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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, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting [Abstract] |  |  |  |  |  |  |  |
Net financial earnings (loss) | $ (5,817) |  |  | $ (17,506) |  |  | $ 141,524 | $ 149,004
Less: |  |  |  |  |  |  |  |
Unrealized loss (gain) on derivative instruments and related transactions | 23,712 |  |  | (24,646) |  |  | (21,827) | (25,353)
Tax effect | (5,639) |  |  | 5,885 |  |  | 5,189 | 6,034
Effects of economic hedging related to natural gas inventory | 4,739 |  |  | 11,317 |  |  | 10,474 | 12,073
Tax effect | (1,126) |  |  | (2,689) |  |  | (2,489) | (2,869)
NFE tax adjustment | (284) |  |  | 1,029 |  |  | (470) | 7,700
NET (LOSS) INCOME | $ (27,219) | $ 88,505 | $ 89,361 | $ (8,402) | $ 73,573 | $ 86,248 | $ 150,647 | $ 151,419

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