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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 28, 2014 Segment Subsidiaries JointVenture | Dec. 29, 2013 | Dec. 30, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of wholly owned subsidiaries | 19 pbpb_NumberOfWhollyOwnedSubsidiaries |  |
Number of joint ventures | 2 pbpb_NumberOfJointVentures |  |
Number of operating segments | 1 us-gaap_NumberOfOperatingSegments |  |
Number of reportable segments | 1 us-gaap_NumberOfReportableSegments |  |
Credit card receivables | $ 1,900,000 us-gaap_CreditCardReceivables | $ 3,000,000 us-gaap_CreditCardReceivables | $ 1,600,000 us-gaap_CreditCardReceivables
Capitalized costs | 900,000 pbpb_CapitalizedCostForConstructionAndDevelopmentActivities | 700,000 pbpb_CapitalizedCostForConstructionAndDevelopmentActivities | 700,000 pbpb_CapitalizedCostForConstructionAndDevelopmentActivities
Impairment charges | 2,900,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf | 1,100,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf | 200,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Disposal of assets damaged by Hurricane Sandy |  |  | 800,000 us-gaap_PropertyPlantAndEquipmentDisposals
Recognized impairment for intangible assets | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Advertising expenses | 2,200,000 us-gaap_AdvertisingExpense | 1,600,000 us-gaap_AdvertisingExpense | 1,800,000 us-gaap_AdvertisingExpense
Cost related to vested stock options | 2,543,000 us-gaap_ShareBasedCompensation | 11,610,000 us-gaap_ShareBasedCompensation | 2,825,000 us-gaap_ShareBasedCompensation
Cumulative adjustment | 200,000 us-gaap_CumulativeEffectOfProspectiveApplicationOfNewAccountingPrinciple |  |
Initial franchise fee | 300,000 us-gaap_InitialFranchiseFees | 300,000 us-gaap_InitialFranchiseFees | 200,000 us-gaap_InitialFranchiseFees
Royalty fees revenue | 1,200,000 us-gaap_FranchiseRevenue | 800,000 us-gaap_FranchiseRevenue | 700,000 us-gaap_FranchiseRevenue
IPO [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cost related to vested stock options |  | 7,600,000 us-gaap_ShareBasedCompensation / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Initial Franchise Fees [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred revenue | 200,000 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionAxis = pbpb_InitialFranchiseFeesMember | 200,000 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionAxis = pbpb_InitialFranchiseFeesMember | 100,000 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionAxis = pbpb_InitialFranchiseFeesMember
Franchise Development Agreement [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred revenue | $ 200,000 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionAxis = pbpb_FranchiseDevelopmentAgreementMember |  |
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Ownership interest rate | 65.00%pbpb_JointVentureOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Estimated period of time between Company's possession of leased space and shop opening date | 2 months |  |
Gift card breakage, period | 24 months |  |
Minimum [Member] | Computer Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 3 years |  |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 3 years |  |
Minimum [Member] | Computer Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 3 years |  |
Minimum [Member] | Machinery and Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 3 years |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 10 years |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Ownership interest rate | 75.00%pbpb_JointVentureOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Estimated period of time between Company's possession of leased space and shop opening date | 3 months |  |
Gift card breakage, period | 36 months |  |
Maximum [Member] | Computer Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 5 years |  |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 5 years |  |
Maximum [Member] | Computer Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 5 years |  |
Maximum [Member] | Machinery and Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 5 years |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 15 years |  |

X
- Definition Represents the internal costs associated with the development, design and construction of new shop locations. + References No definition available. + Details
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Namespace Prefix: | pbpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the estimated period of time between when the Company takes possession of the leased space and the shop opening date. + References No definition available. + Details
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Namespace Prefix: | pbpb_
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X
- Definition Joint Venture Ownership Percentage + References No definition available. + Details
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Balance Type: | na
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X
- Definition Number Of Joint Ventures + References No definition available. + Details
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- Definition Number Of Wholly Owned Subsidiaries + References No definition available. + Details
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X
- Definition Represents the period of inactivity on gift card balance after which revenue is recognized + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Period Type: | duration

X
- Definition Amounts receivable from issuing a card to individuals or businesses that allows someone to make a purchase on borrowed money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets as a result of a cumulative effect adjustment for prospective application of a new accounting principle. + References No definition available. + Details
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X
- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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X
- Definition Revenue earned during the period from consideration (often a percentage of the franchisee's sales) received for the right to operate a business using the entity's name, merchandise, services, methodologies, promotional support, marketing, and supplies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 952 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490812&loc=d3e68564-108043 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228 + Details
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- Definition The amount of initial franchise fees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 952 -SubTopic 605 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6490825&loc=d3e68606-108044 + Details
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X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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