EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
EARNINGS PER SHARE ("EPS")
Net income (loss) available to Royal Gold common stockholders (in dollars)	$ 15,114	$ (6,548)	$ (29,933)	$ 12,134
Weighted-average shares for basic EPS	65,073,678	65,002,307	65,061,059	64,982,595
Effect of other dilutive securities (in shares)	48,066			139,590
Weighted-average shares for diluted EPS	65,121,744	65,002,307	65,061,059	65,122,185
Basic earnings (loss) per share (in dollars per share)	$ 0.23	$ (0.10)	$ (0.46)	$ 0.19
Diluted earnings (loss) per share (in dollars per share)	0.23	$ (0.10)	(0.46)	$ 0.19
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		$ 105.31