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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 26, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, current |  | $ 27,396 |  | $ 30,081
Asset Derivatives, noncurrent |  | 10,560 |  | 9,164
Liability Derivatives, current |  | 46,652 |  | 46,544
Liability Derivatives, noncurrent |  | 22,982 |  | 11,330
Derivatives not designated as hedging instruments: |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives |  | 37,956 |  | 39,245
Liability Derivatives |  | 69,634 |  | 57,874
Interest rate swap |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fixed treasury rate |  |  | 2.84% |
Term loan | Credit Agreement Due August 16, 2019 | Interest rate swap |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Long-term debt |  |  | $ 100,000 |
Home Services and Other | Interest rate contract | Derivatives not designated as hedging instruments: |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, current |  | 381 |  | 0
Liability Derivatives, current |  | 0 |  | 0
Natural Gas Distribution | Physical commodity contracts | Derivatives not designated as hedging instruments: |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, current |  | 85 |  | 151
Liability Derivatives, current |  | 192 |  | 72
Natural Gas Distribution | Financial commodity contracts | Derivatives not designated as hedging instruments: |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, current |  | 94 |  | 0
Liability Derivatives, current |  | 0 |  | 1,149
Natural Gas Distribution | Interest rate contract | Derivatives not designated as hedging instruments: |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, current | [1] | 0 |  | 0
Liability Derivatives, current | [1] | 0 |  | 8,467
Energy Services | Physical commodity contracts | Derivatives not designated as hedging instruments: |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, current |  | 7,667 |  | 14,588
Asset Derivatives, noncurrent |  | 3,930 |  | 7,127
Liability Derivatives, current |  | 18,158 |  | 16,589
Liability Derivatives, noncurrent |  | 11,316 |  | 8,710
Energy Services | Financial commodity contracts | Derivatives not designated as hedging instruments: |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, current |  | 19,169 |  | 15,302
Asset Derivatives, noncurrent |  | 6,630 |  | 2,033
Liability Derivatives, current |  | 28,176 |  | 20,267
Liability Derivatives, noncurrent |  | 11,548 |  | 2,620
Energy Services | Foreign currency contracts | Derivatives not designated as hedging instruments: |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, current |  | 0 |  | 40
Asset Derivatives, noncurrent |  | 0 |  | 4
Liability Derivatives, current |  | 126 |  | 0
Liability Derivatives, noncurrent |  | $ 118 |  | $ 0
[1] | Includes treasury lock which was settled in March 2018. See Note 8. Debt for more information.

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