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.