ROYALTY AND STREAM INTERESTS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Royalty and stream interests
Cost	$ 3,506,446	$ 2,647,976
Accumulated Depletion	(493,494)	(536,029)
Impairments		(28,339)
Net	3,012,952	2,083,608
Production Stage Royalty Interest
Royalty and stream interests
Cost	826,286	1,129,230
Accumulated Depletion	(445,765)	(500,834)
Impairments		(27,586)
Net	380,521	600,810
Production Stage Royalty Interest | Andacollo
Royalty and stream interests
Cost		272,998
Accumulated Depletion		(65,467)
Net		207,531
Production Stage Royalty Interest | Voisey's Bay
Royalty and stream interests
Cost	150,138	150,138
Accumulated Depletion	(79,989)	(76,141)
Net	70,149	73,997
Production Stage Royalty Interest | Penasquito
Royalty and stream interests
Cost	99,172	99,172
Accumulated Depletion	(26,579)	(24,555)
Net	72,593	74,617
Production Stage Royalty Interest | Mulatos
Royalty and stream interests
Cost		48,092
Accumulated Depletion		(32,313)
Net		15,779
Production Stage Royalty Interest | Holt
Royalty and stream interests
Cost	34,612	34,612
Accumulated Depletion	(14,837)	(13,950)
Net	19,775	20,662
Production Stage Royalty Interest | Robinson
Royalty and stream interests
Cost		17,825
Accumulated Depletion		(12,748)
Net		5,077
Production Stage Royalty Interest | Cortez
Royalty and stream interests
Cost	10,630	10,630
Accumulated Depletion	(9,955)	(9,933)
Net	675	697
Production Stage Royalty Interest | Other
Royalty and stream interests
Cost	531,734	495,763
Accumulated Depletion	(314,405)	(265,727)
Impairments		(27,586)
Net	217,329	202,450
Production Stage Stream Interests
Royalty and stream interests
Cost	1,903,516
Accumulated Depletion	(47,729)
Net	1,855,787
Production Stage Stream Interests | Andacollo
Royalty and stream interests
Cost	388,181
Accumulated Depletion	(4,215)
Net	383,966
Production Stage Stream Interests | Mt. Milligan
Royalty and stream interests
Cost	783,046	783,046
Accumulated Depletion	(42,498)	(35,195)
Net	740,548	747,851
Production Stage Stream Interests | Pueblo Viejo
Royalty and stream interests
Cost	610,367
Net	610,367
Production Stage Stream Interests | Wassa, Bogoso and Prestea
Royalty and stream interests
Cost	46,069
Accumulated Depletion	(990)
Net	45,079
Production Stage Stream Interests | Other
Royalty and stream interests
Cost	75,853
Accumulated Depletion	(26)
Net	75,827
Production Stage Royalty and Stream Interests
Royalty and stream interests
Cost	2,729,802	1,912,276
Accumulated Depletion	(493,494)	(536,029)
Impairments		(27,586)
Net	2,236,308	1,348,661
Development Stage Royalty Interest
Royalty and stream interests
Cost	447,071	439,122
Net	447,071	439,122
Development Stage Royalty Interest | Pascua Lama
Royalty and stream interests
Cost	380,657	372,105
Net	380,657	372,105
Development Stage Royalty Interest | Other
Royalty and stream interests
Cost	66,414	67,017
Net	66,414	67,017
Development Stage Stream Interest
Royalty and stream interests
Cost	108,876	84,026
Impairments		(603)
Net	108,876	83,423
Development Stage Stream Interest | Phoenix Gold
Royalty and stream interests
Cost		75,843
Net		75,843
Development Stage Stream Interest | Rainy River
Royalty and stream interests
Cost	100,673
Net	100,673
Development Stage Stream Interest | Other
Royalty and stream interests
Cost	8,203	8,183
Impairments		(603)
Net	8,203	7,580
Development Stage Royalty and Stream Interest
Royalty and stream interests
Cost	555,947	523,148
Impairments		(603)
Net	555,947	522,545
Exploration Stage Royalty Interest
Royalty and stream interests
Cost	210,584	212,552
Impairments		(150)
Net	210,584	$ 212,402
Exploration Stage Stream Interest Member
Royalty and stream interests
Cost	10,113
Net	$ 10,113