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OPERATIONS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS (Details) | 9 Months Ended
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Mar. 31, 2015 item
OPERATIONS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS |
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

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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
Name: | rgld_MinimumNumberOfMetalsProducedFromMineOfWhichRightToPurchaseInAllOrPortionAvailableInExchangeForUpfrontDeposit
Namespace Prefix: | rgld_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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