Property, Plant and Equipment & Natural Gas Properties - Schedule of Natural Gas Properties (Details) - Unproved properties $ in Thousands	9 Months Ended
Mar. 31, 2026 USD ($)
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2025	$ 342,314
Capital expenditure	96,989
Restoration assets	60
Interest on finance lease liability and related depreciation of ROU assets capitalized	8,990
Disposal	(444)
Government grants	(120)
Effect of changes in foreign exchange rates	17,231
Balance at March 31, 2026	465,020
EP 161
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2025	25,091
Capital expenditure	941
Restoration assets	0
Interest on finance lease liability and related depreciation of ROU assets capitalized	0
Disposal	0
Government grants	(66)
Effect of changes in foreign exchange rates	1,083
Balance at March 31, 2026	27,049
EP 136
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2025	45,483
Capital expenditure	151
Restoration assets	0
Interest on finance lease liability and related depreciation of ROU assets capitalized	0
Disposal	(444)
Government grants	(54)
Effect of changes in foreign exchange rates	2,058
Balance at March 31, 2026	47,194
EP 76, 98 and 117
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2025	271,740
Capital expenditure	95,897
Restoration assets	60
Interest on finance lease liability and related depreciation of ROU assets capitalized	8,990
Disposal	0
Government grants	0
Effect of changes in foreign exchange rates	14,090
Balance at March 31, 2026	$ 390,777

Oil And Gas, Successful Efforts Method, Property And Equipment, Decrease Through Disposals

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- Definition

Oil And Gas, Successful Efforts Method, Property And Equipment, Increase (Decrease) In Foreign Exchange Rates

+ References

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- Definition

Oil And Gas, Successful Efforts Method, Property And Equipment, Increase (Decrease) Through Government Grants

+ References

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- Definition

Oil And Gas, Successful Efforts Method, Property And Equipment, Interest On Finance Lease Liability And Related Depreciation Of ROU Assets Capitalized

+ References

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- Definition

Oil And Gas, Successful Efforts Method, Property And Equipment, Restoration Assets

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- Definition

Amount of expense for capitalized exploratory well costs for which proved reserves were not found at the exploratory well.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 932
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount, after accumulated depreciation, depletion, amortization, and impairment, of oil and gas properties accounted for under successful efforts method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 932
-SubTopic 360
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478810/932-360-50-1

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