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Subsequent Events (Details Textual) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended			1 Months Ended
	Sep. 29, 2012 Class A Common Stock [Member]	Sep. 24, 2011 Class A Common Stock [Member]	Sep. 25, 2010 Class A Common Stock [Member]	Dec. 31, 2012 Class A Common Stock [Member] Subsequent Event [Member]	Sep. 29, 2012 Class B Common Stock [Member]	Sep. 24, 2011 Class B Common Stock [Member]	Sep. 25, 2010 Class B Common Stock [Member]	Dec. 31, 2012 Class B Common Stock [Member] Subsequent Event [Member]
Subsequent Events (Textual) [Abstract]
Dividend declared	$ 0.66	$ 0.66	$ 0.66	$ 0.66	$ 0.60	$ 0.60	$ 0.60	$ 0.60

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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