Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Numerator:
Net loss after income tax attributable to Tamboran Resources Corporation stockholders	$ (12,116)	$ (8,182)
Denominator:
Weighted average number of common stock outstanding, basic (in shares)	34,943,175	17,525,363
Weighted average number of common stock outstanding, diluted (in shares)	34,943,175	17,525,363
Net loss per share, basic (in USD per share)	$ (0.347)	$ (0.467)
Net loss per share, diluted (in USD per share)	$ (0.347)	$ (0.467)