Introduction and Basis of Presentation	3 Months Ended
Introduction and Basis of Presentation	Mar. 29, 2023
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 March 29, 2023, the Company consisted of 1,648 restaurants, 1,574 of which were franchised/licensed restaurants and 74 of which were company operated. The Company consists of the Denny’s brand ("Denny's") and the Keke’s Breakfast Café brand (“Keke’s”). Keke’s was acquired on July 20, 2022. As of March 29, 2023, the Denny's brand consisted of 1,594 restaurants, 1,528 of which were franchised/licensed restaurants and 66 of which were company operated. At March 29, 2023, the Keke's brand consisted of 54 restaurants, 46 of which were franchised restaurants and eight of which were company operated. Through the current quarter ended March 29, 2023, many Denny’s restaurants have not returned to full operating hours, since closing or reducing hours in 2020 due to the COVID-19 pandemic, particularly at the late night daypart. Additionally, our restaurant operations have been negatively impacted by a tight labor market and inflated commodity costs. Our operating results substantially depend upon the sales volumes, restaurant profitability, and financial stability of our company and franchised and licensed restaurants. We cannot currently estimate the duration or future negative financial impact of these economic conditions on our business. Ongoing material adverse effects of these economic conditions 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, intangible assets, long-lived assets and goodwill. 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 28, 2022 which are contained in our audited Annual Report on Form 10-K for the fiscal year ended December 28, 2022. The results of operations for the interim periods presented are not necessarily indicative of the results for the entire fiscal year ending December 27, 2023. 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.