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Stock-Based Employee Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 29, 2014
Dec. 30, 2013
Dec. 31, 2012
May 02, 2005
Stock-based compensation expense [Line Items]        
Number of shares authorized (in shares)       925,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Increase in number of shares available for issuance under the Plan (in shares) 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized   375,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized  
Number of shares reserved for issuance under the Omnibus Plan (in shares) 1,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant      
Maturity period under the Omnibus Plan 10 years      
Restricted shares issued (in shares) 1,510,765us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 85,512us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 43,103us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Employee [Member]        
Stock-based compensation expense [Line Items]        
Number of shares reserved for issuance under the Omnibus Plan (in shares) 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_TitleOfIndividualAxis
= cosi_EmployeeMember
     
Restricted shares issued (in shares) 1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_TitleOfIndividualAxis
= cosi_EmployeeMember
     
Unregistered shares (in shares) 1,000,000cosi_ShareBasedCompensationArrangementUnregisteredShares
/ us-gaap_TitleOfIndividualAxis
= cosi_EmployeeMember
     
Employee Stock Option [Member]        
Stock-based compensation expense [Line Items]        
Unrecognized compensation expense related to stock options 1.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Minimum [Member]        
Stock-based compensation expense [Line Items]        
Period over which awards vest 4 years      
Maximum [Member]        
Stock-based compensation expense [Line Items]        
Period over which awards vest 5 years