STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2015 USD ($) item $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2013 USD ($)
Preferred Stock
Number of authorized and unissued shares (in shares) | shares	10,000,000	10,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Common Stock Offering
Number of stock options exercised (in shares) | shares	20,488	34,495
Proceeds from stock options exercised | $	$ 800	$ 1,100
Proceeds from common stock issued | $	$ 775	$ 1,120	$ 473,771
Exchange ratio for conversion of exchangeable shares of RG Exchangeco into shares of Royal Gold common stock	1
Stockholders' Rights Plan
Number of preferred stock purchase rights for each share of Company common stock held	1
Minimum percentage of company's outstanding shares of common stock accumulated by acquiring party for rights to become exercisable	15.00%
Fraction of newly issued share of Series A junior participating preferred stock that could be purchased, for each Right	0.001
Value of a share of the Company's common stock allowed to be purchased for each Right, as a multiple of the exercise price of the Right	2.00
Initial exercise price of the Right (in dollars per right) | $ / shares	$ 175