EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
EARNINGS PER SHARE ("EPS")
Net income attributable to Royal Gold common stockholders	$ 63,449	$ 71,140	$ 127,324	$ 136,816
Weighted-average shares for basic EPS	65,605,391	65,569,190	65,600,213	65,567,621
Effect of other dilutive securities	157,512	109,130	135,815	94,032
Weighted-average shares for diluted EPS	65,762,903	65,678,320	65,736,028	65,661,653
Basic EPS	$ 0.97	$ 1.08	$ 1.94	$ 2.08
Diluted EPS	$ 0.97	$ 1.08	$ 1.93	$ 2.08