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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands | Mar. 13, 2018 | Jun. 30, 2018 | May 11, 2018 | Jan. 26, 2018 | Sep. 30, 2017 | Aug. 18, 2017 | Jun. 01, 2015
--- | --- | --- | --- | --- | --- | --- | ---
Fair Value |  |  |  |  |  |  |
Derivative assets, current |  | $ 23,192 |  |  | $ 30,081 |  |
Derivative liabilities, current |  | 43,398 |  |  | 46,544 |  |
Derivative assets, noncurrent |  | 11,886 |  |  | 9,164 |  |
Derivative liabilities, noncurrent |  | 21,604 |  |  | 11,330 |  |
Derivative assets |  | 35,078 |  |  | 39,245 |  |
Derivative liabilities |  | 65,002 |  |  | 57,874 |  |
Foreign currency contracts |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Notional amount of foreign currency derivatives |  | 7,900 |  |  |  |  |
Treasury Lock |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  |  | 3.26%
Notional amount of foreign currency derivatives |  |  |  |  |  |  | $ 125,000
Treasury lock settlement, loss | $ 2,600 |  |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |
Derivative assets, current |  | 57 |  |  | 151 |  |
Derivative liabilities, current |  | 286 |  |  | 72 |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |
Derivative assets, current |  | 323 |  |  | 0 |  |
Derivative liabilities, current |  | 117 |  |  | 1,149 |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |
Derivative assets, current |  | 0 |  |  | 0 |  |
Derivative liabilities, current |  | 0 |  |  | 8,467 |  |
Natural Gas Distribution | Series Ll |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Debt issued |  | $ 125,000 |  |  |  |  |
Interest rate, stated percentage |  | 5.60% |  |  |  |  |
Energy Services | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |
Derivative assets, current |  | $ 6,847 |  |  | 14,588 |  |
Derivative liabilities, current |  | 17,660 |  |  | 16,589 |  |
Derivative assets, noncurrent |  | 2,474 |  |  | 7,127 |  |
Derivative liabilities, noncurrent |  | 13,267 |  |  | 8,710 |  |
Energy Services | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |
Derivative assets, current |  | 15,728 |  |  | 15,302 |  |
Derivative liabilities, current |  | 25,151 |  |  | 20,267 |  |
Derivative assets, noncurrent |  | 9,324 |  |  | 2,033 |  |
Derivative liabilities, noncurrent |  | 8,163 |  |  | 2,620 |  |
Energy Services | Not Designated as Hedging Instrument | Foreign currency contracts |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |
Derivative assets, current |  | 0 |  |  | 40 |  |
Derivative liabilities, current |  | 184 |  |  | 0 |  |
Derivative assets, noncurrent |  | 0 |  |  | 4 |  |
Derivative liabilities, noncurrent |  | 174 |  |  | 0 |  |
Home Services and Other | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |
Derivative assets, noncurrent |  | 88 |  |  | 0 |  |
Derivative liabilities, noncurrent |  | 0 |  |  | 0 |  |
Home Services and Other | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |
Derivative assets, current |  | 237 |  |  | 0 |  |
Derivative liabilities, current |  | $ 0 |  |  | $ 0 |  |
Term Loan | Credit Agreement Due August 16, 2019 |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 100,000 |
Weighted average interest rate at end of period |  |  |  | 2.84% |  |  |
Natural Gas Distribution | Senior Notes | 4.01% Senior Notes Due May 11, 2048 |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  | 4.01% |  |  |  |

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