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LONG-TERM DEBT - Schedule of Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Aug. 31, 2013
Feb. 28, 2005
Mar. 31, 2012
Sep. 30, 2009
Mar. 31, 2013
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases $ 1,725,969mtga_LongTermDebtIncludingDueToRelatedParties $ 1,730,936mtga_LongTermDebtIncludingDueToRelatedParties          
Less: current portion of long-term debt (24,047)mtga_LongTermDebtIncludingDueToRelatedPartiesCurrent (31,558)mtga_LongTermDebtIncludingDueToRelatedPartiesCurrent          
Long-term debt, net of current portion 1,701,922mtga_LongTermDebtIncludingDueToRelatedPartiesNoncurrent 1,699,378mtga_LongTermDebtIncludingDueToRelatedPartiesNoncurrent          
Credit Facility | Senior Secured Credit Facility - Revolving, due June 2018              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 50,000mtga_LongTermDebtIncludingDueToRelatedParties
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= mtga_BankCreditRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
37,000mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_BankCreditRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
         
Credit Facility | Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $446 and $523, respectively              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 115,960mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
119,789mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanAFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
         
Unamortized discount 446us-gaap_DebtInstrumentUnamortizedDiscount
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= mtga_TermLoanAFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
523us-gaap_DebtInstrumentUnamortizedDiscount
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= mtga_TermLoanAFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
         
Credit Facility | Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $7,306 and $8,337, respectively              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 713,569mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
716,188mtga_LongTermDebtIncludingDueToRelatedParties
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= mtga_TermLoanBFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
         
Unamortized discount 7,306us-gaap_DebtInstrumentUnamortizedDiscount
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= mtga_TermLoanBFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
8,337us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= mtga_TermLoanBFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
         
Credit Facility | Line of Credit              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 413mtga_LongTermDebtIncludingDueToRelatedParties
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= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
3,041mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_BankOfAmericaNALineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
         
Credit Facility | Downs Lodging Credit Facility, due July 2016              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 45,000mtga_LongTermDebtIncludingDueToRelatedParties
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= mtga_DownsLodgingCreditFacilityMember
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45,000mtga_LongTermDebtIncludingDueToRelatedParties
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= mtga_DownsLodgingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
         
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes, due September 2021              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 500,000mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorUnsecuredNotes20139Point75PercentMember
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500,000mtga_LongTermDebtIncludingDueToRelatedParties
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= mtga_SeniorUnsecuredNotes20139Point75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
         
Note stated interest rate 9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= us-gaap_UnsecuredDebtMember
9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= us-gaap_UnsecuredDebtMember
9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorUnsecuredNotes20139Point75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
       
Senior Subordinated Notes | 2005 6 7/8% Senior Subordinated Notes, due February 2015              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 0mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSubordinatedNotes20056Point875PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
9,654mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSubordinatedNotes20056Point875PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
         
Note stated interest rate 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= mtga_SeniorSubordinatedNotes20056Point875PercentMember
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6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
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  6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
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/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
     
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes, due September 2018, net of discount of $3,146 and $3,506, respectively              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 272,044mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_SeniorSubordinatedNotes201211PercentMember
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= us-gaap_SeniorSubordinatedNotesMember
271,684mtga_LongTermDebtIncludingDueToRelatedParties
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= us-gaap_SeniorSubordinatedNotesMember
         
Unamortized discount 3,146us-gaap_DebtInstrumentUnamortizedDiscount
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3,506us-gaap_DebtInstrumentUnamortizedDiscount
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= us-gaap_SeniorSubordinatedNotesMember
         
Note stated interest rate 11.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= mtga_SeniorSubordinatedNotes201211PercentMember
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= us-gaap_SeniorSubordinatedNotesMember
11.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= mtga_SeniorSubordinatedNotes201211PercentMember
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= us-gaap_SeniorSubordinatedNotesMember
    11.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= mtga_SeniorSubordinatedNotes201211PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
   
Promissory Notes | 2009 Mohegan Tribe Promissory Note, due September 2015              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 1,750mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_MoheganTribePromissoryNote2009Member
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= mtga_PromissoryNotesMember
1,750mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_MoheganTribePromissoryNote2009Member
/ us-gaap_LongtermDebtTypeAxis
= mtga_PromissoryNotesMember
         
Note stated interest rate           10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtga_MoheganTribePromissoryNote2009Member
/ us-gaap_LongtermDebtTypeAxis
= mtga_PromissoryNotesMember
 
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note, due March 2017              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 16,500mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_DebtInstrumentAxis
= mtga_MoheganTribeMinorsTrustPromissoryNote2012Member
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16,500mtga_LongTermDebtIncludingDueToRelatedParties
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= mtga_MoheganTribeMinorsTrustPromissoryNote2012Member
/ us-gaap_LongtermDebtTypeAxis
= mtga_PromissoryNotesMember
         
Note stated interest rate         10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtga_MoheganTribeMinorsTrustPromissoryNote2012Member
/ us-gaap_LongtermDebtTypeAxis
= mtga_PromissoryNotesMember
   
Promissory Notes | 2013 Mohegan Tribe Promissory Note, due December 2018              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases 7,420mtga_LongTermDebtIncludingDueToRelatedParties
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7,420mtga_LongTermDebtIncludingDueToRelatedParties
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= mtga_PromissoryNotesMember
         
Note stated interest rate             4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= mtga_MoheganTribePromissoryNote2013Member
/ us-gaap_LongtermDebtTypeAxis
= mtga_PromissoryNotesMember
Other              
Debt Schedule [Abstract]              
Long-term debt, excluding capital leases $ 3,313mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_LongtermDebtTypeAxis
= mtga_OtherDebtMember
$ 2,910mtga_LongTermDebtIncludingDueToRelatedParties
/ us-gaap_LongtermDebtTypeAxis
= mtga_OtherDebtMember