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Subsequent Events (Details) (USD $)
0 Months Ended
Apr. 10, 2015
Apr. 01, 2015
Mar. 30, 2015
Dec. 29, 2014
May 20, 2014
Subsequent Event [Line Items]          
Company common stock, par value (in dollars per share)     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare  
AB Notes [Member]          
Subsequent Event [Line Items]          
Warrants exercise price (in dollars per share)         $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
Subsequent Event [Member] | Private Placement [Member]          
Subsequent Event [Line Items]          
Company common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
       
Number of shares purchased (in shares) 7,160,766us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
       
Purchase price (in dollars per share) $ 2.16us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
       
Gross sale proceeds $ 15,500,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
       
Subsequent Event [Member] | Hearthstone Associates, LLC [Member]          
Subsequent Event [Line Items]          
Cash collateral pledged   5,000,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Debt instrument, remaining amount   4,700,000cosi_DebtInstrumentRemainingAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Liabilities retained   703,718cosi_AmountOfLiabilitiesRetained
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Amount held in escrow   $ 500,000us-gaap_EscrowDeposit
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Common shares issuable in Hearthstone merger agreement (in shares)   1,790,993us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Company common stock, par value (in dollars per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent Event [Member] | Hearthstone Associates, LLC [Member] | R. J. Dourney [Member]          
Subsequent Event [Line Items]          
Common shares issuable in Hearthstone merger agreement (in shares)   1,701,050us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
     
Subsequent Event [Member] | Hearthstone Associates, LLC [Member] | Nancy Dourney [Member]          
Subsequent Event [Line Items]          
Common shares issuable in Hearthstone merger agreement (in shares)   17,182us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= cosi_SpouseOfChiefExecutiveOfficerMember
     
Subsequent Event [Member] | Hearthstone Associates, LLC [Member] | Richard Bagge [Member]          
Subsequent Event [Line Items]          
Common shares issuable in Hearthstone merger agreement (in shares)   72,761us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember