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Introduction and Basis of Reporting	12 Months Ended
Introduction and Basis of Reporting	Dec. 27, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Introduction and Basis of Reporting	Introduction and Basis of Reporting Denny’s Corporation, or the Company, is one of America’s largest franchised full-service restaurant chains based on number of restaurants. As of December 27, 2023, the Company consisted of 1,631 restaurants, 1,558 of which were franchised/licensed restaurants and 73 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. See Note 3 for details. At December 27, 2023, the Denny’s brand consisted of 1,573 restaurants, 1,508 of which were franchised or licensed restaurants and 65 of which were company restaurants. Denny’s restaurants are operated in 50 states, the District of Columbia, two U.S. territories and 12 foreign countries with principal concentrations in California (23% of total restaurants), Texas (13%) and Florida (8%). At December 27, 2023, the Keke's brand consisted of 58 restaurants, 50 of which were franchised restaurants and eight of which were company operated. All Keke’s restaurants are located in Florida.