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REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting [Abstract] |  |  |
Net financial earnings | $ 240,321 | $ 207,712 | $ 165,333
Less: |  |  |
Unrealized (gain) loss on derivative instruments and related transactions | (59,906) | 54,203 | (9,644)
Tax effect | 14,248 | (12,887) | 2,296
Effects of economic hedging related to natural gas inventory | 19,939 | (42,405) | 12,690
Tax effect | (4,738) | 10,078 | (3,016)
(Gain on) impairment of equity method investment | (5,521) | 92,000 | 0
Tax effect | 1,377 | (11,167) | 0
NET INCOME | $ 274,922 | $ 117,890 | $ 163,007

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