SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ADOPTED AND ISSUED ACCOUNTING PRONOUNCEMENTS (Details 2) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016 USD ($) $ / oz	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2016 USD ($) segment $ / oz	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Long Lived Assets and Pre-Tax Income by Geographical Information
Number of reportable segments | segment									2
Stream and royalty interests, net	$ 2,848,087				$ 2,083,608				$ 2,848,087	$ 2,083,608
Revenue	$ 94,129	$ 93,487	$ 98,118	$ 74,056	73,579	$ 74,110	$ 61,304	$ 69,026	359,790	278,019	$ 237,162
Cost of sales									70,979	33,450	9,158
Net Revenue									$ 288,811	244,569	228,004
Cost of Sales
Cash payment for each ounce of gold (in dollars per ounce) | $ / oz	435								435
Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	$ 1,038,258				1,074,779				$ 1,038,258	1,074,779
Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	823,525				653,019				823,525	653,019
Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	588,502								588,502
Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	118,899				131,742				118,899	131,742
United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	102,385				110,286				102,385	110,286
Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	89,293				12,760				89,293	12,760
Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	42,547				50,119				42,547	50,119
Other
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	44,678				50,903				44,678	50,903
Stream Interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	1,868,715				831,274				1,868,715	831,274
Revenue									238,028	94,104	27,209
Cost of sales									70,979	33,450	9,158
Net Revenue									167,049	60,654	18,051
Stream Interest | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	809,692				823,091				809,692	823,091
Revenue									125,755	94,104
Cost of sales									47,417	33,450
Net Revenue									78,338	60,654
Stream Interest | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	369,896								369,896
Revenue									49,243
Cost of sales									7,280
Net Revenue									41,963
Stream Interest | Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	588,502								588,502
Revenue									39,684
Cost of sales									11,625
Net Revenue									28,059
Stream Interest | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	88,596								88,596
Revenue									23,346
Cost of sales									4,657
Net Revenue									18,689
Stream Interest | Other
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	12,029				8,183				12,029	8,183
Royalty Interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	979,372				1,252,334				979,372	1,252,334
Revenue									121,762	183,915	209,953
Net Revenue									121,762	183,915	209,953
Royalty Interest | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	228,566				251,688				228,566	251,688
Revenue									30,676	37,496	54,277
Net Revenue									30,676	37,496	54,277
Royalty Interest | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	453,629				653,019				453,629	653,019
Revenue									84	39,508	50,733
Net Revenue									84	39,508	50,733
Royalty Interest | Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	118,899				131,742				118,899	131,742
Revenue									35,267	43,008	43,093
Net Revenue									35,267	43,008	43,093
Royalty Interest | United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	102,385				110,286				102,385	110,286
Revenue									35,483	42,675	34,671
Net Revenue									35,483	42,675	34,671
Royalty Interest | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	697				12,760				697	12,760
Revenue									1,868	3,075	7,943
Net Revenue									1,868	3,075	7,943
Royalty Interest | Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	42,547				50,119				42,547	50,119
Revenue									10,462	8,494	8,353
Net Revenue									10,462	8,494	8,353
Royalty Interest | Other
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net	$ 32,649				$ 42,720				32,649	42,720
Revenue									7,922	9,659	10,883
Net Revenue									$ 7,922	$ 9,659	$ 10,883