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PROPERTY AND EQUIPMENT, NET (Details) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2010
Property, Plant and Equipment, Net, by Type [Abstract]        
Property and equipment, gross $ 2,453,034,000us-gaap_PropertyPlantAndEquipmentGross $ 2,451,545,000us-gaap_PropertyPlantAndEquipmentGross    
Accumulated depreciation (1,028,966,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (975,370,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment    
Total property and equipment, net 1,424,068,000us-gaap_PropertyPlantAndEquipmentNet 1,476,175,000us-gaap_PropertyPlantAndEquipmentNet    
Depreciation expense 79,600,000us-gaap_Depreciation 79,800,000us-gaap_Depreciation 84,500,000us-gaap_Depreciation  
Capitalized interest 735,000us-gaap_InterestCostsCapitalized 2,000,000us-gaap_InterestCostsCapitalized 34,000us-gaap_InterestCostsCapitalized  
Impairment of Project Horizon 4,981,000us-gaap_ImpairmentOfOngoingProject 0us-gaap_ImpairmentOfOngoingProject 0us-gaap_ImpairmentOfOngoingProject 58,100,000us-gaap_ImpairmentOfOngoingProject
Assets anticipated to be utilized under the modified project 4,400,000mtga_AssetsToBeIncludedInOngoingModifiedProject 9,400,000mtga_AssetsToBeIncludedInOngoingModifiedProject    
Land        
Property, Plant and Equipment, Net, by Type [Abstract]        
Property and equipment, gross 65,485,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
65,485,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
   
Land improvements        
Property, Plant and Equipment, Net, by Type [Abstract]        
Property and equipment, gross 97,146,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandImprovementsMember
96,735,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandImprovementsMember
   
Buildings and improvements        
Property, Plant and Equipment, Net, by Type [Abstract]        
Property and equipment, gross 1,734,673,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
1,691,924,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
   
Furniture and equipment        
Property, Plant and Equipment, Net, by Type [Abstract]        
Property and equipment, gross 547,719,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mtga_FurnitureAndEquipmentMember
541,832,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mtga_FurnitureAndEquipmentMember
   
Construction in process        
Property, Plant and Equipment, Net, by Type [Abstract]        
Property and equipment, gross 8,011,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
55,569,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
   
Conceptual Design Work        
Property, Plant and Equipment, Net, by Type [Abstract]        
Impairment of Project Horizon       $ 2,000,000us-gaap_ImpairmentOfOngoingProject
/ us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis
= mtga_ConceptualDesignWorkMember