Selected Quarterly Financial Data - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
TCJA one-time charge	$ 3,200				$ 49,000
Benefit for previously unrecognized tax benefits in respect of which the statute of limitation has expired	1,500								$ 1,257
Backlog amortization costs	3,700	$ 3,100	$ 3,100	$ 2,500
Acquisition related costs	3,200	2,900	2,400	11,700	1,400	$ 4,800	$ 300	$ 1,500
Restructuring, impairment and other costs	$ 2,400	$ 5,200	4,200						12,583	$ 2,227	$ 18,804
Purchase accounting inventory adjustments			$ 19,000	17,900
Stock compensation expense				4,500					$ 27,431	$ 16,315	$ 11,987
Change in control expense				2,100
Restructuring costs				$ 800	$ 700	$ 1,500