Related Party Transactions (Details) $ in Thousands				1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 23, 2025 USD ($)	Jun. 03, 2024	Sep. 18, 2022	Oct. 31, 2024	Sep. 30, 2025 USD ($) shareholder	Sep. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jul. 01, 2023
Related Party Transaction [Line Items]
Number of shareholders | shareholder					2
Proceeds from issue of common stock	$ 16,700				$ 10,966	$ 0
Finance lease payable					23,251
Variable interest entity, primary beneficiary | Tamboran (B1) Pty Ltd ("TB1")
Related Party Transaction [Line Items]
Joint venture, ownership percentage			50.00%
Variable interest entity, primary beneficiary | Daly Waters Energy, LP (“DWE”) | Tamboran (B1) Pty Ltd ("TB1")
Related Party Transaction [Line Items]
Joint venture, ownership percentage		50.00%
Variable interest entity, primary beneficiary | Tamboran Resources Corporation | SPCF Sub Trust
Related Party Transaction [Line Items]
Joint venture, ownership percentage		50.00%
Variable interest entity, primary beneficiary | Daly Waters Infrastructure, LP (“DWI”) | Tamboran SPCF Pty Ltd (“TR SPCF")
Related Party Transaction [Line Items]
Joint venture, ownership percentage				50.00%
Equipment
Related Party Transaction [Line Items]
Term of contract, rig								25 months
Finance lease, initial direct cost					3,000
Finance lease payable					1,200
Co-venturer | Variable interest entity, primary beneficiary | Daly Waters Energy, LP (“DWE”) | Beetaloo Basin
Related Party Transaction [Line Items]
Expenditures for which contributions are due					14,800
Unpaid cash calls receivable					1,400
Co-venturer | Variable interest entity, primary beneficiary | Daly Waters Infrastructure, LP (“DWI”) | Tamboran SPCF Pty Ltd (“TR SPCF")
Related Party Transaction [Line Items]
Expenditures for which contributions are due					8,500
Unpaid cash calls receivable					$ 1,900
Equity investment | Majority shareholder
Related Party Transaction [Line Items]
Proceeds from issue of common stock							$ 15,000