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Retirement Plans - Defined Benefit Plan, Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
United States [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost				$ 23
Net periodic pension cost				23
United States [Member] | Retiree Healthcare Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 197	$ 124	$ 499	374
Interest cost	180	194	533	583
Expected return on plan assets	(214)	(177)	(653)	(531)
Net amortization: Prior service credit	(4)	(5)	(14)	(15)
Net periodic pension cost	159	136	365	411
Non-U.S. Pension Plans [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,140	1,081	3,334	3,238
Interest cost	353	426	1,036	1,291
Expected return on plan assets	(476)	(535)	(1,386)	(1,616)
Net amortization: Prior service credit	(41)	(38)	(122)	(113)
Net amortization: Net actuarial loss	397	132	1,164	399
Net periodic pension cost	$ 1,373	$ 1,066	$ 4,026	$ 3,199

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