Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 331,587	$ 296,250	$ 661,860	$ 588,957
United States
Disaggregation of Revenue [Line Items]
Total revenue	166,223	133,213	336,749	265,735
Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	25,832	29,535	45,520	44,667
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenue	97,168	90,467	185,746	189,459
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenue	42,364	43,035	93,845	89,096
Product
Disaggregation of Revenue [Line Items]
Total revenue	261,227	226,866	516,419	449,873
Services
Disaggregation of Revenue [Line Items]
Total revenue	70,360	69,384	145,441	139,084
Direct
Disaggregation of Revenue [Line Items]
Total revenue	268,326	241,017	512,677	489,213
Indirect
Disaggregation of Revenue [Line Items]
Total revenue	$ 63,261	$ 55,233	$ 149,183	$ 99,744