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REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS (LOSS) RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting [Abstract] |  |  |  |  |  |
Net financial earnings | $ 138,576 |  | $ 112,310 |  | $ 211,020 | $ 222,594
Less: |  |  |  |  |  |
Unrealized loss (gain) on derivative instruments and related transactions | 25,457 |  | 13,971 |  | 20,057 | (17,532)
Tax effect | (6,049) |  | (3,320) |  | (4,767) | 4,167
Effects of economic hedging related to natural gas inventory | (2,845) |  | (11,203) |  | (19,073) | 12,769
Tax effect | 676 |  | 2,662 |  | 4,533 | (3,035)
Gain on equity method investment | 0 |  | (200) |  | 0 | (200)
Tax effect | 0 |  | 50 |  | 0 | 50
NFE tax adjustment | 525 |  | 103 |  | 47 | 207
NET INCOME | $ 120,812 | $ 89,411 | $ 110,247 | $ 115,921 | $ 210,223 | $ 226,168

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