Introduction and Basis of Presentation (Details)	Mar. 27, 2024 restaurant
Franchisor Disclosure [Line Items]
Number of restaurants	1,614
Denny's Brand
Franchisor Disclosure [Line Items]
Number of restaurants	1,553
Keke's
Franchisor Disclosure [Line Items]
Number of restaurants	61
Franchised/licensed Restaurants
Franchisor Disclosure [Line Items]
Number of restaurants	1,539
Franchised/licensed Restaurants | Denny's Brand
Franchisor Disclosure [Line Items]
Number of restaurants	1,489
Franchised/licensed Restaurants | Keke's
Franchisor Disclosure [Line Items]
Number of restaurants	50
Company Restaurants
Franchisor Disclosure [Line Items]
Number of restaurants	75
Company Restaurants | Denny's Brand
Franchisor Disclosure [Line Items]
Number of restaurants	64
Company Restaurants | Keke's
Franchisor Disclosure [Line Items]
Number of restaurants	11