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Employee Benefit Plans (Defined Contribution Plans) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 25, 2013 | Dec. 26, 2012
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 1.4 us-gaap_DefinedContributionPlanCostRecognized | $ 1.4 us-gaap_DefinedContributionPlanCostRecognized | $ 1.3 us-gaap_DefinedContributionPlanCostRecognized
Defined contribution 401(k) plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Maximum annual contribution per employee | 25.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_PlanNameAxis = denn_Definedcontribution401kplanMember |  |
Employer matching contribution | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_PlanNameAxis = denn_Definedcontribution401kplanMember |  |
Non-qualified deferred compensation plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Maximum annual contribution per employee | 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_PlanNameAxis = denn_NonqualifieddeferredcompensationplanMember |  |
Maximum incentive compensation deferral | 100.00%denn_DefinedContributionPlanMaximumAmountOfIncentiveCompensationDeferredPercent / us-gaap_PlanNameAxis = denn_NonqualifieddeferredcompensationplanMember |  |
Employer matching contribution | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_PlanNameAxis = denn_NonqualifieddeferredcompensationplanMember |  |

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- Definition Defined Contribution Plan, Maximum Amount of Incentive Compensation Deferred, Percent + References No definition available. + Details
Name: | denn_DefinedContributionPlanMaximumAmountOfIncentiveCompensationDeferredPercent
Namespace Prefix: | denn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=denn_Definedcontribution401kplanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=denn_NonqualifieddeferredcompensationplanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |