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Subsequent Events (Details) (Hearthstone Associates, LLC [Member], USD $)
0 Months Ended
Mar. 18, 2014
Jun. 01, 2013
Mar. 20, 2009
Jan. 29, 2014
May 09, 2013
Jan. 26, 2015
Jan. 29, 2015
Dec. 29, 2014
Mar. 31, 2015
Subsequent Event [Line Items]                  
Common shares issuable in Hearthstone merger agreement (in shares) 1,790,993us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued                
Promissory Note [Member]
                 
Subsequent Event [Line Items]                  
Principal payment   $ 500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CommercialPaperMember
             
Partner Note [Member]
                 
Subsequent Event [Line Items]                  
Interest rate (in hundredths)     5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_PartnerNoteMember
           
Debt instrument maturity date     Mar. 30, 2016            
Interest on past due principal and interest     12.00%cosi_AccruedInterestRate
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_PartnerNoteMember
           
Term Note [Member]
                 
Subsequent Event [Line Items]                  
Principal payment     3,300,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_TermNoteMember
           
Private Investor Notes [Member]
                 
Subsequent Event [Line Items]                  
Principal payment   1,500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_PrivatePlacementMember
             
Outstanding principal indebtedness       2,000,000cosi_DebtInstrumentAnnualPrincipalPaymentsOutstandingAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_PrivatePlacementMember
         
Debt instrument maturity date   May 31, 2016              
Interest on past due principal and interest   18.00%cosi_AccruedInterestRate
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_PrivatePlacementMember
             
Minimum gross sale proceeds   20,000,000cosi_MinimumGrossSaleProceeds
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_PrivatePlacementMember
             
Gross sale proceeds percentage (in hundredths)   5.00%cosi_GrossProceedsInterestRatePercentage
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_PrivatePlacementMember
             
Private Investor Notes [Member] | LIBOR [Member]
                 
Subsequent Event [Line Items]                  
Debt instrument variable interest rate description   LIBOR plus eight percent (8%) per annum              
Debt instrument variable interest rate   8.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
             
New Restaurant Loans [Member]
                 
Subsequent Event [Line Items]                  
Outstanding principal indebtedness       800,000cosi_DebtInstrumentAnnualPrincipalPaymentsOutstandingAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CommercialLoanMember
         
FFCC Notes [Member]
                 
Subsequent Event [Line Items]                  
Principal payment         5,400,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
Maturity term         60 months        
Interest rate (in hundredths)         5.93%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
Payment of principal and interest         60,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
Balloon payment         3,200,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
Late fee percentage on past due         10.00%cosi_LateFeePercentageOnPastDue
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
Late fee percentage on past due after maturity date         5.00%cosi_LateFeePercentageOnPastDueAfterMaturityDate
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
Prepayment fee percentage on outstanding principal balance         4.00%cosi_PrepaymentFeePercentageBeforeMaturity
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
Prepayment fee percentage after maturity         1.00%cosi_PrepaymentFeePercentageAfterMaturity
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
Cash collateral pledged               5,000,000cosi_CashCollateralDeposit
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
 
Finance fee (in hundredths)         1.00%cosi_DebtInstrumentFeePercentage
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
       
June 30, 2011, Through March 30, 2012 [Member] | Partner Note [Member]                  
Subsequent Event [Line Items]                  
Principal payment     30,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_PartnerNoteMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
           
June 30, 2012 Through December 30, 2015 [Member] | Partner Note [Member]                  
Subsequent Event [Line Items]                  
Principal payment     60,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_PartnerNoteMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
           
Subsequent Event [Member]                  
Subsequent Event [Line Items]                  
Total assets           4,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Property and equipment           3,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Total liabilities           9,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Indebtedness           7,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Outstanding principal indebtedness           10,700,000cosi_DebtInstrumentAnnualPrincipalPaymentsOutstandingAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent Event [Member] | Partner Note [Member]                  
Subsequent Event [Line Items]                  
Outstanding principal indebtedness             3,300,000cosi_DebtInstrumentAnnualPrincipalPaymentsOutstandingAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_PartnerNoteMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent Event [Member] | New Restaurant Loans [Member]                  
Subsequent Event [Line Items]                  
Borrowings                 1,000,000us-gaap_LongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CommercialLoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | FFCC Notes [Member]                  
Subsequent Event [Line Items]                  
Outstanding principal indebtedness             $ 4,800,000cosi_DebtInstrumentAnnualPrincipalPaymentsOutstandingAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_CashAndCashEquivalentsAxis
= cosi_FirstFranchiseCapitalCorporationNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember