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DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Finance lease liabilities | $ 63,743 |
Total long-term debt | 2,259,466 | $ 1,537,177
NJNG |  |
Debt Instrument [Line Items] |  |
Less: Debt issuance costs | (9,195) | (9,027)
Less: Current maturities of long-term debt | (10,416) | (10,420)
Total long-term debt | 1,147,393 | 908,779
NJNG | Finance lease obligation-buildings |  |
Debt Instrument [Line Items] |  |
Finance lease liabilities | 47,597 | 5,637
NJNG | Finance lease obligation-meters |  |
Debt Instrument [Line Items] |  |
Finance lease liabilities | $ 26,562 | 29,744
NJNG | First mortgage bonds: | Series OO |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.00% |
Long-term debt | $ 46,500 | 46,500
NJNG | First mortgage bonds: | Series PP |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.15% |
Long-term debt | $ 50,000 | 50,000
NJNG | First mortgage bonds: | Series QQ |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.58% |
Long-term debt | $ 70,000 | 70,000
NJNG | First mortgage bonds: | Series RR |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.61% |
Long-term debt | $ 55,000 | 55,000
NJNG | First mortgage bonds: | Series SS |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.82% |
Long-term debt | $ 50,000 | 50,000
NJNG | First mortgage bonds: | Series TT |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.66% |
Long-term debt | $ 100,000 | 100,000
NJNG | First mortgage bonds: | Series UU |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.63% |
Long-term debt | $ 125,000 | 125,000
NJNG | First mortgage bonds: | Series VV |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.01% |
Long-term debt | $ 125,000 | 125,000
NJNG | First mortgage bonds: | Series WW |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.50% |
Long-term debt | $ 10,300 | 10,300
NJNG | First mortgage bonds: | Series XX |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.38% |
Long-term debt | $ 10,500 | 10,500
NJNG | First mortgage bonds: | Series YY |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.45% |
Long-term debt | $ 15,000 | 15,000
NJNG | First mortgage bonds: | Series ZZ |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.76% |
Long-term debt | $ 100,000 | 100,000
NJNG | First mortgage bonds: | Series AAA |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.86% |
Long-term debt | $ 85,000 | 85,000
NJNG | First mortgage bonds: | Series BBB |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.75% |
Long-term debt | $ 9,545 | 9,545
NJNG | First mortgage bonds: | Series CCC |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.00% |
Long-term debt | $ 41,000 | 41,000
NJNG | First mortgage bonds: | Series DDD |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.13% |
Long-term debt | $ 50,000 | 0
NJNG | First mortgage bonds: | Series EEE |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.13% |
Long-term debt | $ 50,000 | 0
NJNG | First mortgage bonds: | Series FFF |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.33% |
Long-term debt | $ 25,000 | 0
NJNG | First mortgage bonds: | Series GGG |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.87% |
Long-term debt | $ 25,000 | 0
NJNG | First mortgage bonds: | Series HHH |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.97% |
Long-term debt | $ 50,000 | 0
NJR |  |
Debt Instrument [Line Items] |  |
Less: Debt issuance costs | (3,424) | (2,004)
Less: Current maturities of long-term debt | 0 | 0
Total long-term debt | $ 1,006,576 | 547,996
NJR | Unsecured senior notes 3.25% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.25% |
Long-term debt | $ 50,000 | 50,000
NJR | Unsecured senior notes 3.20% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.20% |
Long-term debt | $ 50,000 | 50,000
NJR | Unsecured senior notes 3.48% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.48% |
Long-term debt | $ 100,000 | 100,000
NJR | Unsecured senior notes 3.54% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.54% |
Long-term debt | $ 100,000 | 100,000
NJR | Unsecured senior notes 3.96% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.96% |
Long-term debt | $ 100,000 | 100,000
NJR | Unsecured senior notes 3.29% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.29% |
Long-term debt | $ 150,000 | 150,000
NJR | Unsecured senior note 3.60% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.60% |
Long-term debt | $ 130,000 | 0
NJR | Unsecured senior note 3.5% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.50% |
Long-term debt | $ 130,000 | 0
NJR | Unsecured senior notes 3.25% |  |
Debt Instrument [Line Items] |  |
Long-term debt |  | 0
NJR | Unsecured senior note 3.13% |  |
Debt Instrument [Line Items] |  |
Long-term debt |  | 0
Clean Energy Ventures |  |
Debt Instrument [Line Items] |  |
Long-term debt | 122,317 | 91,401
Less: Current maturities of long-term debt | (16,820) | (10,999)
Total Clean Energy Ventures long-term debt | $ 105,497 | $ 80,402

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