EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to Royal Gold common stockholders	$ 332,023	$ 239,440	$ 238,982
Weighted-average shares for basic EPS (in shares)	65,662,185	65,613,002	65,576,995
Effect of other dilutive securities	114,649	126,108	84,753
Weighted-average shares for diluted EPS (in shares)	65,776,834	65,739,110	65,661,748
Basic EPS (in dollars per share)	$ 5.04	$ 3.64	$ 3.64
Diluted EPS (in dollars per share)	$ 5.04	$ 3.63	$ 3.63