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Share Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 25, 2013	Dec. 26, 2012
Equity, Class of Treasury Stock [Line Items]
Common stock shares repurchased during the period (shares)	5,329,000us-gaap_TreasuryStockSharesAcquired	4,200,000us-gaap_TreasuryStockSharesAcquired	4,800,000us-gaap_TreasuryStockSharesAcquired
Common stock shares repurchased during the period (value in US$)	$ 35,990us-gaap_TreasuryStockValueAcquiredCostMethod	$ 24,698us-gaap_TreasuryStockValueAcquiredCostMethod	$ 22,179us-gaap_TreasuryStockValueAcquiredCostMethod
Remaining number of shares to be repurchased (shares)	3,900,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Share Repurchase Program 2013 [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares approved under stock repurchase program (shares)		10,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = denn_ShareRepurchaseProgram2013Member
Share Repurchase Program 2012 [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares approved under stock repurchase program (shares)			6,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = denn_ShareRepurchaseProgram2012Member

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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