EARNINGS PER SHARE ("EPS") (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
EARNINGS PER SHARE ("EPS")
Net income available to Royal Gold (in dollars)	$ 25,014	$ 20,143	$ 37,148	$ 46,004
Weighted-average shares for basic EPS	65,033,547	64,963,605	64,999,331	64,895,464
Effect of other dilutive securities (in shares)	95,815	119,175	122,982	117,437
Weighted-average shares for diluted EPS	65,129,362	65,082,780	65,122,313	65,012,901
Basic earnings per share (in dollars per share)	$ 0.38	$ 0.31	$ 0.57	$ 0.71
Diluted earnings per share (in dollars per share)	$ 0.38	$ 0.31	$ 0.57	$ 0.71
Exchange ratio for conversion of exchangeable shares of RG Exchangeco into shares of Royal Gold common stock			1
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