Property, Plant and Equipment & Natural Gas Properties - Schedule of Natural Gas Properties (Details) - Unproved properties $ in Thousands	3 Months Ended
Sep. 30, 2026 USD ($)
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2026	$ 807,036
Capital expenditure	73,278
Transfer of equipment	0
Restoration assets	54
Interest on finance lease liability and related depreciation of ROU assets capitalized	2,876
Government grants	(2,105)
Effect of changes in foreign exchange rates	9,032
Balance at September 30, 2026	890,171
EP 161
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2026	29,702
Capital expenditure	6,060
Transfer of equipment	0
Restoration assets	4
Interest on finance lease liability and related depreciation of ROU assets capitalized	0
Government grants	0
Effect of changes in foreign exchange rates	291
Balance at September 30, 2026	36,057
EP 136
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2026	47,424
Capital expenditure	170
Transfer of equipment	(2,540)
Restoration assets	0
Interest on finance lease liability and related depreciation of ROU assets capitalized	0
Government grants	0
Effect of changes in foreign exchange rates	620
Balance at September 30, 2026	45,674
EP 76, 98 and 117
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2026	728,296
Capital expenditure	67,048
Transfer of equipment	2,540
Restoration assets	50
Interest on finance lease liability and related depreciation of ROU assets capitalized	2,876
Government grants	(2,105)
Effect of changes in foreign exchange rates	8,121
Balance at September 30, 2026	806,826
Mako Trough
Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward]
Balance at July 1, 2026	1,614
Capital expenditure	0
Transfer of equipment	0
Restoration assets	0
Interest on finance lease liability and related depreciation of ROU assets capitalized	0
Government grants	0
Effect of changes in foreign exchange rates	0
Balance at September 30, 2026	$ 1,614

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

No definition available.

Name:	trc_OilAndGasSuccessfulEffortsMethodPropertyAndEquipmentIncreaseDecreaseInForeignExchangeRates
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Oil and Gas, Successful Efforts Method, Property and Equipment, Increase (Decrease) Through Government Grant

+ References

No definition available.

+ Details

Name:	trc_OilAndGasSuccessfulEffortsMethodPropertyAndEquipmentIncreaseDecreaseThroughGovernmentGrant
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	trc_OilAndGasSuccessfulEffortsMethodPropertyAndEquipmentInterestOnFinanceLeaseLiabilityAndRelatedDepreciationOfROUAssetsCapitalized
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	trc_OilAndGasSuccessfulEffortsMethodPropertyAndEquipmentRestorationAssets
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Oil And Gas, Successful Efforts Method, Property And Equipment, Transfer Of Equipment

+ References

No definition available.

+ Details

Name:	trc_OilAndGasSuccessfulEffortsMethodPropertyAndEquipmentTransferOfEquipment
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_CapitalizedExploratoryWellCostChargedToExpense1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_IncreaseDecreaseInCapitalizedExploratoryWellCostsThatArePendingDeterminationOfProvedReservesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

Name:	us-gaap_OilAndGasPropertySuccessfulEffortMethodNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=trc_UnprovedPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=trc_EP161Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=trc_EP136Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=trc_EP7698And117Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=trc_MakoTroughMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: