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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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Income Tax Expense (Benefit) on Financial Earnings (Loss)

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Increase (Decrease) in Economic Hedging Related to Natural Gas Inventory, Before Taxes

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Net Financial Earnings (Loss) is a non-GAAP measure of earnings that eliminates certain timing differences surrounding the recognition of certain gains or losses associated with derivative activity

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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