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LONG-TERM DEBT - Senior Secured Credit Facilities (Details) - USD ($)
5 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Oct. 31, 2016
Debt Instrument [Line Items]                
Principal payments     $ 13,300,000 $ 18,900,000        
Senior Secured Credit Facility - Term Loan A                
Debt Instrument [Line Items]                
Credit facility payment     44,500,000 66,800,000        
Senior Secured Credit Facility - Term Loan A | Forecast                
Debt Instrument [Line Items]                
Credit facility payment   $ 33,400,000            
Senior Secured Credit Facility - Term Loan B                
Debt Instrument [Line Items]                
Credit facility payment       8,700,000        
Senior Secured Credit Facility, Term Loan A and Term Loan B                
Debt Instrument [Line Items]                
Mandatory repayment     $ 0   $ 29,900,000      
Credit Facility | Credit Facility, 8%                
Debt Instrument [Line Items]                
Interest rate, credit facility     7.75%          
Credit Facility | Credit Facility, 5.9%                
Debt Instrument [Line Items]                
Interest rate, credit facility     5.82%          
Credit Facility | Term Loan A                
Debt Instrument [Line Items]                
Borrowing capacity               $ 445,000,000
Credit facility payment $ 1,100,000     2,500,000        
Interest rate, credit facility     5.80%          
Credit Facility | Term Loan B                
Debt Instrument [Line Items]                
Borrowing capacity               785,000,000
Increase to maximum borrowing capacity           $ 80,000,000    
Credit Facility | Senior Secured Credit Facility                
Debt Instrument [Line Items]                
Commitment fee percentage     0.50%          
Credit Facility | Senior Secured Credit Facilities                
Debt Instrument [Line Items]                
Borrowing capacity               1,400,000,000.0
Interest rate decrease             0.50%  
Credit Facility | Senior Secured Credit Facility - Revolving                
Debt Instrument [Line Items]                
Borrowing capacity               $ 170,000,000
Letters of credit issued     $ 2,300,000          
Remaining borrowing capacity     $ 145,700,000          
Credit Facility | Senior Secured Credit Facility - Term Loan A                
Debt Instrument [Line Items]                
Interest rate, credit facility     5.79%          
Credit Facility | Senior Secured Credit Facility - Term Loan B                
Debt Instrument [Line Items]                
Interest rate, credit facility     6.04%          
Credit Facility | Senior Secured Credit Facility, Term Loan A and Term Loan B                
Debt Instrument [Line Items]                
Mandatory repayment     $ 0 $ 0 $ 878,161,000      
Credit Facility | Mohegan Expo Credit Facility                
Debt Instrument [Line Items]                
Borrowing capacity             $ 25,000,000  
Increase to maximum borrowing capacity             $ 8,300,000  
Credit facility outstanding     102,000,000          
Credit Facility | Mohegan Expo Credit Facility | Credit Facility, 8%                
Debt Instrument [Line Items]                
Credit facility outstanding     3,000,000          
Credit Facility | Mohegan Expo Credit Facility | Credit Facility, 5.9%                
Debt Instrument [Line Items]                
Credit facility outstanding     $ 99,000,000          
Minimum | Credit Facility | Senior Secured Credit Facility                
Debt Instrument [Line Items]                
Commitment fee percentage     0.375%          
Maximum | Credit Facility | Senior Secured Credit Facility                
Debt Instrument [Line Items]                
Commitment fee percentage     0.50%