 |  |  |  |
Line of credit facility, maximum borrowing capacity, maximum increase |  |  | 250,000,000 |  |  |  |
NJR | Revolving Credit Facility | Committed Credit Facilities Due December 2023 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank revolving credit facilities |  |  | 425,000,000 | [2] | $ 425,000,000 | 425,000,000 | [2]
NJNG | Commercial Paper |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount outstanding at end of period |  |  | $ 99,300,000 |  |  | $ 64,000,000 |
Weighted average interest rate at end of period |  |  | 2.62% |  |  | 2.18% |
Amount available at end of period | [3] |  | $ 149,969,000 |  |  | $ 185,269,000 |
NJNG | Letter of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  | $ 731,000 |  |  | 731,000 |
NJNG | Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt, expiration, mutual options | Mutual_option |  |  | 2 |  |  |  |
Debt, expiration, extension term |  |  | 1 year |  |  |  |
Line of credit facility, maximum borrowing capacity, incremental increase |  |  | $ 50,000,000 |  |  |  |
Line of credit facility, maximum borrowing capacity, maximum increase |  |  | 100,000,000 |  |  |  |
NJNG | Revolving Credit Facility | Committed Credit Facilities Due December 2023 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank revolving credit facilities |  |  |  |  | $ 250,000,000 |  |
NJNG | Revolving Credit Facility | Committed Credit Facilities Due May 2019 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank revolving credit facilities | [2] |  | $ 250,000,000 |  |  | $ 250,000,000 |
[1] | Letters of credit outstanding total $4.2 million and $14.9 million for June 30, 2019 and September 30, 2018, respectively, which reduces amount available by the same amount.
[2] | Committed credit facilities, which require commitment fees on the unused amounts.
[3] | Letters of credit outstanding total $731,000 for both June 30, 2019 and September 30, 2018, which reduces the amount available by the same amount.

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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 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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- 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://fasb.org/us-gaap/role/ref/legacyRef -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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