EARNINGS PER SHARE ("EPS") (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
EARNINGS PER SHARE ("EPS")
Net income available to Royal Gold common stockholders (in dollars)	$ 15,195	$ 24,771
Weighted-average shares for basic EPS	64,858,354	59,435,867
Effect of other dilutive securities (in shares)	122,245	243,940
Weighted-average shares for diluted EPS	64,980,599	59,679,807
Basic earnings per share (in dollars per share)	$ 0.23	$ 0.42
Diluted earnings per share (in dollars per share)	$ 0.23	$ 0.41
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