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Goodwill Goodwill (Detail Textuals) (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    
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