Definite-lived Intangibles (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 28, 2020	Dec. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 445,150	$ 445,150
Accumulated Amortization	(152,870)	(119,470)
Net Carrying Amount	292,280	325,680
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	397,500	396,270
Accumulated Amortization	(140,552)	(111,272)
Net Carrying Amount	$ 256,948	$ 284,998
Weighted Average Amortization Period	10 years 10 months 24 days	11 years
Customer Relationships | Acquired Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Amount		$ 1,230
Accumulated Amortization		(31)
Net Carrying Amount		$ 1,199
Weighted Average Amortization Period		5 years
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 47,650	$ 39,500
Accumulated Amortization	(12,318)	(8,064)
Net Carrying Amount	$ 35,332	$ 31,436
Weighted Average Amortization Period	9 years 6 months	9 years 4 months 24 days
Technology | Acquired Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Amount		$ 8,150
Accumulated Amortization		(103)
Net Carrying Amount		$ 8,047
Weighted Average Amortization Period		10 years