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REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting [Abstract] |  |  |
Net financial earnings | $ 290,828 | $ 261,827 | $ 240,321
Less: |  |  |
Unrealized loss (gain) on derivative instruments and related transactions | 19,574 | (38,081) | (59,906)
Tax effect | (4,652) | 9,050 | 14,248
Effects of economic hedging related to natural gas inventory | (18,192) | 34,699 | 19,939
Tax effect | 4,323 | (8,246) | (4,738)
Gain on equity method investment | 0 | (300) | (5,521)
Tax effect | 0 | (19) | 1,377
NET INCOME | $ 289,775 | $ 264,724 | $ 274,922

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