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Earnings Per Share - Schedule of the Calculation of Weighted Average Common Shares Outstanding for Basic and Diluted Earnings per Share Available to Common Stockholders (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Calculation of undistributed income (loss) for basic and diluted shares:                      
Net income attributable to Potbelly Corporation $ 702us-gaap_NetIncomeLoss $ 1,947us-gaap_NetIncomeLoss $ 2,010us-gaap_NetIncomeLoss $ (301)us-gaap_NetIncomeLoss $ (3,684)us-gaap_NetIncomeLoss $ 2,165us-gaap_NetIncomeLoss $ 2,759us-gaap_NetIncomeLoss $ 18us-gaap_NetIncomeLoss $ 4,358us-gaap_NetIncomeLoss $ 1,258us-gaap_NetIncomeLoss $ 24,046us-gaap_NetIncomeLoss
Less: Dividend paid to common and preferred stockholders                   (49,854)us-gaap_Dividends  
Less: Accretion of redeemable convertible preferred stock to maximum redemption value                   (15,097)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment (10,495)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Undistributed income (loss) for basic and diluted shares                 4,358us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (63,693)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 13,551us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Allocation of undistributed income (losses) to participating securities:                      
Undistributed income (loss)                 4,358us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic (63,693)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic 13,551us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Weighted average common shares outstanding-basic                 29,209,298us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,132,805us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 4,013,414us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Plus: Effect of potential stock options exercise                 949,142us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements   18,052us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Plus: Effect of potential warrant exercise                 116,621us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants   357,356us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Weighted average common shares outstanding-diluted                 30,275,061us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,132,805us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 4,388,822us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income (loss) per share available to common stockholders-basic $ 0.02us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ (0.01)us-gaap_EarningsPerShareBasic $ (1.93)us-gaap_EarningsPerShareBasic $ (12.29)us-gaap_EarningsPerShareBasic $ (1.77)us-gaap_EarningsPerShareBasic $ (1.74)us-gaap_EarningsPerShareBasic $ 0.15us-gaap_EarningsPerShareBasic $ (6.29)us-gaap_EarningsPerShareBasic $ 0.72us-gaap_EarningsPerShareBasic
Income (loss) per share available to common stockholders-diluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.06us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted $ (1.93)us-gaap_EarningsPerShareDiluted $ (12.29)us-gaap_EarningsPerShareDiluted $ (1.77)us-gaap_EarningsPerShareDiluted $ (1.74)us-gaap_EarningsPerShareDiluted $ 0.14us-gaap_EarningsPerShareDiluted $ (6.29)us-gaap_EarningsPerShareDiluted $ 0.66us-gaap_EarningsPerShareDiluted
Common Share Options [Member]                      
Allocation of undistributed income (losses) to participating securities:                      
Potentially dilutive shares that are considered anti-dilutive                 622,879us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 5,029,576us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1,258,537us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Common Stock [Member]                      
Allocation of undistributed income (losses) to participating securities:                      
Undistributed income (loss)                 4,358us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (63,693)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 2,878us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Warrants [Member]                      
Allocation of undistributed income (losses) to participating securities:                      
Potentially dilutive shares that are considered anti-dilutive                   247,704us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		  
Redeemable Convertible Preferred Stock [Member]                      
Allocation of undistributed income (losses) to participating securities:                      
Undistributed income (loss)                     $ 10,673us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember