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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, 2021 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | $ 62,844 | $ 48,153
Energy Services | Physical commodity contracts | Operating revenues |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 150 | 5,252
Energy Services | Physical commodity contracts | Natural gas purchases |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 1,505 | (5,054)
Energy Services | Financial commodity contracts | Natural gas purchases |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 61,189 | 47,755
Energy Services | Foreign currency contracts | Natural gas purchases |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 0 | 200
Natural Gas Distribution |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | (12,951) | (3,930)
Natural Gas Distribution | Physical commodity contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | 1,696 | 342
Natural Gas Distribution | Financial commodity contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (losses) gains recognized in income on derivatives | $ (14,647) | $ (4,272)

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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=125515794&loc=SL5618551-113959 + Details
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