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RELATED PARTY TRANSACTIONS AND CERTAIN OTHER TRANSACTIONS (Details) - Aircraft lease agreement - Chief Executive Officer - USD ($)
12 Months Ended
Nov. 13, 2013
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Related Party Transaction [Line Items]        
Rate to lease aircraft $ 5,000      
Sales, general and administrative        
Related Party Transaction [Line Items]        
Aircraft leasing expenses   $ 2,100,000 $ 1,300,000 $ 400,000