Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2024

Defined Benefit Pension Plans

Net Periodic Pension and Postretirement Benefit Costs

For the three months ended March 31, 2024 and April 2, 2023, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended
	March 31, 2024						April 2, 2023
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	231		$	117		$	272		$	109
Interest cost		1,647			246			1,711			262
Expected return on plan assets		(1,268	)		(16	)		(1,285	)		(9	)
Total net periodic pension cost	$	610		$	347		$	698		$	362

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Benefit Costs

For the three months ended March 31, 2024 and April 2, 2023, Teradyne’s net periodic postretirement benefit cost was comprised of the following:

	For the Three Months  Ended
	March 31, 2024			April 2, 2023
	(in thousands)
Service cost	$	10		$	9
Interest cost		73			61
Amortization of prior service credit		(2	)		(2	)
Special termination benefits		292			—
Total net periodic postretirement benefit cost	$	373		$	68