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LONG-TERM DEBT - Senior Secured Credit Facilities (Details) - USD ($)
12 Months Ended
Aug. 28, 2020
Aug. 24, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Apr. 30, 2018
Apr. 30, 2017
Oct. 31, 2016
Debt Instrument [Line Items]                  
Cash and cash equivalents       $ 112,665,000 $ 130,138,000 $ 103,944,000      
Contribution from Mohegan Tribe       10,000,000          
Loss on modification of debt       (2,888,000) 0 0      
Principal payments       $ 10,500,000 13,300,000        
Senior Secured Credit Facilities | Credit Facility                  
Debt Instrument [Line Items]                  
Borrowing capacity                 $ 1,400,000,000
Reduction of interest rate               0.50%  
Commitment fee percentage       0.50%          
Senior Secured Credit Facilities | Credit Facility | Minimum                  
Debt Instrument [Line Items]                  
Commitment fee percentage       0.375%          
Senior Secured Credit Facilities | Credit Facility | Maximum                  
Debt Instrument [Line Items]                  
Commitment fee percentage       0.50%          
Senior Secured Credit Facility - Revolving | Credit Facility                  
Debt Instrument [Line Items]                  
Borrowing capacity                 $ 170,000,000.0
Letters of credit issued       $ 2,200,000          
Remaining borrowing capacity       50,800,000          
Fourth Amendment To Credit Agreement | Mohegan Tribe                  
Debt Instrument [Line Items]                  
Cash investments $ 20,000,000.0 $ 20,000,000.0              
Contribution from Mohegan Tribe 10,000,000.0 10,000,000.0              
Subordinated debt $ 5,000,000.0 $ 5,000,000.0   $ 5,000,000.0          
Subordinated loan, interest in-kind, percentage 10.00% 10.00%   10.00%          
Reimbursement from limited partnership investment $ 5,000,000.0 $ 5,000,000.0              
Fourth Amendment To Credit Agreement | Senior Secured Credit Facilities                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   0.75%              
Interest and debt expense   $ 16,100,000              
Loss on modification of debt   2,800,000              
Debt issuance costs, net   3,000,000.0              
Amortization of debt discount (premium)   $ 10,300,000              
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 A | Credit Facility                  
Debt Instrument [Line Items]                  
Interest rate, credit facility       7.13%          
Senior Secured Credit Facility - Term Loan B                  
Debt Instrument [Line Items]                  
Credit facility payment       $ 8,700,000          
Senior Secured Credit Facility - Term Loan B | Credit Facility                  
Debt Instrument [Line Items]                  
Interest rate, credit facility       7.38%          
Senior Secured Credit Facility, Term Loan A and Term Loan B                  
Debt Instrument [Line Items]                  
Mandatory repayment       $ 0 0 0      
Senior Secured Credit Facility, Term Loan A and Term Loan B | Credit Facility                  
Debt Instrument [Line Items]                  
Mandatory repayment       $ 47,618,000 $ 64,307,000 $ 86,064,000      
2016 Senior Unsecured Notes | Senior Unsecured Notes                  
Debt Instrument [Line Items]                  
Note stated interest rate       7.875%         7.875%
Term Loan A | Credit Facility                  
Debt Instrument [Line Items]                  
Borrowing capacity                 $ 445,000,000.0
Term Loan A | Fourth Amendment To Credit Agreement | Senior Secured Credit Facilities | Adjusted LIBOR Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   6.125%              
Term Loan A | Fourth Amendment To Credit Agreement | Senior Secured Credit Facilities | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   5.125%              
Term Loan A | Fourth Amendment To Credit Agreement | Senior Secured Credit Facilities | LIBOR Floor                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   1.00%              
Term Loan B | Credit Facility                  
Debt Instrument [Line Items]                  
Borrowing capacity                 $ 785,000,000.0
Increase to maximum borrowing capacity             $ 80,000,000.0    
Term Loan B | Fourth Amendment To Credit Agreement | Senior Secured Credit Facilities | Adjusted LIBOR Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   6.375%              
Term Loan B | Fourth Amendment To Credit Agreement | Senior Secured Credit Facilities | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   5.375%              
Revolving Credit Facility | Credit Facility                  
Debt Instrument [Line Items]                  
Credit facility outstanding       $ 197,000,000.0          
Interest rate, credit facility       4.50%          
Revolving Credit Facility | Fourth Amendment To Credit Agreement | Senior Secured Credit Facilities | Minimum                  
Debt Instrument [Line Items]                  
Cash and cash equivalents $ 70,000,000.0