EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Earnings Per Share [Abstract]
Net income attributable to Royal Gold common stockholders	$ 236,393	$ 132,349	$ 517,523	$ 245,847
Weighted-average shares for basic EPS (in shares)	84,781,861	65,748,410	84,751,231	65,726,903
Effect of other dilutive securities (in shares)	270,233	72,120	317,534	79,257
Weighted-average shares for diluted EPS (in shares)	85,052,094	65,820,530	85,068,765	65,806,160
Basic EPS (in dollars per share)	$ 2.78	$ 2.01	$ 6.10	$ 3.73
Diluted EPS (in dollars per share)	$ 2.78	$ 2.01	$ 6.07	$ 3.73