ACQUISITION (Details) shares in Millions							1 Months Ended		12 Months Ended
	Jul. 28, 2015 USD ($) item oz shares	Jan. 08, 2015 USD ($)	Oct. 20, 2014 USD ($) item oz	Mar. 20, 2014 USD ($)	Feb. 11, 2014 USD ($) item oz	Jan. 07, 2014 USD ($) item mi	Feb. 28, 2015 USD ($)	Jan. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Jan. 02, 2014 USD ($)	Dec. 31, 2013	Aug. 31, 2013 USD ($)
Acquisition of Royalty Interest in Mineral Properties
Cash paid for acquisition of royalty interests									$ 60,429,000	$ 80,019,000	$ 314,262,000
Denver Mining Finance Company | CVP
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount													$ 11,500,000
Peak Gold | Royal Alaska
Acquisition of Royalty Interest in Mineral Properties
Fair value of non-controlling interest									45,700,000
Ilovitza
Acquisition of Royalty Interest in Mineral Properties
Remaining commitment amount									167,500,000
Ilovitza | RGLD Gold
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount			$ 175,000,000
Number of installments | item			2
Feasibility costs			$ 15,000,000
Construction costs			$ 160,000,000
Cash paid for acquisition of royalty interests									$ 7,500,000
Ilovitza | RGLD Gold | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Gold delivered (in ounces) | oz			525,000
Percentage of royalty interests acquired			25.00%
Ilovitza | RGLD Gold | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired			12.50%
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery			25.00%
Purchase price per ounce of gold as percentage of spot price at the time of delivery			25.00%
Ilovitza | RGLD Gold | First Condition
Acquisition of Royalty Interest in Mineral Properties
Feasibility costs			$ 7,500,000
Ilovitza | RGLD Gold | Second Condition
Acquisition of Royalty Interest in Mineral Properties
Feasibility costs			$ 7,500,000
Tetlin
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount												$ 6,000,000
Tetlin | NSR Royalty 1
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired												2.00%
Tetlin | NSR Royalty 2
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired												3.00%
Tetlin | Peak Gold | Royal Alaska
Acquisition of Royalty Interest in Mineral Properties
Payments to acquire interest in joint venture		$ 5,000,000
Minimum percentage of membership interest required to be manager									40.00%
Tetlin | Peak Gold | Royal Alaska | Maximum
Acquisition of Royalty Interest in Mineral Properties
Percentage of membership interest that can be obtained		40.00%
Amount that can be contributed to purchase membership interest		$ 30,000,000
Tetlin | Peak Gold | Contango
Acquisition of Royalty Interest in Mineral Properties
Membership interest controlled		100.00%
Phoenix Gold
Acquisition of Royalty Interest in Mineral Properties
Installments paid in conjunction with executive definitive documents							$ 12,800,000
Remaining commitment amount									$ 0
Phoenix Gold | RGLD Gold
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount					$ 75,000,000
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery					25.00%
Number of installments the purchase price of refined gold is payable | item					5
Installments paid in conjunction with executive definitive documents				$ 20,000,000	$ 10,000,000
Installment payment for each of the third, fourth and fifth installments									$ 15,000,000
Percentage of produced payable gold to be purchased until 48,000 ounces have been delivered					6.30%
Maximum quantity of gold with specified purchase price (in ounces) | oz					135,000
Percentage of produced payable gold to be purchased after 135,000 ounces have been delivered					3.15%
Purchase price per ounce of gold as percentage of spot price at the time of delivery					25.00%
Maximum amount of senior debt prior to purchase price per ounce of gold of is reduced					$ 50,000,000
Factor to determine purchase price per ounce of gold at the time of delivery if senior secured debt exceeds stated level					5.40%
Denominator to determine purchase price per ounce of gold at the time of delivery if senior secured debt exceeds stated level					$ 50,000,000
Goldrush
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount						$ 8,000,000
Number of installments the purchase price of refined gold is payable | item						6
Cash paid for acquisition of royalty interests						$ 1,000,000		$ 1,000,000
Royalty interests in Mineral Property, net (as a percent)						1.00%
Remaining commitment amount						$ 6,000,000
Distance of mining property from Cortez mine | mi						4
El Morro | Goldcorp, Inc
Acquisition of Royalty Interest in Mineral Properties
Royalty interests in Mineral Property, net (as a percent)															70.00%
El Morro | Chilean Subsidiary
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired															70.00%
Total purchase amount															$ 35,000,000
Royalty interests in Mineral Property, net (as a percent)															2.00%
El Morro | New Gold Inc
Acquisition of Royalty Interest in Mineral Properties
Royalty interests in Mineral Property, net (as a percent)															30.00%
Cortez | CVP
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired													1.25%
Cortez, excluding the Crossroad Claims | Denver Mining Finance Company | CVP
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired													1.014%	0.39%
Cortez Crossroad Claim | Denver Mining Finance Company | CVP
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired													0.618%	0.00%
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	5.0
Term of warrants	4 years
Trading period used to calculate premium on share price	10 days
Agreement Premium On Share Price, Number Of Days Before Announcement Of Transactions Used In Calculation	2 days
Premium on share price as a percentage of the volume weighted average trading price of common shares	30.00%
Golden Star | Minimum
Acquisition of Royalty Interest in Mineral Properties
Prepayment on excess cash flow (as a percent)	25.00%
Golden Star | Maximum
Acquisition of Royalty Interest in Mineral Properties
Interest rate (as a percent)	$ 11.5
Prepayment on excess cash flow (as a percent)	50.00%
Golden Star | Ghana Mines | RGLD Gold
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount	$ 130,000,000
Installment payable in conjunction with executive definitive documents	40,000,000
First Installment Scheduled Payment	15,000,000
Second Installment Scheduled Payment	30,000,000
Third, Fourth, and Fifth Scheduled Payments	$ 15,000,000
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery	30.00%
Number of installments the purchase price of refined gold is payable | item	5
Purchase price per ounce of gold as percentage of spot price at the time of delivery	30.00%
Golden Star | Ghana Mines | RGLD Gold | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Gold delivered (in ounces) | oz	185,000
Percentage of royalty interests acquired	8.50%
Golden Star | Ghana Mines | RGLD Gold | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired	5.00%
Gold delivered (in ounces) | oz	22,500
Golden Star | Ghana Mines | RGLD Gold | Subsequent Two Royalty
Acquisition of Royalty Interest in Mineral Properties
Percentage of royalty interests acquired	3.00%
Golden Star | Ghana Mines | RGLD Gold | First Condition
Acquisition of Royalty Interest in Mineral Properties
Gold delivered (in ounces) | oz	207,500
Purchase price per ounce of the commodities as percentage of spot price at the time of delivery	20.00%
Purchase price per ounce of gold as percentage of spot price at the time of delivery	20.00%