ACQUISITION (Details) $ / shares in Units, shares in Millions							5 Months Ended	6 Months Ended
	Dec. 30, 2015 USD ($) payment	Sep. 29, 2015 USD ($) oz	Jul. 28, 2015 USD ($) oz $ / shares shares	Jul. 20, 2015 USD ($) oz	Jul. 09, 2015 USD ($) km oz	Dec. 01, 2010 oz	Dec. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)
Acquisition of Royalty Interest in Mineral Properties
Carrying value							$ 3,530,294,000	$ 3,530,294,000	$ 2,647,976,000
Royalty and stream interests, net							2,996,421,000	2,996,421,000	2,083,608,000
Chile
Acquisition of Royalty Interest in Mineral Properties
Royalty and stream interests, net							835,297,000	835,297,000	$ 653,019,000
Golden Star
Acquisition of Royalty Interest in Mineral Properties
Gross loans			$ 20,000,000
Term of loan			4 years
Quarterly interest rate based on average gold rate divided by 10,000			62.50%
Denominator used in calculation of quarterly interest rate			$ 10,000
Number of shares of common stock that can be purchased by the warrants | shares			5
Grant date fair value on exercise of warrants			$ 800,000
Term of warrants			4 years
Exercise price of warrants | $ / shares			$ 0.27
Golden Star | Maximum
Acquisition of Royalty Interest in Mineral Properties
Interest rate (as a percent)			11.50%
Golden Star | Other assets
Acquisition of Royalty Interest in Mineral Properties
Gross loans			$ 20,000,000
Golden Star | Wassa, Bogoso and Prestea | First Condition
Acquisition of Royalty Interest in Mineral Properties
Investment by third party	$ 5,000,000
BGC | Pueblo Viejo | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Gold delivered (in ounces) | oz		990,000
RGLD Gold | Carmen de Andacollo | Royalty and stream interests, net
Acquisition of Royalty Interest in Mineral Properties
Carrying value					$ 388,200,000
RGLD Gold | Golden Star | Wassa, Bogoso and Prestea
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount	145,000,000		$ 130,000,000
Additional investment	$ 15,000,000
Number of installments | payment	4
Allocation to production stage steam interest								62,500,000
Allocation to exploration stage steam interest								13,700,000
First, second and third installments	$ 20,000,000
Fourth installment	10,000,000
Cash paid for acquisition of royalty interests	20,000,000						$ 75,000,000
RGLD Gold | Golden Star | Wassa, Bogoso and Prestea | Royalty and stream interests, net
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount								75,000,000
RGLD Gold | Golden Star | Wassa, Bogoso and Prestea | First Condition
Acquisition of Royalty Interest in Mineral Properties
Total investment on subsidiary	150,000,000
Additional investment	$ 5,000,000
Percentage of royalty interests acquired			10.90%
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery			20.00%
Gold delivered (in ounces) | oz			250,000
RGLD Gold | Golden Star | Wassa, Bogoso and Prestea | Second Condition
Acquisition of Royalty Interest in Mineral Properties
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery			30.00%
RGLD Gold | Golden Star | Wassa, Bogoso and Prestea | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired			9.25%
Gold delivered (in ounces) | oz			240,000
RGLD Gold | Golden Star | Wassa, Bogoso and Prestea | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired			10.50%
RGLD Gold | Golden Star | Wassa, Bogoso and Prestea | Subsequent Two Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired			5.50%
RGLD Gold | BGC | Pueblo Viejo
Acquisition of Royalty Interest in Mineral Properties
Ownership interest (as a percent)		60.00%
Total purchase amount		$ 610,000,000
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery		60.00%
RGLD Gold | BGC | Pueblo Viejo | Royalty and stream interests, net
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount								610,000,000
RGLD Gold | BGC | Pueblo Viejo | First Condition
Acquisition of Royalty Interest in Mineral Properties
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
RGLD Gold | BGC | Pueblo Viejo | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired		7.50%
Percentage of silver royalty interests acquired		75.00%
Maximum quantity of silver with specified purchase price (in ounces) | oz		50,000,000
RGLD Gold | BGC | Pueblo Viejo | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired		3.75%
Percentage of silver royalty interests acquired		37.50%
RGLD Gold | New Gold Inc | Rainy River
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount				$ 175,000,000
Installment payable upon meeting capital spending requirement				$ 75,000,000
Capital spending requirement (as a percent)				60.00%
Cash paid for acquisition of royalty interests				$ 100,000,000
RGLD Gold | New Gold Inc | Rainy River | Royalty and stream interests, net
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount								$ 100,000,000
RGLD Gold | New Gold Inc | Rainy River | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired				6.50%
Percentage of silver royalty interests acquired				60.00%
Maximum quantity of silver with specified purchase price (in ounces) | oz				3,100,000
Gold delivered (in ounces) | oz				230,000
RGLD Gold | New Gold Inc | Rainy River | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired				3.25%
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery				25.00%
Percentage of silver royalty interests acquired				30.00%
RGLD Gold | CMCA | Carmen de Andacollo
Acquisition of Royalty Interest in Mineral Properties
Percentage of produced payable gold to be purchased until 48,000 ounces have been delivered					100.00%
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					$ 525,000,000
Percentage of produced payable gold to be purchased after 48,000 ounces have been delivered					50.00%
RGLD Gold | CMCA | Carmen de Andacollo | Chile
Acquisition of Royalty Interest in Mineral Properties
Maximum quantity of gold with specified purchase price (in ounces) | oz					900,000
RGLD Gold | CMCA | Carmen de Andacollo | Maximum
Acquisition of Royalty Interest in Mineral Properties
Area of mining to be eligible for concessions | km					1.5
RG Chile | Carmen de Andacollo
Acquisition of Royalty Interest in Mineral Properties
Royalty and stream interests, net					$ 207,500,000
RG Chile | CMCA | Carmen de Andacollo
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount					$ 345,000,000
RG Chile | CMCA | Carmen de Andacollo | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired						75.00%
Gold delivered (in ounces) | oz						910,000
RG Chile | CMCA | Carmen de Andacollo | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired						50.00%
Teck | CMCA
Acquisition of Royalty Interest in Mineral Properties
Ownership interest (as a percent)					90.00%