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