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Segment Information and Enterprise Reporting - Analysis of Product Revenues Based upon Geographic Area Shipped (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Revenue, Major Customer [Line Items]
Product revenue	$ 300,953	$ 229,510	$ 570,578	$ 460,058
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
United States (U.S.) | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Product revenue	$ 194,721	$ 155,513	$ 384,240	$ 312,181
Concentration Risk, Percentage	64.70%	67.80%	67.30%	67.90%
Europe, Middle East and Africa | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Product revenue	$ 68,167	$ 45,406	$ 122,524	$ 93,878
Concentration Risk, Percentage	22.70%	19.80%	21.50%	20.40%
Asia and Australia | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Product revenue	$ 26,259	$ 21,685	$ 45,572	$ 39,803
Concentration Risk, Percentage	8.70%	9.40%	8.00%	8.70%
North and South America (excluding the U.S.) | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Product revenue	$ 11,806	$ 6,906	$ 18,242	$ 14,196
Concentration Risk, Percentage	3.90%	3.00%	3.20%	3.00%

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