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Organization and Other Matters - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Oct. 08, 2013
Dec. 28, 2014
State
Dec. 29, 2013
Oct. 09, 2013
Dec. 30, 2012
Store
Nature Of Business And Basis Of Presentation [Line Items]          
Number of sandwich works and shops operation states   26us-gaap_NumberOfStatesInWhichEntityOperates      
Net proceeds from IPO     $ 110,343,000us-gaap_ProceedsFromIssuanceInitialPublicOffering    
Cash dividend paid from proceeds from IPO 49,900,000us-gaap_PaymentsOfDividends   49,854,000us-gaap_PaymentsOfDividends    
Public offering proceeds used for repayments of debt 14,000,000us-gaap_RepaymentsOfDebt        
Net Proceeds to repurchase of common stock   10,246,000us-gaap_PaymentsForRepurchaseOfCommonStock      
IPO [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Public offering shares of common stock       8,625,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Share sold by company       8,474,869us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Net proceeds from IPO       $ 108,800,000us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
IPO [Member] | Underwritten Public Offering [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Public offering shares of common stock       1,125,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_ShareholdersEquityClassAxis
= pbpb_UnderwrittenPublicOfferingMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
IPO [Member] | Shareholders' Equity [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Share sold by stock holders through public offering       150,131pbpb_StockSoldBySellingUnitholdersInConnectionWithInitialPublicOffering
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_ShareholdersEquityMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Company Operated Shops [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Number of shops   334us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
296us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
  264us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
Number of closed stores   1pbpb_NumberOfStoresClosed
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
2pbpb_NumberOfStoresClosed
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
  1pbpb_NumberOfStoresClosed
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
Company Operated Shops [Member] | New Shops [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Number of shops   39us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
/ us-gaap_ProductOrServiceAxis
= pbpb_NewShopsMember
34us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
/ us-gaap_ProductOrServiceAxis
= pbpb_NewShopsMember
  31us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
/ us-gaap_ProductOrServiceAxis
= pbpb_NewShopsMember
Franchised Shops [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Number of closed stores   1pbpb_NumberOfStoresClosed
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember
0pbpb_NumberOfStoresClosed
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember
  0pbpb_NumberOfStoresClosed
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember
Franchised Shops [Member] | New Shops [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Number of shops   7us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember
/ us-gaap_ProductOrServiceAxis
= pbpb_NewShopsMember
8us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember
/ us-gaap_ProductOrServiceAxis
= pbpb_NewShopsMember
  7us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember
/ us-gaap_ProductOrServiceAxis
= pbpb_NewShopsMember
Franchised Shops [Member] | Domestic Operations [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Number of shops   17us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember
/ us-gaap_StatementGeographicalAxis
= pbpb_DomesticOperationsMember
     
Franchised Shops [Member] | Middle East [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Number of shops   12us-gaap_NumberOfStores
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_MiddleEastMember