Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 29, 2019	Dec. 31, 2019	Mar. 29, 2020
Finite-Lived Intangible Assets
Gross Carrying Amount		$ 507,836	$ 507,836
Accumulated Amortization		(375,008)	(384,899)
Foreign Currency Translation Adjustment	$ (8,616)	(7,348)
Net Carrying Amount		125,480	114,321
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount		361,787	361,787
Accumulated Amortization		(279,000)	(286,166)
Foreign Currency Translation Adjustment	(6,663)	(5,709)
Net Carrying Amount		77,078	68,958
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount		75,669	75,669
Accumulated Amortization		(59,077)	(60,406)
Foreign Currency Translation Adjustment	(547)	(455)
Net Carrying Amount		16,137	14,716
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount		70,120	70,120
Accumulated Amortization		(36,671)	(38,067)
Foreign Currency Translation Adjustment	$ (1,406)	(1,184)
Net Carrying Amount		32,265	30,647
Backlog
Finite-Lived Intangible Assets
Gross Carrying Amount		260	260
Accumulated Amortization		$ (260)	$ (260)