STREAM AND ROYALTY INTERESTS, NET - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Cost	$ 3,883,794	$ 3,618,802
Accumulated Depletion	(1,407,164)	(1,356,644)
Net	2,476,630	2,262,158
Red Chris
Cost	165,000
NX
Cost	100,000
Total production stage stream and royalty interests
Cost	3,334,529	2,939,871
Accumulated Depletion	(1,407,164)	(1,356,644)
Net	1,927,365	1,583,227
Production stage stream interests
Cost	2,389,852	2,111,423
Accumulated Depletion	(838,221)	(796,299)
Net	1,551,631	1,315,124
Production stage stream interests | Mount Milligan
Cost	790,635	790,635
Accumulated Depletion	(320,831)	(300,378)
Net	469,804	490,257
Production stage stream interests | Pueblo Viejo
Cost	610,404	610,404
Accumulated Depletion	(252,167)	(243,706)
Net	358,237	366,698
Production stage stream interests | Andacollo
Cost	388,182	388,182
Accumulated Depletion	(134,661)	(131,578)
Net	253,521	256,604
Production stage stream interests | Khoemacau
Cost	223,496
Accumulated Depletion	(78)
Net	223,418
Production stage stream interests | Rainy River
Cost	175,727	175,727
Accumulated Depletion	(46,106)	(41,772)
Net	129,621	133,955
Production stage stream interests | Wassa
Cost	146,475	146,475
Accumulated Depletion	(81,958)	(78,865)
Net	64,517	67,610
Production stage stream interests | NX
Cost	54,900
Production stage stream interests | Other
Cost	54,933
Accumulated Depletion	(2,420)
Net	52,513
Production stage royalty interests
Cost	944,677	828,448
Accumulated Depletion	(568,943)	(560,345)
Net	375,734	268,103
Production stage royalty interests | Voisey's Bay
Cost	205,724	205,724
Accumulated Depletion	(111,535)	(109,850)
Net	94,189	95,874
Production stage royalty interests | Red Chris
Cost	116,105
Net	116,105
Production stage royalty interests | Penasquito
Cost	99,172	99,172
Accumulated Depletion	(51,552)	(50,176)
Net	47,620	48,996
Production stage royalty interests | Cortez
Cost	80,681	80,681
Accumulated Depletion	(21,368)	(19,128)
Net	59,313	61,553
Production stage royalty interests | Other
Cost	442,995	442,871
Accumulated Depletion	(384,488)	(381,191)
Net	58,507	61,680
Total development stage stream and royalty interests
Cost	112,214	335,717
Net	112,214	335,717
Development stage stream interests | Khoemacau
Cost		223,502
Net		223,502
Development stage stream interests | Cote
Cost	45,421
Net	45,421
Development stage stream interests | Other
Cost	12,037	12,037
Net	12,037	12,037
Development stage royalty interests | Cote
Cost		45,423
Net		45,423
Development stage royalty interests | Other
Cost	54,756	54,755
Net	54,756	54,755
Total exploration stage stream and royalty interests
Cost	437,051
Net	437,051
Exploration stage stream interest | NX
Cost	45,067
Net	45,067
Exploration stage royalty interests
Cost		343,214
Net		343,214
Exploration stage royalty interests | Red Chris
Cost	48,895
Net	48,895
Exploration stage royalty interests | Cote
Cost	29,610	29,610
Net	29,610	29,610
Exploration stage royalty interests | Pascua-Lama
Cost	177,690	177,690
Net	177,690	177,690
Exploration stage royalty interests | Other
Cost	135,789	135,914
Net	$ 135,789	$ 135,914