EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
EARNINGS PER SHARE ("EPS")
Net income attributable to Royal Gold common stockholders	$ 63,875	$ 65,675
Weighted-average shares for basic EPS	65,594,977	65,565,735
Effect of other dilutive securities	114,118	78,933
Weighted-average shares for diluted EPS	65,709,095	65,644,668
Basic EPS	$ 0.97	$ 1.00
Diluted EPS	$ 0.97	$ 1.00