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Goodwill Goodwill (Details) (USD $)
12 Months Ended
Dec. 30, 2014
Dec. 31, 2013
Dec. 25, 2012
Goodwill [Line Items]      
Goodwill, Impairment Loss $ (2,057,000)us-gaap_GoodwillImpairmentLoss    
Goodwill [Roll Forward]      
Goodwill Start 123,013,000us-gaap_Goodwill 121,903,000us-gaap_Goodwill  
Goodwill, Translation Adjustments (178,000)us-gaap_GoodwillTranslationAdjustments (173,000)us-gaap_GoodwillTranslationAdjustments  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   5,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles  
Goodwill End 120,778,000us-gaap_Goodwill 123,013,000us-gaap_Goodwill  
Florida Franchisee Acquisition [Member]      
Goodwill [Roll Forward]      
Goodwill, Acquired During Period   1,278,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= pnra_FloridaFranchiseeAcquisitionMember
 
Company Bakery Cafe Operations [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss (2,057,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
Goodwill [Roll Forward]      
Goodwill Start 119,384,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
118,274,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
 
Goodwill, Translation Adjustments (178,000)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
(173,000)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
 
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   5,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
 
Goodwill End 117,149,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
119,384,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
118,274,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
Company Bakery Cafe Operations [Member] | Florida Franchisee Acquisition [Member]      
Goodwill [Roll Forward]      
Goodwill, Acquired During Period   1,278,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= pnra_FloridaFranchiseeAcquisitionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_CompanyBakeryCafeOperationsMember
 
Franchise Operations [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
   
Goodwill [Roll Forward]      
Goodwill Start 1,934,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
1,934,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
 
Goodwill, Translation Adjustments 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
 
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   0us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
 
Goodwill End 1,934,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
1,934,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
 
Franchise Operations [Member] | Florida Franchisee Acquisition [Member]      
Goodwill [Roll Forward]      
Goodwill, Acquired During Period   0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= pnra_FloridaFranchiseeAcquisitionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FranchiseOperationsMember
 
Fresh dough and other product operations [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember
   
Goodwill [Roll Forward]      
Goodwill Start 1,695,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember
1,695,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember
 
Goodwill, Translation Adjustments 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember
0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember
 
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   0us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember
 
Goodwill End 1,695,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember
1,695,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember
 
Fresh dough and other product operations [Member] | Florida Franchisee Acquisition [Member]      
Goodwill [Roll Forward]      
Goodwill, Acquired During Period   $ 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= pnra_FloridaFranchiseeAcquisitionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pnra_FreshDoughAndOtherProductOperationsMember