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