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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 26, 2012	Dec. 28, 2011
Guarantor Obligations [Line Items]
Number of restaurants	1,688	1,685
Restaurant Conversion [Member]
Guarantor Obligations [Line Items]
Liabilities recorded and included as a component of other noncurrent liabilities and deferred credits	$ 0.1	$ 0.2
Restaurant Conversion [Member] | Property Lease Guarantee [Member]
Guarantor Obligations [Line Items]
Maximum payments guaranteed	2.0
Term of guaranteed lease payments	first five years of the related leases
Restaurant Conversion [Member] | Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Maximum payments guaranteed	0.9
Loan amounts outstanding under the loan pools	7.2	15.5
Term of guaranteed lease payments	generally five years
Restaurant Conversion [Member] | Converted Restaurant Units [Member]
Guarantor Obligations [Line Items]
Number of restaurants		123
Franchisee Loan Program [Member] | Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Maximum payments guaranteed	12.0
Maximum payments guaranteed (percent)	12.00%
Loan amounts outstanding under the loan pools	0	0
Loans provided to new and existing franchisees	$ 100

X

- Definition

Guarantor Obligations, Loans Payable of Franchisee

+ References

No definition available.

+ Details

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X

- Definition

Guarantor Obligations, Maximum Exposure, Percent

+ References

No definition available.

+ Details

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X

- Definition

Loan Provided by Banks to franchisees, Maximum Lending Capicity

+ References

No definition available.

+ Details

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X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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- Definition

Describe the approximate term of the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Represents the number of restaurants.

+ References

No definition available.

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