XML 11 R1.htm IDEA: XBRL DOCUMENT v3.25.0.1
Cover Page
 12 Months Ended
Feb. 03, 2025
Dec. 31, 2025
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Feb. 03, 2025  
Entity Registrant Name DENNY’S CORPORATION  
Entity Central Index Key 0000852772  
Amendment Flag false  
Entity Incorporation, State or Country Code DE  
Entity File Number 0-18051  
Entity Tax Identification Number 13-3487402  
Entity Address, Address Line One 203 East Main Street  
Entity Address, City or Town Spartanburg  
Entity Address, State or Province SC  
Entity Address, Postal Zip Code 29319-0001  
City Area Code 864  
Local Phone Number 597-8000  
Entity Information, Former Legal or Registered Name Not Applicable  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security $.01 Par Value, Common Stock  
Trading Symbol DENN  
Security Exchange Name NASDAQ  
Entity Emerging Growth Company false  
Current Fiscal Year End Date   --12-31