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

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- Definition Stock Issued During Period Shares Exercise Of Warrants + References No definition available. + Details
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Namespace Prefix: | pbpb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration