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Operating (Gains), Losses and Other Charges, Net (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 25, 2013 | Dec. 26, 2012
Other Income and Expenses [Abstract] |  |  |  |  |
Gains on sales of assets and other, net | $ (112,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment |  | $ (66,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment |  | $ (7,090,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Restructuring charges and exit costs | 981,000 us-gaap_RestructuringCharges |  | 1,389,000 us-gaap_RestructuringCharges |  | 3,912,000 us-gaap_RestructuringCharges
Impairment charges | 401,000 us-gaap_AssetImpairmentCharges |  | 5,748,000 us-gaap_AssetImpairmentCharges |  | 3,660,000 us-gaap_AssetImpairmentCharges
Operating (gains), losses and other charges, net | 1,270,000 us-gaap_OtherOperatingIncomeExpenseNet |  | 7,071,000 us-gaap_OtherOperatingIncomeExpenseNet |  | 482,000 us-gaap_OtherOperatingIncomeExpenseNet
Restructuring charges and exit costs [Abstract] |  |  |  |  |
Exit costs | 335,000 us-gaap_BusinessExitCosts1 | [1] | 630,000 us-gaap_BusinessExitCosts1 | [1] | 1,926,000 us-gaap_BusinessExitCosts1
Severance and other restructuring charges | 646,000 us-gaap_SeveranceCosts1 |  | 759,000 us-gaap_SeveranceCosts1 |  | 1,986,000 us-gaap_SeveranceCosts1
Total restructuring charges and exit costs | 981,000 us-gaap_RestructuringCharges |  | 1,389,000 us-gaap_RestructuringCharges |  | 3,912,000 us-gaap_RestructuringCharges
Components of change in accrued exit cost liabilities [Roll Forward] |  |  |  |  |
Balance, beginning of year | 3,149,000 us-gaap_RestructuringReserve |  | 4,061,000 us-gaap_RestructuringReserve |  |
Exit costs | 335,000 us-gaap_BusinessExitCosts1 | [1] | 630,000 us-gaap_BusinessExitCosts1 | [1] | 1,926,000 us-gaap_BusinessExitCosts1
Payments, net of sublease receipts | (1,426,000)us-gaap_PaymentsForRestructuring |  | (1,726,000)us-gaap_PaymentsForRestructuring |  |
Reclassification of certain lease assets and liabilities, net | (95,000)us-gaap_RestructuringReserveAccrualAdjustment |  | (69,000)us-gaap_RestructuringReserveAccrualAdjustment |  |
Interest accretion | 179,000 us-gaap_AccretionExpense |  | 253,000 us-gaap_AccretionExpense |  |
Balance, end of year | 2,142,000 us-gaap_RestructuringReserve |  | 3,149,000 us-gaap_RestructuringReserve |  | 4,061,000 us-gaap_RestructuringReserve
Less current portion included in other current liabilities | 483,000 us-gaap_RestructuringReserveCurrent |  | 1,260,000 us-gaap_RestructuringReserveCurrent |  |
Long-term portion included in other noncurrent liabilities | 1,659,000 us-gaap_RestructuringReserveNoncurrent |  | 1,889,000 us-gaap_RestructuringReserveNoncurrent |  |
Estimated net cash payments related to exit cost liabilities [Abstract] |  |  |  |  |
2015 | 596,000 denn_ExitCostsFutureEstimatedPaymentsPaymentsDueNextTwelveMonths |  |  |  |
2016 | 346,000 denn_ExitCostsFutureEstimatedPaymentsPaymentsDueInTwoYears |  |  |  |
2017 | 289,000 denn_ExitCostsFutureEstimatedPaymentsPaymentsDueInThreeYears |  |  |  |
2018 | 301,000 denn_ExitCostsFutureEstimatedPaymentsPaymentsDueInFourYears |  |  |  |
2019 | 272,000 denn_ExitCostsFutureEstimatedPaymentsPaymentsDueInFiveYears |  |  |  |
Thereafter | 901,000 denn_ExitCostsFutureEstimatedPaymentsThereafter |  |  |  |
Total | 2,705,000 denn_ExitCostsFutureEstimatedPayments |  |  |  |
Less imputed interest | 563,000 denn_ExitCostsImputedInterestOnFutureEstimatedPayments |  |  |  |
Present value of exit cost liabilities | 2,142,000 denn_ExitCostsFutureEstimatedPaymentsPresentValue |  |  |  |
Existing sublease arrangements | 2,400,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals |  |  |  |
Properties expected to enter into sublease arrangements in the future | 1,400,000 denn_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsExpectedContractualAmounts |  |  |  |
Impairment charges | 401,000 us-gaap_AssetImpairmentCharges |  | 5,748,000 us-gaap_AssetImpairmentCharges |  | 3,660,000 us-gaap_AssetImpairmentCharges
Impairment of assets held and used |  |  | 4,800,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |
Impairment of assets identified as assets held for sale |  |  | $ 800,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |
[1] | Included as a component of operating (gains), losses and other charges, net.

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