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Introduction and Basis of Reporting (Details)	Dec. 31, 2014 Countries restaurant States Territories
Franchisor Disclosure [Line Items]
Number of states in which entity operates	50us-gaap_NumberOfStatesInWhichEntityOperates
Number of territories in which entity operates	2denn_NumberOfTerritoriesInWhichEntityOperates
Number of foreign countries in which entity operates	9us-gaap_NumberOfCountriesInWhichEntityOperates
Number of restaurants	1,702us-gaap_NumberOfRestaurants
Franchised and licensed restaurants [Member]
Franchisor Disclosure [Line Items]
Number of restaurants	1,541us-gaap_NumberOfRestaurants / us-gaap_FranchisorDisclosureAxis = us-gaap_FranchisedUnitsMember
Company-owned restaurants [Member]
Franchisor Disclosure [Line Items]
Number of restaurants	161us-gaap_NumberOfRestaurants / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember
California
Franchisor Disclosure [Line Items]
Percentage of restaurants operated (percent)	24.00%denn_PercentageOfRestaurantsOperatedByGeographicLocationToNumberOfRestaurants / us-gaap_StatementGeographicalAxis = stpr_CA
Texas
Franchisor Disclosure [Line Items]
Percentage of restaurants operated (percent)	11.00%denn_PercentageOfRestaurantsOperatedByGeographicLocationToNumberOfRestaurants / us-gaap_StatementGeographicalAxis = stpr_TX
Florida
Franchisor Disclosure [Line Items]
Percentage of restaurants operated (percent)	8.00%denn_PercentageOfRestaurantsOperatedByGeographicLocationToNumberOfRestaurants / us-gaap_StatementGeographicalAxis = stpr_FL

X

- Definition

Number of Territories in which Entity Operates

+ References

No definition available.

+ Details

Name:	denn_NumberOfTerritoriesInWhichEntityOperates
Namespace Prefix:	denn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents ownership percentage of restaurants operated by the entity or franchisees.

+ References

No definition available.

+ Details

Name:	denn_PercentageOfRestaurantsOperatedByGeographicLocationToNumberOfRestaurants
Namespace Prefix:	denn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of restaurants.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRestaurants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FranchisorDisclosureAxis=us-gaap_EntityOperatedUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FranchisorDisclosureAxis=us-gaap_FranchisedUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_FL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_TX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: