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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 11,592 | $ 2,564 | $ 99,518 | $ 21,714
Energy Services | Physical commodity contracts | Operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 12,648 | $ 608 | $ 29,894 | $ (10,824)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Nonutility | Nonutility | Nonutility | Nonutility
Energy Services | Physical commodity contracts | Natural gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (5,914) | $ 1,975 | $ (6,708) | $ 2,605
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gas purchases - Utility and Nonutility | Gas purchases - Utility and Nonutility | Gas purchases - Utility and Nonutility | Gas purchases - Utility and Nonutility
Energy Services | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 4,858 | $ (19) | $ 76,332 | $ 29,947
Energy Services | Foreign currency contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 0 | 0 | 0 | (14)
Natural Gas Distribution |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 18,315 | 3,128 | (79,876) | 56,200
Natural Gas Distribution | Physical commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 315 | 646 | (27,919) | 6,880
Natural Gas Distribution | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 18,000 | $ 2,482 | $ (51,957) | $ 49,320

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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 -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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