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REDEEMABLE LIMITED PARTNERS' CAPITAL - Narrative (Details)
shares in Thousands, $ in Thousands
12 Months Ended
Jun. 30, 2018
USD ($)
notes_receivable
shares
Jun. 30, 2017
USD ($)
notes_receivable
limited_partner
shares
Jun. 30, 2016
USD ($)
notes_receivable
shares
Temporary Equity [Line Items]      
Limited partnership, limited partners ownership percentage 60.00% 63.00%  
Exchange of Class B units for Class A common stock by member owners $ 216,121 $ 157,371 $ 267,681
Limited Partner      
Temporary Equity [Line Items]      
Number of interest bearing notes receivable | notes_receivable 0 0 0
Number of partners withdrawing from partnership | limited_partner   4  
Period of payment of partnership interest upon withdrawal from partnership 5 years    
Exchange of Class B units for Class A common stock by member owners $ 216,121 $ 157,371 $ 267,681
Common Class B Unit      
Temporary Equity [Line Items]      
Exchange agreement conversion ratio 0.1429    
Redeemable Limited Partners' Capital | Limited Partner      
Temporary Equity [Line Items]      
Noncontrolling interest, change in redemption value $ 157,600 (37,200) 776,800
Exchange of Class B units for Class A common stock by member owners 216,121 157,371 267,681
Common Stock | Class A Common Stock      
Temporary Equity [Line Items]      
Exchange of Class B units for Class A common stock by member owners $ 49 $ 48 $ 77
Exchange of Class B common units for Class A common stock by member owners (in shares) | shares 6,531 4,851 7,723