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Stockholders' Equity, 3 (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
May 08, 2013
Dec. 29, 2014
Apr. 14, 2014
Oct. 14, 2014
May 20, 2014
Sep. 16, 2014
Dec. 30, 2013
Senior Secured Promissory Notes [Line Items]              
Warrants outstanding (in shares)   550,000us-gaap_ClassOfWarrantOrRightOutstanding          
Fair value of warrants   $ 700,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure          
Black-Scholes model using the following assumptions [Abstract]              
Issuance of stock warrants   500,000cosi_DebtConversionConvertedInstrumentWarrantsOrOptionsIssuedAmount          
Debt issuance costs   446,000us-gaap_DebtIssuanceCosts          
Reverse Common Stock Split [Abstract]              
Reverse split of its common stock one-for-four            
Par value of common stock issued (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare         $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Senior Secured Promissory Note [Member]              
Senior Secured Promissory Notes [Line Items]              
Face amount     5,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Interest rate (in hundredths)     9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Number of initial semi-annual interest payments may be paid in kind     2cosi_NumberOfInitialSemiAnnualInterestPaymentsMayBePaidInKind
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Paid-in-kind interest rate (in hundredths)     11.00%cosi_DebtInstrumentPaidInKindInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Maturity term     3 years        
Finance fee (in hundredths)     3.50%cosi_DebtInstrumentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Shares issuable upon exercise of warrant (in shares)     1,100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Ownership rate that may not be exceeded (in hundredths)     19.90%cosi_BusinessCombinationMaximumOwnershipInterest
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Maximum amount of obligation     4,000,000cosi_ClassOfWarrantOrRightMaximumValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
       
AB Note Purchase Agreement [Member]              
Senior Secured Promissory Notes [Line Items]              
Face amount         2,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Interest rate (in hundredths)         9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Number of initial semi-annual interest payments may be paid in kind         2cosi_NumberOfInitialSemiAnnualInterestPaymentsMayBePaidInKind
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Paid-in-kind interest rate (in hundredths)         11.00%cosi_DebtInstrumentPaidInKindInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Finance fee (in hundredths)         3.50%cosi_DebtInstrumentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Number of warrants issued (in shares)         550,000cosi_NumberOfWarrantsIssuedDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Shares issuable upon exercise of warrant (in shares)       550,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
     
Number of shares forfeited to pay for the warrants in lieu of cash (in shares)       2,895us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
     
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Ownership rate that may not be exceeded (in hundredths)         19.90%cosi_BusinessCombinationMaximumOwnershipInterest
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Black-Scholes model using the following assumptions [Abstract]              
Expected life   3 years          
Volatility (in hundredths)   63.86%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
         
Risk Free interest rate (in hundredths)   0.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
         
Dividend yield (on common stock) (in hundredths)   0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
         
MILFAM II Note Agreement [Member]              
Senior Secured Promissory Notes [Line Items]              
Number of warrants issued (in shares)           1,100,000cosi_NumberOfWarrantsIssuedDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Exercise of warrants to purchase common stock (in shares)           1,100,000cosi_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Aggregate purchase price of warrants           11,000cosi_AggregatePurchasePriceRelatedToExerciseOfWarrants
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Fair value of warrants           1,300,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Black-Scholes model using the following assumptions [Abstract]              
Expected life   3 years          
Volatility (in hundredths)   63.86%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
         
Risk Free interest rate (in hundredths)   0.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
         
Dividend yield (on common stock) (in hundredths)   0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
         
Issuance of stock warrants           $ 1,000,000cosi_DebtConversionConvertedInstrumentWarrantsOrOptionsIssuedAmount
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember