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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 |  | 26 us-gaap_NumberOfStatesInWhichEntityOperates |  |  |
Net proceeds from IPO |  |  | $ 110,343,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering |  |
Cash dividend paid from proceeds from IPO | 49,900,000 us-gaap_PaymentsOfDividends |  | 49,854,000 us-gaap_PaymentsOfDividends |  |
Public offering proceeds used for repayments of debt | 14,000,000 us-gaap_RepaymentsOfDebt |  |  |  |
Net Proceeds to repurchase of common stock |  | 10,246,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |
IPO [Member] |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |
Public offering shares of common stock |  |  |  | 8,625,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Share sold by company |  |  |  | 8,474,869 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Net proceeds from IPO |  |  |  | $ 108,800,000 us-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 |  |  |  | 1,125,000 us-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 |  |  |  | 150,131 pbpb_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 |  | 334 us-gaap_NumberOfStores / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember | 296 us-gaap_NumberOfStores / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember |  | 264 us-gaap_NumberOfStores / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember
Number of closed stores |  | 1 pbpb_NumberOfStoresClosed / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember | 2 pbpb_NumberOfStoresClosed / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember |  | 1 pbpb_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 |  | 39 us-gaap_NumberOfStores / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember / us-gaap_ProductOrServiceAxis = pbpb_NewShopsMember | 34 us-gaap_NumberOfStores / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember / us-gaap_ProductOrServiceAxis = pbpb_NewShopsMember |  | 31 us-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 |  | 1 pbpb_NumberOfStoresClosed / us-gaap_FranchisorDisclosureAxis = us-gaap_FranchisedUnitsMember | 0 pbpb_NumberOfStoresClosed / us-gaap_FranchisorDisclosureAxis = us-gaap_FranchisedUnitsMember |  | 0 pbpb_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 |  | 7 us-gaap_NumberOfStores / us-gaap_FranchisorDisclosureAxis = us-gaap_FranchisedUnitsMember / us-gaap_ProductOrServiceAxis = pbpb_NewShopsMember | 8 us-gaap_NumberOfStores / us-gaap_FranchisorDisclosureAxis = us-gaap_FranchisedUnitsMember / us-gaap_ProductOrServiceAxis = pbpb_NewShopsMember |  | 7 us-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 |  | 17 us-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 |  | 12 us-gaap_NumberOfStores / us-gaap_FranchisorDisclosureAxis = us-gaap_FranchisedUnitsMember / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember |  |  |

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