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LONG-TERM DEBT - Promissory Notes (Details) - USD ($)
1 Months Ended
Dec. 04, 2015
Mar. 31, 2012
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2013
Sep. 30, 2009
Debt Instrument [Line Items]            
Amount outstanding     $ 1,692,206,000      
Accrued interest     12,055,000 $ 8,659,000    
Promissory Notes | 2009 Mohegan Tribe Promissory Note            
Debt Instrument [Line Items]            
Loan face amount           $ 10,000,000.0
Note stated interest rate           10.00%
Accrued interest       2,500,000    
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note            
Debt Instrument [Line Items]            
Loan face amount   $ 20,000,000.0        
Note stated interest rate   10.00%        
Accrued interest     1,300,000 416,000    
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note | Subsequent Event            
Debt Instrument [Line Items]            
Note stated interest rate 12.50%          
Quarterly amortization of principal $ 1,500,000.0          
Repayments of debt 6,000,000          
Amount outstanding $ 10,000,000          
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note | Commencing September 30, 2015 through March 31, 2016            
Debt Instrument [Line Items]            
Periodic interest payment   $ 800,000        
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note | Commencing December 31, 2012 through March 31, 2014            
Debt Instrument [Line Items]            
Quarterly amortization of principal   500,000        
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note | Commencing July 1, 2014 and September 30, 2015            
Debt Instrument [Line Items]            
Quarterly amortization of principal   500,000        
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note | Commencing December 31, 2015 through September 30, 2016            
Debt Instrument [Line Items]            
Quarterly amortization of principal   1,500,000.0        
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note | Commencing at Maturity            
Debt Instrument [Line Items]            
Quarterly amortization of principal   $ 10,000,000.0        
Promissory Notes | 2013 Mohegan Tribe Promissory Note            
Debt Instrument [Line Items]            
Loan face amount         $ 7,400,000  
Note stated interest rate         4.00%  
Accrued interest     $ 1,000 $ 1,000