LEASES - Operating Subleases (Details) $ in Thousands	Dec. 31, 2025 USD ($)
Leases [Abstract]
2026	$ 2,224
2027	2,228
2028	2,247
2029	2,254
2030	2,376
Thereafter	18,819
Total	$ 30,148

Lessee, Operating Sublease, Payment To Be Received, After Year Five

No definition available.

Name:	rgld_LesseeOperatingSubleasePaymentToBeReceivedAfterYearFive
Namespace Prefix:	rgld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Lessee, Operating Sublease, Payment To Be Received, Year Five

No definition available.

Name:	rgld_LesseeOperatingSubleasePaymentToBeReceivedYearFive
Namespace Prefix:	rgld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Lessee, Operating Sublease, Payment To Be Received, Year Four

No definition available.

Name:	rgld_LesseeOperatingSubleasePaymentToBeReceivedYearFour
Namespace Prefix:	rgld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Lessee, Operating Sublease, Payment To Be Received, Year One

No definition available.

Name:	rgld_LesseeOperatingSubleasePaymentToBeReceivedYearOne
Namespace Prefix:	rgld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Lessee, Operating Sublease, Payment To Be Received, Year Three

No definition available.

Name:	rgld_LesseeOperatingSubleasePaymentToBeReceivedYearThree
Namespace Prefix:	rgld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Lessee, Operating Sublease, Payment To Be Received, Year Two

No definition available.

Name:	rgld_LesseeOperatingSubleasePaymentToBeReceivedYearTwo
Namespace Prefix:	rgld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Lessee, Operating Sublease, Payments To Be Received

No definition available.

Name:	rgld_LesseeOperatingSubleasePaymentsToBeReceived
Namespace Prefix:	rgld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.