Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Consolidated Statements of Income
Revenues	$ 768,867	$ 697,626	$ 644,826
Cost of revenues	314,676	276,122	264,056
Gross margin	454,191	421,504	380,770
Operating expenses:
Research and development	209,491	199,744	188,050
Selling, general and administrative	159,726	155,483	160,486
Operating expenses	369,217	355,227	348,536
Operating income	84,974	66,277	32,234
Other income (expense):
Interest income and other, net	6,057	806	857
Interest expense	(14,128)	(2,587)	(2,828)
Income before income taxes	76,903	64,496	30,263
Provision for income taxes	29,811	3,002	677
Net income	$ 47,092	$ 61,494	$ 29,586
Earnings per share:
Basic (in dollars per share)	$ 1.11	$ 1.47	$ 0.70
Diluted (in dollars per share)	$ 1.09	$ 1.45	$ 0.69
Weighted-average common shares outstanding:
Basic (in shares)	42,446	41,713	42,309
Diluted (in shares)	43,332	42,376	42,945