ACQUISITIONS (Details) $ / shares in Units, km in Millions									1 Months Ended	12 Months Ended
	Jun. 29, 2018 USD ($)	Jun. 28, 2018 $ / shares shares	Sep. 19, 2016 USD ($)	Dec. 30, 2015 USD ($)	Sep. 29, 2015 USD ($) oz	Jul. 28, 2015 USD ($) oz $ / shares shares	Jul. 20, 2015 USD ($) oz	Jul. 09, 2015 USD ($) km oz	Nov. 30, 2016 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)
Acquisition of Royalty Interest in Mineral Properties
Repayment of Golden Star term loan										$ 20,000,000
Funds received for royalty termination											$ 345,000,000
Cost										3,636,306,000		$ 3,624,495,000
Golden Star
Acquisition of Royalty Interest in Mineral Properties
Gross loans						$ 20,000,000
Term of loan						4 years
Common stock that can be purchased by warrants (in shares) | shares						5,000,000
Grant date fair value of warrants						$ 800,000
Quarterly interest rate based on average gold rate						62.50%
Denominator used in calculation of quarterly interest rate						$ 10,000
Term of warrants						4 years
Exercise price of warrants | $ / shares						$ 0.27
Repayment of Golden Star term loan	$ 20,000,000
Maximum | Golden Star
Acquisition of Royalty Interest in Mineral Properties
Interest rate (as a percent)						11.50%
Mara Rosa
Acquisition of Royalty Interest in Mineral Properties
Net smelter return (NSR) (as a percent)	1.75%	1.00%
Consideration paid	$ 10,800,000
Cortez
Acquisition of Royalty Interest in Mineral Properties
NVR (as a percent)			3.75%
Consideration paid			$ 70,000,000
Cortez Crossroad Claim
Acquisition of Royalty Interest in Mineral Properties
NVR (as a percent)			4.52%
Consideration paid			$ 59,800,000
GSR royalty (as a percent)			5.00%
Cortez, excluding the Crossroad Claims
Acquisition of Royalty Interest in Mineral Properties
NVR (as a percent)			4.91%
Consideration paid			$ 10,200,000
GSR royalty (as a percent)			5.71%
CORE
Acquisition of Royalty Interest in Mineral Properties
Shares acquired | shares		682,556
Share price | $ / shares		$ 26
Shares expected to acquire | shares		127,188
Unrealized loss on shares										1,500,000
Pueblo Viejo
Acquisition of Royalty Interest in Mineral Properties
Consideration paid					$ 610,000,000
Purchase price per ounce of silver (as a percent)					60.00%
Pueblo Viejo | Barrick
Acquisition of Royalty Interest in Mineral Properties
Ownership interest (as a percent)					60.00%
Pueblo Viejo | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)					7.50%
Gold delivered (in ounces) | oz					990,000
Silver royalty interests acquired (as a percent)					75.00%
Minimum silver recovery (as a percent)					70.00%
Silver delivered (in ounces) | oz					50,000,000
Pueblo Viejo | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)					3.75%
Silver royalty interests acquired (as a percent)					37.50%
Pueblo Viejo | First Condition
Acquisition of Royalty Interest in Mineral Properties
Gold delivered (in ounces) | oz					550,000
Silver delivered (in ounces) | oz					23,100,000
Purchase price per ounce of silver (as a percent)					30.00%
Pueblo Viejo | Second Condition
Acquisition of Royalty Interest in Mineral Properties
Purchase price per ounce of gold (as a percent)					60.00%
Wassa and Prestea
Acquisition of Royalty Interest in Mineral Properties
Consideration paid				$ 15,000,000		$ 130,000,000
Remaining consideration payable										0
Cost				$ 145,000,000
Wassa and Prestea | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)						9.25%
Gold delivered (in ounces) | oz						240,000
Wassa and Prestea | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)						10.50%
Wassa and Prestea | First Condition
Acquisition of Royalty Interest in Mineral Properties
Purchase price per ounce of gold (as a percent)						20.00%
Wassa and Prestea | Second Condition
Acquisition of Royalty Interest in Mineral Properties
Purchase price per ounce of gold (as a percent)						30.00%
Wassa and Prestea | Subsequent Two Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)						5.50%
Rainy River
Acquisition of Royalty Interest in Mineral Properties
Consideration paid							$ 175,000,000
Cash paid for acquisition of royalty interests							$ 100,000,000		$ 75,000,000
Remaining consideration payable										0
Rainy River | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)							6.50%
Gold delivered (in ounces) | oz							230,000
Silver royalty interests acquired (as a percent)							60.00%
Silver delivered (in ounces) | oz							3,100,000
Rainy River | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)							3.25%
Purchase price per ounce of gold (as a percent)							25.00%
Silver royalty interests acquired (as a percent)							30.00%
Carmen de Andacollo
Acquisition of Royalty Interest in Mineral Properties
Consideration paid								$ 525,000,000
Royalty interests acquired (as a percent)								89.00%
Purchase price per ounce of gold (as a percent)								15.00%
Area of mining to be eligible for concessions | km								1.5
Cost										$ 388,200,000
Carmen de Andacollo | Teck
Acquisition of Royalty Interest in Mineral Properties
Ownership interest (as a percent)								90.00%
Carmen de Andacollo | Termination Agreement
Acquisition of Royalty Interest in Mineral Properties
Gain on contract termination								$ 0
Funds received for royalty termination								345,000,000
Cost								$ 207,500,000
Carmen de Andacollo | Initial Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)								100.00%
Gold delivered (in ounces) | oz								900,000
Carmen de Andacollo | Initial Royalty | Termination Agreement
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)								75.00%
Gold delivered (in ounces) | oz								910,000
Carmen de Andacollo | Subsequent Royalty
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)								50.00%
Carmen de Andacollo | Subsequent Royalty | Termination Agreement
Acquisition of Royalty Interest in Mineral Properties
Royalty interests acquired (as a percent)								50.00%