Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 28, 2020	Dec. 28, 2019
Intangible assets with finite lives:
Gross Carrying Amount	$ 328,284	$ 336,535
Accumulated Amortization	(172,928)	(166,189)
Net Carrying Amount	155,356	170,346
Trade names
Intangible assets with finite lives:
Gross Carrying Amount	1,000	1,000
Accumulated Amortization	(1,000)	(1,000)
Net Carrying Amount	0	0
Customer relationships and backlog
Intangible assets with finite lives:
Gross Carrying Amount	153,216	155,942
Accumulated Amortization	(71,159)	(68,119)
Net Carrying Amount	$ 82,057	$ 87,823
Weighted average remaining useful life (in years)	5 years 7 months 6 days	5 years 9 months 18 days
Developed technology
Intangible assets with finite lives:
Gross Carrying Amount	$ 174,068	$ 179,593
Accumulated Amortization	(100,769)	(97,070)
Net Carrying Amount	$ 73,299	$ 82,523
Weighted average remaining useful life (in years)	3 years 6 months	3 years 6 months