    <SEC-DOCUMENT>0000852772-21-000005-index.html : 20210111
    <SEC-HEADER>0000852772-21-000005.hdr.sgml : 20210111
    <ACCEPTANCE-DATETIME>20210111080258
    ACCESSION NUMBER:		0000852772-21-000005
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		17
    CONFORMED PERIOD OF REPORT:	20210111
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20210111
    DATE AS OF CHANGE:		20210111

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			DENNY'S Corp
    		CENTRAL INDEX KEY:			0000852772
    		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-EATING PLACES [5812]
    		IRS NUMBER:				133487402
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1225

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-18051
    		FILM NUMBER:		21519328

    	BUSINESS ADDRESS:
    		STREET 1:		203 EAST MAIN STREET
    		CITY:			SPARTANBURG
    		STATE:			SC
    		ZIP:			29319
    		BUSINESS PHONE:		8645978000

    	MAIL ADDRESS:
    		STREET 1:		203 EAST MAIN STREET
    		CITY:			SPARTANBURG
    		STATE:			SC
    		ZIP:			29319

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	DENNYS CORP
    		DATE OF NAME CHANGE:	20020801

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ADVANTICA RESTAURANT GROUP INC
    		DATE OF NAME CHANGE:	19980107

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	FLAGSTAR COMPANIES INC
    		DATE OF NAME CHANGE:	19930722
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>denn-20210111.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: denn-20210111.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>q42020pre-releaseearningsp.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: q42020pre-releaseearningsp.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>denn-20210111.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 3 - file: denn-20210111.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.CAL
    <SEQUENCE>4
    <FILENAME>denn-20210111_cal.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
    <TEXT>
    Document 4 - file: denn-20210111_cal.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>5
    <FILENAME>denn-20210111_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: denn-20210111_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>6
    <FILENAME>denn-20210111_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: denn-20210111_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>7
    <FILENAME>denn-20210111_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: denn-20210111_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>denn-20210111_g1.jpg
    <TEXT>
    Document 8 - file: denn-20210111_g1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>image_01a.jpg
    <TEXT>
    Document 9 - file: image_01a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>10
    <FILENAME>denn-20210111_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 10 - file: denn-20210111_htm.html

    Document 10 - RAW XML: denn-20210111_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>11
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 11 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>12
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 12 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 13 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 14 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>15
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 15 - file: FilingSummary.html

    Document 15 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>17
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 17 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>18
    <FILENAME>0000852772-21-000005-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 18 - file: 0000852772-21-000005-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>