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SIGNIFICANT ACCOUNTING POLICIES - Redeemable Limited Partner's Capital (Narrative) (Details)
12 Months Ended
Jun. 30, 2018
Common Class B Unit  
Redeemable Noncontrolling Interest [Line Items]  
Common stock conversion ratio 1
Limited Partner  
Redeemable Noncontrolling Interest [Line Items]  
Period of payment of partnership interest upon withdrawal from partnership 5 years