EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
EARNINGS PER SHARE ("EPS")
Net income attributable to Royal Gold common stockholders	$ 138,339	$ 238,982	$ 274,042	$ 302,532	$ 199,343
Weighted-average shares for basic EPS	65,560,468	65,576,995	65,552,586	65,546,400	65,523,024
Effect of other dilutive securities	64,099	84,753		81,191	120,366
Weighted-average shares for diluted EPS	65,624,567	65,661,748	65,624,007	65,627,591	65,643,390
Basic EPS	$ 2.11	$ 3.64	$ 4.17	$ 4.61	$ 3.04
Diluted EPS	$ 2.10	$ 3.63	$ 4.17	$ 4.60	$ 3.03