SEGMENT INFORMATION (Details)	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
CANADA
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Revenue (as a percent)	50.00%	35.00%	47.00%	30.00%
Royalty and stream interests, net (as a percent)	51.00%		51.00%		53.00%
UNITED STATES
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Revenue (as a percent)	15.00%	16.00%	16.00%	15.00%
Royalty and stream interests, net (as a percent)	5.00%		5.00%		3.00%
MEXICO
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Revenue (as a percent)	15.00%	18.00%	14.00%	19.00%
Royalty and stream interests, net (as a percent)	6.00%		6.00%		7.00%
CHILE
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Revenue (as a percent)	12.00%	19.00%	15.00%	24.00%
Royalty and stream interests, net (as a percent)	31.00%		31.00%		31.00%
AUSTRALIA
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Revenue (as a percent)	3.00%	3.00%	3.00%	4.00%
Royalty and stream interests, net (as a percent)	2.00%		2.00%		3.00%
AFRICA
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Revenue (as a percent)	1.00%	5.00%	1.00%	4.00%
Royalty and stream interests, net (as a percent)	1.00%		1.00%		1.00%
OTHER
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Revenue (as a percent)	4.00%	4.00%	4.00%	4.00%
Royalty and stream interests, net (as a percent)	4.00%		4.00%		2.00%