EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
EARNINGS PER SHARE ("EPS")
Net income attributable to Royal Gold common stockholders	$ 65,675	$ 54,026
Weighted-average shares for basic EPS	65,565,735	65,550,400
Effect of other dilutive securities	78,933	71,203
Weighted-average shares for diluted EPS	65,644,668	65,621,603
Basic EPS	$ 1.00	$ 0.82
Diluted EPS	$ 1.00	$ 0.82