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Summary of Significant Accounting Policies, Segment (Details) - restaurant | Dec. 25, 2018 | Dec. 26, 2017
--- | --- | ---
Company |  |
Segment Reporting |  |
Number of restaurants | 491 | 462
Franchise |  |
Segment Reporting |  |
Number of restaurants | 91 | 87

X
- Definition Represents the number of restaurants. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + 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: |
Data Type: | na
Balance Type: |
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |