Retirement Plans (Tables)

3 Months Ended

Apr. 03, 2016

Postretirement Benefit Plans

Net Periodic Pension and Postretirement (Income) Cost

For the three months ended April 3, 2016 and April 5, 2015, Teradyne’s net periodic postretirement benefit income was comprised of the following:

	For the Three Months Ended
	April 3, 2016			April 5, 2015
	(in thousands)
Service cost	$	10		$	12
Interest cost		56			59
Amortization of prior service benefit		(150	)		(149	)
Total net periodic post-retirement benefit	$	(84	)	$	(78	)

Defined Benefit Pension Plans

Net Periodic Pension and Postretirement (Income) Cost

For the three months ended April 3, 2016 and April 5, 2015, Teradyne’s net periodic pension (income) cost was comprised of the following:

	For the Three Months Ended
	April 3, 2016						April 5, 2015
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	576		$	207		$	616		$	247
Interest cost		3,414			206			3,282			358
Expected return on plan assets		(3,443	)		(5	)		(3,624	)		(195	)
Amortization of prior service cost		24			—			33			—
Net actuarial gain		(1,193	)		—			—			—
Settlement		—			(239	)		—			—
Total net periodic pension (income) cost	$	(622	)	$	169		$	307		$	410