XML 67 R55.htm IDEA: XBRL DOCUMENT
v3.19.2

Long-Term Debt Interest Rate Swaps (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 26, 2019 USD ($)
Derivative [Line Items] |  |
Interest rate swaps, net | $ (35,600) |
Interest Rate Swap 2018-2025 [Member] |  |
Derivative [Line Items] |  |
Trade date | Mar. 20, 2015 |
Effective date | Mar. 29, 2018 |
Maturity date | Mar. 31, 2025 |
Notional amount | $ 120,000 |
Fixed rate | 2.44% |
Interest Rate Swap 2018-2026 [Member] |  |
Derivative [Line Items] |  |
Trade date | Oct. 01, 2015 |
Effective date | Mar. 29, 2018 |
Maturity date | Mar. 31, 2026 |
Notional amount | $ 50,000 |
Fixed rate | 2.46% |
Interest Rate Swap 2020-2033 [Member] |  |
Derivative [Line Items] |  |
Trade date | Feb. 15, 2018 |
Effective date | Mar. 31, 2020 |
Maturity date | Dec. 31, 2033 |
Notional amount | $ 80,000 | [1]
Fixed rate | 3.19% |
Interest Rate Swap 2020-2033 [Member] | Maximum [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 425,000 |
[1] | The notional amounts of the swaps entered into on February 15, 2018 increase annually beginning September 30, 2020 until they reach the maximum notional amount of $425.0 million on September 28, 2029.

X
- Definition The date on which the parties to the derivative contract begin calculating accrued obligations, such as fixed and floating interest payment obligations on an interest rate swap, in CCYY-MM-DD format. + References No definition available. + Details
Name: | denn_DerivativeEffectiveDate
Namespace Prefix: | denn_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeInceptionDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=denn_InterestRateSwaps20182025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=denn_InterestRateSwaps20182026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=denn_InterestRateSwap20202033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |