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Stock-Based Employee Compensation 4 (Details) ($2.80 - $27.76 [Member], USD $)
12 Months Ended
Dec. 29, 2014
$2.80 - $27.76 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (in dollars per share) $ 2.80us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cosi_ExercisePriceRangeFiveMember
Range of Exercise Prices, maximum (in dollars per share) $ 27.76us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cosi_ExercisePriceRangeFiveMember
Options Outstanding [Abstract]  
Number of Options Outstanding (in shares) 6,463us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cosi_ExercisePriceRangeFiveMember
Remaining Contractual Life 2 years 2 months 12 days
Exercise Price (in dollars per share) $ 3.62us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cosi_ExercisePriceRangeFiveMember
Options Exercisable [Abstract]  
Number of Options Exercisable (in shares) 3,750us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cosi_ExercisePriceRangeFiveMember
Exercise Price (in dollars per share) $ 2.80us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cosi_ExercisePriceRangeFiveMember