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ORGANIZATION AND BASIS OF PRESENTATION - Organization (Details)
3 Months Ended
Jan. 26, 2021
USD ($)
Dec. 31, 2020
a
segment
Entity Information [Line Items]    
Number of Seats | segment   5,000
New Senior Secured Credit Facility | Subsequent Event    
Entity Information [Line Items]    
Borrowing capacity | $ $ 262,875,000  
New Senior Secured Notes | Subsequent Event    
Entity Information [Line Items]    
Aggregate principal issued | $ $ 1,175,000,000  
MGE Niagara    
Entity Information [Line Items]    
Ownership percentage   10.00%
Mohegan Sun    
Entity Information [Line Items]    
Size of gaming and entertainment complex (in acres) | a   196
Mohegan Sun Pocono    
Entity Information [Line Items]    
Size of gaming and entertainment complex (in acres) | a   400