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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Jun. 25, 2011 June 5, 2011 Acquisition [Member]	Dec. 31, 2010 June 5, 2011 Acquisition [Member]	Sep. 24, 2011 October 9, 2011 Acquisition [Member]	Dec. 31, 2010 October 9, 2011 Acquisition [Member]
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		$ 36		$ 9
Number Of Stores Acquired	24		7

X

- Definition

The number of stores acquired by the entity during the period.

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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.

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X

- Definition

Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition.

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