Business Combinations and Divestitures (Details Textuals) - USD ($)	3 Months Ended
Mar. 28, 2017	Mar. 29, 2016
Business Acquisitions And Divestitures [Line Items]
Lease termination costs and impairment of long-lived assets	$ 0	$ 905,000
Disposal Group, Including Discontinued Operation, Other Expense	0	166,000
Refranchising loss	$ 0	$ 1,071,000

Business Acquisitions And Divestitures Line Items [Line Items]

No definition available.

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- Definition

Lease termination costs and impairment of long-lived assets associated with the Company's refranchising initiative.

+ References

No definition available.

+ Details

Name:	pnra_LeaseTerminationCostsandImpairmentofLongLivedAssets
Namespace Prefix:	pnra_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Various charges incurred by the company in conjunction with refranchising efforts.

+ References

No definition available.

+ Details

Name:	pnra_Refranchisingloss
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of other expense attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration