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OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 item | Jun. 30, 2014 | Sep. 30, 2014
Minimum number of metals produced from a mine of which right to purchase all or a portion available in exchange for upfront deposit |  | 1 rgld_MinimumNumberOfMetalsProducedFromMineOfWhichRightToPurchaseInAllOrPortionAvailableInExchangeForUpfrontDeposit |  |
Carrying value for royalty interest | $ 2,067,152 us-gaap_MineralPropertiesNet | $ 2,067,152 us-gaap_MineralPropertiesNet | $ 2,109,067 us-gaap_MineralPropertiesNet |
Impairment of royalty and stream interests | 26,570 us-gaap_AssetImpairmentCharges | 28,339 us-gaap_AssetImpairmentCharges |  |
Impaired mining asset |  |  |  |
Carrying value for royalty interest |  |  |  | 0 us-gaap_MineralPropertiesNet / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = rgld_MiningAssetMember
Production Stage Royalty Interest |  |  |  |
Carrying value for royalty interest | 631,219 us-gaap_MineralPropertiesNet / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ProductionStageRoyaltyInterestMember | 631,219 us-gaap_MineralPropertiesNet / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ProductionStageRoyaltyInterestMember | 686,857 us-gaap_MineralPropertiesNet / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ProductionStageRoyaltyInterestMember |
Exploration Stage Royalty Interest |  |  |  |
Carrying value for royalty interest | $ 165,702 us-gaap_MineralPropertiesNet / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ExplorationStageRoyaltyInterestMember | $ 165,702 us-gaap_MineralPropertiesNet / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ExplorationStageRoyaltyInterestMember | $ 164,209 us-gaap_MineralPropertiesNet / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = rgld_ExplorationStageRoyaltyInterestMember |

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- Definition Represents the minimum number of metals produced from a mine of which the right to purchase all or a portion is available in exchange for upfront deposit. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Mineral properties, net of adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64895-109465 + Details
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- Details
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- Details
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- Details
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