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REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS (LOSS) RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting [Abstract] |  |  |
Net financial earnings | [1] | $ 54,093 | $ 135,333
Less: |  |  |
Unrealized (gain) loss on derivative instruments and related transactions |  | (10,932) | 34,855
Tax effect |  | 2,583 | (8,059)
Effects of economic hedging related to natural gas inventory |  | (21,611) | (25,387)
Tax effect |  | 5,136 | 8,244
Net income to NFE tax adjustment |  | (7,331) | 1,981
NET INCOME |  | $ 86,248 | 123,699
Tax Cuts And Jobs Act Of 2017, income tax benefit |  |  | $ 57,600
[1] | Includes income tax benefit related to the Tax Act of $57.6 million, for the three months ended December 31, 2017.

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