Summary of Restructuring Costs (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 28, 2020	Sep. 28, 2020	Sep. 30, 2019	Sep. 28, 2020	Sep. 30, 2019
Reportable Segment:
Restructuring charges	$ 14,671
General and administrative
Reportable Segment:
Restructuring charges		$ 1,088	$ 12	$ 14,830	$ 3,176
General and administrative | Employee Separation/ Severance
Reportable Segment:
Restructuring charges		979	5	14,365	3,153
General and administrative | Contract Termination and Other Costs
Reportable Segment:
Restructuring charges		109	7	465	23
General and administrative | Reportable Segment | Printed Circuit Board
Reportable Segment:
Restructuring charges			5	6	2,941
General and administrative | Reportable Segment | E-M Solutions
Reportable Segment:
Restructuring charges		986		14,671
General and administrative | Reportable Segment | RF&S Components
Reportable Segment:
Restructuring charges					52
General and administrative | Reportable Segment | Employee Separation/ Severance | Printed Circuit Board
Reportable Segment:
Restructuring charges			5	(8)	2,941
General and administrative | Reportable Segment | Employee Separation/ Severance | E-M Solutions
Reportable Segment:
Restructuring charges		979		14,373
General and administrative | Reportable Segment | Employee Separation/ Severance | RF&S Components
Reportable Segment:
Restructuring charges					52
General and administrative | Reportable Segment | Contract Termination and Other Costs | Printed Circuit Board
Reportable Segment:
Restructuring charges				14
General and administrative | Reportable Segment | Contract Termination and Other Costs | E-M Solutions
Reportable Segment:
Restructuring charges		7		298
General and administrative | Corporate
Reportable Segment:
Restructuring charges		102	7	153	183
General and administrative | Corporate | Employee Separation/ Severance
Reportable Segment:
Restructuring charges					160
General and administrative | Corporate | Contract Termination and Other Costs
Reportable Segment:
Restructuring charges		$ 102	$ 7	$ 153	$ 23