Retirement Plans (Tables)

3 Months Ended

Mar. 30, 2014

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Cost (Benefit)

For the three months ended March 30, 2014 and March 31, 2013, Teradyne’s net periodic postretirement benefit was comprised of the following:

	For the Three Months Ended
	March 30, 2014			March 31, 2013
	(in thousands)
Service cost	$	13		$	16
Interest cost		86			87
Amortization of unrecognized prior service benefit		(150	)		(150	)
Total net periodic postretirement benefit	$	(51	)	$	(47	)

Defined Benefit Pension Plans

Net Periodic Pension and Postretirement Cost (Benefit)

For the three months ended March 30, 2014 and March 31, 2013, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended
	March 30, 2014			March 31, 2013
	(in thousands)
Service cost	$	796		$	834
Interest cost		3,720			3,370
Expected return on plan assets		(3,342	)		(3,630	)
Amortization of unrecognized prior service cost		34			41
Total net periodic pension cost	$	1,208		$	615