Summary of Significant Accounting Policies	9 Months Ended
Sep. 29, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation The unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q, which consist of the accounts of Panera Bread Company and its wholly owned direct and indirect subsidiaries (collectively, the “Company”), have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”), under the rules and regulations of the United States Securities and Exchange Commission (the “SEC”), and on a basis substantially consistent with the audited consolidated financial statements of the Company as of and for the fiscal year ended December 30, 2014 (“fiscal 2014”). These unaudited consolidated financial statements should be read in conjunction with such audited consolidated financial statements, which are included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 30, 2014, as filed with the SEC on February 23, 2015. All intercompany balances and transactions have been eliminated in consolidation. The Consolidated Balance Sheet data as of December 30, 2014 was derived from audited financial statements, but does not include all disclosures required by GAAP contained herein. The unaudited consolidated financial statements include all adjustments (consisting of normal recurring adjustments and accruals) that management considers necessary for a fair statement of the Company's financial position and comprehensive income for the interim periods presented. Interim results are not necessarily indicative of the results for any other interim period or for the entire fiscal year. Recent Accounting Pronouncements In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360)”. This update was issued to clarify the reporting for discontinued operations and disclosures for disposals of components of an entity. This update is effective for annual and interim periods beginning after December 15, 2014. The adoption of this update did not have a material effect on the Company’s consolidated financial statements or related disclosures; however, it may impact the reporting of future discontinued operations if and when they occur. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)”. This update provides a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. The guidance also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts. In August 2015, the FASB issued ASU 2015-14 delaying the effective date for adoption. The update is now effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted. The update permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect this guidance will have on the Company's consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting. In August 2014, the FASB issued ASU 2014-15, “Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern”. This update requires management of the Company to evaluate whether there is substantial doubt about the Company’s ability to continue as a going concern. This update is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter. Early adoption is permitted. The Company is currently evaluating the effect of the standard but its adoption is not expected to have an impact on the Company’s consolidated financial statements. In April 2015, the FASB issued ASU 2015-03, “Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs”. This update requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct deduction from the carrying value of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs were not affected by this update. The Company early adopted ASU 2015-03 during the thirteen weeks ended June 30, 2015. As a result of the retrospective adoption, the Company reclassified unamortized debt issuance costs of $0.2 million as of December 30, 2014 from Deposits and other to Long-term debt in the Consolidated Balance Sheets. Adoption of this standard did not impact the Company's results of operations or cash flows in either the current or previous interim and annual reporting periods. In July 2015, the FASB issued ASU 2015-11, “Inventory (Topic 330): Simplifying the Measurement of Inventory”. This update provides guidance on the subsequent measurement of inventory, which changes the measurement from lower of cost or market to lower of cost and net realizable value. This update is effective for annual and interim periods beginning after December 15, 2016. The adoption of this guidance is not expected to have a material effect on the Company's consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, “Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments”. This update eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. Acquirers would now recognize measurement-period adjustments during the period in which they determine the amount of the adjustment. This update is effective for annual and interim reporting periods beginning after December 15, 2015, including interim periods within those fiscal years, and should be applied prospectively to adjustments for provisional amounts that occur after the effective date with early adoption permitted for financial statements that have not been issued. The adoption of this guidance is not expected to have a material effect on the Company's consolidated financial statements.

Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q, which consist of the accounts of Panera Bread Company and its wholly owned direct and indirect subsidiaries (collectively, the “Company”), have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”), under the rules and regulations of the United States Securities and Exchange Commission (the “SEC”), and on a basis substantially consistent with the audited consolidated financial statements of the Company as of and for the fiscal year ended December 30, 2014 (“fiscal 2014”). These unaudited consolidated financial statements should be read in conjunction with such audited consolidated financial statements, which are included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 30, 2014, as filed with the SEC on February 23, 2015. All intercompany balances and transactions have been eliminated in consolidation. The Consolidated Balance Sheet data as of December 30, 2014 was derived from audited financial statements, but does not include all disclosures required by GAAP contained herein.

The unaudited consolidated financial statements include all adjustments (consisting of normal recurring adjustments and accruals) that management considers necessary for a fair statement of the Company's financial position and comprehensive income for the interim periods presented. Interim results are not necessarily indicative of the results for any other interim period or for the entire fiscal year.

Recent Accounting Pronouncements

In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360)”. This update was issued to clarify the reporting for discontinued operations and disclosures for disposals of components of an entity. This update is effective for annual and interim periods beginning after December 15, 2014. The adoption of this update did not have a material effect on the Company’s consolidated financial statements or related disclosures; however, it may impact the reporting of future discontinued operations if and when they occur.

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)”. This update provides a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. The guidance also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts. In August 2015, the FASB issued ASU 2015-14 delaying the effective date for adoption. The update is now effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted. The update permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect this guidance will have on the Company's consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting.

In August 2014, the FASB issued ASU 2014-15, “Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern”. This update requires management of the Company to evaluate whether there is substantial doubt about the Company’s ability to continue as a going concern. This update is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter. Early adoption is permitted. The Company is currently evaluating the effect of the standard but its adoption is not expected to have an impact on the Company’s consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03, “Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs”. This update requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct deduction from the carrying value of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs were not affected by this update. The Company early adopted ASU 2015-03 during the thirteen weeks ended June 30, 2015. As a result of the retrospective adoption, the Company reclassified unamortized debt issuance costs of $0.2 million as of December 30, 2014 from Deposits and other to Long-term debt in the Consolidated Balance Sheets. Adoption of this standard did not impact the Company's results of operations or cash flows in either the current or previous interim and annual reporting periods.

In July 2015, the FASB issued ASU 2015-11, “Inventory (Topic 330): Simplifying the Measurement of Inventory”. This update provides guidance on the subsequent measurement of inventory, which changes the measurement from lower of cost or market to lower of cost and net realizable value. This update is effective for annual and interim periods beginning after December 15, 2016. The adoption of this guidance is not expected to have a material effect on the Company's consolidated financial statements.

In September 2015, the FASB issued ASU 2015-16, “Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments”. This update eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. Acquirers would now recognize measurement-period adjustments during the period in which they determine the amount of the adjustment. This update is effective for annual and interim reporting periods beginning after December 15, 2015, including interim periods within those fiscal years, and should be applied prospectively to adjustments for provisional amounts that occur after the effective date with early adoption permitted for financial statements that have not been issued. The adoption of this guidance is not expected to have a material effect on the Company's consolidated financial statements.