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v2.4.1.9

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 25, 2013
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Guarantor Obligations [Line Items] |  |
Liabilities included as a component of other noncurrent liabilities and deferred credits | $ 0.1 us-gaap_GuaranteeObligationsCurrentCarryingValue | $ 0.1 us-gaap_GuaranteeObligationsCurrentCarryingValue
Property Lease Guarantee [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum payments guaranteed | 2.0 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_PropertyLeaseGuaranteeMember |
Financial Guarantee [Member] |  |
Guarantor Obligations [Line Items] |  |
Loan amounts outstanding under the loan pools | 9.8 denn_GuarantorObligationsLoansPayableOfFranchisee / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember | 6.1 denn_GuarantorObligationsLoansPayableOfFranchisee / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember
Maximum payments guaranteed | $ 1.7 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember |

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- Definition Guarantor Obligations, Loans Payable of Franchisee + References No definition available. + Details
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Namespace Prefix: | denn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |