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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 26, 2012 | Dec. 28, 2011 | Dec. 29, 2010
Related Party Transactions [Abstract] |  |  |
Cash proceeds from related party sales | $ 0.5 | $ 0.3 | $ 1.5
(Loss) gains recognized from related party sales | $ (0.2) | $ 0.2 | $ 1.3

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- Definition Related Party Transactions, Gain (Loss) On Sale Of Owned Restaurants + References No definition available. + Details
Name: | denn_RelatedPartyTransactionsGainLossOnSaleOfOwnedRestaurants
Namespace Prefix: | denn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Related Party Transactions, Proceeds from Sale of Owned Restaurants + References No definition available. + Details
Name: | denn_RelatedPartyTransactionsProceedsFromSaleOfOwnedRestaurants
Namespace Prefix: | denn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration