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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2010
Oct. 31, 2006
Sep. 30, 2017
Sep. 30, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]        
Goodwill impairment     $ 0 $ 0
Impairment of finite-live intangible assets     0 0
Pennsylvania Facilities | Slot Machine License        
Acquired Indefinite-lived Intangible Assets [Line Items]        
Intangible asset recorded   $ 50,000,000.0 214,000,000  
Pennsylvania Facilities | Table Game Certificate        
Acquired Indefinite-lived Intangible Assets [Line Items]        
Intangible asset recorded $ 16,500,000.0      
Mohegan Sun | Mohegan Sun trademark        
Acquired Indefinite-lived Intangible Assets [Line Items]        
Intangible asset recorded     119,700,000  
Impairment of Mohegan Sun trademark     $ 0 $ 0