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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL STATEMENT INFORMATION - STATEMENTS OF CASH FLOWS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2010
Cash flows provided by (used in) operating activities:        
Net income (loss) $ (24,558)us-gaap_ProfitLoss $ 47,542us-gaap_ProfitLoss $ 61,241us-gaap_ProfitLoss  
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities:        
Depreciation and amortization 80,126us-gaap_DepreciationAndAmortization 80,317us-gaap_DepreciationAndAmortization 85,030us-gaap_DepreciationAndAmortization  
Relinquishment liability reassessment (1,905)mtga_RelinquishmentLiabilityReassessment (249)mtga_RelinquishmentLiabilityReassessment (11,439)mtga_RelinquishmentLiabilityReassessment  
Accretion of discount to the relinquishment liability 2,205mtga_AccretionOfDiscountToRelinquishmentLiability 4,974mtga_AccretionOfDiscountToRelinquishmentLiability 8,248mtga_AccretionOfDiscountToRelinquishmentLiability  
Cash paid for accretion of discount to the relinquishment liability (2,897)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability (5,792)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability (9,028)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability  
Loss on early extinguishment of debt 58,245mtga_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts 4,531mtga_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts    
Payments of tender offer costs and discounts (48,155)mtga_PaymentsOfTenderOfferCosts (3,104)mtga_PaymentsOfTenderOfferCosts 0mtga_PaymentsOfTenderOfferCosts  
Amortization of debt issuance costs and accretion of bond discounts 8,037us-gaap_AmortizationOfFinancingCostsAndDiscounts 12,285us-gaap_AmortizationOfFinancingCostsAndDiscounts 9,987us-gaap_AmortizationOfFinancingCostsAndDiscounts  
Amortization of net deferred gain on settlement of derivative instruments 0us-gaap_AmortizationOfDeferredHedgeGains (76)us-gaap_AmortizationOfDeferredHedgeGains (255)us-gaap_AmortizationOfDeferredHedgeGains  
Provision for losses on receivables 6,146us-gaap_ProvisionForDoubtfulAccounts 3,436us-gaap_ProvisionForDoubtfulAccounts 3,189us-gaap_ProvisionForDoubtfulAccounts  
Impairment of Project Horizon 4,981us-gaap_ImpairmentOfOngoingProject 0us-gaap_ImpairmentOfOngoingProject 0us-gaap_ImpairmentOfOngoingProject 58,100us-gaap_ImpairmentOfOngoingProject
(Gain) loss on disposition of assets (9)us-gaap_GainLossOnDispositionOfAssets 241us-gaap_GainLossOnDispositionOfAssets 353us-gaap_GainLossOnDispositionOfAssets  
(Gain) loss from unconsolidated affiliates 826us-gaap_IncomeLossFromEquityMethodInvestments 1,553us-gaap_IncomeLossFromEquityMethodInvestments 0us-gaap_IncomeLossFromEquityMethodInvestments  
Intercompany transactions 0mtga_PaymentsforProceedsfromIntercompanyOperatingActivities 0mtga_PaymentsforProceedsfromIntercompanyOperatingActivities    
Changes in operating assets and liabilities:        
Increase in receivables (7,159)us-gaap_IncreaseDecreaseInAccountsReceivable (648)us-gaap_IncreaseDecreaseInAccountsReceivable (7,676)us-gaap_IncreaseDecreaseInAccountsReceivable  
(Increase) decrease in inventories (554)us-gaap_IncreaseDecreaseInInventories 448us-gaap_IncreaseDecreaseInInventories (410)us-gaap_IncreaseDecreaseInInventories  
(Increase) decrease in other assets (3,531)us-gaap_IncreaseDecreaseInOtherOperatingAssets 2,759us-gaap_IncreaseDecreaseInOtherOperatingAssets (4,859)us-gaap_IncreaseDecreaseInOtherOperatingAssets  
Increase (decrease) in trade payables 13,419us-gaap_IncreaseDecreaseInAccountsPayableTrade (2,143)us-gaap_IncreaseDecreaseInAccountsPayableTrade (4,778)us-gaap_IncreaseDecreaseInAccountsPayableTrade  
Increase (decrease) in accrued interest (14,637)us-gaap_IncreaseDecreaseInInterestPayableNet (23,066)us-gaap_IncreaseDecreaseInInterestPayableNet 17,782us-gaap_IncreaseDecreaseInInterestPayableNet  
Increase (decrease) in other liabilities 2,436us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (20,057)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 15,286us-gaap_IncreaseDecreaseInOtherOperatingLiabilities  
Net cash flows provided by (used in) operating activities 73,016us-gaap_NetCashProvidedByUsedInOperatingActivities 102,951us-gaap_NetCashProvidedByUsedInOperatingActivities 176,997us-gaap_NetCashProvidedByUsedInOperatingActivities  
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, net of change in construction payables (35,079)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (59,597)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (47,471)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Issuance of third-party loans and advances (1,804)mtga_IssuanceOfThirdPartyLoansAndAdvances (2,033)mtga_IssuanceOfThirdPartyLoansAndAdvances (923)mtga_IssuanceOfThirdPartyLoansAndAdvances  
Payments received on third-party loans 644mtga_PaymentsReceivedOnThirdPartyLoans 139mtga_PaymentsReceivedOnThirdPartyLoans 146mtga_PaymentsReceivedOnThirdPartyLoans  
(Increase) decrease in restricted cash, net 13,679us-gaap_IncreaseDecreaseInRestrictedCash 33,078us-gaap_IncreaseDecreaseInRestrictedCash (45,231)us-gaap_IncreaseDecreaseInRestrictedCash  
Proceeds from asset sales 134us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 216us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 143us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Investments in unconsolidated affiliates (29)us-gaap_PaymentsToAcquireEquityMethodInvestments (4,971)us-gaap_PaymentsToAcquireEquityMethodInvestments 0us-gaap_PaymentsToAcquireEquityMethodInvestments  
Intercompany transactions 0mtga_PaymentsforProceedsfromIntercompanyInvestingActivities 0mtga_PaymentsforProceedsfromIntercompanyInvestingActivities    
Other cash flows provided by (used in) investing activities     1,366us-gaap_PaymentsForProceedsFromOtherInvestingActivities  
Net cash flows provided by (used in) investing activities (22,455)us-gaap_NetCashProvidedByUsedInInvestingActivities (33,168)us-gaap_NetCashProvidedByUsedInInvestingActivities (91,336)us-gaap_NetCashProvidedByUsedInInvestingActivities  
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term     (3,000)mtga_BankCreditFacilityRepaymentsTermLoan  
Line of Credit repayments     (225,215)us-gaap_RepaymentsOfLinesOfCredit  
Line of Credit borrowings     225,215us-gaap_ProceedsFromLinesOfCredit  
Repayments to Mohegan Tribe (3,250)us-gaap_RepaymentsOfRelatedPartyDebt (9,950)us-gaap_RepaymentsOfRelatedPartyDebt 0us-gaap_RepaymentsOfRelatedPartyDebt  
Repayments of other long-term debt (212,323)us-gaap_RepaymentsOfOtherDebt (495,601)us-gaap_RepaymentsOfOtherDebt (66,454)us-gaap_RepaymentsOfOtherDebt  
Principal portion of relinquishment liability payments (46,574)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments (45,350)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments (45,258)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments  
Distributions to Mohegan Tribe (50,000)us-gaap_PaymentsOfDistributionsToAffiliates (50,000)us-gaap_PaymentsOfDistributionsToAffiliates (52,950)us-gaap_PaymentsOfDistributionsToAffiliates  
Payments of financing fees (12,395)us-gaap_PaymentsOfDebtIssuanceCosts (11,957)us-gaap_PaymentsOfDebtIssuanceCosts (51,513)us-gaap_PaymentsOfDebtIssuanceCosts  
Payments on capital lease obligations (2,168)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (3,385)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (706)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations  
Prior Bank Credit Facility borrowings - Revolving     154,000mtga_BankCreditFacilityBorrowingsRevolvingLoan  
Prior Bank Credit Facility repayments - Revolving     (289,000)mtga_BankCreditFacilityRepaymentsRevolvingLoan  
Proceeds from issuance of Senior Unsecured Notes   500,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt    
Prior Term Loan Facility borrowings, net of discount     220,500mtga_TermLoanFacilityBorrowings  
Borrowings from Mohegan Tribe 0us-gaap_ProceedsFromRelatedPartyDebt 0us-gaap_ProceedsFromRelatedPartyDebt 20,600us-gaap_ProceedsFromRelatedPartyDebt  
Repayments of other long-term debt     (66,454)us-gaap_RepaymentsOfLongTermDebt  
Salishan-Mohegan Bank Credit Facility repayments -Revolving 0mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan 0mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan (15,250)mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan  
Downs Lodging Credit Facility borrowings - Term     45,000mtga_TermLoanCreditFacilityBorrowings  
Intercompany transactions 0mtga_PaymentsforProceedsfromIntercompanyFinancingActivities 0mtga_PaymentsforProceedsfromIntercompanyFinancingActivities    
Other cash flows provided by (used in) financing activities     (426)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities  
Net cash flows provided by (used in) financing activities (65,077)us-gaap_NetCashProvidedByUsedInFinancingActivities (120,243)us-gaap_NetCashProvidedByUsedInFinancingActivities (83,751)us-gaap_NetCashProvidedByUsedInFinancingActivities  
Net decrease in cash and cash equivalents (14,516)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (50,460)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 1,910us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease  
Cash and cash equivalents at beginning of year 63,624us-gaap_CashAndCashEquivalentsAtCarryingValue 114,084us-gaap_CashAndCashEquivalentsAtCarryingValue 112,174us-gaap_CashAndCashEquivalentsAtCarryingValue  
Cash and cash equivalents at end of year 49,108us-gaap_CashAndCashEquivalentsAtCarryingValue 63,624us-gaap_CashAndCashEquivalentsAtCarryingValue 114,084us-gaap_CashAndCashEquivalentsAtCarryingValue  
Authority        
Cash flows provided by (used in) operating activities:        
Net income (loss) (24,178)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
50,326us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
63,260us-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 65,406us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
67,097us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
68,666us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Relinquishment liability reassessment (1,905)mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(249)mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,439)mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Accretion of discount to the relinquishment liability 2,205mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,974mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,248mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash paid for accretion of discount to the relinquishment liability (2,897)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5,792)mtga_CashPaidForAccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Loss on early extinguishment of debt 58,245mtga_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,531mtga_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Payments of tender offer costs and discounts (48,155)mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,104)mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Amortization of debt issuance costs and accretion of bond discounts 7,719us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,968us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Amortization of net deferred gain on settlement of derivative instruments   (76)us-gaap_AmortizationOfDeferredHedgeGains
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Provision for losses on receivables 2,368us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
951us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Impairment of Project Horizon 4,981us-gaap_ImpairmentOfOngoingProject
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
(Gain) loss on disposition of assets (12)us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
222us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
(Gain) loss from unconsolidated affiliates (178)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany transactions (9,896)mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(30,508)mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Changes in operating assets and liabilities:        
Increase in receivables (6,622)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
495us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
(Increase) decrease in inventories (411)us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
326us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
(Increase) decrease in other assets 3,236us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,255us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Increase (decrease) in trade payables 9,858us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2,367)us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Increase (decrease) in accrued interest (12,891)us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(23,183)us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Increase (decrease) in other liabilities (4,587)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(21,440)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Net cash flows provided by (used in) operating activities 42,286us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
62,415us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
122,057us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, net of change in construction payables (18,629)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(24,774)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(37,523)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 644mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
139mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
(Increase) decrease in restricted cash, net 53us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Proceeds from asset sales 104us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
208us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investments in unconsolidated affiliates 0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany transactions 27,195mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
24,289mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other cash flows provided by (used in) investing activities     53,718us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash flows provided by (used in) investing activities 9,367us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(138)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
16,195us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term     (3,000)mtga_BankCreditFacilityRepaymentsTermLoan
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Line of Credit repayments     (225,215)us-gaap_RepaymentsOfLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Line of Credit borrowings     225,215us-gaap_ProceedsFromLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Repayments to Mohegan Tribe 0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Repayments of other long-term debt (212,270)us-gaap_RepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(495,561)us-gaap_RepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Principal portion of relinquishment liability payments (46,574)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(45,350)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(45,258)mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Distributions to Mohegan Tribe (50,000)us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(50,000)us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(52,950)us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Payments of financing fees (12,395)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,757)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(50,440)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Payments on capital lease obligations (2,168)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,385)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Prior Bank Credit Facility borrowings - Revolving     154,000mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Prior Bank Credit Facility repayments - Revolving     (289,000)mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Proceeds from issuance of Senior Unsecured Notes   500,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Prior Term Loan Facility borrowings, net of discount     220,500mtga_TermLoanFacilityBorrowings
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Borrowings from Mohegan Tribe     0us-gaap_ProceedsFromRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Repayments of other long-term debt     (66,454)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Salishan-Mohegan Bank Credit Facility repayments -Revolving     0mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Downs Lodging Credit Facility borrowings - Term     0mtga_TermLoanCreditFacilityBorrowings
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Intercompany transactions 0mtga_PaymentsforProceedsfromIntercompanyFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0mtga_PaymentsforProceedsfromIntercompanyFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other cash flows provided by (used in) financing activities     (2,832)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash flows provided by (used in) financing activities (61,774)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(110,053)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(135,434)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net decrease in cash and cash equivalents (10,121)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(47,776)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,818us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash and cash equivalents at beginning of year 44,060us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
91,836us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
89,018us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash and cash equivalents at end of year 33,939us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
44,060us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
91,836us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total Guarantor Subsidiaries        
Cash flows provided by (used in) operating activities:        
Net income (loss) (27,577)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (6,704)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (29,047)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 13,814us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 13,220us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 16,364us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Relinquishment liability reassessment 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 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] 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_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0mtga_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Payments of tender offer costs and discounts 0mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 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]    
Amortization of net deferred gain on settlement of derivative instruments   0us-gaap_AmortizationOfDeferredHedgeGains
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Provision for losses on receivables 390us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 103us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Impairment of Project Horizon 0us-gaap_ImpairmentOfOngoingProject
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]      
(Gain) loss on disposition of assets 3us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 19us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
(Gain) loss from unconsolidated affiliates 0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Intercompany transactions 62,401mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 49,282mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Changes in operating assets and liabilities:        
Increase in receivables (310)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (1,011)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
(Increase) decrease in inventories (143)us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 122us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
(Increase) decrease in other assets (77)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 41us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Increase (decrease) in trade payables 3,568us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 265us-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 (decrease) in other liabilities (573)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (773)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Net cash flows provided by (used in) operating activities 51,496us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 54,564us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 59,240us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, net of change in construction payables (4,250)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (4,481)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (7,175)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 1,583us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (423)us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 313us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Proceeds from asset sales 30us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 8us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Investments in unconsolidated affiliates 0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Intercompany transactions (24,222)mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (22,468)mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Other cash flows provided by (used in) investing activities     3,372us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Net cash flows provided by (used in) investing activities (26,859)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (27,364)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (3,490)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term     0mtga_BankCreditFacilityRepaymentsTermLoan
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Line of Credit repayments     0us-gaap_RepaymentsOfLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Line of Credit borrowings     0us-gaap_ProceedsFromLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Repayments to Mohegan Tribe 0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Repayments of other long-term debt 0us-gaap_RepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_RepaymentsOfOtherDebt
/ 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] 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] 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Payments of financing fees 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Payments on capital lease obligations (45)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 0us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Prior Bank Credit Facility borrowings - Revolving     0mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Prior Bank Credit Facility repayments - Revolving     0mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Proceeds from issuance of Senior Unsecured Notes   0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Prior Term Loan Facility borrowings, net of discount     0mtga_TermLoanFacilityBorrowings
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Borrowings from Mohegan Tribe     0us-gaap_ProceedsFromRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Repayments of other long-term debt     0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Salishan-Mohegan Bank Credit Facility repayments -Revolving     0mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Downs Lodging Credit Facility borrowings - Term     0mtga_TermLoanCreditFacilityBorrowings
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Intercompany transactions (28,480)mtga_PaymentsforProceedsfromIntercompanyFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (30,302)mtga_PaymentsforProceedsfromIntercompanyFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]    
Other cash flows provided by (used in) financing activities     (56,924)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Net cash flows provided by (used in) financing activities (28,525)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (30,302)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (56,924)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Net decrease in cash and cash equivalents (3,888)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (3,102)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] (1,174)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Cash and cash equivalents at beginning of year 18,655us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 21,757us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 22,931us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Cash and cash equivalents at end of year 14,767us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 18,655us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1] 21,757us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
[1]  
Total Non Guarantor Entities        
Cash flows provided by (used in) operating activities:        
Net income (loss) (30,100)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (17,303)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (5,204)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities:        
Depreciation and amortization 906us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Relinquishment liability reassessment 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Accretion of discount to the relinquishment liability 0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_AccretionOfDiscountToRelinquishmentLiability
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
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
[2]    
Loss on early extinguishment of debt 0mtga_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Payments of tender offer costs and discounts 0mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Amortization of debt issuance costs and accretion of bond discounts 318us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 317us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Amortization of net deferred gain on settlement of derivative instruments   0us-gaap_AmortizationOfDeferredHedgeGains
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Provision for losses on receivables 3,388us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 2,382us-gaap_ProvisionForDoubtfulAccounts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Impairment of Project Horizon 0us-gaap_ImpairmentOfOngoingProject
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]      
(Gain) loss on disposition of assets 0us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
(Gain) loss from unconsolidated affiliates 1,004us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 1,564us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Intercompany transactions 4,783mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 2,449mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Changes in operating assets and liabilities:        
Increase in receivables (1,783)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (132)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
(Increase) decrease in inventories 0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
(Increase) decrease in other assets (5,888)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (5,537)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Increase (decrease) in trade payables (7)us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (41)us-gaap_IncreaseDecreaseInAccountsPayableTrade
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Increase (decrease) in accrued interest (1,746)us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 117us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Increase (decrease) in other liabilities 8,359us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 2,156us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Net cash flows provided by (used in) operating activities (20,766)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (14,028)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (4,300)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, net of change in construction payables (12,200)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (30,342)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (2,773)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Issuance of third-party loans and advances (1,804)mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (2,033)mtga_IssuanceOfThirdPartyLoansAndAdvances
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Payments received on third-party loans 0mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_PaymentsReceivedOnThirdPartyLoans
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
(Increase) decrease in restricted cash, net 12,043us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 33,501us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (45,544)us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Proceeds from asset sales 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Investments in unconsolidated affiliates (29)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (4,971)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Intercompany transactions 45mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Other cash flows provided by (used in) investing activities     (902)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Net cash flows provided by (used in) investing activities (1,945)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (3,845)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (49,219)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term     0mtga_BankCreditFacilityRepaymentsTermLoan
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Line of Credit repayments     0us-gaap_RepaymentsOfLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Line of Credit borrowings     0us-gaap_ProceedsFromLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Repayments to Mohegan Tribe (3,250)us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (9,950)us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Repayments of other long-term debt (53)us-gaap_RepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (40)us-gaap_RepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Principal portion of relinquishment liability payments 0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0mtga_PrincipalPortionOfRelinquishmentLiabilityPayments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Distributions to Mohegan Tribe 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Payments of financing fees 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (200)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] (1,073)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Payments on capital lease obligations 0us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 0us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Prior Bank Credit Facility borrowings - Revolving     0mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Prior Bank Credit Facility repayments - Revolving     0mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Proceeds from issuance of Senior Unsecured Notes   0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Prior Term Loan Facility borrowings, net of discount     0mtga_TermLoanFacilityBorrowings
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Borrowings from Mohegan Tribe     20,600us-gaap_ProceedsFromRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Repayments of other long-term debt     0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Salishan-Mohegan Bank Credit Facility repayments -Revolving     (15,250)mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Downs Lodging Credit Facility borrowings - Term     45,000mtga_TermLoanCreditFacilityBorrowings
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Intercompany transactions 25,507mtga_PaymentsforProceedsfromIntercompanyFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 28,481mtga_PaymentsforProceedsfromIntercompanyFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]    
Other cash flows provided by (used in) financing activities     4,508us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Net cash flows provided by (used in) financing activities 22,204us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 18,291us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 53,785us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Net decrease in cash and cash equivalents (507)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 418us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 266us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Cash and cash equivalents at beginning of year 909us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 491us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 225us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Cash and cash equivalents at end of year 402us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 909us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2] 491us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
[2]  
Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) operating activities:        
Net income (loss) 57,297us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
21,223us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
32,232us-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
0us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Relinquishment liability reassessment 0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0mtga_RelinquishmentLiabilityReassessment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
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
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_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0mtga_NoncashGainsLossesOnEarlyExchangeOfDebtAndWriteOffOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Payments of tender offer costs and discounts 0mtga_PaymentsOfTenderOfferCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
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
   
Amortization of net deferred gain on settlement of derivative instruments   0us-gaap_AmortizationOfDeferredHedgeGains
/ 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
     
(Gain) loss on disposition of assets 0us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_GainLossOnDispositionOfAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
(Gain) loss from unconsolidated affiliates 0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany transactions (57,288)mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(21,223)mtga_PaymentsforProceedsfromIntercompanyOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Changes in operating assets and liabilities:        
Increase in receivables 1,556us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
(Increase) decrease in inventories 0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
(Increase) decrease in other assets (802)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-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 (decrease) in other liabilities (763)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Net cash flows provided by (used in) operating activities 0us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash flows provided by (used in) investing activities:        
Purchases of property and equipment, net of change in construction payables 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
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
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
   
Investments in unconsolidated affiliates 0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany transactions (3,018)mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(1,821)mtga_PaymentsforProceedsfromIntercompanyInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Other cash flows provided by (used in) investing activities     (54,822)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Net cash flows provided by (used in) investing activities (3,018)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(1,821)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(54,822)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term     0mtga_BankCreditFacilityRepaymentsTermLoan
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Line of Credit repayments     0us-gaap_RepaymentsOfLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Line of Credit borrowings     0us-gaap_ProceedsFromLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Repayments to Mohegan Tribe 0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Repayments of other long-term debt 0us-gaap_RepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_RepaymentsOfOtherDebt
/ 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
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
0us-gaap_PaymentsOfDistributionsToAffiliates
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Payments of financing fees 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Payments on capital lease obligations 45us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Prior Bank Credit Facility borrowings - Revolving     0mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Prior Bank Credit Facility repayments - Revolving     0mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Proceeds from issuance of Senior Unsecured Notes   0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Prior Term Loan Facility borrowings, net of discount     0mtga_TermLoanFacilityBorrowings
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Borrowings from Mohegan Tribe     0us-gaap_ProceedsFromRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Repayments of other long-term debt     0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Salishan-Mohegan Bank Credit Facility repayments -Revolving     0mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Downs Lodging Credit Facility borrowings - Term     0mtga_TermLoanCreditFacilityBorrowings
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Intercompany transactions 2,973mtga_PaymentsforProceedsfromIntercompanyFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
1,821mtga_PaymentsforProceedsfromIntercompanyFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Other cash flows provided by (used in) financing activities     54,822us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Net cash flows provided by (used in) financing activities 3,018us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
1,821us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
54,822us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Net decrease in cash and cash equivalents 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash and cash equivalents at beginning of year 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash and cash equivalents at end of year 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Credit Facility | Prior Bank Credit Facility - Revolving        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(3,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(289,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
3,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
154,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Prior Bank Credit Facility borrowings - Revolving   3,000mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Prior Bank Credit Facility repayments - Revolving   (3,000)mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Prior Bank Credit Facility - Revolving | Authority        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility borrowings - Revolving   3,000mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Prior Bank Credit Facility repayments - Revolving   (3,000)mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Prior Bank Credit Facility - Revolving | Total Guarantor Subsidiaries        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility borrowings - Revolving   0mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Prior Bank Credit Facility repayments - Revolving   0mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Credit Facility | Prior Bank Credit Facility - Revolving | Total Non Guarantor Entities        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility borrowings - Revolving   0mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]    
Prior Bank Credit Facility repayments - Revolving   0mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]    
Credit Facility | Prior Bank Credit Facility - Revolving | Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility borrowings - Revolving   0mtga_BankCreditFacilityBorrowingsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Prior Bank Credit Facility repayments - Revolving   0mtga_BankCreditFacilityRepaymentsRevolvingLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Prior Bank Credit Facility - Term Loan        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term (393,000)mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(4,000)mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Line of Credit repayments (393,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(4,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(3,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Credit Facility | Prior Bank Credit Facility - Term Loan | Authority        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term (393,000)mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(4,000)mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Prior Bank Credit Facility - Term Loan | Total Guarantor Subsidiaries        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term 0mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1] 0mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]    
Credit Facility | Prior Bank Credit Facility - Term Loan | Total Non Guarantor Entities        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term 0mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2] 0mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]    
Credit Facility | Prior Bank Credit Facility - Term Loan | Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) financing activities:        
Prior Bank Credit Facility repayments - Term 0mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0mtga_BankCreditFacilityRepaymentsTermLoan
/ us-gaap_DebtInstrumentAxis
= mtga_PriorBankCreditFacilityTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Prior Term Loan Facility        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (222,103)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
220,500us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Credit Facility | Prior Term Loan Facility | Authority        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (222,103)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Credit Facility | Prior Term Loan Facility | Total Guarantor Subsidiaries        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]      
Credit Facility | Prior Term Loan Facility | Total Non Guarantor Entities        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]      
Credit Facility | Prior Term Loan Facility | Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_PriorTermLoanFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Credit Facility | Senior Secured Credit Facility - Revolving        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (273,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Line of Credit borrowings 310,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Credit Facility | Senior Secured Credit Facility - Revolving | Authority        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (273,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of Credit borrowings 310,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Credit Facility | Senior Secured Credit Facility - Revolving | Total Guarantor Subsidiaries        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]      
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]      
Credit Facility | Senior Secured Credit Facility - Revolving | Total Non Guarantor Entities        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]      
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]      
Credit Facility | Senior Secured Credit Facility - Revolving | Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityRevolvingMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Credit Facility | Senior Secured Credit Facility - Term Loan A        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (3,125)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Line of Credit borrowings 124,343us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Credit Facility | Senior Secured Credit Facility - Term Loan A | Authority        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (3,125)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of Credit borrowings 124,343us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Credit Facility | Senior Secured Credit Facility - Term Loan A | Total Guarantor Subsidiaries        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]      
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]      
Credit Facility | Senior Secured Credit Facility - Term Loan A | Total Non Guarantor Entities        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]      
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]      
Credit Facility | Senior Secured Credit Facility - Term Loan A | Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanAMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Credit Facility | Senior Secured Credit Facility - Term Loan B        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (5,475)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Line of Credit borrowings 720,952us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Credit Facility | Senior Secured Credit Facility - Term Loan B | Authority        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (5,475)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of Credit borrowings 720,952us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Credit Facility | Senior Secured Credit Facility - Term Loan B | Total Guarantor Subsidiaries        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]      
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[1]      
Credit Facility | Senior Secured Credit Facility - Term Loan B | Total Non Guarantor Entities        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]      
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
[2]      
Credit Facility | Senior Secured Credit Facility - Term Loan B | Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of Credit borrowings 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSecuredCreditFacilityTermLoanBMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Credit Facility | Bank of America, N.A. Line of Credit        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (353,755)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(24,897)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(225,215)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Line of Credit borrowings 356,796us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
24,897us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
225,215us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Credit Facility | Bank of America, N.A. Line of Credit | Authority        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments (353,755)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
(24,897)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Line of Credit borrowings 356,796us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
24,897us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Credit Facility | Bank of America, N.A. Line of Credit | Total Guarantor Subsidiaries        
Cash flows provided by (used in) financing activities:        
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]    
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 | Bank of America, N.A. Line of Credit | Total Non Guarantor Entities        
Cash flows provided by (used in) financing activities:        
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
[2]    
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
[2]    
Credit Facility | Bank of America, N.A. Line of Credit | Consolidating/Eliminating Adjustments        
Cash flows provided by (used in) financing activities:        
Line of Credit repayments 0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Line of Credit borrowings $ 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
$ 0us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
[1] Includes the Pocono Downs Subsidiaries, MBC, Mohegan Golf, Mohegan Ventures-NW, MVW, WTG and MTGA Gaming.
[2] Includes MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.