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SUBSEQUENT EVENTS (Details) $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 66 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 05, 2015 USD ($) payment oz | Jul. 20, 2015 USD ($) payment oz | Jul. 10, 2015 USD ($) $ / oz | Jul. 09, 2015 USD ($) km oz | Jan. 12, 2010 oz | Jul. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) oz | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2015 USD ($) oz | Jun. 30, 2014 USD ($) | Jun. 30, 2013 USD ($) | Jun. 30, 2015 oz
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of royalty interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,429 | $ 80,019 | $ 314,262 |
Royalty Revenue. |  |  |  |  |  |  | $ 73,579 | $ 74,110 | $ 61,304 | $ 69,026 | $ 70,142 | $ 57,748 | $ 52,785 | $ 56,487 | $ 278,019 | $ 237,162 | $ 289,224 |
RG Chile | CMCA | Carmen de Andacollo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold delivered (in ounces) | oz |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 259,000
Gold deliverable (in ounces) | oz |  |  |  |  |  |  | 651,000 |  |  |  |  |  |  |  | 651,000 |  |  | 651,000
RG Chile | CMCA | Carmen de Andacollo | Initial Royalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Net Value Royalty Interest, Percentage, Owned |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Gold delivered (in ounces) | oz |  |  |  |  | 910,000 |  |  |  |  |  |  |  |  |  |  |  |  |
RG Chile | CMCA | Carmen de Andacollo | Subsequent Royalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of royalty interests acquired |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | Barrick Gold | Pascua Lama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of royalty interests acquired |  |  | 0.22% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of royalty interests |  |  | $ 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty interests in Mineral Property, net (as a percent) |  |  | 5.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold price (in dollars per ounce) | $ / oz |  |  | 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | Barrick Gold | Pascua Lama | First Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining consideration payable |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | Barrick Gold | Pascua Lama | Second Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining consideration payable |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | BGC | Pueblo Viejo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase amount | $ 610,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | payment | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | BGC | Pueblo Viejo | First Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum quantity of silver with specified purchase price (in ounces) | oz | 23,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold delivered (in ounces) | oz | 550,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | BGC | Pueblo Viejo | Initial Royalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Net Value Royalty Interest, Percentage, Owned | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Net Value Royalty Silver Interest Percentage Owned | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum quantity of silver with specified purchase price (in ounces) | oz | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold delivered (in ounces) | oz | 990,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | BGC | Pueblo Viejo | Subsequent Royalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of royalty interests acquired | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of silver royalty interests acquired | 37.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | New Gold Inc | Rainy River |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase amount |  | $ 175,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | payment |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installment payable in conjunction with executive definitive documents |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installment payable upon meeting capital spending requirement |  | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital spending requirement (as a percent) |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | New Gold Inc | Rainy River | Initial Royalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Net Value Royalty Interest, Percentage, Owned |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Net Value Royalty Silver Interest Percentage Owned |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum quantity of silver with specified purchase price (in ounces) | oz |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold delivered (in ounces) | oz |  | 230,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | New Gold Inc | Rainy River | Subsequent Royalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of royalty interests acquired |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of silver royalty interests acquired |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | CMCA | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of mining to be eligible for concessions | km |  |  |  | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RGLD Gold | CMCA | Carmen de Andacollo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of produced payable gold to be purchased until agreed ounces have been delivered |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum quantity of gold with specified purchase price (in ounces) | oz |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of produced payable gold to be purchased after agreed ounces have been delivered |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed percentage of produced gold payable (as a percent) |  |  |  | 89.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per ounce as a percentage of monthly average gold price for the month preceding the delivery date |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of royalty interests |  |  |  | $ 525,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | RG Chile | CMCA | Carmen de Andacollo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase amount |  |  |  | 345,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from termination |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Revenue. |  |  |  |  |  | $ 9,700 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events. | Teck | CMCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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Name: | dei_LegalEntityAxis=rgld_TeckMember
Namespace Prefix: |
Data Type: | na
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