EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Net income attributable to Royal Gold common stockholders	$ 281,130	$ 113,498
Weighted-average shares for basic EPS (in shares)	84,720,260	65,705,157
Effect of other dilutive securities (in shares)	297,375	86,394
Weighted-average shares for diluted EPS (in shares)	85,017,635	65,791,551
Basic EPS (in dollars per share)	$ 3.31	$ 1.72
Diluted EPS (in dollars per share)	$ 3.30	$ 1.72