EARNINGS PER SHARE ("EPS") (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
EARNINGS PER SHARE ("EPS")
Net income available to Royal Gold common stockholders	$ 24,771	$ 22,495
Weighted-average shares for basic EPS	59,435,867	55,183,719
Effect of other dilutive securities (in shares)	243,940	307,635
Weighted-average shares for diluted EPS	59,679,807	55,491,354
Basic earnings per share (in dollars per share)	$ 0.42	$ 0.41
Diluted earnings per share (in dollars per share)	$ 0.41	$ 0.40
Exchange ratio for conversion of exchangeable shares of RG Exchangeco into shares of Royal Gold common stock	1
2019 Conversion Notes, Initial conversion price per share of common stock (in dollars per share)	$ 105.31