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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Feb. 25, 2019
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Commitments and Contingencies |  |
Maximum future additional payments upon satisfaction of certain conditions |  | $ 212,000
Khoemacau |  |
Commitments and Contingencies |  |
Maximum future additional payments upon satisfaction of certain conditions | $ 212,000 | $ 212,000
Ilovica |  |
Commitments and Contingencies |  |
Maximum future additional payments upon satisfaction of certain conditions | $ 163,750 |

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LossContingencyInformationAboutLitigationMattersAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=rgld_KhoemacauCopperProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=rgld_IlovicaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |