ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) $ in Thousands					6 Months Ended		12 Months Ended
	Aug. 11, 2021 USD ($) ha	Aug. 06, 2021 USD ($) oz	Jun. 07, 2021 USD ($)	Jan. 29, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Acquisitions
Payment to acquire interest					$ 281,066	$ 48,832	$ 168,147	$ 155,985	$ 1,055
Cost					3,899,867		3,618,802	3,553,950
Production stage royalty interest
Acquisitions
Cost					949,563		828,448	907,414
Exploration stage royalty interest
Acquisitions
Cost							343,214	315,516
Production stage stream interests
Acquisitions
Cost					2,419,936		2,111,423	$ 2,111,423
Red Chris
Acquisitions
Net smelter return (NSR) (as a percent)	1.00%
Area of mining to be eligible for concessions | ha	5,100
Payment to acquire interest	$ 165,000
Cost	165,000
Red Chris | Production stage royalty interest
Acquisitions
Cost	116,200				116,187
Red Chris | Exploration stage royalty interest
Acquisitions
Cost	$ 48,900				48,895
Red Chris | Newcrest Mining | Red Chris
Acquisitions
Joint venture ownership interest (as a percent)	70.00%
Red Chris | Imperial Metals Corporation | Red Chris
Acquisitions
Joint venture ownership interest (as a percent)	30.00%
NX
Acquisitions
Payment to acquire interest		$ 100,000
Cost		100,000
Future payment based on project decisions		10,000
NX | Production stage royalty interest
Acquisitions
Cost		54,900
NX | Exploration stage royalty interest
Acquisitions
Cost		$ 45,100
NX | Exploration Stage Stream Interests
Acquisitions
Cost					30,974
NX | Initial Royalty
Acquisitions
Gold interest (as a percent)		25.00%
Gold delivered (in ounces) | oz		93,000
Spot price paid (as a percent)		20.00%
Gold produced delivery for spot gold price threshold | oz		49,000
NX | Subsequent Royalty
Acquisitions
Gold interest (as a percent)		10.00%
Spot price paid (as a percent)		40.00%
Cote
Acquisitions
Net smelter return (NSR) (as a percent)			1.00%
Payment to acquire interest			$ 75,000
Royalty covering current reserves (as a percent)			70.00%
Cote | Exploration stage royalty interest
Acquisitions
Cost					$ 29,610		$ 29,610
Cote | Cote Gold Joint Venture | Cote
Acquisitions
Joint venture ownership interest (as a percent)			92.50%
Cote | IAMGOLD Corporation | Cote Gold Joint Venture
Acquisitions
Joint venture ownership interest (as a percent)			70.00%
Cote | Sumitomo Metal Mining | Cote Gold Joint Venture
Acquisitions
Joint venture ownership interest (as a percent)			30.00%
Cote | Third Party | Cote
Acquisitions
Joint venture ownership interest (as a percent)			7.50%
Alturas
Acquisitions
Payment to acquire interest				$ 11,000
Future payment based on project decisions				20,000
Alturas | Maximum
Acquisitions
Cost				41,000
Future payment upon first production				$ 10,000
Alturas | Gold
Acquisitions
Net smelter return (NSR) (as a percent)				1.06%
Alturas | Copper
Acquisitions
Net smelter return (NSR) (as a percent)				1.59%