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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) | Mar. 13, 2018 | Mar. 31, 2018 | Jan. 26, 2018 | Sep. 30, 2017 | Aug. 18, 2017 | Jun. 01, 2015
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Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  | 3.26%
Notional amount of foreign currency derivatives |  |  |  |  |  | $ 125,000,000
Fair Value |  |  |  |  |  |
Derivative assets, current |  | $ 26,897,000 |  | $ 30,081,000 |  |
Derivative liabilities, current |  | 44,792,000 |  | 46,544,000 |  |
Derivative assets, noncurrent |  | 13,616,000 |  | 9,164,000 |  |
Derivative liabilities, noncurrent |  | 23,603,000 |  | 11,330,000 |  |
Derivative assets |  | 40,513,000 |  | 39,245,000 |  |
Derivative liabilities |  | 68,395,000 |  | 57,874,000 |  |
Foreign currency contracts |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Notional amount of foreign currency derivatives |  | 8,800,000 |  |  |  |
Treasury Lock |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  | 3.26%
Notional amount of foreign currency derivatives |  |  |  |  |  | $ 125,000,000
Treasury lock settlement, loss | $ 2,600,000 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |
Fair Value |  |  |  |  |  |
Derivative assets, current |  | 88,000 |  | 151,000 |  |
Derivative liabilities, current |  | 26,000 |  | 72,000 |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |
Fair Value |  |  |  |  |  |
Derivative assets, current |  | 375,000 |  | 0 |  |
Derivative liabilities, current |  | 134,000 |  | 1,149,000 |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |
Fair Value |  |  |  |  |  |
Derivative assets, current |  | 0 |  | 0 |  |
Derivative liabilities, current |  | 0 |  | 8,467,000 |  |
Natural Gas Distribution | Series Ll |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Debt issued |  | $ 125,000,000 |  |  |  |
Interest rate, stated percentage |  | 5.60% |  |  |  |
Energy Services | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |
Fair Value |  |  |  |  |  |
Derivative assets, current |  | $ 6,036,000 |  | 14,588,000 |  |
Derivative liabilities, current |  | 16,274,000 |  | 16,589,000 |  |
Derivative assets, noncurrent |  | 1,249,000 |  | 7,127,000 |  |
Derivative liabilities, noncurrent |  | 14,963,000 |  | 8,710,000 |  |
Energy Services | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |
Fair Value |  |  |  |  |  |
Derivative assets, current |  | 20,398,000 |  | 15,302,000 |  |
Derivative liabilities, current |  | 28,247,000 |  | 20,267,000 |  |
Derivative assets, noncurrent |  | 12,232,000 |  | 2,033,000 |  |
Derivative liabilities, noncurrent |  | 8,537,000 |  | 2,620,000 |  |
Energy Services | Not Designated as Hedging Instrument | Foreign currency contracts |  |  |  |  |  |
Fair Value |  |  |  |  |  |
Derivative assets, current |  | 0 |  | 40,000 |  |
Derivative liabilities, current |  | 97,000 |  | 0 |  |
Derivative assets, noncurrent |  | 0 |  | 4,000 |  |
Derivative liabilities, noncurrent |  | 103,000 |  | 0 |  |
Home Services and Other | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |
Fair Value |  |  |  |  |  |
Derivative assets, noncurrent |  | 135,000 |  | 0 |  |
Derivative liabilities, noncurrent |  | 0 |  | 0 |  |
Home Services and Other | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |
Fair Value |  |  |  |  |  |
Derivative assets, current |  | 0 |  | 0 |  |
Derivative liabilities, current |  | $ 14,000 |  | $ 0 |  |
Term Loan | Credit Agreement Due August 16, 2019 |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Debt issued |  |  |  |  | $ 100,000,000 |
Weighted average interest rate at end of period |  |  | 2.84% |  |  |

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