XML 40 R31.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 28, 2014
Segment
Subsidiaries
JointVenture
Dec. 29, 2013
Dec. 30, 2012
Summary Of Significant Accounting Policies [Line Items]      
Number of wholly owned subsidiaries 19pbpb_NumberOfWhollyOwnedSubsidiaries    
Number of joint ventures 2pbpb_NumberOfJointVentures    
Number of operating segments 1us-gaap_NumberOfOperatingSegments    
Number of reportable segments 1us-gaap_NumberOfReportableSegments    
Credit card receivables $ 1,900,000us-gaap_CreditCardReceivables $ 3,000,000us-gaap_CreditCardReceivables $ 1,600,000us-gaap_CreditCardReceivables
Capitalized costs 900,000pbpb_CapitalizedCostForConstructionAndDevelopmentActivities 700,000pbpb_CapitalizedCostForConstructionAndDevelopmentActivities 700,000pbpb_CapitalizedCostForConstructionAndDevelopmentActivities
Impairment charges 2,900,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf 1,100,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf 200,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Disposal of assets damaged by Hurricane Sandy     800,000us-gaap_PropertyPlantAndEquipmentDisposals
Recognized impairment for intangible assets 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Advertising expenses 2,200,000us-gaap_AdvertisingExpense 1,600,000us-gaap_AdvertisingExpense 1,800,000us-gaap_AdvertisingExpense
Cost related to vested stock options 2,543,000us-gaap_ShareBasedCompensation 11,610,000us-gaap_ShareBasedCompensation 2,825,000us-gaap_ShareBasedCompensation
Cumulative adjustment 200,000us-gaap_CumulativeEffectOfProspectiveApplicationOfNewAccountingPrinciple    
Initial franchise fee 300,000us-gaap_InitialFranchiseFees 300,000us-gaap_InitialFranchiseFees 200,000us-gaap_InitialFranchiseFees
Royalty fees revenue 1,200,000us-gaap_FranchiseRevenue 800,000us-gaap_FranchiseRevenue 700,000us-gaap_FranchiseRevenue
IPO [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Cost related to vested stock options   7,600,000us-gaap_ShareBasedCompensation
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		  
Initial Franchise Fees [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Deferred revenue 200,000us-gaap_DeferredRevenue
/ us-gaap_RelatedPartyTransactionAxis
= pbpb_InitialFranchiseFeesMember		 200,000us-gaap_DeferredRevenue
/ us-gaap_RelatedPartyTransactionAxis
= pbpb_InitialFranchiseFeesMember		 100,000us-gaap_DeferredRevenue
/ us-gaap_RelatedPartyTransactionAxis
= pbpb_InitialFranchiseFeesMember
Franchise Development Agreement [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Deferred revenue $ 200,000us-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