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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 13, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 31, 2020 | May 30, 2018 | May 15, 2018 | May 11, 2018 | Jan. 26, 2018 | Jun. 30, 2015
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) amortized in earning |  | $ 50 |  |  |  |  |  |  |  |
Asset Derivatives, current |  | 23,310 | $ 25,103 |  |  |  |  |  |  |
Asset Derivatives, noncurrent |  | 3,349 | 7,426 |  |  |  |  |  |  |
Liability Derivatives, current |  | 33,865 | 57,623 |  |  |  |  |  |  |
Liability Derivatives, noncurrent |  | 13,352 | 18,821 |  |  |  |  |  |  |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Loss recognized in income on derivatives |  | (56,705) | 7,412 | $ 34,175 |  |  |  |  |  |
Asset Derivatives |  | 26,659 | 32,529 |  |  |  |  |  |  |
Liability Derivatives |  | 47,217 | 76,444 |  |  |  |  |  |  |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 108 | 0 |  |  |  |  |  |  |
Treasury lock |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  |  |  |  |  | 3.26%
Interest rate, stated percentage |  |  |  |  |  |  |  | 4.01% |  |
Loss recognized in income on derivatives | $ 2,600 |  |  |  |  |  |  |  |  |
Unsecured senior notes | Credit Agreement Due August 16, 2019 | Interest rate swap |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  |  |  |  | 2.84% |
Debt issued |  |  |  |  |  |  |  |  | $ 100,000 |
Home Services and Other | Treasury lock |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Loss recognized in income on derivatives |  | 13,700 |  |  |  |  |  |  |  |
Home Services and Other | Debt Issued In September 2020 |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  | 200,000 |  |  |  |  |  |  |  |
Home Services and Other | Debt Issued In July 2020 |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 260,000 |  |  |  |  |
Natural Gas Distribution | Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Loss recognized in income on derivatives |  | 1,826 | 1,774 | (11,543) |  |  |  |  |  |
Natural Gas Distribution | Treasury lock |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Loss recognized in income on derivatives |  | 6,600 |  |  |  |  |  |  |  |
Natural Gas Distribution | Physical commodity contracts | Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Loss recognized in income on derivatives |  | (2,077) | (5,926) | (1,232) |  |  |  |  |  |
Asset Derivatives, current |  | 78 | 67 |  |  |  |  |  |  |
Liability Derivatives, current |  | 76 | 245 |  |  |  |  |  |  |
Natural Gas Distribution | Financial commodity contracts | Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Loss recognized in income on derivatives |  | 3,903 | 7,700 | $ (1,844) |  |  |  |  |  |
Asset Derivatives, current |  | 71 | 382 |  |  |  |  |  |  |
Liability Derivatives, current |  | 282 | 570 |  |  |  |  |  |  |
Natural Gas Distribution | Series LL |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 125,000 |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 5.60% |  |  |
Natural Gas Distribution | Debt Issued In September 2020 |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  | 75,000 |  |  |  |  |  |  |  |
Natural Gas Distribution | First Mortgage | Series VV |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 125,000 |  | $ 125,000 |  |
Energy Services | Physical commodity contracts | Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Derivatives, current |  | 6,454 | 6,847 |  |  |  |  |  |  |
Asset Derivatives, noncurrent |  | 1,264 | 1,710 |  |  |  |  |  |  |
Liability Derivatives, current |  | 20,438 | 27,540 |  |  |  |  |  |  |
Liability Derivatives, noncurrent |  | 12,003 | 12,641 |  |  |  |  |  |  |
Energy Services | Financial commodity contracts | Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Derivatives, current |  | 16,671 | 17,806 |  |  |  |  |  |  |
Asset Derivatives, noncurrent |  | 2,037 | 5,716 |  |  |  |  |  |  |
Liability Derivatives, current |  | 12,965 | 29,057 |  |  |  |  |  |  |
Liability Derivatives, noncurrent |  | 1,346 | 6,105 |  |  |  |  |  |  |
Energy Services | Foreign currency contracts | Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Derivatives, current |  | 36 | 1 |  |  |  |  |  |  |
Asset Derivatives, noncurrent |  | 48 | 0 |  |  |  |  |  |  |
Liability Derivatives, current |  | 104 | 211 |  |  |  |  |  |  |
Liability Derivatives, noncurrent |  | $ 3 | $ 75 |  |  |  |  |  |  |

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- Definition The amount of expense charged against earnings by an Entity to record deferred gains and losses on hedge instruments. Examples include gain on economic hedges, amortization of gain on designated fair value hedge and so forth. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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