EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income attributable to Royal Gold common stockholders	$ 81,208	$ 63,449	$ 128,372	$ 127,324
Weighted-average shares for basic EPS (in shares)	65,650,801	65,605,391	65,644,115	65,600,213
Effect of other dilutive securities (in shares)	116,737	157,512	109,784	135,815
Weighted-average shares for diluted EPS (in shares)	65,767,538	65,762,903	65,753,899	65,736,028
Basic EPS (in dollars per share)	$ 1.23	$ 0.97	$ 1.95	$ 1.94
Diluted EPS (in dollars per share)	$ 1.23	$ 0.97	$ 1.95	$ 1.93