EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
EARNINGS PER SHARE ("EPS")
Net income attributable to Royal Gold common stockholders	$ 70,176	$ 106,939
Weighted-average shares for basic EPS	65,556,608	65,537,714
Effect of other dilutive securities	71,237	94,975
Weighted-average shares for diluted EPS	65,627,845	65,632,689
Basic EPS	$ 1.07	$ 1.63
Diluted EPS	$ 1.07	$ 1.63