Stockholders' Equity (Employee and Director Stock Options, Restricted Stock and ESPP) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended				1 Months Ended		12 Months Ended								1 Months Ended		12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Dec. 29, 2012 Restricted Stock Units (RSUs)	May 31, 2012 ESPP	May 31, 2007 ESPP	Dec. 31, 2011 ESPP	Jan. 01, 2011 ESPP	Dec. 29, 2012 Principal option plans Stock options	Dec. 29, 2012 Principal option plans Stock options Issued prior to January 31, 2006	Dec. 29, 2012 Principal option plans Stock options Issued subsequent to January 31, 2006	Dec. 29, 2012 1996 Plan Stock options	Dec. 29, 2012 2001 Plan Stock options	May 31, 2011 2011 Non-Employee Director Equity Incentive Plan	May 31, 2011 2011 Non-Employee Director Equity Incentive Plan Stock options	May 31, 2011 2011 Non-Employee Director Equity Incentive Plan Restricted Stock Units (RSUs)	Dec. 29, 2012 2012 ESPP ESPP Maximum	Dec. 29, 2012 2007 ESPP ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					3,000,000	5,500,000						17,200,000	9,000,000	750,000
Award vesting period				4 years					4 years						3 years	1 year
Contractual term of award										10 years	7 years				10 years
Percentage of employee's compensation maximum for employee share purchases					10.00%	10.00%
Purchase price of shares as percentage of fair market value					85.00%	85.00%
Compensation expense	$ 7,510	$ 6,356	$ 4,551				$ 500	$ 400									$ 100	$ 100