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Introduction and Basis of Presentation	9 Months Ended
Introduction and Basis of Presentation	Sep. 26, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Introduction and Basis of Presentation	Introduction and Basis of Presentation Denny’s Corporation, or Denny’s or the Company, is one of America’s largest full-service restaurant chains based on number of restaurants. At September 26, 2018, the Denny's brand consisted of 1,715 restaurants, 1,534 of which were franchised/licensed restaurants and 181 of which were company operated. Our unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. 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, including those for the above-described items, are reasonable. These interim condensed consolidated financial statements should be read in conjunction with our consolidated financial statements and notes thereto for the year ended December 27, 2017 and the related Management’s Discussion and Analysis of Financial Condition and Results of Operations, both of which are contained in our Annual Report on Form 10-K for the fiscal year ended December 27, 2017. The results of operations for the interim periods presented are not necessarily indicative of the results for the entire fiscal year ending December 26, 2018.