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SUBSEQUENT EVENT (Details) (Subsequent Events, Peak Gold, Tetlin, USD $) In Millions, unless otherwise specified | 0 Months Ended
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Jan. 08, 2015
Royal Alaska |
Subsequent event |
Payments to Acquire Interest in Joint Venture | $ 5.0 us-gaap_PaymentsToAcquireInterestInJointVenture / dei_LegalEntityAxis = rgld_RoyalAlaskaLlcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_TetlinMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rgld_PeakGoldJointVentureMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Royal Alaska | Maximum |
Subsequent event |
Percentage of membership interest that can be obtained | 40.00%rgld_JointVentureAgreementRightToObtainMembershipInterestPercentage / dei_LegalEntityAxis = rgld_RoyalAlaskaLlcMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_TetlinMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rgld_PeakGoldJointVentureMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Amount that can be contributed to purchase membership interest | $ 30.0 rgld_JointVentureAgreementRightToObtainMembershipInterestContributions / dei_LegalEntityAxis = rgld_RoyalAlaskaLlcMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_TetlinMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rgld_PeakGoldJointVentureMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Contango |
Subsequent event |
Membership interest controlled | 100.00%rgld_MembershipInterestPercentageControlled / dei_LegalEntityAxis = rgld_ContangoMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rgld_TetlinMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rgld_PeakGoldJointVentureMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Represents the right of the contributed amount to purchase membership interest pursuant to the joint venture agreement. + References No definition available. + Details
Name: | rgld_JointVentureAgreementRightToObtainMembershipInterestContributions
Namespace Prefix: | rgld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the right to obtain membership rights pursuant to the joint venture agreement. + References No definition available. + Details
Name: | rgld_JointVentureAgreementRightToObtainMembershipInterestPercentage
Namespace Prefix: | rgld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of membership interest controlled. + References No definition available. + Details
Name: | rgld_MembershipInterestPercentageControlled
Namespace Prefix: | rgld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireInterestInJointVenture
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Period Type: | duration