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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, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting [Abstract] |  |  |  |  |  |  |  |
Net financial earnings (loss) | $ (14,148) |  |  | $ 2,682 |  |  | $ 201,113 | $ 121,904
Less: |  |  |  |  |  |  |  |
Unrealized loss (gain) on derivative instruments and related transactions | 21,862 |  |  | 23,712 |  |  | 13,627 | (21,827)
Tax effect | (5,198) |  |  | (5,639) |  |  | (3,240) | 5,189
Effects of economic hedging related to natural gas inventory | 2,486 |  |  | 4,739 |  |  | (12,255) | 10,474
Tax effect | (591) |  |  | (1,126) |  |  | 2,912 | (2,489)
Other than temporary impairment | 92,000 |  |  | 0 |  |  | 92,000 | 0
Tax effect | (11,934) |  |  | 0 |  |  | (11,934) | 0
NFE tax adjustment | (942) |  |  | 294 |  |  | 980 | 257
NET (LOSS) INCOME | $ (111,831) | $ 149,809 | $ 81,045 | $ (19,298) | $ 73,846 | $ 75,752 | $ 119,023 | $ 130,300

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