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Summary of Significant Accounting Policies (Details 4)	Dec. 27, 2011 restaurant	Dec. 28, 2010 restaurant
Segment Reporting
Number of restaurants	366	345
Company-owned
Segment Reporting
Number of restaurants	294	274
Franchised or licensed
Segment Reporting
Number of restaurants	72	71

X

- Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant