INVESTMENTS (Details) - Summary of Gross Unrealized Losses and Fiar Value of Available-for-Sale Investments - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Available-for-sale securities
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 1,044	$ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(90)	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	95
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, gross unrealized loss	0	(5)
Available-for-sale securities, continuous unrealized loss position, fair value, total	1,044	95
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(90)	(5)
Common Stock - Domestic [Member]
Available-for-sale securities
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	0	0
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	0	0
Common Stock - International [Member]
Available-for-sale securities
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	58	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(76)	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	58	0
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(76)	0
Corporate Debt Securities [Member]
Available-for-sale securities
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	0	0
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	0	0
Fixed Income Securities [Member]
Available-for-sale securities
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	986	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	(14)	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	95
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, gross unrealized loss	0	(5)
Available-for-sale securities, continuous unrealized loss position, fair value, total	986	95
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(14)	(5)
Mutual Funds, Domestic Equity [Member]
Available-for-sale securities
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	0	0
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	0	0
Other Securities [Member]
Available-for-sale securities
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, gross unrealized loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	0	0
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	$ 0	$ 0