XML 82 R60.htm IDEA: XBRL DOCUMENT v3.20.4

Restructuring - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 03, 2020 USD ($)	Dec. 27, 2020 Employee	Dec. 27, 2020 USD ($)	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)
Number of employee reduce | Employee		35
General and administrative expenses			$ 35,009,000	$ 44,831,000	$ 44,826,000
Minimum [Member]
General and administrative expenses	$ 3,500,000
Maximum [Member]
General and administrative expenses	$ 4,000,000.0

X

- Definition

Number of employee reduce.

+ References

No definition available.

+ Details

Name:	pbpb_NumberOfEmployeeReduce
Namespace Prefix:	pbpb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Name:	us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: