Introduction and Basis of Presentation	9 Months Ended
Introduction and Basis of Presentation	Sep. 28, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Introduction and Basis of Presentation	Introduction and Basis of Presentation Denny’s Corporation, or the Company, is one of America’s largest full-service restaurant chains based on number of restaurants. As of September 28, 2022, the Company consisted of 1,666 restaurants, 1,592 of which were franchised/licensed restaurants and 74 of which were company operated. The Company consists of the Denny’s brand and the Keke’s Breakfast Café brand (“Keke’s”). Keke’s was acquired on July 20, 2022, see Note 3 for details. As of September 28, 2022, the Denny's brand consisted of 1,613 restaurants, 1,547 of which were franchised/licensed restaurants and 66 of which were company operated. At September 28, 2022, the Keke's brand consisted of 53 restaurants, 45 of which were franchised restaurants and eight of which were company operated. We manage our restaurant brands, Denny’s and Keke’s as operating segments. We aggregate our operating segments into one reportable segment based on similar economic characteristics, nature of products and services, methods to provide services, and types of customers between the brands. The global crisis resulting from the spread of coronavirus ("COVID-19") has had a substantial impact on our restaurant operations starting in the quarter ended March 25, 2020 with continuing impacts into the current quarter ended September 28, 2022, including impacts on labor and commodity costs and the ability of many franchise restaurants to return to 24/7 operations. While we have seen improvements compared to earlier periods during the COVID-19 pandemic, we cannot currently estimate the duration or future financial impact of the COVID-19 pandemic on our business. Ongoing material adverse effects of the COVID-19 pandemic for an extended period could negatively affect our business, results of operations, liquidity and financial condition and could impact our impairment assessments of accounts receivable, property, right-of-use ("ROU") assets, goodwill and intangible assets. Our unaudited consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim financial information. Therefore, certain information and notes normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted. In our opinion, all adjustments considered necessary for a fair presentation of the interim periods presented have been included. Such adjustments are of a normal and recurring nature. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. Actual results may differ from these estimates under different assumptions or conditions; however, we believe that our estimates are reasonable. These interim consolidated financial statements should be read in conjunction with our consolidated financial statements and notes thereto as of and for the fiscal year ended December 29, 2021 which are contained in our audited Annual Report on Form 10-K for the fiscal year ended December 29, 2021. The results of operations for the interim periods presented are not necessarily indicative of the results for the entire fiscal year ending December 28, 2022. Our significant interim accounting policies include the recognition of advertising and marketing costs, generally in proportion to revenue, and the recognition of income taxes using an estimated annual effective rate.