STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Preferred Stock
Number of authorized and unissued shares (in shares)	10,000,000	10,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock Issuances
Number of stock options exercised (in shares)	48,123	17,198	2,500
Proceeds from stock options exercised	$ 2.9	$ 0.5	$ 0.1