Retirement Plans (Tables)

6 Months Ended

Jul. 01, 2018

Defined Benefit Pension Plans

Net Periodic Pension and Postretirement benefit Cost (Income)

For the three and six months ended July 1, 2018 and July 2, 2017, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended
	July 1, 2018						July 2, 2017
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	545		$	200		$	560		$	206
Interest cost		2,430			175			3,264			179
Expected return on plan assets		(2,550	)		(5	)		(3,004	)		(6	)
Amortization of prior service cost		14			—			18			243
Net actuarial gain		(189	)		—			(2,732	)		—
Settlement loss		78			—			—			—
Total net periodic pension cost (benefit)	$	328		$	370		$	(1,894	)	$	622

	For the Six Months Ended
	July 1, 2018						July 2, 2017
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	1,116		$	426		$	1,120		$	392
Interest cost		5,427			372			6,576			342
Expected return on plan assets		(5,919	)		(10	)		(6,004	)		(12	)
Amortization of prior service cost		29			—			35			—
Net actuarial gain		(189	)		—			(2,732	)		243
Settlement loss		78			—			—			—
Total net periodic pension cost (benefit)	$	542		$	788		$	(1,005	)	$	965

Postretirement Benefit Plans

Net Periodic Pension and Postretirement benefit Cost (Income)

For the three and six months ended July 1, 2018 and July 2, 2017, Teradyne’s net periodic postretirement benefit cost (income) was comprised of the following:

	For the Three Months Ended						For the Six Months Ended
	July 1, 2018			July 2, 2017			July 1, 2018			July 2, 2017
	(in thousands)
Service cost	$	10		$	7		$	19		$	17
Interest cost		48			50			98			100
Amortization of prior service credit		(93	)		(124	)		(187	)		(248	)
Net actuarial loss (gain)		40			(15	)		40			(15	)
Special termination benefits		1,192			—			2,818			—
Total net periodic postretirement benefit cost (income)	$	1,197		$	(82	)	$	2,788		$	(146	)