Additional draw down.

No definition available.

Name:	groy_AdditionalDrawDown
Namespace Prefix:	groy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Additional secured bank loans to be available.

+ References

No definition available.

+ Details

Name:	groy_AdditionalSecuredBankLoansToBeAvailable
Namespace Prefix:	groy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Borrowings maturity date.

+ References

No definition available.

+ Details

Name:	groy_BorrowingsMaturityDate
Namespace Prefix:	groy_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Standby fee on undrawn portion of bank loan.

+ References

No definition available.

+ Details

Name:	groy_StandbyFeeOnUndrawnPortionOfBankLoan
Namespace Prefix:	groy_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_BorrowingsAdjustmentToInterestRateBasis
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of loans received from banks that have been secured by collateral. [Refer: Loans received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_SecuredBankLoansReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_BorrowingsByNameAxis=groy_SecuredRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=groy_BaseRatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=groy_SecuredOvernightFinancingRatesSofrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=groy_AdditionalDrawdownMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=groy_CozaminMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=groy_VaresCopperStreamMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Bank loan (Details Narrative) - USD ($) $ in Thousands								12 Months Ended
Bank loan (Details Narrative) - USD ($) $ in Thousands	Feb. 24, 2025	Mar. 01, 2024	Feb. 17, 2023	Sep. 14, 2022	Feb. 24, 2022	Feb. 08, 2022	Jan. 24, 2022	Dec. 31, 2024	Jun. 04, 2024	Aug. 30, 2023	Feb. 10, 2023
Disclosure of detailed information about borrowings [line items]
Additional Draw Down								$ 25,287
Secured Revolving Credit Facility [Member]
Disclosure of detailed information about borrowings [line items]
Bank loan availed							$ 10,000		$ 30,000	$ 25,000	$ 20,000
Additional bank loan available							$ 15,000		5,000	10,000	$ 15,000
Standby fee on undrawn portion of bank loan							0.90%
Bank loan maturity date	Mar. 31, 2027	Mar. 31, 2027		Mar. 31, 2025			Mar. 31, 2023
Additional Draw Down			$ 10,287		$ 7,000	$ 3,000
Secured Revolving Credit Facility [Member] \| Base Rate [Member]
Disclosure of detailed information about borrowings [line items]
Bank loan interest rate margin							3.00%
Secured Revolving Credit Facility [Member] \| SOFR Rate [Member]
Disclosure of detailed information about borrowings [line items]
Bank loan interest rate margin							4.00%
Additional Drawdown \| Cozamin [member]
Disclosure of detailed information about borrowings [line items]
Additional bank loan available										$ 7,500
Additional Drawdown \| Vares Copper Stream [Member]
Disclosure of detailed information about borrowings [line items]
Additional bank loan available									$ 15,000