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COWLITZ PROJECT (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 01, 2019
Dec. 04, 2018
Jun. 30, 2019
Jun. 30, 2018
Mohegan Tribe        
Schedule of Long-term Development Projects [Line Items]        
Consideration received $ (10,000)   $ 10,000 $ 0
Salishan-Mohegan, LLC | Cowlitz Tribal Gaming Authority        
Schedule of Long-term Development Projects [Line Items]        
Repayments of related party debt   $ 106,600    
Outstanding notes receivable   32,000    
Accrued interest receivable   $ 74,600    
Salishan-Mohegan, LLC        
Schedule of Long-term Development Projects [Line Items]        
Consideration received, percentage of management fees 100.00%