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MOHEGAN VENTURES-NORTHWEST, LLC (COWLITZ PROJECT) (Details) (Cowlitz Project, USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Jun. 30, 2013
lawsuit
Mar. 31, 2013
lawsuit
Sep. 30, 2014
gaming_machine
table_game
gaming_facility
Sep. 30, 2013
Dec. 31, 2006
acre
Salishan-Mohegan
         
Schedule of Long-term Development Projects [Line Items]          
Development fee     3.00%mtga_LongTermDevelopmentProjectDevelopmentFees
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
   
Area of land purchased (in acres)         152us-gaap_AreaOfRealEstateProperty
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
Term of management agreement     7 years    
Management fee     24.00%mtga_LongTermDevelopmentProjectManagementFees
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
   
Number of authorized gaming facilities     2mtga_NumberOfAuthorizedGamingFacilities
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
   
Number of authorized gaming machines, leasing     975mtga_NumberofAuthorizedGamingMachinesLeasing
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
   
Number of authorized gaming machines, operation     3,000mtga_NumberofAuthorizedGamingMachinesOperation
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
   
Number of authorized table games, operation     125mtga_NumberofAuthorizedTableGamesOperation
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
   
Annual Rate     10.00%mtga_LongtermDevelopmentProjectAnnualRate
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
   
Number of claims dismissed   2us-gaap_LossContingencyClaimsDismissedNumber
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
     
New claims filed 2us-gaap_LossContingencyNewClaimsFiledNumber
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
       
Receivables including accrued interest     $ 56.8mtga_LongTermDevelopmentProjectReceivablesIncludingAccruedInterestGross
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
$ 48.0mtga_LongTermDevelopmentProjectReceivablesIncludingAccruedInterestGross
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
 
Allowance for doubtful collection     $ 17.0mtga_LongTermDevelopmentProjectAllowanceForDoubtfulCollection
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
$ 14.4mtga_LongTermDevelopmentProjectAllowanceForDoubtfulCollection
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
 
Salishan-Mohegan | Mohegan Ventures-Northwest
         
Schedule of Long-term Development Projects [Line Items]          
Membership or limited partnership interest percentage     49.15%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganVenturesNorthwestLlcMember
   
Salishan-Mohegan | Salishan Company, LLC
         
Schedule of Long-term Development Projects [Line Items]          
Membership or limited partnership interest percentage     40.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_SalishanCompanyLlcMember
   
Salishan-Mohegan | Mohegan Tribe
         
Schedule of Long-term Development Projects [Line Items]          
Membership or limited partnership interest percentage     10.85%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_MoheganTribeOfIndiansOfConnecticutMember
   
Salishan-Mohegan Two | Salishan-Mohegan
         
Schedule of Long-term Development Projects [Line Items]          
Membership or limited partnership interest percentage     100.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganTwoMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_SalishanMoheganLlcMember
   
Interchange Development Group | Salishan-Mohegan
         
Schedule of Long-term Development Projects [Line Items]          
Membership or limited partnership interest percentage     100.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_InterchangeDevelopmentGroupLLCMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mtga_SalishanMoheganLlcMember