Consolidated Statements of Net Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 1,718,468	$ 1,221,534	$ 1,056,159
Cost of sales	1,065,927	715,001	643,042
Gross profit	652,541	506,533	413,117
Selling, general, and administrative expenses	288,001	212,833	206,129
Research and development expenses	87,301	50,489	42,198
Amortization of intangibles	52,190	24,700	19,337
Impairment of goodwill and intangible assets	0	0	14,809
Total operating expenses	427,492	288,022	282,473
Operating income	225,049	218,511	130,644
Interest expense	22,569	13,380	8,628
Foreign exchange (gain) loss	(863)	2,376	472
Other income, net	(1,599)	(1,282)	(1,730)
Income before income taxes	204,942	204,037	123,274
Income taxes	40,377	84,518	18,786
Net income	$ 164,565	$ 119,519	$ 104,488
Income per share:
Basic (in dollars per share)	$ 6.62	$ 5.27	$ 4.63
Diluted (in dollars per share)	$ 6.52	$ 5.21	$ 4.60
Weighted average shares and equivalent shares outstanding:
Basic (in shares)	24,870	22,687	22,559
Diluted (in shares)	25,235	22,931	22,727