Business Segment Information Business Segment Information (Detail Textuals)	3 Months Ended
Mar. 26, 2013 segments
Segment Reporting [Abstract]
Segment Reporting Information Number Of Business Segments (in segments)	3
Maximum Delivered Cost On Fresh Dough Based On Retail Value Of End Product (as a percent)	27.00%

Maximum delivered cost of fresh dough based on the retail value of the end product.

No definition available.

Name:	pnra_MaximumDeliveredCostOnFreshDoughBasedOnRetailValueOfEndProduct
Namespace Prefix:	pnra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration