Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	$ 45,385	$ 32,584
Accumulated amortization	(18,059)	(30,378)
Net carrying amount	27,326	2,206
Developed technology [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	35,954	18,887
Accumulated amortization	(16,532)	(16,681)
Net carrying amount	19,422	2,206
Customer relationships [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	6,531	9,438
Accumulated amortization	(1,519)	(9,438)
Net carrying amount	5,012	0
Brand names [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost		1,927
Accumulated amortization		(1,927)
Net carrying amount		0
Patented technology [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost		2,252
Accumulated amortization		(2,252)
Net carrying amount		0
In-Process research and development [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	1,400
Accumulated amortization	0
Net carrying amount	1,400
Trade name [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	1,500	80
Accumulated amortization	(8)	(80)
Net carrying amount	$ 1,492	$ 0