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Accrued Expenses - Summary of Accrued Contract Termination Costs (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 28, 2014 | Dec. 29, 2013
Accrued Liabilities and Other Liabilities [Abstract] |  |
Accrued contract termination costs-beginning balance | $ 93 pbpb_ContractTerminationCosts | $ 151 pbpb_ContractTerminationCosts
Contract termination costs incurred | 749 pbpb_ContractTerminationCostsIncurred | 13 pbpb_ContractTerminationCostsIncurred
Contract termination costs settled and paid | (41)pbpb_ContractTerminationCostsSettledAndPaid | (71)pbpb_ContractTerminationCostsSettledAndPaid
Accrued contract termination costs-ending balance | $ 801 pbpb_ContractTerminationCosts | $ 93 pbpb_ContractTerminationCosts

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- Definition Contract Termination Costs + References No definition available. + Details
Name: | pbpb_ContractTerminationCosts
Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract Termination Costs Incurred + References No definition available. + Details
Name: | pbpb_ContractTerminationCostsIncurred
Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract Termination Costs Settled And Paid + References No definition available. + Details
Name: | pbpb_ContractTerminationCostsSettledAndPaid
Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration