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RECEIVABLES, NET (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables $ 42,285mtga_ReceivablesGrossCurrent $ 36,311mtga_ReceivablesGrossCurrent
Allowance for doubtful accounts (11,645)mtga_AllowanceForDoubtfulReceivablesCurrent (10,169)mtga_AllowanceForDoubtfulReceivablesCurrent
Total receivables, net 30,640us-gaap_ReceivablesNetCurrent 26,142us-gaap_ReceivablesNetCurrent
Gaming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables 32,789mtga_ReceivablesGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mtga_GamingReceivableMember		 27,369mtga_ReceivablesGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mtga_GamingReceivableMember
Hotel    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables 922mtga_ReceivablesGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mtga_HotelReceivableMember		 1,731mtga_ReceivablesGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mtga_HotelReceivableMember
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables $ 8,574mtga_ReceivablesGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mtga_OtherReceivablesMember		 $ 7,211mtga_ReceivablesGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mtga_OtherReceivablesMember