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Commitments and Contingencies Commitments and Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
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	10.0	$ 9.8
Maximum payments guaranteed	1.7
Property Lease Guarantee [Member]
Guarantor Obligations [Line Items]
Maximum payments guaranteed	$ 2.0

X

- 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

X

- 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_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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_
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Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: