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STREAM AND ROYALTY INTERESTS, NET (Details)
$ in Thousands
12 Months Ended
Oct. 01, 2020
oz
Jun. 30, 2021
USD ($)
oz
$ / oz
$ / lb
Jun. 30, 2020
USD ($)
Stream and royalty interest | $   $ 2,262,158 $ 2,318,913
Wassa      
Stream and royalty interest | $   $ 67,600  
Wassa | Initial Royalty      
Gold interest (as a percent) 10.50%    
Gold delivered (in ounces) 240,000    
Spot price paid (as a percent) 20.00%    
Remaining gold to be delivered (in ounces)   112,000  
Wassa | Subsequent Royalty      
Gold interest (as a percent) 5.50%    
Spot price paid (as a percent) 30.00%    
Prestea and Bogoso      
Gold interest (as a percent) 5.50%    
Spot price paid (as a percent) 30.00%    
Stream and royalty interest | $   $ 0  
Mount Milligan      
Gold interest (as a percent)   35.00%  
Stream and royalty interest | $   $ 490,300  
Copper streaming interest (as a percent)   18.75%  
Mount Milligan | Gold      
Depletion rate | $ / oz   712  
Mount Milligan | Copper      
Depletion rate | $ / lb   1.53  
Rainy River      
Gold delivered (in ounces)   54,000  
Stream and royalty interest | $   $ 134,000  
Silver delivered (in ounces)   699,400  
Rainy River | Gold      
Depletion rate | $ / oz   779  
Rainy River | Silver      
Depletion rate | $ / oz   9.07  
Rainy River | Initial Royalty      
Gold interest (as a percent)   6.50%  
Silver production acquired (as a percent)   60.00%  
Gold delivered (in ounces)   230,000  
Silver delivered (in ounces)   3,100,000  
Rainy River | Subsequent Royalty      
Gold interest (as a percent)   3.25%  
Silver production acquired (as a percent)   30.00%