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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Ilovitza    
Commitments and Contingencies    
Remaining commitment amount $ 175.0us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= rgld_IlovitzaMember		  
Phoenix Gold Project    
Commitments and Contingencies    
Remaining commitment amount   $ 12.8us-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