Stockholders’ Equity - Schedule of Movement in Common Stock (Details) - USD ($) $ in Thousands			3 Months Ended
	Jul. 23, 2026	Jul. 07, 2026	Sep. 30, 2026
Tamboran common stock
Common stock, at the beginning of the period (in shares)			34,872,663
Issuance of common stock against vested equity awards (in shares)	9,964,200
Issuance of common stock for redemption of redeemable noncontrolling interests (in shares)			60,259
Common stock, at the end of the period (in shares)			34,960,006
Details
Total			$ 2,663
Issuance of common stock for redemption of redeemable noncontrolling interests			2,075
Less: Transaction costs			0
Cumulative net proceeds
Common stock, value, net proceeds at beginning of period			971,576
Less: Transaction costs			2,663
Common stock, value, net proceeds at end of period			$ 974,239
Share-based payment arrangement
Tamboran common stock
Issuance of common stock against vested equity awards (in shares)		27,084	27,084
Details
Issuance of common stock against vested equity awards			$ 589