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DERIVATIVE INSTRUMENTS, BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 01, 2015
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Fixed treasury rate |  |  | 3.26%
Notional amount of foreign currency derivatives |  |  | $ 125,000
Asset Derivatives, current | $ 29,964 | $ 40,743 |
Asset Derivatives, noncurrent | 5,227 | 4,334 |
Asset Derivatives | 35,191 | 45,087 |
Liability Derivatives, current | 61,080 | 32,791 |
Liability Derivatives, noncurrent | 25,252 | 5,529 |
Liability Derivatives | 86,332 | 38,330 |
Physical commodity contracts | NJNG | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 235 | 0 |
Liability Derivatives, current | 1,154 | 0 |
Physical commodity contracts | NJRES | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 5,994 | 4,854 |
Asset Derivatives, noncurrent | 3,987 | 1,718 |
Liability Derivatives, current | 11,660 | 9,281 |
Liability Derivatives, noncurrent | 1,212 | 0 |
Financial commodity contracts | NJNG | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 805 | 207 |
Asset Derivatives, noncurrent | 75 | 0 |
Liability Derivatives, current | 2,979 | 10,163 |
Liability Derivatives, noncurrent | 386 | 925 |
Financial commodity contracts | NJRES | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 22,929 | 35,682 |
Asset Derivatives, noncurrent | 1,165 | 2,626 |
Liability Derivatives, current | 45,255 | 13,347 |
Liability Derivatives, noncurrent | 581 | 386 |
Interest rate contracts | NJNG | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, noncurrent | 0 | 0 |
Liability Derivatives, noncurrent | 23,073 | 4,228 |
Foreign currency contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amount of foreign currency derivatives | 3,600 |  |
Foreign currency contracts | NJRES | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 1 | 0 |
Liability Derivatives, current | 32 | 0 |
First mortgage bonds: | Series LL | NJNG |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Long-term debt | $ 125,000 | $ 125,000 |
Stated interest rate | 5.60% |  |

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