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RELATED PARTY TRANSACTIONS (Details) (USD $)
1 Months Ended 12 Months Ended
Jul. 31, 2008
Sep. 30, 2014
employee
Sep. 30, 2013
Sep. 30, 2012
Related Party Transaction [Line Items]        
Distributions to the Tribe   $ 50,000,000us-gaap_PaymentsOfDistributionsToAffiliates $ 50,000,000us-gaap_PaymentsOfDistributionsToAffiliates $ 52,950,000us-gaap_PaymentsOfDistributionsToAffiliates
Due to Mohegan Tribe   2,250,000us-gaap_DueToRelatedPartiesCurrent 6,308,000us-gaap_DueToRelatedPartiesCurrent  
Bidding threshold established by ordinance   200,000mtga_RelatedPartyTransactionBiddingThresholdEstablishedByOrdinance    
Acceptable variance in bid from lowest bid for ordinance to apply   5.00%mtga_RelatedPartyTransactionAcceptableVarianceInBidFromLowestBidForOrdinanceToApply    
Mohegan Tribe        
Related Party Transaction [Line Items]        
Distributions to the Tribe   50,000,000us-gaap_PaymentsOfDistributionsToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
50,000,000us-gaap_PaymentsOfDistributionsToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
53,000,000us-gaap_PaymentsOfDistributionsToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
Incurred interest expense associated with a related party debt   2,300,000us-gaap_InterestExpenseRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
3,000,000us-gaap_InterestExpenseRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
2,500,000us-gaap_InterestExpenseRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
Due to Mohegan Tribe     808,000us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
 
Term of lease   25 years    
Renewable period of additional term   25 years    
Monthly payment amount 75,000mtga_CapitalLeasesMonthlyPaymentAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
     
Number of employees affiliated with related party   125mtga_RelatedPartyTransactionNumberOfEmployeesAffiliatedWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
   
Mohegan Sun        
Related Party Transaction [Line Items]        
Expenses for services provided to related party   27,100,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganSunMember
26,800,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganSunMember
27,000,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganSunMember
Mohegan Tribal Utility Authority        
Related Party Transaction [Line Items]        
Utilities purchased from related party   $ 19,300,000mtga_RelatedPartyTransactionPurchasesfromRelatedPartyUtilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalUtilityAuthorityMember
$ 17,800,000mtga_RelatedPartyTransactionPurchasesfromRelatedPartyUtilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalUtilityAuthorityMember
$ 18,700,000mtga_RelatedPartyTransactionPurchasesfromRelatedPartyUtilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribalUtilityAuthorityMember