Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 196,864	$ 212,176
Accumulated Amortization	106,215	114,692
Intangible Assets, Net	90,649	97,484
Existing developed technologies
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	144,319	143,966
Accumulated Amortization	82,091	76,826
Intangible Assets, Net	62,228	67,140
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	12,126	12,086
Accumulated Amortization	6,430	5,735
Intangible Assets, Net	5,696	6,351
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	40,419	40,313
Accumulated Amortization	17,694	16,320
Intangible Assets, Net	22,725	23,993
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	0	15,811
Accumulated Amortization	0	15,811
Intangible Assets, Net	$ 0	$ 0