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Share Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 25, 2013 | Dec. 26, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |
Common stock shares repurchased during the period (shares) | 5,329,000 us-gaap_TreasuryStockSharesAcquired | 4,200,000 us-gaap_TreasuryStockSharesAcquired | 4,800,000 us-gaap_TreasuryStockSharesAcquired
Common stock shares repurchased during the period (value in US$) | $ 35,990 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 24,698 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 22,179 us-gaap_TreasuryStockValueAcquiredCostMethod
Remaining number of shares to be repurchased (shares) | 3,900,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |
Share Repurchase Program 2013 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares approved under stock repurchase program (shares) |  | 10,000,000 us-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) |  |  | 6,000,000 us-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 No definition available. + Details
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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 + Details
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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 + Details
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