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Stock Based Compensation Stock Based Compensation (Details Textuals) (USD $)
 12 Months Ended
Dec. 30, 2014
Dec. 31, 2013
Dec. 25, 2012
Jun. 05, 2014
May 13, 2010
May 01, 2006
May 01, 1992
Jun. 01, 2001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Incentive Compensation Expense $ 11,100,000pnra_IncentiveCompensationExpense $ 16,000,000pnra_IncentiveCompensationExpense $ 16,700,000pnra_IncentiveCompensationExpense          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 1,100,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 900,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 1,000,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount          
Vesting Percentage (as a percent) 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage              
Proceeds from Stock Options Exercised 1,116,000us-gaap_ProceedsFromStockOptionsExercised 573,000us-gaap_ProceedsFromStockOptionsExercised 4,455,000us-gaap_ProceedsFromStockOptionsExercised          
Tax Benefit from Exercise of Stock Options 3,089,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 8,100,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 8,587,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation          
Performance Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Incentive Compensation Expense 1,200,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember		 4,300,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember		 6,300,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember		          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 100,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember		 200,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember		 300,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember		          
Share Based Compensation Arrangement By Share Based Payment Award Award Performance Period 3 years              
Percentage paid in Cash (as a percent) 50.00%pnra_PercentagePaidInCash
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember		              
Percentage paid in stock (as a percent) 50.00%pnra_PercentagePaidInStock
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember		              
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%pnra_ShareBasedCompensationArrangementByShareBasedPaymentAwardAchievementMeasurement
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
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%pnra_ShareBasedCompensationArrangementByShareBasedPaymentAwardAchievementMeasurement
/ us-gaap_AwardTypeAxis
= pnra_PerformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Incentive Compensation Expense 8,300,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 9,200,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 7,600,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 900,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 600,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 500,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years) 5 years              
Vesting Percentage (as a percent) 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		              
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 39,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		              
Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years) 3 years 7 months 25 days              
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 3,300,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 3,400,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 3,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		          
Deferred Bonus [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Incentive Compensation Expense 1,300,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_DeferredBonusMember		 2,100,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_DeferredBonusMember		 2,300,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_DeferredBonusMember		          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 100,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= us-gaap_DeferredBonusMember		 100,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= us-gaap_DeferredBonusMember		 200,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= us-gaap_DeferredBonusMember		          
Share Based Compensation Arrangement By Share Based Payment Award AchievementMeasurement 50.00%pnra_ShareBasedCompensationArrangementByShareBasedPaymentAwardAchievementMeasurement
/ us-gaap_AwardTypeAxis
= us-gaap_DeferredBonusMember		              
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%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		              
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 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		              
Day Closing Stock Price $ 174.87pnra_DayClosingStockPrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		              
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 100,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 100,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		          
Compensation Expense Charged to general and administrative 100,000pnra_CompensationExpenseChargedToGeneralAndAdministrative
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 200,000pnra_CompensationExpenseChargedToGeneralAndAdministrative
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 400,000pnra_CompensationExpenseChargedToGeneralAndAdministrative
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		          
Stock Appreciation Rights (SARs) [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%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		              
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 1,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		              
Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years) 3 years 7 months              
Day Closing Stock Price $ 174.87pnra_DayClosingStockPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		              
SSARs outstanding weighted average period of conversion (in years) 4 years 4 years 5 months 25 days            
Stock Appreciation Rights (SARs) [Member] | General and Administrative Expense [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Incentive Compensation Expense 200,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 200,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 100,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		          
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) $ 192.65pnra_SsarsConversionPriceRange
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
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) $ 75.80pnra_SsarsConversionPriceRange
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
1992 Employee Stock Purchase Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of Shares Authorized (in shares)   950,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		   1,050,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		        
Incentive Compensation Expense 600,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 500,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 500,000pnra_IncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		          
Employee limit for stock purchase plan (as a percent) 10.00%pnra_EmployeeLimitForStockPurchasePlan
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		              
Percent of Stock paid by Employee (as a percent) 85.00%pnra_PercentOfStockPaidByEmployee
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		              
Stock Issued During Period, Employee Stock Purchase Plans (in shares) 23,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 20,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 19,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		          
Fair Value of Purchase Rights for ESPP (in dollars per share) $ 24.71pnra_ValuePerShareOfEsppShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 $ 25.01pnra_ValuePerShareOfEsppShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 $ 22.68pnra_ValuePerShareOfEsppShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		          
Stock Issued Cumulative Employee Stock Purchase Plan 901,000pnra_StockIssuedCumulativeEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 878,000pnra_StockIssuedCumulativeEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 858,000pnra_StockIssuedCumulativeEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		          
2006 Stock Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of Shares Authorized (in shares)         2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ pnra_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= pnra_A2006StockIncentivePlanMember		 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ pnra_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= pnra_A2006StockIncentivePlanMember		    
Equity Incentive Plan 1992 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of Shares Authorized (in shares)             8,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ pnra_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= pnra_EquityIncentivePlan1992Member		  
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)               3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ pnra_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= pnra_EmployeeDirectorAndConsultantStockPlan2001Member
Additional Paid-in Capital [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Tax Benefit from Exercise of Stock Options $ 3,089,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 8,100,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 8,587,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember