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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
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_GainLossonEarlyExtinguishmentorExchangeofDebt 4,531mtga_GainLossonEarlyExtinguishmentorExchangeofDebt 14,326mtga_GainLossonEarlyExtinguishmentorExchangeofDebt
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
(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
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 increase (decrease) in construction payables of $(5,179), $5,948 and $(3,829), respectively (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
Proceeds from Commonwealth of Pennsylvania’s facility improvement grant 0mtga_ProceedsFromCommonwealthOfPennsylvaniaFacilityImprovementGrant 0mtga_ProceedsFromCommonwealthOfPennsylvaniaFacilityImprovementGrant 2,000mtga_ProceedsFromCommonwealthOfPennsylvaniaFacilityImprovementGrant
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:      
Line of Credit borrowings     225,215us-gaap_ProceedsFromLinesOfCredit
Line of Credit repayments     (225,215)us-gaap_RepaymentsOfLinesOfCredit
Borrowings from Mohegan Tribe 0us-gaap_ProceedsFromRelatedPartyDebt 0us-gaap_ProceedsFromRelatedPartyDebt 20,600us-gaap_ProceedsFromRelatedPartyDebt
Repayments to Mohegan Tribe (3,250)us-gaap_RepaymentsOfRelatedPartyDebt (9,950)us-gaap_RepaymentsOfRelatedPartyDebt 0us-gaap_RepaymentsOfRelatedPartyDebt
Proceeds from issuance of Senior Unsecured Notes   500,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt  
Repayments of other long-term debt (212,323)us-gaap_RepaymentsOfOtherDebt (495,601)us-gaap_RepaymentsOfOtherDebt (66,454)us-gaap_RepaymentsOfOtherDebt
Salishan-Mohegan Bank Credit Facility repayments -Revolving 0mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan 0mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan (15,250)mtga_SalishanMoheganBankCreditFacilityRepaymentsRevolvingLoan
Downs Lodging Credit Facility borrowings - Term     45,000mtga_TermLoanCreditFacilityBorrowings
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
Non-controlling interest contributions 0us-gaap_ProceedsFromMinorityShareholders 0us-gaap_ProceedsFromMinorityShareholders 280us-gaap_ProceedsFromMinorityShareholders
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
Supplemental disclosures:      
Cash paid during the year for interest 153,481us-gaap_InterestPaid 180,657us-gaap_InterestPaid 118,225us-gaap_InterestPaid
Repurchase of membership interest 0mtga_RepurchaseofMembershipInterest 7,420mtga_RepurchaseofMembershipInterest 0mtga_RepurchaseofMembershipInterest
Capital lease 0us-gaap_CapitalLeaseObligationsIncurred 0us-gaap_CapitalLeaseObligationsIncurred 4,189us-gaap_CapitalLeaseObligationsIncurred
Credit Facility | Prior Bank Credit Facility - Revolving      
Cash flows provided by (used in) financing activities:      
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
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
Credit Facility | Prior Bank Credit Facility - Term Loan      
Cash flows provided by (used in) financing activities:      
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 Term Loan Facility      
Cash flows provided by (used in) financing activities:      
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
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
Credit Facility | Senior Secured Credit Facility - Revolving      
Cash flows provided by (used in) financing activities:      
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
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
Credit Facility | Senior Secured Credit Facility - Term Loan A      
Cash flows provided by (used in) financing activities:      
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
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
Credit Facility | Senior Secured Credit Facility - Term Loan B      
Cash flows provided by (used in) financing activities:      
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
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
Credit Facility | Bank of America, N.A. Line of Credit      
Cash flows provided by (used in) financing activities:      
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
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
Credit Facility | Downs Lodging Credit Facility      
Cash flows provided by (used in) financing activities:      
Downs Lodging Credit Facility borrowings - Term 0mtga_TermLoanCreditFacilityBorrowings
/ us-gaap_DebtInstrumentAxis
= mtga_DownsLodgingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
0mtga_TermLoanCreditFacilityBorrowings
/ us-gaap_DebtInstrumentAxis
= mtga_DownsLodgingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
45,000mtga_TermLoanCreditFacilityBorrowings
/ us-gaap_DebtInstrumentAxis
= mtga_DownsLodgingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Senior Unsecured Notes      
Cash flows provided by (used in) financing activities:      
Proceeds from issuance of Senior Unsecured Notes $ 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 500,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember