Represents amount payable in the future based on certain project construction decisions.

No definition available.

Name:	rgld_FuturePaymentPayableBasedOnCertainConditions
Namespace Prefix:	rgld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Volume of gold production delivery to be received after close.

+ References

No definition available.

+ Details

Name:	rgld_GoldProductionVolumeDeliveryReceived
Namespace Prefix:	rgld_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of gold interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	rgld_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold Volume of gold delivery for spot gold price paid.

+ References

No definition available.

+ Details

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Namespace Prefix:	rgld_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents percentage of net smelter return.

+ References

No definition available.

+ Details

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Namespace Prefix:	rgld_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of spot price paid.

+ References

No definition available.

+ Details

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Namespace Prefix:	rgld_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the quantity of gold produced or delivered under the terms of the agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	rgld_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the area of interest surrounding the presently owned mine, as well as any other mining concessions presently owned or acquired.

+ References

No definition available.

+ Details

Name:	rgld_RoyaltyAgreementMiningConcessionsAreaOfInterestRange
Namespace Prefix:	rgld_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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Name:	us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=rgld_NewcrestMiningMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=rgld_RedChrisMineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=rgld_ImperialMetalsCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=rgld_NxGoldMineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=rgld_InitialRoyaltyMember
Namespace Prefix:
Data Type:	na
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Namespace Prefix:
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- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=rgld_RedChrisMineMember
Namespace Prefix:
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SUBSEQUENT EVENTS (Details) $ in Thousands			12 Months Ended
SUBSEQUENT EVENTS (Details) $ in Thousands	Aug. 11, 2021 USD ($) ha	Aug. 06, 2021 USD ($) oz	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Subsequent events
Payment to acquire interest			$ 168,147	$ 155,985	$ 1,055
Subsequent Events \| Newcrest Mining [Member] \| Red Chris Mine
Subsequent events
Percentage of ownership interest	70.00%
Subsequent Events \| Imperial Metals Corporation [Member] \| Red Chris Mine
Subsequent events
Percentage of ownership interest	30.00%
Subsequent Events \| NX Gold Mine
Subsequent events
Payment to acquire interest		$ 100,000
Future payment based on project decisions		$ 10,000
Gold delivery received within 5 days of close \| oz		2,500
Subsequent Events \| NX Gold Mine \| Initial Royalty
Subsequent events
Gold interest (as a percent)		25.00%
Gold delivered (in ounces) \| oz		93,000
Spot price paid (as a percent)		20.00%
Gold produced delivery for spot gold price threshold \| oz		49,000
Subsequent Events \| NX Gold Mine \| Subsequent Royalty
Subsequent events
Gold interest (as a percent)		10.00%
Spot price paid (as a percent)		40.00%
Subsequent Events \| Red Chris Mine
Subsequent events
Payment to acquire interest	$ 165,000
Net Smelter Return ("NSR") (as a percent)	1.00%
Area of mining to be eligible for concessions \| ha	5,100