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Leases - Gains Recognized Upon Termination of Lease Contracts (Detail) $ in Thousands | 12 Months Ended
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Dec. 27, 2020 USD ($) Termination | Dec. 29, 2019 USD ($) Termination
Leases [Abstract] |  |
Leases of terminated | Termination | 28 | 11
Lease termination fees | $ 2,832 | $ 3,130
Right-of-use assets derecognized upon lease termination | 14,774 | 6,506
Lease liabilities derecognized upon lease termination | 16,103 | 7,450
Gain recognized upon lease termination | $ 1,329 | $ 944

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- Definition Lease liabilities derecognized upon lease termination. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Amount of Lease termination fees. + References No definition available. + Details
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Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of leases terminated. + References No definition available. + Details
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Namespace Prefix: | pbpb_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Right-of-use assets derecognized upon lease termination. + References No definition available. + Details
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Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121604053&loc=SL77918607-209975 + Details
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Namespace Prefix: | us-gaap_
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- References No definition available. + Details
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