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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Feb. 28, 2015 | Mar. 31, 2015
Ilovitza |  |  |
Commitments and Contingencies |  |  |
Remaining commitment amount | $ 167.5 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |  |
Phoenix Gold Project |  |  |
Commitments and Contingencies |  |  |
Installment paid |  | 12.8 rgld_AgreementInstallmentPaid / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_PhoenixGoldProjectMember |
Remaining commitment amount |  |  | $ 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_PhoenixGoldProjectMember
Voisey's Bay | Canadian Minerals Partnership |  |  |
Commitments and Contingencies |  |  |
Percentage of ownership interest held in Labrador Nickel Royalty Limited Partnership ("LNRLP") |  |  | 89.99%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = rgld_CanadianMineralsPartnershipMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_VoiseysBayMember
Voisey's Bay | Altius |  |  |
Commitments and Contingencies |  |  |
Percentage of ownership interest held in Labrador Nickel Royalty Limited Partnership ("LNRLP") |  |  | 10.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = rgld_AltiusMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_VoiseysBayMember
Voisey's Bay | Voiseys Bay Holding Corporation |  |  |
Commitments and Contingencies |  |  |
Percentage of ownership interest held in Labrador Nickel Royalty Limited Partnership ("LNRLP") |  |  | 0.01%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = rgld_VoiseysBayHoldingCorporationMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_VoiseysBayMember

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