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