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Employee Benefit Plans (Defined Contribution Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 25, 2019 | Dec. 26, 2018 | Dec. 27, 2017
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 1.9 | $ 2.2 | $ 2.0
Qualified Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Maximum annual contribution per employee | 25.00% |  |
Employer matching contribution | 4.00% |  |
Nonqualified Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Maximum annual contribution per employee | 50.00% |  |
Maximum incentive compensation deferral | 75.00% |  |

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- Definition Defined Contribution Plan, Maximum Amount of Incentive Compensation Deferred, Percent + References No definition available. + Details
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Namespace Prefix: | denn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- 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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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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