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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 01, 2015
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Fixed treasury rate |  |  | 3.26%
Notional amount of foreign currency derivatives |  |  | $ 125,000
Asset Derivatives, current | $ 30,081 | $ 29,964 |
Asset Derivatives, noncurrent | 9,164 | 5,227 |
Asset Derivatives | 39,245 | 35,191 |
Liability Derivatives, current | 46,544 | 61,080 |
Liability Derivatives, noncurrent | 11,330 | 25,252 |
Liability Derivatives | 57,874 | 86,332 |
Physical commodity contracts | Natural Gas Distribution | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 151 | 235 |
Liability Derivatives, current | 72 | 1,154 |
Physical commodity contracts | Energy Services | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 14,588 | 5,994 |
Asset Derivatives, noncurrent | 7,127 | 3,987 |
Liability Derivatives, current | 16,589 | 11,660 |
Liability Derivatives, noncurrent | 8,710 | 1,212 |
Financial commodity contracts | Natural Gas Distribution | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 0 | 805 |
Asset Derivatives, noncurrent | 0 | 75 |
Liability Derivatives, current | 1,149 | 2,979 |
Liability Derivatives, noncurrent | 0 | 386 |
Financial commodity contracts | Energy Services | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 15,302 | 22,929 |
Asset Derivatives, noncurrent | 2,033 | 1,165 |
Liability Derivatives, current | 20,267 | 45,255 |
Liability Derivatives, noncurrent | 2,620 | 581 |
Interest rate contracts | Natural Gas Distribution | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 0 | 0 |
Asset Derivatives, noncurrent | 0 | 0 |
Liability Derivatives, current | 8,467 | 0 |
Liability Derivatives, noncurrent | 0 | 23,073 |
Foreign currency contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amount of foreign currency derivatives | 4,500 |  |
Foreign currency contracts | Energy Services | Derivatives not designated as hedging instruments: |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives, current | 40 | 1 |
Asset Derivatives, noncurrent | 4 | 0 |
Liability Derivatives, current | 0 | 32 |
Liability Derivatives, noncurrent | 0 | $ 0 |
Series LL | Natural Gas Distribution |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Long-term debt | $ 125,000 |  |
Stated interest rate | 5.60% |  |

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