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

X

- 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

X

- 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

X

- Details

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