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Leases - Gains Recognized Upon Termination of Lease Contracts (Detail) $ in Thousands	12 Months Ended
	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

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

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

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration