Retirement Plans (Tables)

9 Months Ended

Oct. 02, 2016

Defined Benefit Pension Plans

Net Periodic Pension and Postretirement Cost (Income)

For the three and nine months ended October 2, 2016 and October 4, 2015, Teradyne’s net periodic pension cost (income) was comprised of the following:

	For the Three Months Ended
	October 2, 2016						October 4, 2015
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	575		$	208		$	616		$	259
Interest cost		3,407			209			3,285			357
Expected return on plan assets		(3,458	)		(6	)		(3,629	)		(185	)
Amortization of prior service cost		24			—			34			—
Actuarial loss		—			662			—			—
Total net periodic pension cost	$	548		$	1,073		$	306		$	431

	For the Nine Months Ended
	October 2, 2016						October 4, 2015
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	1,726		$	614		$	1,847		$	768
Interest cost		10,222			614			9,856			1,101
Expected return on plan assets		(10,373	)		(17	)		(10,888	)		(595	)
Amortization of prior service cost		72			—			101			—
Actuarial (gain) loss		(1,848	)		662			(3	)		—
Settlement		—			(184	)		—			—
Total net periodic pension (income) cost	$	(201	)	$	1,689		$	913		$	1,274

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Cost (Income)

For the three months and nine months ended October 2, 2016 and October 4, 2015, Teradyne’s net periodic postretirement income was comprised of the following:

	For the Three Months Ended						For the Nine Months Ended
	October 2, 2016			October 4, 2015			October 2, 2016			October 4, 2015
	(in thousands)
Service cost	$	9		$	12		$	28		$	36
Interest cost		54			59			163			177
Amortization of prior service credit		(151	)		(150	)		(455	)		(449	)
Actuarial gain		—			—			(15	)		(19	)
Total net periodic post-retirement income	$	(88	)	$	(79	)	$	(279	)	$	(255	)