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Summary of Significant Accounting Policies - (Derivative Instruments) (Details)	12 Months Ended
	Dec. 27, 2023
Accounting Policies [Abstract]
Derivative Asset, Statement Of Financial Position, Extensible Enumeration Not Disclosed Flag	Consolidated Balance Sheets
Derivative Liability, Statement Of Financial Position, Extensible Enumeration Not Disclosed Flag	Consolidated Balance Sheets

X

- Definition

Derivative Asset, Statement Of Financial Position, Extensible Enumeration Not Disclosed Flag

+ References

No definition available.

+ Details

Name:	denn_DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag
Namespace Prefix:	denn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Derivative Liability, Statement Of Financial Position, Extensible Enumeration Not Disclosed Flag

+ References

No definition available.

+ Details

Name:	denn_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag
Namespace Prefix:	denn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration