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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 13, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | May 30, 2018 | May 15, 2018 | May 11, 2018 | Jan. 31, 2018 | Jun. 30, 2015
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | $ 28,337 |  | $ 28,337 |  | $ 27,396 |  |  |  |  |
Derivative liabilities, current |  | 40,677 |  | 40,677 |  | 46,652 |  |  |  |  |
Derivative assets, noncurrent |  | 14,476 |  | 14,476 |  | 10,560 |  |  |  |  |
Derivative liabilities, noncurrent |  | 24,923 |  | 24,923 |  | 22,982 |  |  |  |  |
Treasury lock |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  |  |  |  |  |  | 3.26%
Interest rate, stated percentage |  |  |  |  |  |  |  |  | 4.01% |  |
Gain (loss) on derivative, net | $ (2,600) |  |  |  |  |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  |  |  |  |  | 2.84% |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 26,740 | $ (2,752) | 17,656 | $ (93,209) |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | 42,813 |  | 42,813 |  | 37,956 |  |  |  |  |
Derivative liabilities |  | 65,600 |  | 65,600 |  | 69,634 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | (9,556) | 3,128 | (1,904) | (5,836) |  |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 812 | (178) | 5,225 | (16,033) |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 55 |  | 55 |  | 85 |  |  |  |  |
Derivative liabilities, current |  | 62 |  | 62 |  | 192 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | (10,368) | 3,306 | (7,129) | 1,730 |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 216 |  | 216 |  | 94 |  |  |  |  |
Derivative liabilities, current |  | 19 |  | 19 |  | 0 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 0 | $ 0 | 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 |  | 7,874 |  | 7,874 |  | 7,667 |  |  |  |  |
Derivative liabilities, current |  | 17,988 |  | 17,988 |  | 18,158 |  |  |  |  |
Derivative assets, noncurrent |  | 3,126 |  | 3,126 |  | 3,930 |  |  |  |  |
Derivative liabilities, noncurrent |  | 19,068 |  | 19,068 |  | 11,316 |  |  |  |  |
Energy Services | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 20,162 |  | 20,162 |  | 19,169 |  |  |  |  |
Derivative liabilities, current |  | 22,425 |  | 22,425 |  | 28,176 |  |  |  |  |
Derivative assets, noncurrent |  | 11,350 |  | 11,350 |  | 6,630 |  |  |  |  |
Derivative liabilities, noncurrent |  | 5,774 |  | 5,774 |  | 11,548 |  |  |  |  |
Energy Services | Not Designated as Hedging Instrument | Foreign currency contracts |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 10 |  | 10 |  | 0 |  |  |  |  |
Derivative liabilities, current |  | 183 |  | 183 |  | 126 |  |  |  |  |
Derivative assets, noncurrent |  | 0 |  | 0 |  | 0 |  |  |  |  |
Derivative liabilities, noncurrent |  | 81 |  | 81 |  | 118 |  |  |  |  |
First Mortgage | Natural Gas Distribution | Series VV |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 125,000 |  | $ 125,000 |  |
Term Loan | Credit Agreement Due August 16, 2019 | Interest rate swap |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | $ 100,000 |
Home Services and Other | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 20 |  | 20 |  | 381 |  |  |  |  |
Derivative liabilities, current |  | $ 0 |  | $ 0 |  | $ 0 |  |  |  |  |

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