Cover - USD ($)	12 Months Ended
	Dec. 28, 2022	Feb. 23, 2023	Jun. 29, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 28, 2022
Current Fiscal Year End Date	--12-28
Document Transition Report	false
Entity File Number	0-18051
Entity Registrant Name	DENNY’S CORPORATION
Entity Incorporation, State or Country Code	DE
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	29319-9966
City Area Code	864
Local Phone Number	597-8000
Title of 12(b) Security	$.01 Par Value, Common Stock
Trading Symbol	DENN
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 432,398,476
Entity Common Stock, Shares Outstanding		56,424,922
Documents Incorporated by Reference	Portions of the registrant’s definitive Proxy Statement for the 2023 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.
Entity Central Index Key	0000852772
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false