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LONG-TERM DEBT - Promissory Notes (Details) - USD ($)
1 Months Ended 9 Months Ended
Jan. 15, 2016
Dec. 31, 2015
Nov. 30, 2015
Mar. 31, 2012
Dec. 31, 2016
Jun. 30, 2016
Sep. 30, 2015
Mar. 31, 2013
Debt Instrument [Line Items]                
Accrued interest payable           $ 22,521,000 $ 12,055,000  
Aggregate principal amount           $ 1,722,609,000    
2015 Mohegan Tribe Promissory Note | Mohegan Gaming Advisors | Affiliates                
Debt Instrument [Line Items]                
Quarterly amortization of principal $ 8,500,000.0              
Notes Payable, Related Parties, Current     $ 22,500,000.0          
Financing rate (as a percent)     5.00%          
2012 Mohegan Tribe Promissory Note | Promissory Notes                
Debt Instrument [Line Items]                
Loan face amount       $ 20,000,000.0        
Note stated interest rate       10.00%   12.50%    
Quarterly amortization of principal         $ 1,500,000.0      
Accrued interest payable           $ 2,000 1,300,000  
Repayments of debt   $ 6,000,000            
Aggregate principal amount           7,000,000    
2012 Mohegan Tribe Promissory Note | Promissory Notes | Commencing September 30, 2015 through March 31, 2016                
Debt Instrument [Line Items]                
Periodic payment, interest       $ 800,000        
2012 Mohegan Tribe Promissory Note | Promissory Notes | Commencing December 31, 2012 through March 31, 2014                
Debt Instrument [Line Items]                
Quarterly amortization of principal       500,000        
2012 Mohegan Tribe Promissory Note | Promissory Notes | On July 1, 2014 and September 30, 2015                
Debt Instrument [Line Items]                
Quarterly amortization of principal       500,000        
2012 Mohegan Tribe Promissory Note | Promissory Notes | Commencing December 31, 2015 through September 30, 2016                
Debt Instrument [Line Items]                
Quarterly amortization of principal       1,500,000.0        
2012 Mohegan Tribe Promissory Note | Promissory Notes | At maturity                
Debt Instrument [Line Items]                
Quarterly amortization of principal       $ 10,000,000        
2013 Mohegan Tribe Promissory Note | Promissory Notes                
Debt Instrument [Line Items]                
Loan face amount               $ 7,400,000.0
Note stated interest rate               4.00%
Accrued interest payable           $ 1,000 $ 1,000