Income Taxes (Narrative) (Details) (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2010	Dec. 30, 2011	Dec. 30, 2011 Federal [Member]	Dec. 30, 2011 Federal [Member] Minimum [Member]	Dec. 30, 2011 Federal [Member] Maximum [Member]	Dec. 30, 2011 California [Member]	Dec. 30, 2011 Foreign [Member]	Dec. 30, 2011 Unrecognized Income Tax Benefits [Member]	Dec. 31, 2010 Unrecognized Income Tax Benefits [Member]	Jan. 01, 2010 Unrecognized Income Tax Benefits [Member]	Jan. 02, 2009 Unrecognized Income Tax Benefits [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Increase in effective tax rate	20.00%
Net operating loss carryforwards			$ 29,100,000			$ 13,800,000	$ 89,300,000
Net operating loss carryforwards, expiration, year				2017	2031
Research and development credit carryforwards			2,400,000			15,800,000
Federal research and development credit carryforwards, expiration, year				2012	2024
Foreign subsidiary accumulated undistributed earnings		178,400,000
Unrecognized deferred tax liability		62,500,000
Total amount of the unrecognized tax benefits	17,830,000	15,733,000						28,718,000	28,113,000	43,297,000	40,328,000
Income tax settlement, net charge	$ 27,500,000