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Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2020	Dec. 31, 2018	Dec. 30, 2019
Goodwill [Line Items]
Goodwill	$ 877,924	$ 870,178	$ 877,924
Accumulated impairment losses	(240,600)	(171,400)	(171,400)
Goodwill, net	637,324	698,778	706,524
Goodwill recognized during the year		7,746
Impairment loss during the year	(69,200)
Printed Circuit Board
Goodwill [Line Items]
Goodwill	700,724	692,978	700,724
Accumulated impairment losses	(171,400)	(171,400)	(171,400)
Goodwill, net	529,324	521,578	529,324
Goodwill recognized during the year		7,746
RF&S Components
Goodwill [Line Items]
Goodwill	177,200	177,200	177,200
Accumulated impairment losses	(69,200)
Goodwill, net	108,000	$ 177,200	$ 177,200
Impairment loss during the year	$ (69,200)

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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