XML 22 R46.htm IDEA: XBRL DOCUMENT v2.4.1.9

Capital Stock and Warrants - Summary of Issued Warrants (Detail)	12 Months Ended
	Dec. 29, 2013	Dec. 28, 2014
Equity [Abstract]
Unexercised Warrants Outstanding	359,596us-gaap_ClassOfWarrantOrRightOutstanding	241,704us-gaap_ClassOfWarrantOrRightOutstanding
Exercise of warrants at $0.01 per share	(117,892)pbpb_StockIssuedDuringPeriodSharesExerciseOfWarrants
Unexercised Warrants Outstanding	241,704us-gaap_ClassOfWarrantOrRightOutstanding	241,704us-gaap_ClassOfWarrantOrRightOutstanding

X

- Definition

Stock Issued During Period Shares Exercise Of Warrants

+ References

No definition available.

+ Details

Name:	pbpb_StockIssuedDuringPeriodSharesExerciseOfWarrants
Namespace Prefix:	pbpb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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