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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS (LOSS) RECONCILIATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting [Abstract]
Net financial earnings	$ 17,395	$ 10,972	$ 161,884	$ 140,144
Less:
Unrealized (gain) loss on derivative instruments and related transactions	(15,981)	55,875	(42,534)	57,910
Tax effect	5,985	(20,282)	15,907	(21,021)
Effects of economic hedging related to natural gas inventory	13,203	(11,380)	29,592	(8,621)
Tax effect	(4,947)	4,130	(11,077)	3,129
Net income to NFE tax adjustment	178	(8)	1,408	2,475
NET INCOME (LOSS)	$ 18,957	$ (17,363)	$ 168,588	$ 106,272

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Effects of Economic Hedging Related to Natural Gas Inventory, Tax

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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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Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Tax

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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
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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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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