Variable Interest Entities - Narrative (Details) $ / shares in Units, $ in Millions					1 Months Ended			3 Months Ended
	Jul. 28, 2025 $ / shares shares	May 12, 2025 USD ($) area $ / a acre ft	Jun. 03, 2024	Sep. 18, 2022	Sep. 30, 2025 USD ($) $ / shares shares	Nov. 30, 2024 shares	Oct. 31, 2024	Sep. 30, 2025 USD ($) $ / shares	Jun. 30, 2025 USD ($)	May 12, 2025 AUD ($) area $ / a acre ft	Dec. 31, 2024 USD ($)	Jun. 30, 2024 $ / shares	Mar. 21, 2024	Mar. 04, 2024	Nov. 09, 2022
Variable Interest Entity [Line Items]
Commitments and contingencies (Note 12)
Capital raise (in shares) | shares	50,000				50,000	312,500
Issue price (in USD per share) | $ / shares	$ 19.75				$ 19.75			$ 19.75				$ 24.00
Asset sale agreement, number of areas sold | area		2								2
Daly Waters Energy, LP (“DWE”) | Beetaloo Basin
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage															38.75%
Daly Waters Energy, LP (“DWE”) | Beetaloo Basin, Phase 2 Development Area
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage		19.38%								19.38%
Daly Waters Energy, LP (“DWE”) | Beetaloo Basin, Pilot Area
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage		47.50%								47.50%
Falcon | Beetaloo Basin
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage		22.50%								22.50%					22.50%
Falcon | Beetaloo Basin, SS2 Well Pad | Maximum
Variable Interest Entity [Line Items]
Equity, ownership percentage														5.00%
Falcon | Beetaloo Basin, Phase 2 Development Area
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage		22.50%								22.50%
Falcon | Beetaloo Basin, Pilot Area
Variable Interest Entity [Line Items]
Equity, ownership percentage		5.00%								5.00%
Beetaloo Basin
Variable Interest Entity [Line Items]
Net prospective, development-ready acres retained (in acres) | acre ft		1,900,000								1,900,000
Beetaloo Basin | Tamboran (B1) Pty Ltd ("TB1")
Variable Interest Entity [Line Items]
Subsidiary, ownership percentage															77.50%
Beetaloo Basin, SS2 Well Pad | Tamboran B2 Pty Ltd | Minimum
Variable Interest Entity [Line Items]
Subsidiary, ownership percentage													95.00%
Beetaloo Basin, Phase 2 Development Area
Variable Interest Entity [Line Items]
Subsidiary, ownership percentage		58.12%								58.12%
Phase two development area, gross acres reserved (in acres) | acre ft		406,693								406,693
Beetaloo Basin, Phase 2 Development Area | Tamboran Resources Corporation
Variable Interest Entity [Line Items]
Phase two development area, gross acres reserved (in acres) | acre ft		236,370								236,370
Beetaloo Basin, Ex-EP 76, 98 and 117
Variable Interest Entity [Line Items]
Subsidiary, ownership percentage		77.50%								77.50%
Daly Waters Energy, LP (“DWE”)
Variable Interest Entity [Line Items]
Asset sale agreement, acres of non-operating and non-controlling interest | acre ft		100,000								100,000
Asset sale agreement, consideration transferred		$ 15.0
Asset sale agreement, consideration transferred per acre (in USD per acre) | $ / a		150								150
Tamboran (West) Pty Ltd (“TR West”) | Daly Waters Energy, LP (“DWE”)
Variable Interest Entity [Line Items]
Non-operating and non-controlling interest in post-checkerboard acreage position, number of areas | area		2								2
Asset acquisition, consideration transferred		$ 15.0
Daly Water Energy LP | Tamboran (B1) Pty Ltd | Checkerboarding Strategy, Tranche 1
Variable Interest Entity [Line Items]
Variable interest entity, retention licenses, percentage split		38.75%
Asset sale agreement, deadline covenant, sales price for entire interest										$ 1.00
Variable interest entity, primary beneficiary | Tamboran (B1) Pty Ltd ("TB1")
Variable Interest Entity [Line Items]
Joint venture, ownership percentage				50.00%
Variable interest entity, primary beneficiary | Beetaloo Basin
Variable Interest Entity [Line Items]
Subsidiary, ownership percentage															38.75%
Variable interest entity, primary beneficiary | Beetaloo Basin, Pilot Area
Variable Interest Entity [Line Items]
Subsidiary, ownership percentage		47.50%								47.50%
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%
Commitments and contingencies (Note 12)											$ 7.5
Issuance of stock and warrants for services or claims								$ 15.0
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%