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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reserves For Doubtful Collection of Long-term Receivables (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]  
Balance, beginning of period $ 24,250us-gaap_LoansAndLeasesReceivableAllowance
Additions: Charges to bad debt expense 3,388us-gaap_ProvisionForLoanAndLeaseLosses
Deductions: Adjustments (9)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Balance, end of period 27,629us-gaap_LoansAndLeasesReceivableAllowance
Affiliates  
Allowance for Loan and Lease Losses [Roll Forward]  
Balance, beginning of period 24,189us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_CounterpartyNameAxis
= us-gaap_AffiliatedEntityMember
Additions: Charges to bad debt expense 2,644us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_CounterpartyNameAxis
= us-gaap_AffiliatedEntityMember
Deductions: Adjustments 0us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
/ us-gaap_CounterpartyNameAxis
= us-gaap_AffiliatedEntityMember
Balance, end of period 26,833us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_CounterpartyNameAxis
= us-gaap_AffiliatedEntityMember
Others  
Allowance for Loan and Lease Losses [Roll Forward]  
Balance, beginning of period 61us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_CounterpartyNameAxis
= mtga_OthersMember
Additions: Charges to bad debt expense 744us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_CounterpartyNameAxis
= mtga_OthersMember
Deductions: Adjustments (9)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
/ us-gaap_CounterpartyNameAxis
= mtga_OthersMember
Balance, end of period $ 796us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_CounterpartyNameAxis
= mtga_OthersMember