Related Party Transactions (Details) - Variable interest entity, primary beneficiary - USD ($) $ in Millions		1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 03, 2024	Oct. 31, 2024	Sep. 30, 2026	Sep. 30, 2025	Jun. 30, 2026
Daly Waters Energy, LP (“DWE”) | Tamboran (B1) Pty Ltd ("TB1")
Related Party Transaction [Line Items]
Joint venture, ownership percentage	50.00%	50.00%			50.00%
Daly Waters Energy, LP (“DWE”) | Beetaloo Basin | Co-venturer
Related Party Transaction [Line Items]
Expenditures for which contributions are due			$ 34.0	$ 14.8
Unpaid cash calls receivable			7.8
Tamboran Resources Corporation | SPCF Sub Trust
Related Party Transaction [Line Items]
Joint venture, ownership percentage	50.00%
Daly Waters Infrastructure, LP (“DWI”) | Tamboran SPCF Pty Ltd (“TR SPCF")
Related Party Transaction [Line Items]
Joint venture, ownership percentage		50.00%
Daly Waters Infrastructure, LP (“DWI”) | Tamboran SPCF Pty Ltd (“TR SPCF") | Co-venturer
Related Party Transaction [Line Items]
Expenditures for which contributions are due			$ 0.8