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RELATED PARTY TRANSACTIONS (Details) (USD $)
6 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 05, 2015
rooms
acre
Sep. 30, 2014
Related Party Transaction [Line Items]            
Distributions to Mohegan Tribe $ 20,000,000us-gaap_PaymentsOfDistributionsToAffiliates $ 20,000,000us-gaap_PaymentsOfDistributionsToAffiliates        
Minimum Future Rental Expense            
Minimum future rental expense - Remainder of 2015           0us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear
Minimum future rental expense - 2016           0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Minimum future rental expense - 2017           6,327,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Minimum future rental expense - 2018           6,908,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Minimum future rental expense - 2019           7,011,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Minimum future rental expense - Thereafter           224,682,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total minimum future rental expense           244,928,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Mohegan Tribe of Indians of Connecticut            
Related Party Transaction [Line Items]            
Distributions to Mohegan Tribe 20,000,000us-gaap_PaymentsOfDistributionsToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
20,000,000us-gaap_PaymentsOfDistributionsToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
10,000,000us-gaap_PaymentsOfDistributionsToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
10,000,000us-gaap_PaymentsOfDistributionsToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
   
Expenses for services provided to related party 14,200,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
14,300,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
7,100,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
7,300,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
   
Incurred interest expense associated with a related party debt 1,100,000us-gaap_InterestExpenseRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
1,200,000us-gaap_InterestExpenseRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
523,000us-gaap_InterestExpenseRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
569,000us-gaap_InterestExpenseRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
   
Mohegan Tribal Utility Authority            
Related Party Transaction [Line Items]            
Utilities purchased from related party $ 9,400,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalUtilityAuthorityMember
$ 10,800,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalUtilityAuthorityMember
$ 5,100,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalUtilityAuthorityMember
$ 6,300,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalUtilityAuthorityMember
   
Mohegan Tribal Finance Authority            
Related Party Transaction [Line Items]            
Fourth Amendment, Amount of acres released for use         1.2mtga_LessorLeasingArrangementsOperatingLeasesAdditionalLand
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalFinanceAuthorityMember
 
Fourth Amendment, Amount of rooms to be developed         400mtga_LesseeLeasingArrangementsOperatingLeasesRenewalAdditionalHotelRooms
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalFinanceAuthorityMember
 
Duration of the term of the Fourth Amendment         28 years 4 months