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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, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net financial (loss) earnings | [1] | $ (17,506) |  |  |  | $ (8,003) |  |  |  | $ 149,004 |  | $ 269,392 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (gain) loss on derivative instruments and related transactions |  | (24,646) |  |  |  | 2,657 |  |  |  | (25,353) |  | 25,904 |
Tax effect |  | 5,885 |  |  |  | (577) |  |  |  | 6,034 |  | (3,920) |
Effects of economic hedging related to natural gas inventory |  | 11,317 |  |  |  | 4,474 |  |  |  | 12,073 |  | (14,788) |
Tax effect |  | (2,689) |  |  |  | (1,011) |  |  |  | (2,869) |  | 5,518 |
Net income to NFE tax adjustment |  | 1,029 |  |  |  | 728 |  |  |  | 7,700 |  | 6,987 |
NET (LOSS) INCOME |  | $ (8,402) | [1] | $ 73,573 | $ 86,248 | (14,274) | [1] | $ 140,266 | $ 123,699 | $ 151,419 | [1] | 249,691 | [1]
Tax Cuts And Jobs Act Of 2017, income tax benefit |  |  |  |  |  | $ 844 |  |  |  |  |  | $ (57,700) |
[1] | Includes income tax benefit related to the Tax Act of $844,000 and $57.7 million, for the three and nine months ended June 30, 2018, respectively.

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