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LONG-TERM DEBT - Senior Secured Credit Facilities (Details) - USD ($)
6 Months Ended
Apr. 19, 2017
Oct. 14, 2016
Mar. 31, 2018
Sep. 30, 2017
Apr. 14, 2017
Debt Instrument [Line Items]          
Accrued interest payable     $ 19,030,000 $ 19,027,000  
Revolving Loans | Prior Senior Secured Credit Facility - Revolving | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.75%    
Credit Facility | Prior Senior Secured Credit Facility - Revolving          
Debt Instrument [Line Items]          
Letters of credit issued     $ 2,300,000    
Line of Credit Facility, Remaining Borrowing Capacity     $ 106,200,000    
Credit Facility | Senior Secured Credit Facilities          
Debt Instrument [Line Items]          
Line of Credit Facility, Interest Rate Decrease         0.50%
Credit Facility | Senior Secured Credit Facility - Term Loan A | Eurodollar Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate     3.75%    
Credit Facility | Senior Secured Credit Facility - Term Loan A | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.75%    
Credit Facility | Senior Secured Credit Facility - Term Loan B | Eurodollar Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate     4.00%    
Credit Facility | Senior Secured Credit Facility - Term Loan B | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate     3.00%    
Credit Facility | Mohegan Expo Credit Facility          
Debt Instrument [Line Items]          
Borrowing capacity $ 25,000,000        
Fee assessed on unused revolving credit 0.50%        
Credit Facility | Mohegan Expo Credit Facility | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate 4.79% 0.70%      
Credit Facility | Credit Facility | Senior Secured Credit Facilities          
Debt Instrument [Line Items]          
Accrued interest payable     $ 763,000 $ 829,000  
Borrowing capacity   $ 1,400,000,000      
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan A          
Debt Instrument [Line Items]          
Borrowing capacity   $ 445,000,000      
Amortization of principal, percentage, year one   15.00%      
Amortization of principal, percentage, year two   15.00%      
Amortization of principal, percentage, year three   10.00%      
Amortization of principal, percentage, annual   7.50%      
Long-term debt before debt discount and debt issuance costs     351,500,000    
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan A | Federal Funds Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.50%      
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan A | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.00%      
Variable rate basis, minimum   0.00%      
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan A | LIBOR | Minimum          
Debt Instrument [Line Items]          
Variable rate, leverage-based margin   1.50%      
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan A | LIBOR | Maximum          
Debt Instrument [Line Items]          
Variable rate, leverage-based margin   3.25%      
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan A | Eurodollar Rate | Minimum          
Debt Instrument [Line Items]          
Variable rate, leverage-based margin   2.50%      
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan A | Eurodollar Rate | Maximum          
Debt Instrument [Line Items]          
Variable rate, leverage-based margin   4.25%      
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan B          
Debt Instrument [Line Items]          
Borrowing capacity   $ 785,000,000      
Amortization of principal, percentage, annual   1.00%      
Long-term debt before debt discount and debt issuance costs     755,300,000    
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan B | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate   4.50%      
Variable rate basis, minimum   1.00%      
Credit Facility | Credit Facility | Senior Secured Credit Facility - Term Loan B | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   3.50%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving          
Debt Instrument [Line Items]          
Borrowing capacity   $ 170,000,000      
Long-term debt     $ 41,000,000    
Fee assessed on unused revolving credit     0.50%    
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | Minimum          
Debt Instrument [Line Items]          
Fee assessed on unused revolving credit   0.375%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | Maximum          
Debt Instrument [Line Items]          
Fee assessed on unused revolving credit   0.50%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | Federal Funds Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.50%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.00%      
Variable rate basis, minimum   0.00%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | LIBOR | Minimum          
Debt Instrument [Line Items]          
Variable rate, leverage-based margin   1.50%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | LIBOR | Maximum          
Debt Instrument [Line Items]          
Variable rate, leverage-based margin   3.25%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | Eurodollar Rate          
Debt Instrument [Line Items]          
Long-term debt     $ 26,000,000    
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | Eurodollar Rate | Minimum          
Debt Instrument [Line Items]          
Variable rate, leverage-based margin   2.50%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | Eurodollar Rate | Maximum          
Debt Instrument [Line Items]          
Variable rate, leverage-based margin   4.25%      
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Revolving | Base Rate          
Debt Instrument [Line Items]          
Long-term debt     $ 15,000,000    
Variable rate on borrowings     4.75%    
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Term Loan A | Eurodollar Rate          
Debt Instrument [Line Items]          
Variable rate on borrowings     1.88%    
Credit Facility | Revolving Loans | Senior Secured Credit Facility - Term Loan B | Eurodollar Rate          
Debt Instrument [Line Items]          
Variable rate on borrowings     1.88%