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Commitments and Contingencies Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Sep. 24, 2014 | Dec. 25, 2013
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Guarantor Obligations [Line Items] |  |
Guarantee liabilities included as a component of other noncurrent liabilities and deferred credits | $ 0.1 | $ 0.1
Financial Guarantee [Member] |  |
Guarantor Obligations [Line Items] |  |
Loan amounts outstanding under the loan pools | 10.1 | 6.1
Maximum payments guaranteed | 1.7 |
Property Lease Guarantee [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum payments guaranteed | $ 2.0 |

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

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