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v2.4.0.8

Introduction and Basis of Presentation (Details) | 3 Months Ended
--- | ---
Mar. 26, 2014 restaurant | Mar. 27, 2013 restaurant
Entity and franchisee unit activity [Roll Forward] |  |
Units, end of period | 1,696 | 1,689
Company restaurants [Member] |  |
Entity and franchisee unit activity [Roll Forward] |  |
Units, beginning of period | 163 | 164
Units opened | 0 | 0
Units closed | (2) | 0
Units, end of period | 161 | 164
Franchised and licensed restaurants [Member] |  |
Entity and franchisee unit activity [Roll Forward] |  |
Units, beginning of period | 1,537 | 1,524
Units opened | 4 | 7
Units closed | (6) | (6)
Units, end of period | 1,535 | 1,525

X
- Details
Name: | denn_EntityandfranchiseeunitactivityRollForward
Namespace Prefix: | denn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents number of units closed by an entity and franchisee during the period. + References No definition available. + Details
Name: | denn_UnitsClosed
Namespace Prefix: | denn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents number of units opened by an entity and franchisee during the period. + References No definition available. + Details
Name: | denn_UnitsOpened
Namespace Prefix: | denn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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