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v2.4.1.9

Summary of Significant Accounting Policies (Details 4) | Dec. 30, 2014 restaurant | Dec. 31, 2013 restaurant
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Segment Reporting |  |
Number of restaurants | 451us-gaap_NumberOfRestaurants | 420us-gaap_NumberOfRestaurants
Company-owned |  |
Segment Reporting |  |
Number of restaurants | 372us-gaap_NumberOfRestaurants / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember | 346us-gaap_NumberOfRestaurants / us-gaap_FranchisorDisclosureAxis = us-gaap_EntityOperatedUnitsMember
Franchise |  |
Segment Reporting |  |
Number of restaurants | 79us-gaap_NumberOfRestaurants / us-gaap_FranchisorDisclosureAxis = us-gaap_FranchisedUnitsMember | 74us-gaap_NumberOfRestaurants / us-gaap_FranchisorDisclosureAxis = us-gaap_FranchisedUnitsMember

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

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

X
- Details
Name: | us-gaap_FranchisorDisclosureAxis=us-gaap_EntityOperatedUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FranchisorDisclosureAxis=us-gaap_FranchisedUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |