EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
EARNINGS PER SHARE ("EPS")
Net (loss) income available to Royal Gold common stockholders	$ (67,656)	$ 25,014	$ (97,589)	$ 37,148
Weighted-average shares for basic EPS	65,085,225	65,033,547	65,069,056	64,999,331
Effect of other dilutive securities (in shares)		95,815		122,982
Weighted-average shares for diluted EPS	65,085,225	65,129,362	65,069,056	65,122,313
Basic (loss) earnings per share (in dollars per share)	$ (1.04)	$ 0.38	$ (1.50)	$ 0.57
Diluted (loss) earnings per share (in dollars per share)	(1.04)	$ 0.38	(1.50)	$ 0.57
2019 Conversion Notes, Initial conversion price per share of common stock (in dollars per share)	$ 105.31		$ 105.31