ROYALTY AND STREAM INTERESTS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2016 USD ($) item	Dec. 31, 2014 USD ($)	Mar. 31, 2016 USD ($) item oz	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)
Royalty and stream interests
Cost	$ 3,531,565		$ 3,531,565			$ 2,647,976
Accumulated Depletion	(572,007)		(572,007)			(536,029)
Impairments	(96,118)		(96,118)			(28,339)
Net	2,863,440		2,863,440			2,083,608
Impairments of royalty and stream interests	96,118		96,118	$ 28,339
Impairments of royalty and stream interests and royalty receivables	98,973		98,588	31,335
Royalty receivables	20,233		20,233			37,681
Other
Royalty and stream interests
Impairments of royalty and stream interests	3,127		3,127	2,372
Phoenix Gold
Royalty and stream interests
Net	0		0
Inata
Royalty and stream interests
Net	$ 0		$ 0		$ 12,000
Inata | Avocet
Royalty and stream interests
Percentage of royalty interests acquired	2.50%		2.50%
Royalty receivables	$ 2,800		$ 2,800
Wolverine
Royalty and stream interests
Net	$ 0		$ 0		$ 5,300
Impairments of royalty and stream interests		$ 26,000
Allowance for royalty receivables		$ 3,000
Wolverine | Minimum
Royalty and stream interests
Percentage of royalty interests acquired	0.00%		0.00%
Wolverine | Maximum
Royalty and stream interests
Percentage of royalty interests acquired	9.445%		9.445%
Production Stage Royalty Interest
Royalty and stream interests
Cost	$ 881,872		$ 881,872			1,129,230
Accumulated Depletion	(474,684)		(474,684)			(500,834)
Impairments	(18,605)		(18,605)			(27,586)
Net	388,583		388,583			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	205,724		205,724			150,138
Accumulated Depletion	(85,671)		(85,671)			(76,141)
Net	120,053		120,053			73,997
Production Stage Royalty Interest | Penasquito
Royalty and stream interests
Cost	99,172		99,172			99,172
Accumulated Depletion	(29,439)		(29,439)			(24,555)
Net	69,733		69,733			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			34,612
Accumulated Depletion	(16,391)		(16,391)			(13,950)
Net	18,221		18,221			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			10,630
Accumulated Depletion	(9,987)		(9,987)			(9,933)
Net	643		643			697
Production Stage Royalty Interest | Other
Royalty and stream interests
Cost	531,734		531,734			495,763
Accumulated Depletion	(333,196)		(333,196)			(265,727)
Impairments	(18,605)		(18,605)			(27,586)
Net	$ 179,933		$ 179,933			202,450
Number of properties | item	1		1
Production Stage Royalty Interest | Inata
Royalty and stream interests
Impairments of royalty and stream interests	$ 11,982		$ 11,982
Allowance for royalty receivables	2,855		2,855
Production Stage Royalty Interest | Wolverine
Royalty and stream interests
Impairments of royalty and stream interests	5,307		5,307	25,967
Allowance for royalty receivables			(385)	$ 2,996
Production Stage Stream Interests
Royalty and stream interests
Cost	1,858,059		1,858,059
Accumulated Depletion	(97,170)		(97,170)
Net	1,760,889		1,760,889
Production Stage Stream Interests | Andacollo
Royalty and stream interests
Cost	388,182		388,182
Accumulated Depletion	(12,497)		(12,497)
Net	375,685		375,685
Production Stage Stream Interests | Mt. Milligan
Royalty and stream interests
Cost	783,046		783,046			783,046
Accumulated Depletion	(65,329)		(65,329)			(35,195)
Net	717,717		717,717			747,851
Production Stage Stream Interests | Pueblo Viejo
Royalty and stream interests
Cost	610,404		610,404
Accumulated Depletion	(13,344)		(13,344)
Net	597,060		597,060
Production Stage Stream Interests | Wassa, Bogoso and Prestea
Royalty and stream interests
Cost	76,427		76,427
Accumulated Depletion	(6,000)		(6,000)
Net	70,427		70,427
Production Stage Royalty and Stream Interests
Royalty and stream interests
Cost	2,739,931		2,739,931			1,912,276
Accumulated Depletion	(571,854)		(571,854)			(536,029)
Impairments	(18,605)		(18,605)			(27,586)
Net	2,149,472		2,149,472			1,348,661
Development Stage Royalty Interest
Royalty and stream interests
Cost	447,072		447,072			439,122
Net	447,072		447,072			439,122
Development Stage Royalty Interest | Pascua Lama
Royalty and stream interests
Cost	380,657		380,657			372,105
Net	380,657		380,657			372,105
Development Stage Royalty Interest | Other
Royalty and stream interests
Cost	66,415		66,415			67,017
Net	66,415		66,415			67,017
Development Stage Stream Interest
Royalty and stream interests
Cost	188,565		188,565			84,026
Accumulated Depletion	(153)		(153)
Impairments	(75,702)		(75,702)			(603)
Net	112,710		112,710			83,423
Development Stage Stream Interest | Rainy River
Royalty and stream interests
Cost	100,684		100,684
Net	100,684		100,684
Development Stage Stream Interest | Other
Royalty and stream interests
Cost	87,881		87,881			8,183
Accumulated Depletion	(153)		(153)
Impairments	(75,702)		(75,702)			(603)
Net	12,026		12,026			7,580
Development Stage Stream Interest | Phoenix Gold
Royalty and stream interests
Cost						75,843
Net						75,843
Impairments of royalty and stream interests	75,702		75,702
Development Stage Royalty and Stream Interest
Royalty and stream interests
Cost	635,637		635,637			523,148
Accumulated Depletion	(153)		(153)
Impairments	(75,702)		(75,702)			(603)
Net	559,782		559,782			522,545
Exploration Stage Royalty Interest
Royalty and stream interests
Cost	155,997		155,997			212,552
Impairments	(1,811)		(1,811)			(150)
Net	$ 154,186		$ 154,186			$ 212,402
Exploration Stage Royalty Interest | Other
Royalty and stream interests
Number of properties | item	3		3
Initial Royalty | RGLD Gold | Phoenix Gold | Rubicon Minerals Corporation
Royalty and stream interests
Percentage of royalty interests acquired	6.30%		6.30%
Gold delivered (in ounces) | oz			135,000
Subsequent Royalty | RGLD Gold | Phoenix Gold | Rubicon Minerals Corporation
Royalty and stream interests
Percentage of royalty interests acquired	3.15%		3.15%
Production Stage and Exploration Stage Royalty Interest | Other
Royalty and stream interests
Impairments of royalty and stream interests	$ 3,100