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v3.21.2

Commitment and Contingencies (Details) $ in Millions | Sep. 29, 2021 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Purchase obligations | $ 18.1
Amount committed by the company | $ 5.7

X
- Definition Purchase Obligation, Amount Committed by the Company + References No definition available. + Details
Name: | denn_PurchaseObligationAmountCommittedByTheCompany
Namespace Prefix: | denn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant