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LONG-TERM DEBT - Promissory Notes (Details) - USD ($)
1 Months Ended
Jan. 15, 2016
Dec. 31, 2015
Nov. 30, 2015
Mar. 31, 2012
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2013
Debt Instrument [Line Items]              
Accrued interest payable         $ 5,661,000 $ 12,055,000  
Aggregate principal amount         1,767,530,000    
2015 Mohegan Tribe Promissory Note | Mohegan Gaming Advisors | Affiliates              
Debt Instrument [Line Items]              
Quarterly amortization of principal $ 8,500,000.0            
Accrued interest payable         147,000    
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   12.50%   10.00%      
Quarterly amortization of principal   $ 1,500,000.0          
Accrued interest payable         3,000 1,300,000  
Repayments of debt   $ 6,000,000          
Aggregate principal amount         8,500,000    
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