EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net income attributable to Royal Gold common stockholders	$ 113,498	$ 47,166
Weighted-average shares for basic EPS (in shares)	65,705,157	65,637,428
Effect of other dilutive securities (in shares)	86,394	102,832
Weighted-average shares for diluted EPS (in shares)	65,791,551	65,740,260
Basic EPS (in dollars per share)	$ 1.72	$ 0.72
Diluted EPS (in dollars per share)	$ 1.72	$ 0.72