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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | $ 54,634 | $ (10,389)
Interest rate contracts | Interest Expense | Home Services and Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 0 | (123)
Energy Services | Physical commodity contracts | Operating revenues |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 9,836 | (1,532)
Energy Services | Physical commodity contracts | Gas purchases |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | (1,410) | (5,432)
Energy Services | Financial commodity contracts | Gas purchases |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 46,093 | (2,956)
Energy Services | Foreign currency contracts | Gas purchases |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 115 | (346)
Natural Gas Distribution |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | (248) | 7,373
Natural Gas Distribution | Physical commodity contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 840 | 2,977
Natural Gas Distribution | Financial commodity contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | $ (1,088) | $ 4,396

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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=109980867&loc=SL5618551-113959 + Details
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