Goodwill, Other Intangible Assets and Other Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Document Period End Date			Jun. 27, 2020
Finite-Lived Intangible Assets, Gross	$ 71,595		$ 71,595		$ 71,231
Intangible assets accumulated amortization	61,171		61,171		58,879
Intangible Assets, Net	10,424		10,424		12,352
Amortization of Acquired Intangible Assets	1,400	$ 3,400	2,000	$ 6,700
Completed technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	28,100		28,100		28,100
Intangible assets accumulated amortization	26,075		26,075		24,605
Intangible Assets, Net	2,025		2,025		3,495
Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	100		100		100
Intangible assets accumulated amortization	100		100		100
Intangible Assets, Net	0		0		0
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,165		11,165		11,095
Intangible assets accumulated amortization	2,787		2,787		2,302
Intangible Assets, Net	8,378		8,378		8,793
Distribution Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	31,972		31,972		31,680
Intangible assets accumulated amortization	31,972		31,972		31,680
Intangible Assets, Net	0		0		0
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	258		258		256
Intangible assets accumulated amortization	237		237		192
Intangible Assets, Net	$ 21		$ 21		$ 64