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RELATED PARTY TRANSACTIONS (Schedule of Revenue and Expense Transactions) (Details) - OVS [Member] - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Related Party Transaction [Line Items]      
Revenues $ 7.4 $ 7.5 $ 6.6
Operating costs $ 2.7 $ 2.0 $ 2.1