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Document and Entity Information (USD $)
12 Months Ended
Jun. 30, 2012
Jul. 31, 2012
Dec. 30, 2011
Document and Entity Information      
Entity Registrant Name ROYAL GOLD INC    
Entity Central Index Key 0000085535    
Document Type 10-K    
Document Period End Date Jun. 30, 2012    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 3,501,458,581
Entity Common Stock, Shares Outstanding   58,885,405  
Entity Exchangeable, Shares Outstanding   763,826  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY