EARNINGS PER SHARE ("EPS") (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
EARNINGS PER SHARE ("EPS")
Net income available to Royal Gold common stockholders (in dollars)	$ 10,667	$ 27,217	$ 25,862	$ 51,987
Weighted-average shares for basic EPS	64,897,757	63,941,686	64,878,056	61,688,776
Effect of other dilutive securities (in shares)	93,014	195,551	104,633	216,773
Weighted-average shares for diluted EPS	64,990,771	64,137,237	64,982,689	61,905,549
Basic earnings per share (in dollars per share)	$ 0.16	$ 0.42	$ 0.40	$ 0.84
Diluted earnings per share (in dollars per share)	$ 0.16	$ 0.42	$ 0.40	$ 0.84
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
2019 Conversion Notes, Initial conversion price per share of common stock (in dollars per share)	$ 105		$ 105