CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 01, 2016	Jan. 02, 2015	Jan. 03, 2014
Consolidated Statement Of Income [Abstract]
Revenue	$ 521,616	$ 562,555	$ 575,195
Cost of revenue	213,820	235,800	258,588
Gross profit	307,796	326,755	316,607
Operating costs and expenses:
Research and development	126,350	125,851	130,541
Selling, general and administrative	96,963	99,926	113,333
Amortization of purchased intangibles	17,625	22,241	24,579
Restructuring and related costs			28,694
Provision for export compliance settlement		4,000	6,000
Provision for TAOS litigation	81,100
Operating (loss) income	(14,242)	74,737	13,460
Interest expense and other	(1,415)	(1,742)	(1,901)
Gain on investments, net	885	1,538	2,318
(Loss) income before taxes	(14,772)	74,533	13,877
Income tax (benefit) expense	(21,958)	19,721	11,022
Net income	$ 7,186	$ 54,812	$ 2,855
Earnings per share
Basic	$ 0.05	$ 0.42	$ 0.02
Diluted	0.05	0.41	0.02
Cash dividends declared per common share	$ 0.48	$ 0.48	$ 0.48
Weighted average common shares outstanding:
Basic	131,793	129,149	127,151
Diluted	133,273	132,657	127,998