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Stock-Based Compensation Expense (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 30, 2015
Mar. 31, 2014
Feb. 19, 2015
Aug. 26, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total non-cash, stock-based compensation expense, net of forfeitures $ 108,000us-gaap_AllocatedShareBasedCompensationExpense $ 168,000us-gaap_AllocatedShareBasedCompensationExpense    
Restricted shares granted (in shares) 0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross      
Closing Price $2.00 [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Vesting percentage on each specified closing price (in hundredths) 25.00%cosi_VestingPercentageOnEachSpecifiedClosingPrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceOneMember
  25.00%cosi_VestingPercentageOnEachSpecifiedClosingPrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceOneMember
 
Vesting percentage on grant date (in hundredths)     50.00%cosi_VestingRightsPercentageOnGrantDate
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceOneMember
 
Closing price (in dollars per share) $ 2.00us-gaap_SharePrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceOneMember
  $ 2.00us-gaap_SharePrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceOneMember
 
Consecutive trading days 30 days      
Closing Price $2.50 [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Vesting percentage on each specified closing price (in hundredths) 25.00%cosi_VestingPercentageOnEachSpecifiedClosingPrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceTwoMember
     
Closing price (in dollars per share) $ 2.50us-gaap_SharePrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceTwoMember
     
Consecutive trading days 30 days      
Closing Price $3.00 [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Vesting percentage on each specified closing price (in hundredths) 25.00%cosi_VestingPercentageOnEachSpecifiedClosingPrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceThreeMember
     
Closing price (in dollars per share) $ 3.00us-gaap_SharePrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceThreeMember
     
Consecutive trading days 30 days      
Closing Price $4.00 [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Vesting percentage on each specified closing price (in hundredths) 25.00%cosi_VestingPercentageOnEachSpecifiedClosingPrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceFourMember
     
Closing price (in dollars per share) $ 4.00us-gaap_SharePrice
/ cosi_ClosingPriceAxis
= cosi_ClosingPriceFourMember
     
Consecutive trading days 30 days      
Key employees [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Restricted shares granted (in shares) 829,164us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_TitleOfIndividualAxis
= cosi_KeyEmployeesMember
     
Additional vesting percentage on each anniversary of the grant date (in hundredths) 25.00%cosi_AdditionalVestingRightsPercentageOnEachAnniversaryOfGrantDate
/ us-gaap_TitleOfIndividualAxis
= cosi_KeyEmployeesMember
     
Vesting percentage on grant date (in hundredths) 50.00%cosi_VestingRightsPercentageOnGrantDate
/ us-gaap_TitleOfIndividualAxis
= cosi_KeyEmployeesMember
     
Restricted shares [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Unrecognized compensation expense related to stock options 900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Value of the shares for the grants made during period 1,000,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Previously issued stock forfeited (in shares) 100,050us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
    75,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Value of the forfeited shares 100,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationForfeited
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Restricted shares [Member] | Key employees [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Restricted shares granted (in shares)   1,029,164us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= cosi_KeyEmployeesMember
   
Additional vesting percentage on each anniversary of the grant date (in hundredths) 50.00%cosi_AdditionalVestingRightsPercentageOnEachAnniversaryOfGrantDate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= cosi_KeyEmployeesMember
     
Number of installments in which restricted common stock vest 4cosi_NumberOfInstallmentsInWhichRestrictedCommonStockVest
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= cosi_KeyEmployeesMember
     
Restricted shares granted with specified vesting schedule (in shares) 200,000cosi_RestrictedSharesGrantedWithSpecifiedVestingSchedule
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= cosi_KeyEmployeesMember
     
Vesting percentage on grant date (in hundredths) 50.00%cosi_VestingRightsPercentageOnGrantDate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= cosi_KeyEmployeesMember
     
Restricted shares [Member] | Members of the Board of Directors [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Number of shares for the grants made during period (in shares) 5,729us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
     
Stock Options [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total non-cash, stock-based compensation expense, net of forfeitures 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Unrecognized compensation expense related to stock options 900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Restricted Stock and Restricted Stock Units [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total non-cash, stock-based compensation expense, net of forfeitures $ 108,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= cosi_RestrictedStockAndRestrictedStockUnitAwardsMember
$ 168,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= cosi_RestrictedStockAndRestrictedStockUnitAwardsMember