Stockholders' Equity (Details Textual) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended	41 Months Ended	0 Months Ended	12 Months Ended			19 Months Ended	0 Months Ended		12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Jul. 26, 2007 July 26, 2007 Program [Member]	Jan. 01, 2011 July 26, 2007 Program [Member]	Dec. 31, 2010 July 26, 2007 Program [Member]	Nov. 29, 2010 November 29, 2010 Program [Member]	Dec. 29, 2012 November 29, 2010 Program [Member]	Dec. 31, 2011 November 29, 2010 Program [Member]	Jan. 01, 2011 November 29, 2010 Program [Member]	Jun. 30, 2012 November 29, 2010 Program [Member]	Dec. 29, 2012 May 29, 2012 Program [Member]	May 29, 2012 May 29, 2012 Program [Member]	Dec. 29, 2012 May 29, 2012 Program [Member]	Dec. 29, 2012 Employee Stock Purchase Plan [Member]	Dec. 31, 2011 Employee Stock Purchase Plan [Member]	Jan. 01, 2011 Employee Stock Purchase Plan [Member]
Preferred and Common Stock and Stock Repurchases
Shares of common stock	47,000,000	47,000,000
Common stock, par value per share	$ 0.001	$ 0.001
Shares of preferred stock	3,000,000	3,000,000
Preferred stock, par value per share	$ 0.001	$ 0.001
Maximum amount of common stock approved to repurchase, Value				$ 4,000,000			$ 10,000,000						$ 20,000,000
Common stock repurchased and retired, shares	587,766				96,492			337,366	265,040	65,000	667,406			250,400
Common stock repurchased and retired during period, value	8,504,000	4,257,000	2,097,000		1,300,000	4,000,000					10,000,000
Weighted average repurchase price of common stock	$ 14.47							$ 14.70	$ 16.06	$ 11.96	$ 14.97			$ 14.15
Remaining authorized repurchase amount												$ 16,500,000
Employee Stock Purchase Plan [Abstract]
Maximum percentage of salary withholdings															10.00%
Purchase price of common ctock, percent															85.00%
Shares remaining for issuance															700,000
Shares issued															65,355	112,491	56,326
Weighted average price of shares issued															$ 15.36	$ 12.92	$ 8.88