EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Net income attributable to Royal Gold common stockholders	$ 466,281	$ 332,023	$ 239,440
Weighted-average shares for basic EPS (in shares)	69,424,381	65,662,185	65,613,002
Effect of other dilutive securities	136,530	114,649	126,108
Weighted-average shares for diluted EPS (in shares)	69,560,911	65,776,834	65,739,110
Basic EPS (in dollars per share)	$ 6.70	$ 5.04	$ 3.64
Diluted EPS (in dollars per share)	$ 6.69	$ 5.04	$ 3.63