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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | $ (43,694) | $ 11,781 | $ 19,150 | $ 59,934
Energy Services | Physical commodity contracts | Operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | (11,582) | 36,419 | (11,432) | 41,671
Energy Services | Physical commodity contracts | Natural gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | (875) | 2,650 | 630 | (2,404)
Energy Services | Financial commodity contracts | Natural gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | (31,223) | (27,315) | 29,966 | 20,440
Energy Services | Foreign currency contracts | Natural gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | (14) | 27 | (14) | 227
Natural Gas Distribution |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 66,023 | 1,736 | 53,072 | (2,194)
Natural Gas Distribution | Physical commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 4,538 | 1,091 | 6,234 | 1,433
Natural Gas Distribution | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | $ 61,485 | $ 645 | $ 46,838 | $ (3,627)

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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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