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DEBT - LONG TERM DEBT (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 18, 2019 USD ($) First_mortgage_bond | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Aug. 15, 2019 USD ($) | Jul. 17, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transaction |  |  |  |  | $ 9,895,000 | $ 7,820,000 |  |
NJNG |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transaction |  | $ 9,900,000 | $ 7,800,000 |  |  |  |  |
Remaining principal payments |  |  |  | $ 1,100,000 |  | $ 1,100,000 |  |
Number of first mortgage bonds | First_mortgage_bond | 3 |  |  |  |  |  |  |
Proceeds from reissuance of first mortgage bond | $ 35,800,000 |  |  |  |  |  |  |
NJNG | First Mortgage Bond |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate | 3.02% |  |  |  |  |  |  |
NJR | Unsecured Senior Note | Scenario, Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 100,000,000 |
Subsequent Event | NJNG | Unsecured Senior Note 3.76% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 100,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  | 3.76%
Subsequent Event | NJNG | Unsecured Senior Note 3.86% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 85,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  | 3.86%
Subsequent Event | NJR | Unsecured Senior Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 50,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  | 3.29%

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 4: 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 + Details
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- Definition The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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