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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
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | $ 2,564 | $ (21,318) | $ 21,714 | $ 38,616
Energy Services | Physical commodity contracts | Operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 608 | 997 | (10,824) | 42,668
Energy Services | Physical commodity contracts | Natural gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 1,975 | 1,100 | 2,605 | (1,304)
Energy Services | Financial commodity contracts | Natural gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | (19) | (23,426) | 29,947 | (2,986)
Energy Services | Foreign currency contracts | Natural gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 0 | 11 | (14) | 238
Natural Gas Distribution |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 3,128 | 15,882 | 56,200 | 13,688
Natural Gas Distribution | Physical commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 646 | 399 | 6,880 | 1,832
Natural Gas Distribution | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | $ 2,482 | $ 15,483 | $ 49,320 | $ 11,856

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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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