Compensation Expense Charged to general and administrative expense

No definition available.

Name:	pnra_CompensationExpenseChargedToGeneralAndAdministrative
Namespace Prefix:	pnra_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the Closing Stock Price

+ References

No definition available.

+ Details

Name:	pnra_DayClosingStockPrice
Namespace Prefix:	pnra_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the limit on the percentage of current year compensation which an employee is permitted to use to purchase shares under the plan.

+ References

No definition available.

+ Details

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

- Definition

Holding Period before vesting begins

+ References

No definition available.

+ Details

Name:	pnra_HoldingPeriod
Namespace Prefix:	pnra_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents incentive compensation related to share-based compensation plans and the entity's deferred annual bonus plans.

+ References

No definition available.

+ Details

Name:	pnra_IncentiveCompensationExpense
Namespace Prefix:	pnra_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the purchase price expressed as a percentage of the fair market value of common stock.

+ References

No definition available.

+ Details

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

- Definition

Percentage of performance award paid in Cash

+ References

No definition available.

+ Details

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

- Definition

Share Based Compensation Arrangement By Share Based Payment Award Achievement Measurement

+ References

No definition available.

+ Details

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

- Definition

Represents the performance period used to measure achievement of performance goals for awards granted under a share-based compensation plan.

+ References

No definition available.

+ Details

Name:	pnra_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod
Namespace Prefix:	pnra_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period over which shares issued under a share-based compensation plan vest after an initial holding period.

+ References

No definition available.

+ Details

Name:	pnra_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodAfterInitialHoldingPeriod
Namespace Prefix:	pnra_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

SSARs conversion price range

+ References

No definition available.

+ Details

Name:	pnra_SsarsConversionPriceRange
Namespace Prefix:	pnra_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of shares issued under the employee stock purchase plan since inception.

+ References

No definition available.

+ Details

Name:	pnra_StockIssuedCumulativeEmployeeStockPurchasePlan
Namespace Prefix:	pnra_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair Value (dollars per share) of Purchase Rights for ESPP

+ References

No definition available.

+ Details

Name:	pnra_ValuePerShareOfEsppShares
Namespace Prefix:	pnra_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 740
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65880886&loc=d3e23524-113945

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

Name:	us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

+ Details

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

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=pnra_PerformancePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_DeferredBonusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_StockAppreciationRightsSARSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnra_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis=pnra_A2015StockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnra_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis=pnra_EquityIncentivePlan1992Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnra_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis=pnra_EmployeeDirectorAndConsultantStockPlan2001Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock Based Compensation Stock Based Compensation (Details Textuals)	12 Months Ended
	Dec. 27, 2016 USD ($) $ / shares shares	Dec. 29, 2015 USD ($) $ / shares shares	Dec. 30, 2014 USD ($) $ / shares shares	May 21, 2015 shares	Jun. 05, 2014 shares	Jun. 01, 2001 shares	May 01, 1992 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Compensation Expense	$ 18,100,000	$ 16,400,000	$ 11,100,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 1,700,000	1,500,000	1,100,000
Vesting Percentage (as a percent)	25.00%
Proceeds from Stock Options Exercised	$ 381,000	288,000	1,116,000
Tax Benefit from Exercise of Stock Options	2,456,000	2,057,000	3,089,000
Performance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Compensation Expense	4,100,000	2,000,000	1,200,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 200,000	100,000	100,000
Share Based Compensation Arrangement By Share Based Payment Award Award Performance Period	3 years
Percentage paid in Cash (as a percent)	100.00%
Performance Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award AchievementMeasurement	300.00%
Performance Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award AchievementMeasurement	0.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Compensation Expense	$ 12,800,000	12,600,000	8,300,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 1,400,000	1,300,000	900,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years)	5 years
Vesting Percentage (as a percent)	25.00%
Holding Period (in years)	2 years
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period After Initial Holding Period	3 years
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 43,800,000
Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years)	3 years 4 months 24 days
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 5,100,000	5,000,000	3,300,000
Deferred Bonus [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Compensation Expense	400,000	1,100,000	1,300,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 100,000	100,000	100,000
Share Based Compensation Arrangement By Share Based Payment Award AchievementMeasurement	50.00%
Holding Period (in years)	3 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years)	6 years
Vesting Percentage (as a percent)	25.00%
Holding Period (in years)	2 years
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period After Initial Holding Period	3 years
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 0
Day Closing Stock Price \| $ / shares	210.40
Compensation Expense Charged to general and administrative	$ 200,000	200,000	100,000
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 100,000	$ 100,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years)	6 years
Vesting Percentage (as a percent)	25.00%
Holding Period (in years)	2 years
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period After Initial Holding Period	3 years
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 1,400,000
Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years)	2 years 4 months 24 days
Day Closing Stock Price \| $ / shares	210.40
SSARs outstanding weighted average period of conversion (in years)	3 years 10 months 24 days	4 years 6 months
Stock Appreciation Rights (SARs) [Member] \| General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Compensation Expense	$ 600,000	$ 500,000	$ 200,000
Stock Appreciation Rights (SARs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SSARs conversion price range (in dollars per share) \| $ / shares	$ 215.78
Stock Appreciation Rights (SARs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SSARs conversion price range (in dollars per share) \| $ / shares	$ 99.30
1992 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized (in shares) \| shares			950,000		1,050,000
Incentive Compensation Expense	$ 700,000	$ 600,000	$ 600,000
Employee limit for stock purchase plan (as a percent)	10.00%
Percent of Stock paid by Employee (as a percent)	85.00%
Stock Issued During Period, Employee Stock Purchase Plans (in shares) \| shares	22,000	24,000	23,000
Fair Value of Purchase Rights for ESPP (in dollars per share) \| $ / shares	$ 30.20	$ 26.21	$ 24.71
Stock Issued Cumulative Employee Stock Purchase Plan \| shares	947,000	925,000	901,000
2015 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized (in shares) \| shares				1,750,000
Equity Incentive Plan 1992 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized (in shares) \| shares							8,600,000
Employee Director And Consultant Stock Plan 2001 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized (in shares) \| shares						3,000,000
Additional Paid-in Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax Benefit from Exercise of Stock Options	$ 2,456,000	$ 2,057,000	$ 3,089,000