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COWLITZ PROJECT (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended
Mar. 10, 2015
Lease_Option
Jun. 30, 2013
lawsuit
Mar. 31, 2013
lawsuit
Sep. 30, 2014
gaming_facility
table_game
gaming_machine
Mar. 31, 2015
Dec. 31, 2006
acre
Schedule of Long-term Development Projects [Line Items]            
Carrying value of land       1,424,068us-gaap_PropertyPlantAndEquipmentNet $ 1,362,734us-gaap_PropertyPlantAndEquipmentNet  
Cowlitz Project | 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		        
Operating leases, term of contract 25 years          
Operating leases, renewal term 25 years          
Operating Lease, Term, Number of Options to Extend 25 year Lease 2mtga_OperatingLeaseTermNumberofOptionstoExtend25yearLease
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember		          
Land | Cowlitz Project | Salishan-Mohegan            
Schedule of Long-term Development Projects [Line Items]            
Carrying value of land       20,000us-gaap_PropertyPlantAndEquipmentNet
/ mtga_LongTermDevelopmentProjectAxis
= mtga_CowlitzProjectMember
/ us-gaap_OtherOwnershipInterestsByNameAxis
= mtga_SalishanMoheganLlcMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember