STREAM AND ROYALTY INTERESTS, NET (Details) $ in Thousands, shares in Millions	Dec. 20, 2016 USD ($) item shares	Oct. 20, 2016 USD ($) $ / oz	Oct. 19, 2016	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 CAD
Stream and royalty interests
Cost				$ 3,624,495	$ 3,551,575
Accumulated Depletion				(692,408)	(607,370)
Impairments					(96,118)
Net				2,932,087	2,848,087
Phoenix Gold | Restructuring transaction under Canadian regulations
Stream and royalty interests
Net | CAD						CAD 0
Phoenix Gold | Restructuring transaction under Canadian regulations | Rubicon Minerals Corporation
Stream and royalty interests
Number of common shares of Rubicon received | shares	3
Number of NSR royalties received | item	3
Net Smelter Return (“NSR”) (as a percent)	1.00%
Fair value of the Rubicon common shares upon exchange	$ 3,400
Other royalties received upon exchange	$ 0
Production stage stream interests:
Stream and royalty interests
Cost				1,935,696	1,878,045
Accumulated Depletion				(212,132)	(122,064)
Net				1,723,564	1,755,981
Production stage stream interests: | Mount Milligan
Stream and royalty interests
Cost				790,635	783,046
Accumulated Depletion				(104,770)	(74,060)
Net				685,865	708,986
Production stage stream interests: | Pueblo Viejo
Stream and royalty interests
Cost				610,404	610,404
Accumulated Depletion				(57,255)	(21,902)
Net				553,149	588,502
Production stage stream interests: | Andacollo
Stream and royalty interests
Cost				388,182	388,182
Accumulated Depletion				(32,753)	(18,286)
Net				355,429	369,896
Production stage stream interests: | Wassa and Prestea
Stream and royalty interests
Cost				146,475	96,413
Accumulated Depletion				(17,354)	(7,816)
Net				129,121	88,597
Production stage royalty interests
Stream and royalty interests
Cost				844,024	881,873
Accumulated Depletion				(480,276)	(485,153)
Impairments					(18,605)
Net				363,748	378,115
Production stage royalty interests | Voisey's Bay
Stream and royalty interests
Cost				205,724	205,724
Accumulated Depletion				(85,671)	(85,671)
Net				120,053	120,053
Production stage royalty interests | Penasquito
Stream and royalty interests
Cost				99,172	99,172
Accumulated Depletion				(33,542)	(29,898)
Net				65,630	69,274
Production stage royalty interests | Holt
Stream and royalty interests
Cost				34,612	34,612
Accumulated Depletion				(19,228)	(17,124)
Net				15,384	17,488
Production stage royalty interests | Cortez
Stream and royalty interests
Cost				20,873	10,630
Accumulated Depletion				(10,530)	(10,000)
Net				10,343	630
Production stage royalty interests | Other
Stream and royalty interests
Cost				483,643	531,735
Accumulated Depletion				(331,305)	(342,460)
Impairments					(18,605)
Net				152,338	170,670
Total production stage stream and royalty interests
Stream and royalty interests
Cost				2,779,720	2,759,918
Accumulated Depletion				(692,408)	(607,217)
Impairments					(18,605)
Net				2,087,312	2,134,096
Development stage stream interests
Stream and royalty interests
Cost				187,758	188,589
Accumulated Depletion					(153)
Impairments					(75,702)
Net				187,758	112,734
Development stage stream interests | Rainy River
Stream and royalty interests
Cost				175,727	100,706
Net				175,727	100,706
Development stage stream interests | Other
Stream and royalty interests
Cost				12,031	87,883
Accumulated Depletion					(153)
Impairments					(75,702)
Net				12,031	12,028
Development stage royalty interests
Stream and royalty interests
Cost				504,271	447,071
Net				504,271	447,071
Development stage royalty interests | Pascua-Lama
Stream and royalty interests
Cost				380,657	380,657
Net				380,657	380,657
Development stage royalty interests | Cortez
Stream and royalty interests
Cost				59,803
Net				59,803
Development stage royalty interests | Other
Stream and royalty interests
Cost				63,811	66,414
Net				63,811	66,414
Total development stage stream and royalty interests
Stream and royalty interests
Cost				692,029	635,660
Accumulated Depletion					(153)
Impairments					(75,702)
Net				692,029	559,805
Total exploration stage royalty interests
Stream and royalty interests
Cost				152,746	155,997
Impairments					(1,811)
Net				$ 152,746	$ 154,186
Thompson Creek | Mount Milligan streaming agreement | Centerra
Stream and royalty interests
Gold streaming interest		35.00%	52.25%
Copper streaming interest		18.75%
Cash payment for each ounce of gold (in dollars per ounce) | $ / oz		435
Percentage of spot price per metric tonne of copper delivered		15.00%
Maximum period between concentrate shipment and final settlement		5 months
Direct transaction costs associated with the amendment		$ 7,700