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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL STATEMENT INFORMATION - STATEMENTS OF CASH FLOWS (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2010
Cash flows provided by (used in) operating activities:        
Net income (loss) $ 28,959us-gaap_ProfitLoss $ (57,919)us-gaap_ProfitLoss    
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities:        
Depreciation and amortization 39,617us-gaap_DepreciationAndAmortization 39,997us-gaap_DepreciationAndAmortization    
Relinquishment liability reassessment (243)mtga_RelinquishmentLiabilityReassessment 0mtga_RelinquishmentLiabilityReassessment    
Accretion of discount to the relinquishment liability 227mtga_AccretionOfDiscountToRelinquishmentLiability 1,102mtga_AccretionOfDiscountToRelinquishmentLiability    
Cash paid for accretion of discount to the relinquishment liability (778)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability (1,794)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability    
Loss on early extinguishment of debt 0mtga_GainLossonEarlyExtinguishmentorExchangeofDebt 58,479mtga_GainLossonEarlyExtinguishmentorExchangeofDebt    
Payments of tender offer costs and discounts 0mtga_PaymentsOfTenderOfferCosts (48,155)mtga_PaymentsOfTenderOfferCosts    
Amortization of debt issuance costs and accretion of bond discounts 3,816us-gaap_AmortizationOfFinancingCostsAndDiscounts 4,301us-gaap_AmortizationOfFinancingCostsAndDiscounts    
Provision for losses on receivables 2,076us-gaap_ProvisionForDoubtfulAccounts 1,622us-gaap_ProvisionForDoubtfulAccounts    
Impairment of Project Horizon 2,502us-gaap_ImpairmentOfOngoingProject 0us-gaap_ImpairmentOfOngoingProject 5,000us-gaap_ImpairmentOfOngoingProject 58,100us-gaap_ImpairmentOfOngoingProject
Loss on disposition of assets 819us-gaap_GainLossOnDispositionOfAssets 52us-gaap_GainLossOnDispositionOfAssets    
Loss from unconsolidated affiliates 1,263us-gaap_IncomeLossFromEquityMethodInvestments 854us-gaap_IncomeLossFromEquityMethodInvestments    
Inter-company transactions 0mtga_PaymentsforProceedsfromIntercompanyOperatingActivities 0mtga_PaymentsforProceedsfromIntercompanyOperatingActivities    
Changes in operating assets and liabilities:        
(Increase) decrease in receivables 2,443us-gaap_IncreaseDecreaseInAccountsReceivable (3,863)us-gaap_IncreaseDecreaseInAccountsReceivable    
Increase in inventories (631)us-gaap_IncreaseDecreaseInInventories (1,455)us-gaap_IncreaseDecreaseInInventories    
Increase in other assets (4,782)us-gaap_IncreaseDecreaseInOtherOperatingAssets (5,206)us-gaap_IncreaseDecreaseInOtherOperatingAssets    
Increase (decrease) in trade payables (8,446)us-gaap_IncreaseDecreaseInAccountsPayableTrade 287us-gaap_IncreaseDecreaseInAccountsPayableTrade    
Increase (decrease) in accrued interest 1,217us-gaap_IncreaseDecreaseInInterestPayableNet (13,021)us-gaap_IncreaseDecreaseInInterestPayableNet    
Increase in other liabilities 7,990us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 13,680us-gaap_IncreaseDecreaseInOtherOperatingLiabilities    
Net cash flows provided by (used in) operating activities 76,049us-gaap_NetCashProvidedByUsedInOperatingActivities (11,039)us-gaap_NetCashProvidedByUsedInOperatingActivities    
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, including change in construction payables (7,742)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (22,345)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment    
Issuance of third-party loans and advances (1,135)mtga_IssuanceOfThirdPartyLoansAndAdvances (1,026)mtga_IssuanceOfThirdPartyLoansAndAdvances    
Payments received on third-party loans 77mtga_PaymentsReceivedOnThirdPartyLoans 569mtga_PaymentsReceivedOnThirdPartyLoans    
(Increase) decrease in restricted cash, net (1,710)us-gaap_IncreaseDecreaseInRestrictedCash 12,078us-gaap_IncreaseDecreaseInRestrictedCash    
Proceeds from asset sales 1,558us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 36us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment    
Investments in the New England Black Wolves (500)us-gaap_PaymentsForProceedsFromLimitedPartnership 0us-gaap_PaymentsForProceedsFromLimitedPartnership    
Payment of escrow deposit 0mtga_PaymentsofEscrowDeposits (3,356)mtga_PaymentsofEscrowDeposits    
Investments in unconsolidated affiliates 0us-gaap_PaymentsToAcquireEquityMethodInvestments (29)us-gaap_PaymentsToAcquireEquityMethodInvestments    
Inter-company transactions 0mtga_PaymentsforProceedsfromIntercompanyInvestingActivities 0mtga_PaymentsforProceedsfromIntercompanyInvestingActivities    
Net cash flows used in investing activities (9,452)us-gaap_NetCashProvidedByUsedInInvestingActivities (14,073)us-gaap_NetCashProvidedByUsedInInvestingActivities    
Cash flows provided by (used in) financing activities:        
Repayments to Mohegan Tribe 0us-gaap_RepaymentsOfRelatedPartyDebt (2,750)us-gaap_RepaymentsOfRelatedPartyDebt    
Repayments of other long-term debt (9,826)us-gaap_RepaymentsOfOtherLongTermDebt (191,010)us-gaap_RepaymentsOfOtherLongTermDebt    
Principal portion of relinquishment liability payments (24,400)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments (23,457)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments    
Distributions to Mohegan Tribe (20,000)us-gaap_PaymentsOfDistributionsToAffiliates (20,000)us-gaap_PaymentsOfDistributionsToAffiliates    
Payments of financing fees 0us-gaap_PaymentsOfDebtIssuanceCosts (12,629)us-gaap_PaymentsOfDebtIssuanceCosts    
Payments on capital lease obligations (527)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (1,128)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations    
Inter-company transactions 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities    
Net cash flows provided by (used in) financing activities (51,156)us-gaap_NetCashProvidedByUsedInFinancingActivities 21,369us-gaap_NetCashProvidedByUsedInFinancingActivities    
Net increase (decrease) in cash and cash equivalents 15,441us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,743)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease    
Cash and cash equivalents at beginning of period 49,108us-gaap_CashAndCashEquivalentsAtCarryingValue 63,624us-gaap_CashAndCashEquivalentsAtCarryingValue 63,624us-gaap_CashAndCashEquivalentsAtCarryingValue  
Cash and cash equivalents at end of period 64,549us-gaap_CashAndCashEquivalentsAtCarryingValue 59,881us-gaap_CashAndCashEquivalentsAtCarryingValue 49,108us-gaap_CashAndCashEquivalentsAtCarryingValue  
Credit Facility | Bank Credit Facility - Term        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(393,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Prior Term Loan Facility        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(222,103)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Senior Secured Credit Facility - Revolving, due June 2018        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 212,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
130,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit facility/line of credit repayments (199,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(91,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Senior Secured Credit Facility - Term Loan A        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
124,343us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit facility/line of credit repayments (3,125)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(1,563)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Senior Secured Credit Facility - Term Loan B        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
720,952us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit facility/line of credit repayments (3,650)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(1,825)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Line of Credit        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 221,831us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
156,992us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit facility/line of credit repayments (224,459)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(150,453)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Authority        
Cash flows provided by (used in) operating activities:        
Net income (loss) 29,798us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(57,628)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities:        
Depreciation and amortization 32,243us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
32,694us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Relinquishment liability reassessment (243)mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
Accretion of discount to the relinquishment liability 227mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,102mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Cash paid for accretion of discount to the relinquishment liability (778)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,794)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Loss on early extinguishment of debt   58,479mtga_GainLossonEarlyExtinguishmentorExchangeofDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Payments of tender offer costs and discounts   (48,155)mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Amortization of debt issuance costs and accretion of bond discounts 3,657us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,142us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Provision for losses on receivables 302us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
237us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Impairment of Project Horizon 2,502us-gaap_ImpairmentOfOngoingProject
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
Loss on disposition of assets 817us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
51us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Loss from unconsolidated affiliates 44us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(129)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inter-company transactions (9,757)mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(617)mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Changes in operating assets and liabilities:        
(Increase) decrease in receivables 3,225us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4,274)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Increase in inventories (527)us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,017)us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Increase in other assets (1,166)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,182)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Increase (decrease) in trade payables (5,084)us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(360)us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Increase (decrease) in accrued interest (66)us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,149)us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Increase in other liabilities 11,627us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,826us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Net cash flows provided by (used in) operating activities 66,821us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(20,774)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, including change in construction payables (5,474)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(9,600)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Issuance of third-party loans and advances 0mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Payments received on third-party loans 77mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
569mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
(Increase) decrease in restricted cash, net (23)us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
46us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Proceeds from asset sales 1,558us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
36us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investments in the New England Black Wolves 0us-gaap_PaymentsForProceedsFromLimitedPartnership
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
Payment of escrow deposit   0mtga_PaymentsofEscrowDeposits
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investments in unconsolidated affiliates   0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inter-company transactions 456mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,211mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Net cash flows used in investing activities (3,406)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(7,738)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Cash flows provided by (used in) financing activities:        
Repayments to Mohegan Tribe   0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Repayments of other long-term debt (9,780)us-gaap_RepaymentsOfOtherLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(190,984)us-gaap_RepaymentsOfOtherLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Principal portion of relinquishment liability payments (24,400)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(23,457)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Distributions to Mohegan Tribe (20,000)us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(20,000)us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Payments of financing fees   (12,629)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Payments on capital lease obligations (527)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,128)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inter-company transactions 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Net cash flows provided by (used in) financing activities (51,110)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
24,145us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Net increase (decrease) in cash and cash equivalents 12,305us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4,367)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Cash and cash equivalents at beginning of period 33,939us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
44,060us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
44,060us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash and cash equivalents at end of period 46,244us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
39,693us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Authority | Credit Facility | Bank Credit Facility - Term        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments   (393,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Authority | Credit Facility | Prior Term Loan Facility        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments   (222,103)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Authority | Credit Facility | Senior Secured Credit Facility - Revolving, due June 2018        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 212,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
130,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit facility/line of credit repayments (199,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(91,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Authority | Credit Facility | Senior Secured Credit Facility - Term Loan A        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings   124,343us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit facility/line of credit repayments (3,125)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(1,563)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Authority | Credit Facility | Senior Secured Credit Facility - Term Loan B        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings   720,952us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit facility/line of credit repayments (3,650)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(1,825)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Authority | Credit Facility | Line of Credit        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 221,831us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
156,992us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit facility/line of credit repayments (224,459)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(150,453)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Total Guarantor Subsidiaries        
Cash flows provided by (used in) operating activities:        
Net income (loss) (5,952)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (18,507)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities:        
Depreciation and amortization 6,807us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 6,898us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Relinquishment liability reassessment 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]      
Accretion of discount to the relinquishment liability 0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Cash paid for accretion of discount to the relinquishment liability 0mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Loss on early extinguishment of debt   0mtga_GainLossonEarlyExtinguishmentorExchangeofDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Payments of tender offer costs and discounts   0mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Amortization of debt issuance costs and accretion of bond discounts 0us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Provision for losses on receivables 20us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 119us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Impairment of Project Horizon 0us-gaap_ImpairmentOfOngoingProject
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]      
Loss on disposition of assets 2us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 1us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Loss from unconsolidated affiliates 0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Inter-company transactions 21,841mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
32,389mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Changes in operating assets and liabilities:        
(Increase) decrease in receivables (501)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 626us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Increase in inventories (104)us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (438)us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Increase in other assets (221)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (374)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Increase (decrease) in trade payables (3,385)us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 637us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Increase (decrease) in accrued interest 0us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Increase in other liabilities 1,434us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 366us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Net cash flows provided by (used in) operating activities 19,941us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 21,717us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, including change in construction payables (1,691)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (2,671)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Issuance of third-party loans and advances 0mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Payments received on third-party loans 0mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
(Increase) decrease in restricted cash, net (1,687)us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (11)us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Proceeds from asset sales 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Investments in the New England Black Wolves 0us-gaap_PaymentsForProceedsFromLimitedPartnership
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
     
Payment of escrow deposit   0mtga_PaymentsofEscrowDeposits
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Investments in unconsolidated affiliates   0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Inter-company transactions (10,512)mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (15,416)mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Net cash flows used in investing activities (13,890)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (18,098)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Cash flows provided by (used in) financing activities:        
Repayments to Mohegan Tribe   0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Repayments of other long-term debt 0us-gaap_RepaymentsOfOtherLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_RepaymentsOfOtherLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Principal portion of relinquishment liability payments 0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Distributions to Mohegan Tribe 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Payments of financing fees   0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Payments on capital lease obligations (26)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (24)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Inter-company transactions (4,034)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (3,044)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Net cash flows provided by (used in) financing activities (4,060)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (3,068)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Net increase (decrease) in cash and cash equivalents 1,991us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 551us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Cash and cash equivalents at beginning of period 14,767us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 18,655us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 18,655us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Cash and cash equivalents at end of period 16,758us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 19,206us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Total Guarantor Subsidiaries | Credit Facility | Bank Credit Facility - Term        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments   0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Total Guarantor Subsidiaries | Credit Facility | Prior Term Loan Facility        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments   0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Total Guarantor Subsidiaries | Credit Facility | Senior Secured Credit Facility - Revolving, due June 2018        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1] 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1] 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Total Guarantor Subsidiaries | Credit Facility | Senior Secured Credit Facility - Term Loan A        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings   0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1] 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Total Guarantor Subsidiaries | Credit Facility | Senior Secured Credit Facility - Term Loan B        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings   0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1] 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Total Guarantor Subsidiaries | Credit Facility | Line of Credit        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1] 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1] 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Total Non-Guarantor Subsidiaries and Entities        
Cash flows provided by (used in) operating activities:        
Net income (loss) (10,075)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (15,720)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities:        
Depreciation and amortization 567us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 405us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Relinquishment liability reassessment 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
     
Accretion of discount to the relinquishment liability 0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Cash paid for accretion of discount to the relinquishment liability 0mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Loss on early extinguishment of debt   0mtga_GainLossonEarlyExtinguishmentorExchangeofDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Payments of tender offer costs and discounts   0mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Amortization of debt issuance costs and accretion of bond discounts 159us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 159us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Provision for losses on receivables 1,754us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 1,266us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Impairment of Project Horizon 0us-gaap_ImpairmentOfOngoingProject
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
     
Loss on disposition of assets 0us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Loss from unconsolidated affiliates 1,219us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 983us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Inter-company transactions 3,099mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,160mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Changes in operating assets and liabilities:        
(Increase) decrease in receivables (714)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (563)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Increase in inventories 0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Increase in other assets (3,375)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (3,620)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Increase (decrease) in trade payables 23us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 10us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Increase (decrease) in accrued interest 1,283us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (1,872)us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Increase in other liabilities (4,653)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 4,834us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Net cash flows provided by (used in) operating activities (10,713)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (11,958)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, including change in construction payables (577)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (10,074)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Issuance of third-party loans and advances (1,135)mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (1,026)mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Payments received on third-party loans 0mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
(Increase) decrease in restricted cash, net 0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 12,043us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Proceeds from asset sales 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Investments in the New England Black Wolves (500)us-gaap_PaymentsForProceedsFromLimitedPartnership
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
     
Payment of escrow deposit   (3,356)mtga_PaymentsofEscrowDeposits
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Investments in unconsolidated affiliates   (29)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Inter-company transactions 26mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Net cash flows used in investing activities (2,186)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (2,442)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Cash flows provided by (used in) financing activities:        
Repayments to Mohegan Tribe   (2,750)us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Repayments of other long-term debt (46)us-gaap_RepaymentsOfOtherLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (26)us-gaap_RepaymentsOfOtherLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Principal portion of relinquishment liability payments 0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Distributions to Mohegan Tribe 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Payments of financing fees   0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Payments on capital lease obligations 0us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Inter-company transactions 14,090us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 17,249us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Net cash flows provided by (used in) financing activities 14,044us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 14,473us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Net increase (decrease) in cash and cash equivalents 1,145us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 73us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Cash and cash equivalents at beginning of period 402us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2],[3] 909us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3] 909us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]  
Cash and cash equivalents at end of period 1,547us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 982us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[3]    
Total Non-Guarantor Subsidiaries and Entities | Credit Facility | Bank Credit Facility - Term        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments   0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Total Non-Guarantor Subsidiaries and Entities | Credit Facility | Prior Term Loan Facility        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments   0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Total Non-Guarantor Subsidiaries and Entities | Credit Facility | Senior Secured Credit Facility - Revolving, due June 2018        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2] 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2] 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Total Non-Guarantor Subsidiaries and Entities | Credit Facility | Senior Secured Credit Facility - Term Loan A        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings   0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2] 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Total Non-Guarantor Subsidiaries and Entities | Credit Facility | Senior Secured Credit Facility - Term Loan B        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings   0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2] 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Total Non-Guarantor Subsidiaries and Entities | Credit Facility | Line of Credit        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2] 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2] 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[3]    
Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) operating activities:        
Net income (loss) 15,188us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
33,936us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities:        
Depreciation and amortization 0us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Relinquishment liability reassessment 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
     
Accretion of discount to the relinquishment liability 0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Cash paid for accretion of discount to the relinquishment liability 0mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Loss on early extinguishment of debt   0mtga_GainLossonEarlyExtinguishmentorExchangeofDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Payments of tender offer costs and discounts   0mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Amortization of debt issuance costs and accretion of bond discounts 0us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Provision for losses on receivables 0us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Impairment of Project Horizon 0us-gaap_ImpairmentOfOngoingProject
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
     
Loss on disposition of assets 0us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Loss from unconsolidated affiliates 0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Inter-company transactions (15,183)mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(33,932)mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Changes in operating assets and liabilities:        
(Increase) decrease in receivables 433us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
348us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Increase in inventories 0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Increase in other assets (20)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(30)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Increase (decrease) in trade payables 0us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Increase (decrease) in accrued interest 0us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Increase in other liabilities (418)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(346)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Net cash flows provided by (used in) operating activities 0us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(24)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, including change in construction payables 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Issuance of third-party loans and advances 0mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Payments received on third-party loans 0mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
(Increase) decrease in restricted cash, net 0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Proceeds from asset sales 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Payment of escrow deposit   0mtga_PaymentsofEscrowDeposits
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Investments in unconsolidated affiliates   0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Inter-company transactions 10,030mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
14,205mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Net cash flows used in investing activities 10,030us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
14,205us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Cash flows provided by (used in) financing activities:        
Repayments to Mohegan Tribe   0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Repayments of other long-term debt 0us-gaap_RepaymentsOfOtherLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_RepaymentsOfOtherLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Principal portion of relinquishment liability payments 0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Distributions to Mohegan Tribe 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Payments of financing fees   0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Payments on capital lease obligations 26us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
24us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Inter-company transactions (10,056)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(14,205)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Net cash flows provided by (used in) financing activities (10,030)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(14,181)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
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0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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Cash and cash equivalents at beginning of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
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0us-gaap_CashAndCashEquivalentsAtCarryingValue
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0us-gaap_CashAndCashEquivalentsAtCarryingValue
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Cash and cash equivalents at end of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
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0us-gaap_CashAndCashEquivalentsAtCarryingValue
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Consolidating/Eliminating Adjustments | Credit Facility | Bank Credit Facility - Term        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments   0us-gaap_RepaymentsOfLinesOfCredit
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Consolidating/Eliminating Adjustments | Credit Facility | Prior Term Loan Facility        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit repayments   0us-gaap_RepaymentsOfLinesOfCredit
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Consolidating/Eliminating Adjustments | Credit Facility | Senior Secured Credit Facility - Revolving, due June 2018        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
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Consolidating/Eliminating Adjustments | Credit Facility | Senior Secured Credit Facility - Term Loan A        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings   0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
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Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
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Consolidating/Eliminating Adjustments | Credit Facility | Senior Secured Credit Facility - Term Loan B        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings   0us-gaap_ProceedsFromLinesOfCredit
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Credit facility/line of credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
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Consolidating/Eliminating Adjustments | Credit Facility | Line of Credit        
Cash flows provided by (used in) financing activities:        
Credit facility/line of credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
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Credit facility/line of credit repayments $ 0us-gaap_RepaymentsOfLinesOfCredit
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[1] Includes the Pocono Subsidiaries, MBC, Mohegan Golf, Mohegan Ventures-NW, MVW, WTG and MTGA Gaming.
[2] Includes Mohegan Lacrosse, MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.
[3] Includes MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.