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REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS (LOSS) RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting [Abstract] |  |  |  |  |  |  |  |
Net financial earnings (loss) | $ (3,551) |  |  | $ (14,148) |  |  | $ 192,425 | $ 201,113
Less: |  |  |  |  |  |  |  |
Unrealized (gain) loss on derivative instruments and related transactions | (17,891) |  |  | 21,862 |  |  | (58,060) | 13,627
Tax effect | 4,253 |  |  | (5,198) |  |  | 13,809 | (3,240)
Effects of economic hedging related to natural gas inventory | 428 |  |  | 2,486 |  |  | 25,160 | (12,255)
Tax effect | (102) |  |  | (591) |  |  | (5,979) | 2,912
(Gain on) impairment of equity method investment | (4,021) |  |  | 92,000 |  |  | (4,021) | 92,000
Tax effect | 1,003 |  |  | (11,934) |  |  | 1,003 | (11,934)
NFE tax adjustment | (274) |  |  | (942) |  |  | 113 | 980
NET INCOME (LOSS) | $ 13,053 | $ 96,035 | $ 111,312 | $ (111,831) | $ 149,809 | $ 81,045 | $ 220,400 | $ 119,023

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