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Leases (Net Rental Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 25, 2013 | Dec. 26, 2012
Rental Expense: |  |  |
Base rents | $ 33,402 us-gaap_OperatingLeasesRentExpenseMinimumRentals | $ 35,667 us-gaap_OperatingLeasesRentExpenseMinimumRentals | $ 38,326 us-gaap_OperatingLeasesRentExpenseMinimumRentals
Contingent rents | 5,535 us-gaap_OperatingLeasesRentExpenseContingentRentals | 5,412 us-gaap_OperatingLeasesRentExpenseContingentRentals | 5,762 us-gaap_OperatingLeasesRentExpenseContingentRentals
Total rental expense | 38,937 denn_OperatingLeasesRentExpenseTotal | 41,079 denn_OperatingLeasesRentExpenseTotal | 44,088 denn_OperatingLeasesRentExpenseTotal
Rental income: |  |  |
Base rents | 33,926 denn_OperatingLeasesIncomeStatementMinimumLeaseAndSubleaseRevenue | 36,183 denn_OperatingLeasesIncomeStatementMinimumLeaseAndSubleaseRevenue | 37,363 denn_OperatingLeasesIncomeStatementMinimumLeaseAndSubleaseRevenue
Contingent rents | 4,608 us-gaap_OperatingLeasesIncomeStatementContingentRevenue | 4,389 us-gaap_OperatingLeasesIncomeStatementContingentRevenue | 3,871 us-gaap_OperatingLeasesIncomeStatementContingentRevenue
Total rental income | $ 38,534 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | $ 40,572 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | $ 41,234 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue

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- Definition The total amount of lease revenue recognized for the period which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue. + References No definition available. + Details
Name: | denn_OperatingLeasesIncomeStatementMinimumLeaseAndSubleaseRevenue
Namespace Prefix: | denn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense. + References No definition available. + Details
Name: | denn_OperatingLeasesRentExpenseTotal
Namespace Prefix: | denn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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X
- Definition The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Rentals -URI http://asc.fasb.org/extlink&oid=6508509 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6452616&loc=d3e36728-112689 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=7579899&loc=d3e35050-112683 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 + Details
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