XML 105 R92.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Other CARES Act Provisions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 29, 2021 | Dec. 30, 2020
Unusual or Infrequent Item, or Both [Line Items] |  |
Employee retention tax credit, | $ 0.8 | $ 2.6
Social security taxes | 3.1 |
Costs of company restaurant sales |  |
Unusual or Infrequent Item, or Both [Line Items] |  |
Employee retention tax credit, | 0.3 | 0.9
General and administrative expenses |  |
Unusual or Infrequent Item, or Both [Line Items] |  |
Employee retention tax credit, | $ 0.5 | $ 1.7

X
- Definition Deferred Payment Of Employer Portion Of Social Security Taxes, CARES Act + References No definition available. + Details
Name: | denn_DeferredPaymentOfEmployerPortionOfSocialSecurityTaxesCARESAct
Namespace Prefix: | denn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Employee Retention Tax Credit, CARES ACT, Amount Recorded + References No definition available. + Details
Name: | denn_EmployeeRetentionTaxCreditCARESACTAmountRecorded
Namespace Prefix: | denn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_UnusualOrInfrequentItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_FranchisorOwnedOutletMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |