EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income attributable to Royal Gold common stockholders	$ 47,166	$ 63,875
Weighted-average shares for basic EPS (in shares)	65,637,428	65,594,977
Effect of other dilutive securities (in shares)	102,832	114,118
Weighted-average shares for diluted EPS (in shares)	65,740,260	65,709,095
Basic EPS (in dollars per share)	$ 0.72	$ 0.97
Diluted EPS (in dollars per share)	$ 0.72	$ 0.97