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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting [Abstract] |  |  |  |
Net financial earnings | $ (8,003) | $ 17,395 | $ 269,392 | $ 161,884
Less: |  |  |  |
Unrealized (gain) loss on derivative instruments and related transactions | 2,657 | (15,981) | 25,904 | (42,534)
Tax effect | (577) | 5,985 | (3,920) | 15,907
Effects of economic hedging related to natural gas inventory | 4,474 | 13,203 | (14,788) | 29,592
Tax effect | (1,011) | (4,947) | 5,518 | (11,077)
Net income to NFE tax adjustment | 728 | 178 | 6,987 | 1,408
NET (LOSS) INCOME | (14,274) | $ 18,957 | 249,691 | $ 168,588
Tax Cuts And Jobs Act Of 2017, income tax benefit | $ 844 |  | $ (57,688) |

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