REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS (LOSS) RECONCILIATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting [Abstract]
Net financial earnings (loss)	$ 65,770	$ 44,657
Less:
Unrealized (gain) on derivative instruments and related transactions	(82,191)	(37,491)
Tax effect	19,536	8,913
Effects of economic hedging related to natural gas inventory	23,577	(7,532)
Tax effect	(5,603)	1,790
NFE tax adjustment	(861)	(2,068)
NET INCOME	$ 111,312	$ 81,045