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Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure
Net actuarial (gain) loss			$ (99)	$ 448
UNITED STATES
Defined Benefit Plan Disclosure
Service cost	$ 433	$ 399	866	804
Interest cost	1,523	1,799	3,045	3,595
Expected return on plan assets	(1,232)	(1,510)	(2,464)	(3,021)
Net actuarial (gain) loss	180	252	180	252
Total net periodic pension (credit) cost	904	940	1,627	1,630
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	208	192	417	381
Interest cost	119	176	238	349
Expected return on plan assets	(15)	(7)	(31)	(14)
Total net periodic pension (credit) cost	312	361	624	716
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	17	11	28	20
Interest cost	58	88	120	173
Amortization of prior service cost	(2)	(48)	(4)	(95)
Net actuarial (gain) loss	(279)	196	(279)	196
Total net periodic pension (credit) cost	$ (206)	$ 247	$ (135)	$ 294

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