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DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 21, 2016 | Mar. 22, 2016
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 1,180,619 | $ 997,080 |  |
Natural Gas Distribution |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs | (6,515) | (6,262) |  |
Less: Current maturities of long-term debt | (9,502) | (135,800) |  |
Total long-term debt | 691,965 | 569,642 |  |
Natural Gas Distribution | First mortgage bonds: | Series LL |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 0 | 125,000 |  |
Natural Gas Distribution | First mortgage bonds: | Series MM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 9,545 | 9,545 |  |
Natural Gas Distribution | First mortgage bonds: | Series NN |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 41,000 | 41,000 |  |
Natural Gas Distribution | First mortgage bonds: | Series OO |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 46,500 | 46,500 |  |
Natural Gas Distribution | First mortgage bonds: | Series PP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 50,000 | 50,000 |  |
Stated interest rate | 3.15% |  |  |
Natural Gas Distribution | First mortgage bonds: | Series QQ |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 70,000 | 70,000 |  |
Stated interest rate | 3.58% |  |  |
Natural Gas Distribution | First mortgage bonds: | Series RR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 55,000 | 55,000 |  |
Stated interest rate | 4.61% |  |  |
Natural Gas Distribution | First mortgage bonds: | Series SS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 50,000 | 50,000 |  |
Stated interest rate | 2.82% |  |  |
Natural Gas Distribution | First mortgage bonds: | Series TT |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 100,000 | 100,000 |  |
Stated interest rate | 3.66% |  |  |
Natural Gas Distribution | First mortgage bonds: | Series UU |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 125,000 | 125,000 |  |
Stated interest rate | 3.63% |  | 3.63% |
Natural Gas Distribution | First mortgage bonds: | Series VV |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 125,000 | 0 |  |
Stated interest rate | 4.01% |  |  |
Natural Gas Distribution | Capital lease obligations | Capital lease obligation-buildings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 8,749 | 11,617 |  |
Natural Gas Distribution | Capital lease obligations | Capital lease obligation-meters |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 27,188 | 28,042 |  |
NJR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs | (1,136) | (770) |  |
Less: Current maturities of long-term debt | (100,000) | (25,000) |  |
Total long-term debt | 398,864 | 399,230 |  |
NJR | Unsecured senior notes 2.51% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 0 | 25,000 |  |
Stated interest rate | 2.51% |  |  |
NJR | Unsecured senior notes 3.25% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 50,000 | 50,000 |  |
Stated interest rate | 3.25% |  |  |
NJR | Unsecured senior notes 3.48% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 100,000 | 100,000 |  |
Stated interest rate | 3.48% |  |  |
NJR | Unsecured senior notes 3.20% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 50,000 | 50,000 |  |
Stated interest rate |  |  |  | 3.20%
NJR | Unsecured senior notes 3.54% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 100,000 | 100,000 |  |
Stated interest rate |  |  |  | 3.54%
NJR | Unsecured senior notes 3.96% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 100,000 | 0 |  |
Stated interest rate |  |  |  | 3.96%
NJR | Term loan | Credit Agreement Due August 16, 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 100,000 | 100,000 |  |
Clean Energy Ventures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 103,923 | 32,790 |  |
Less: Current maturities of long-term debt | (14,133) | (4,582) |  |
Long-term debt, excluding current maturities | $ 89,790 | $ 28,208 |  |

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