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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 13, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018 | May 30, 2018 | May 15, 2018 | May 11, 2018 | Jan. 31, 2018 | Jun. 30, 2015
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | $ 22,712 |  | $ 22,712 |  | $ 27,396 |  |  |  |  |
Derivative liabilities, current |  | 48,019 |  | 48,019 |  | 46,652 |  |  |  |  |
Derivative assets, noncurrent |  | 13,277 |  | 13,277 |  | 10,560 |  |  |  |  |
Derivative liabilities, noncurrent |  | 24,927 |  | 24,927 |  | 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 |  |  |  |  |  |  |  |  |  | 2.8375% |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 1,305 | $ (42,925) | (9,084) | $ (90,457) |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | 35,989 |  | 35,989 |  | 37,956 |  |  |  |  |
Derivative liabilities |  | 72,946 |  | 72,946 |  | 69,634 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 279 | 6,887 | 7,652 | (8,964) |  |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 1,436 | (12,879) | 4,413 | (15,855) |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 91 |  | 91 |  | 85 |  |  |  |  |
Derivative liabilities, current |  | 49 |  | 49 |  | 192 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | (1,157) | 7,232 | 3,239 | (1,576) |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 578 |  | 578 |  | 94 |  |  |  |  |
Derivative liabilities, current |  | 7 |  | 7 |  | 0 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 0 | $ 12,534 | 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 |  | 4,868 |  | 4,868 |  | 7,667 |  |  |  |  |
Derivative liabilities, current |  | 17,474 |  | 17,474 |  | 18,158 |  |  |  |  |
Derivative assets, noncurrent |  | 1,013 |  | 1,013 |  | 3,930 |  |  |  |  |
Derivative liabilities, noncurrent |  | 18,184 |  | 18,184 |  | 11,316 |  |  |  |  |
Energy Services | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 17,053 |  | 17,053 |  | 19,169 |  |  |  |  |
Derivative liabilities, current |  | 30,279 |  | 30,279 |  | 28,176 |  |  |  |  |
Derivative assets, noncurrent |  | 12,264 |  | 12,264 |  | 6,630 |  |  |  |  |
Derivative liabilities, noncurrent |  | 6,599 |  | 6,599 |  | 11,548 |  |  |  |  |
Energy Services | Not Designated as Hedging Instrument | Foreign currency contracts |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 2 |  | 2 |  | 0 |  |  |  |  |
Derivative liabilities, current |  | 210 |  | 210 |  | 126 |  |  |  |  |
Derivative assets, noncurrent |  | 0 |  | 0 |  | 0 |  |  |  |  |
Derivative liabilities, noncurrent |  | 144 |  | 144 |  | 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 |  | 120 |  | 120 |  | 381 |  |  |  |  |
Derivative liabilities, current |  | $ 0 |  | $ 0 |  | $ 0 |  |  |  |  |

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