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REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS (LOSS) RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net financial earnings | [1] | $ 112,417 |  |  | $ 142,062 |  |  | $ 166,510 |  | $ 277,395 |
Less: |  |  |  |  |  |  |  |  |  |  |
Unrealized (gain) loss on derivative instruments and related transactions |  | 10,226 |  |  | (11,608) |  |  | (707) |  | 23,246 |
Tax effect |  | (2,435) |  |  | 4,716 |  |  | 149 |  | (3,343) |
Effects of economic hedging related to natural gas inventory |  | 22,367 |  |  | 6,125 |  |  | 756 |  | (19,262) |
Tax effect |  | (5,316) |  |  | (1,715) |  |  | (180) |  | 6,529 |
Net income to NFE tax adjustment |  | 14,002 |  |  | 4,278 |  |  | 6,671 |  | 6,260 |
NET INCOME |  | $ 73,573 | [1] | $ 86,248 | 140,266 | [1] | $ 123,699 | $ 159,821 | [1] | 263,965 | [1]
Tax Cuts And Jobs Act Of 2017, income tax benefit |  |  |  |  | $ (967) |  |  |  |  | $ (58,500) |
[1] | Includes income tax benefit related to the Tax Act of $967,000 and $58.5 million, for the three and six months ended March 31, 2018, respectively.

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