Commitments and Contingencies - Narrative (Details) $ in Thousands, $ in Millions	3 Months Ended
	Sep. 30, 2025 AUD ($) well license	Sep. 30, 2025 USD ($) well license	Jun. 30, 2025 USD ($)	Dec. 19, 2024 AUD ($) bondFacility
Other Commitments [Line Items]
Number of potential additional performance bond facilities | bondFacility				2
Unamortized debt issuance expense	$ 0.6
Amortization of debt issuance costs	$ 0.1
APA Group (APA) | Development Agreement ("DA")
Other Commitments [Line Items]
Guarantor obligation, construction costs covered by bank guarantees, percentage	67.00%	67.00%
APA Group (APA) | Development Agreement ("DA") | Financial Guarantee
Other Commitments [Line Items]
Guarantor obligations, current carrying value	$ 18.6
Letter of credit, facility A | Macquarie Bank Limited (“Macquarie”)
Other Commitments [Line Items]
Line of credit facility, maximum borrowing capacity				$ 25.0
Letters of credit outstanding, amount	23.3
Line of credit facility, remaining borrowing capacity	$ 1.7
Letter of credit, facility B | Macquarie Bank Limited (“Macquarie”)
Other Commitments [Line Items]
Line of credit facility, maximum borrowing capacity				5.0
Line of credit facility, conditions to issue stock, value, new issues				62.5
Letter of credit, facility C | Macquarie Bank Limited (“Macquarie”)
Other Commitments [Line Items]
Line of credit facility, maximum borrowing capacity				5.0
Line of credit facility, conditions to issue stock, value, new issues				75.0
Letter of credit facility A, B and C | Macquarie Bank Limited (“Macquarie”)
Other Commitments [Line Items]
Line of credit facility, current borrowing capacity				$ 35.0
Letter of credit | Line of credit
Other Commitments [Line Items]
Interest rate, stated percentage	12.00%	12.00%
Letter of credit | Macquarie Bank Limited (“Macquarie”)
Other Commitments [Line Items]
Line of credit facility, covenants, minimum liquidity	$ 20.0
Line of credit facility, covenants, minimum current ratio	100.00%	100.00%
Line of credit facility, establishment fee	$ 0.5
Line of credit, drawdown fee percentage	10.00%
Line of credit facility, commitment fee percentage	4.00%
Letter of credit, facility B and C | Macquarie Bank Limited (“Macquarie”)
Other Commitments [Line Items]
Line of credit facility, remaining borrowing capacity	$ 10.0
Sweetpea
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		$ 23,074	$ 23,115
Number of licenses | license	2	2
Sweetpea | EP 136
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		$ 13,900
Unrecorded unconditional purchase obligation, term	5 years
Sweetpea | EP 143
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		9,200
EP 161
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		2,314	2,302
Beetaloo Joint Venture
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		$ 75,779	75,630
Number of wells | well	4	4
Beetaloo Joint Venture | EP 76
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		$ 10,600
Beetaloo Joint Venture | EP 98
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		53,600
Beetaloo Joint Venture | EP 117
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		11,500
Midstream
Other Commitments [Line Items]
Committed at the reporting date but not recognized as liabilities, payable:		$ 11,960	$ 9,056