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Document and Entity Information
Nov. 03, 2025
Cover [Abstract]  
Entity Registrant Name DENNY'S Corp
Amendment Flag false
Entity Central Index Key 0000852772
Document Type 8-K
Document Period End Date Nov. 03, 2025
Entity Incorporation State 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
Security 12b Title $.01 Par Value, Common Stock
Trading Symbol DENN
Security Exchange Name NASDAQ
Written Communications false
Soliciting Material true
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false