Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Consolidated Statements of Income
Revenues	$ 868,267	$ 768,867	$ 697,626
Cost of revenues	346,868	314,676	276,122
Gross margin	521,399	454,191	421,504
Operating expenses:
Research and development	238,347	209,491	199,744
Selling, general and administrative	197,844	159,726	155,483
Operating expenses	436,191	369,217	355,227
Operating income	85,208	84,974	66,277
Other income (expense):
Interest income and other, net	6,647	6,057	806
Interest expense	(19,694)	(14,128)	(2,587)
Income before income taxes	72,161	76,903	64,496
Provision (benefit) for income taxes	(11,430)	29,811	3,002
Net income	$ 83,591	$ 47,092	$ 61,494
Earnings per share:
Basic (in dollars per share)	$ 1.94	$ 1.11	$ 1.47
Diluted (in dollars per share)	$ 1.90	$ 1.09	$ 1.45
Weighted-average common shares outstanding:
Basic (in shares)	43,159	42,446	41,713
Diluted (in shares)	44,044	43,332	42,376