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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, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting [Abstract]
Net financial earnings (loss)	$ 6,198			$ (8,899)			$ 313,388	$ 202,121
Less:
Unrealized loss (gain) on derivative instruments and related transactions	10,766			3,803			(10,072)	23,860
Tax effect	(2,559)			(903)			2,394	(5,670)
Effects of economic hedging related to natural gas inventory	16,924			(385)			747	(19,458)
Tax effect	(4,022)			91			(178)	4,624
NFE tax adjustment	140			69			(58)	116
NET (LOSS) INCOME	$ (15,051)	$ 204,287	$ 131,319	$ (11,574)	$ 120,812	$ 89,411	$ 320,555	$ 198,649

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