CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Income Statement [Abstract]
Revenue	$ 204,216	$ 162,584
Cost of revenue	113,940	93,844
Gross profit	90,276	68,740
Operating expenses:
Research and development and engineering	20,929	18,682
Selling, general and administrative	39,352	31,653
Amortization of purchased intangible assets	7,342	3,575
Restructuring, acquisition and related costs	(1,630)	3,731
Total operating expenses	65,993	57,641
Operating income	24,283	11,099
Interest income (expense), net	(3,109)	(1,408)
Foreign exchange transaction gains (losses), net	69	(257)
Other income (expense), net	(545)	(70)
Income before income taxes	20,698	9,364
Income tax provision (benefit)	1,878	(1,946)
Consolidated net income	$ 18,820	$ 11,310
Earnings per common share (Note 4):
Basic	$ 0.53	$ 0.32
Diluted	$ 0.53	$ 0.32
Weighted average common shares outstanding—basic	35,538	35,279
Weighted average common shares outstanding—diluted	35,781	35,789