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ORGANIZATION AND BASIS OF PRESENTATION - Organization (Details)
seat in Thousands, $ in Thousands
6 Months Ended
Jan. 26, 2021
USD ($)
Mar. 31, 2021
USD ($)
a
seat
Mar. 31, 2020
USD ($)
Entity Information [Line Items]      
Number of seats | seat   5  
Proceeds from issuance of senior secured notes   $ 1,175,000 $ 0
New Senior Secured Credit Facility      
Entity Information [Line Items]      
Borrowing capacity $ 262,900    
New Senior Secured Notes      
Entity Information [Line Items]      
Proceeds from issuance of senior secured notes $ 1,200,000    
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