EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
EARNINGS PER SHARE ("EPS")
Net income (loss) available to Royal Gold common stockholders	$ 29,787	$ (45,046)
Weighted-average shares for basic EPS	65,116,686	65,048,439
Effect of other dilutive securities (in shares)	164,218
Weighted-average shares for diluted EPS	65,280,904	65,048,439
Basic earnings (loss) per share (in dollars per share)	$ 0.46	$ (0.69)
Diluted earnings (loss) per share (in dollars per share)	0.46	$ (0.69)
2019 Conversion Notes, Initial conversion price per share of common stock (in dollars per share)	$ 103.52