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Income Taxes (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 25, 2013 | Dec. 26, 2012
Valuation Allowance [Line Items] |  |  |
Tax benefit recognized | $ (270,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ (420,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ (661,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Out-of-period discrete tax adjustment | (500,000)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions |  | 1,700,000 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Deferred tax benefit | 13,215,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 9,100,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 11,423,000 us-gaap_DeferredIncomeTaxExpenseBenefit
Tax credit carryforward | 22,089,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness | 29,490,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness |
Alternative minimum tax credit carryforwards | 7,811,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 10,344,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |
Valuation allowance, amount to be credited to paid-in capital | 2,000,000 denn_ValuationAllowanceDeferredTaxAssetAmountToBeCreditedToPaidInCapital |  |
South Carolina net operating loss carryforwards | 78.00%denn_OperatingLossCarryforwardsStateAndLocalPercentageOfIncomeTaxAuthority |  |
Unrecognized tax benefits | 0 us-gaap_UnrecognizedTaxBenefits | 0 us-gaap_UnrecognizedTaxBenefits |
General Business Tax Credit Carryforward [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred tax benefit |  | 300,000 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = us-gaap_GeneralBusinessMember |
Tax credit carryforward | 24,700,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness / us-gaap_TaxCreditCarryforwardAxis = us-gaap_GeneralBusinessMember |  |
Tax credit carryforwards unrecognized | 5,300,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_TaxCreditCarryforwardAxis = us-gaap_GeneralBusinessMember |  |
Alternative Minimum Tax Credit Carryforward [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Alternative minimum tax credit carryforwards | 7,800,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax / us-gaap_TaxCreditCarryforwardAxis = denn_AlternativeMinimumTaxCreditCarryforwardMember |  |
AMT NOL Carryforwards [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
NOL carryforwards | 28,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = denn_NetOperatingLossesAlternativeMinimumTaxMember |  |
State and Local Jurisdiction [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Tax benefit recognized |  | (200,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
State job tax credits | 700,000 us-gaap_IncomeTaxReconciliationTaxCredits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 800,000 us-gaap_IncomeTaxReconciliationTaxCredits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Additional state job tax credits | 500,000 us-gaap_IncomeTaxReconciliationTaxCreditsOther / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Out-of-period discrete tax adjustment |  |  | $ 1,600,000 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember

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- Definition Operating Loss Carryforwards, State and Local, Percentage of Income Tax Authority + References No definition available. + Details
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- Definition Valuation Allowance, amount to be credited to paid-in capital + References No definition available. + Details
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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible general business tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28511-109314 + Details
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