Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2015	Jul. 28, 2015	Dec. 31, 2014
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, 2015
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			$ 4,057,901,615
Entity Shares Outstanding		65,187,727
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY