REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS (LOSS) RECONCILIATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting [Abstract]
Net financial earnings	$ 128,894	$ 72,444
Less:
Unrealized loss (gain) on derivative instruments and related transactions	6,368	(5,400)
Tax effect	(1,513)	1,282
Effects of economic hedging related to natural gas inventory	(9,527)	(16,228)
Tax effect	2,264	3,857
NFE tax adjustment	(17)	(478)
NET INCOME	$ 131,319	$ 89,411