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ACQUISITION (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended |
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Oct. 20, 2014 item | Sep. 30, 2014
Ilovitza | RGLD Gold AG |  |
Acquisition of Royalty Interest in Mineral Properties |  |
Total purchase amount | $ 175.0 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Number of installments | 2 rgld_OptionAgreementOptionToAcquireRoyaltyPurchasePricePayableNumberOfInstallments / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Feasibility costs | 15.0 rgld_FeasibilityCosts / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Construction costs | 160.0 rgld_ConstructionCosts / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Ilovitza | RGLD Gold AG | First Conditions |  |
Acquisition of Royalty Interest in Mineral Properties |  |
Feasibility costs | 7.5 rgld_FeasibilityCosts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ConditionOneMember / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Euromax required contribution | 5 rgld_CounterpartyContribution / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ConditionOneMember / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Ilovitza | RGLD Gold AG | Second Conditions |  |
Acquisition of Royalty Interest in Mineral Properties |  |
Feasibility costs | 7.5 rgld_FeasibilityCosts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ConditionTwoMember / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Ilovitza | RGLD Gold AG | Initial Royalty |  |
Acquisition of Royalty Interest in Mineral Properties |  |
Percentage of royalty interests acquired | 25.00%rgld_RelatedPartyNetValueRoyaltyInterestPercentageOwned / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_InitialRoyaltyMember / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Gold delivered (in ounces) | 525,000 rgld_QuantityOfGold / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_InitialRoyaltyMember / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Ilovitza | RGLD Gold AG | Subsequent Royalty |  |
Acquisition of Royalty Interest in Mineral Properties |  |
Percentage of royalty interests acquired | 12.50%rgld_RelatedPartyNetValueRoyaltyInterestPercentageOwned / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_SubsequentRoyaltyMember / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Purchase price per ounce of gold as percentage of spot price at the time of delivery | 25.00%rgld_RoyaltyAcquisitionPurchasePricePerOunceAsPercentageOfSpotPriceAtTimeOfDelivery / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_SubsequentRoyaltyMember / dei_LegalEntityAxis = rgld_RGLDGoldAGMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_IlovitzaMember |
Tetlin |  |
Acquisition of Royalty Interest in Mineral Properties |  |
Total purchase amount |  | $ 6.0 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_TetlinMember
Tetlin | NSR Royalty 1 |  |
Acquisition of Royalty Interest in Mineral Properties |  |
Percentage of royalty interests acquired |  | 2.00%rgld_RoyaltyAcquisitionPercentageOfRoyaltyInterestsAcquired / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_NSRRoyaltyOption1Member / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_TetlinMember
Tetlin | NSR Royalty 2 |  |
Acquisition of Royalty Interest in Mineral Properties |  |
Percentage of royalty interests acquired |  | 3.00%rgld_RoyaltyAcquisitionPercentageOfRoyaltyInterestsAcquired / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_NSRRoyaltyOption2Member / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_TetlinMember

X
- Definition Represents costs related to project construction. + References No definition available. + Details
Name: | rgld_ConstructionCosts
Namespace Prefix: | rgld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents required contributions from the counterparty per the agreement. + References No definition available. + Details
Name: | rgld_CounterpartyContribution
Namespace Prefix: | rgld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents costs related to studying the feasibility of a project. + References No definition available. + Details
Name: | rgld_FeasibilityCosts
Namespace Prefix: | rgld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of installments in which the purchase price of royalty is payable. + References No definition available. + Details
Name: | rgld_OptionAgreementOptionToAcquireRoyaltyPurchasePricePayableNumberOfInstallments
Namespace Prefix: | rgld_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the quantity of gold produced or delivered under the terms of the agreement. + References No definition available. + Details
Name: | rgld_QuantityOfGold
Namespace Prefix: | rgld_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net value royalty interest percentage owned as of the reporting date by a related party of the reporting entity. + References No definition available. + Details
Name: | rgld_RelatedPartyNetValueRoyaltyInterestPercentageOwned
Namespace Prefix: | rgld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of royalty interests acquired by the entity. + References No definition available. + Details
Name: | rgld_RoyaltyAcquisitionPercentageOfRoyaltyInterestsAcquired
Namespace Prefix: | rgld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the purchase price of gold per ounce as percentage of spot price at the time of delivery. + References No definition available. + Details
Name: | rgld_RoyaltyAcquisitionPurchasePricePerOunceAsPercentageOfSpotPriceAtTimeOfDelivery
Namespace Prefix: | rgld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=rgld_IlovitzaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=rgld_TetlinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |