Variable Interest Entities - Narrative (Details) $ in Millions		1 Months Ended	12 Months Ended
	Jun. 03, 2024	Oct. 31, 2024	Jun. 30, 2026	Mar. 30, 2026 USD ($) a	Mar. 20, 2026 a $ / a
Phase 2 Development Area ("P2DA"), Previously "Dev A++"
Variable Interest Entity [Line Items]
Area of land					100,000
Daly Waters Energy, LP (“DWE”) \| Tamboran (Beetaloo) Pty
Variable Interest Entity [Line Items]
Area of land				10,000
Asset sale agreement, consideration transferred \| $				$ 28.5
Tamboran (West) Pty Ltd (“TR West”), Daly Waters Energy, LP (“DWE”), Elliot Energy I Pty Ltd
Variable Interest Entity [Line Items]
Asset sale agreement, consideration transferred per acre (in USD per acre) \| $ / a					150
Variable interest entity, primary beneficiary \| Daly Waters Infrastructure, LP (“DWI”) \| Tamboran SPCF Pty Ltd (“TR SPCF")
Variable Interest Entity [Line Items]
Joint venture, ownership percentage		50.00%
Variable interest entity, primary beneficiary \| Daly Waters Energy, LP (“DWE”) \| Tamboran (B1) Pty Ltd ("TB1")
Variable Interest Entity [Line Items]
Joint venture, ownership percentage	50.00%		50.00%