EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
EARNINGS PER SHARE ("EPS")
Net (loss) income available to Royal Gold common stockholder(in dollars)	$ (45,046)	$ 18,680
Weighted-average shares for basic EPS	65,048,439	64,962,883
Effect of other dilutive securities (in shares)		144,598
Weighted-average shares for diluted EPS	65,048,439	65,107,481
Basic (loss) earnings per share (in dollars per share)	$ (0.69)	$ 0.29
Diluted (loss) earnings per share (in dollars per share)	(0.69)	$ 0.29
Impact on diluted earnings per share (in dollars per share)	0.00
2019 Conversion Notes, Initial conversion price per share of common stock (in dollars per share)	$ 105.31