Consolidated Statements of Net Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Statement [Abstract]
Net sales	$ 1,503,873	$ 1,718,468	$ 1,221,534
Cost of sales	962,424	1,065,927	715,001
Gross profit	541,449	652,541	506,533
Selling, general, and administrative expenses	228,093	288,001	212,833
Research and development expenses	80,539	87,301	50,489
Amortization of intangibles	40,026	52,190	24,700
Total operating expenses	348,658	427,492	288,022
Operating income	192,791	225,049	218,511
Interest expense	22,266	22,569	13,380
Foreign exchange loss (gain)	5,224	(863)	2,376
Other income, net	(583)	(1,599)	(1,282)
Income before income taxes	165,884	204,942	204,037
Income taxes	26,802	40,377	84,518
Net income	$ 139,082	$ 164,565	$ 119,519
Income per share:
Basic (in dollars per share)	$ 5.66	$ 6.62	$ 5.27
Diluted (in dollars per share)	$ 5.60	$ 6.52	$ 5.21
Weighted average shares and equivalent shares outstanding:
Basic (in shares)	24,576	24,870	22,687
Diluted (in shares)	24,818	25,235	22,931