Nature of Operations and Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Income from non-marketable equity investments accounted for on the equity method	$ 2,998	$ 3,328	$ 1,963
Royalty income from patents	29	66	79
Other	4	3	8
Other Income	$ 3,031	$ 3,397	$ 2,050