EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
EARNINGS PER SHARE ("EPS")
Net income attributable to Royal Gold common stockholders	$ 49,337	$ 45,792	$ 176,661	$ 182,609
Weighted-average shares for basic EPS	65,619,406	65,579,834	65,606,681	65,571,737
Effect of other dilutive securities	137,670	80,318	136,433	89,460
Weighted-average shares for diluted EPS	65,757,076	65,660,152	65,743,114	65,661,197
Basic EPS	$ 0.75	$ 0.70	$ 2.69	$ 2.78
Diluted EPS	$ 0.75	$ 0.70	$ 2.68	$ 2.78