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TRANSACTIONS - Joint Venture with Astron on the Donald Project (Details) $ in Thousands, $ in Millions			3 Months Ended	9 Months Ended		12 Months Ended	16 Months Ended
	Jun. 30, 2025 USD ($)	Sep. 24, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 03, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 25, 2024	Jun. 03, 2024 USD ($)	Jun. 03, 2024 AUD ($)
Variable Interest Entity [Line Items]
Amount expected to be invested within the next year				$ 9,343	$ 7,306
Variable interest entity, maximum loss exposure				$ 21,130			$ 21,130
Shares issued for joint venture interests			$ 3,500
Donald Project Joint Venture
Variable Interest Entity [Line Items]
Equity method, ownership percentage				7.49%			7.49%	3.21%
Astron Corporation Limited | Donald Project Joint Venture
Variable Interest Entity [Line Items]
Equity method, ownership percentage				92.51%			92.51%
Private Placement
Variable Interest Entity [Line Items]
Shares issued for joint venture interests		$ 3,500
Private Placement | Maximum
Variable Interest Entity [Line Items]
Value of common shares issued in transaction						$ 17,500
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum right to invest									$ 120,900	$ 183
Maximum possible ownership percentage						49.00%
Amount expected to be invested within the next year	$ 13,000						$ 17,630

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