Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Income Statement [Abstract]
Revenue	$ 269,158	$ 169,097	$ 508,185	$ 336,332
Cost of revenue	68,432	50,320	122,477	91,520
Gross margin	200,726	118,777	385,708	244,812
Research, development, and engineering expenses	31,302	30,397	65,407	66,343
Selling, general, and administrative expenses	76,843	60,153	149,267	129,291
Operating income (loss)	92,581	(6,142)	171,034	14,809
Foreign currency gain (loss)	(639)	336	(1,647)	(2,667)
Investment income	1,723	3,291	3,277	8,520
Other income (expense)	(127)	203	(295)	20
Income (loss) before income tax expense (benefit)	93,538	(2,312)	172,369	20,682
Income tax expense (benefit)	15,940	(1,170)	24,923	1,347
Net Income	$ 77,598	$ (1,142)	$ 147,446	$ 19,335
Net income (loss) per weighted-average common and common-equivalent share:
Basic (usd per share)	$ 0.44	$ (0.01)	$ 0.84	$ 0.11
Diluted (usd per share)	$ 0.43	$ (0.01)	$ 0.82	$ 0.11
Weighted-average common and common-equivalent shares outstanding:
Basic (shares)	176,626	172,283	176,454	172,345
Diluted (shares)	179,991	172,283	179,982	175,499
Cash dividends per common share (usd per share)	$ 0.060	$ 0.055	$ 0.120	$ 0.110
Restructuring charges (Note 16)	$ 0	$ 14,798	$ 0	$ 14,798
Intangible asset impairment charges (Note 8)	$ 0	$ 19,571	$ 0	$ 19,571