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Segment Information (Details)
$ in Thousands
 12 Months Ended
Dec. 27, 2023
USD ($)
segment
Dec. 28, 2022
USD ($)
Dec. 29, 2021
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 2    
Segment Reporting Information [Line Items]      
Total operating revenue $ 463,922 $ 456,429 $ 398,174
General and administrative expenses 77,770 67,173 68,686
Depreciation and amortization 14,385 14,862 15,446
Goodwill impairment charges 6,363 0 0
Operating (gains), losses and other charges, net 2,530 (1,005) (46,105)
Total other operating expenses 101,048 81,030 38,027
Operating income 52,823 60,614 104,075
Interest expense, net 17,597 13,769 15,148
Other nonoperating expense (income), net 8,288 (52,585) (15,176)
Net income before income taxes 26,938 99,430 104,103
Provision for income taxes 6,993 24,718 26,030
Net income 19,945 74,712 78,073
Total assets 464,818 498,335  
Operating Segments      
Segment Reporting Information [Line Items]      
Total operating revenue 463,922 456,429 398,174
Total restaurant-level operating margin 153,871 141,644 142,102
Operating Segments | Denny’s      
Segment Reporting Information [Line Items]      
Total operating revenue 443,106 447,687 398,174
Total restaurant-level operating margin 146,833 138,555 142,102
Total assets 340,136 394,051  
Operating Segments | Other      
Segment Reporting Information [Line Items]      
Total operating revenue 20,816 8,742 0
Total restaurant-level operating margin 7,038 3,089 $ 0
Total assets $ 124,682 $ 104,284