Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-13357
Entity Registrant Name	Royal Gold, Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-0835164
Entity Address, Address Line One	1660 Wynkoop Street
Entity Address, Address Line Two	Suite 1000
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80202
City Area Code	303
Local Phone Number	573-1660
Title of 12(b) Security	Common Stock
Trading Symbol	RGLD
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Shares Outstanding		65,591,907
Entity Central Index Key	0000085535
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false