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v3.21.1

Leases - Additional Information (Detail) $ in Millions | 3 Months Ended
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Mar. 28, 2021 USD ($) Termination
Leases [Abstract] |
Leases of terminated | Termination | 2
Lease termination fees | $ 0.2
Right-of-use assets derecognized upon lease termination | 0.6
Lease liabilities derecognized upon lease termination | 0.7
Gain recognized upon lease termination | 0.1
Decrease in the right-of-use asset and lease Liability | 2.7
Additional operating leases payments related to shops not yet open, amount | $ 0.0

X
- Definition Decrease in the right-of-use asset and lease liability. + References No definition available. + Details
Name: | pbpb_DecreaseInRightOfUseAssetAndLeaseLiability
Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lease liabilities derecognized upon lease termination. + References No definition available. + Details
Name: | pbpb_LeaseLiabilitiesDerecognizedUponLeaseTermination
Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of Lease termination fees. + References No definition available. + Details
Name: | pbpb_LeaseTerminationFees
Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lessee operating lease lease not yet commenced amount. + References No definition available. + Details
Name: | pbpb_LesseeOperatingLeaseLeaseNotYetCommencedAmount
Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of leases terminated. + References No definition available. + Details
Name: | pbpb_NumberOfLeasesTerminated
Namespace Prefix: | pbpb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Right-of-use assets derecognized upon lease termination. + References No definition available. + Details
Name: | pbpb_RightOfUseAssetsDerecognizedUponLeaseTermination
Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_GainLossOnTerminationOfLease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration