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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Related Party Transaction [Line Items]        
Connector purchase price $ 8,500 $ 77,613 $ 136,551 $ 85,499
Rental expense   19,300 10,700 9,500
Subleases        
Related Party Transaction [Line Items]        
Rental expense   8,600 8,800 8,800
Mohegan Tribal Utility Authority        
Related Party Transaction [Line Items]        
Utilities purchased from related party   $ 19,300 19,800 16,800
Mohegan Tribe        
Related Party Transaction [Line Items]        
Term of lease   25 years    
Renewable period of additional term   25 years    
Mohegan Tribal Finance Authority | Subleases        
Related Party Transaction [Line Items]        
Rental expense   $ 8,600 8,800 8,800
Mohegan Sun        
Related Party Transaction [Line Items]        
Expenses for services provided to related party   $ 33,200 $ 35,400 $ 31,400