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DEBT - FIRST MORTGAGE BONDS (Details) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 13, 2018 USD ($) | Jan. 17, 2017 USD ($) First_mortgage_bond | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Jun. 21, 2016 | Jun. 01, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
NJBPU dividend restriction, equity to capitalization ratio |  |  | 0.3 |  |  |  |
Debt to equity ratio |  |  | 0.567 |  |  |  |
Number of first mortgage bonds completed | First_mortgage_bond |  | 3 |  |  |  |  |
Payment of long-term debt |  |  | $ 165,486 | $ 97,854 | $ 13,289 |  |
Variable Rate Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  | 97,000 |  |  |  |
First mortgage bonds: |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount that can be issued |  |  | 1,000,000 |  |  |  |
Natural Gas Distribution | Series LL |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  | $ 125,000 |  |  |  |
Stated interest rate |  |  | 5.60% |  |  |  |
Natural Gas Distribution | First mortgage bonds: |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payment of long-term debt |  | $ 35,800 |  |  |  |  |
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 | First mortgage bonds: | Series LL |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  | $ 0 | $ 125,000 |  |  |
Natural Gas Distribution | Variable demand rate notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate on EDA Bonds |  |  | 2.03% |  |  |  |
Natural Gas Distribution | Minimum | First mortgage bonds: | Series II |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 4.50% |  |  |  |  |
Natural Gas Distribution | Maximum | First mortgage bonds: | Series II |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 4.90% |  |  |  |  |
Treasury lock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 4.01%
Fixed treasury rate |  |  |  |  |  |  | 3.26%
Amount of gain (loss) recognized in income on derivatives | $ 2,600 |  |  |  |  |  |

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