Retirement Plans (Tables)

6 Months Ended

Jun. 29, 2014

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Cost (Benefit)

For the three and six months ended June 29, 2014 and June 30, 2013, Teradyne’s net periodic postretirement benefit was comprised of the following:

	For the Three Months Ended						For the Six Months Ended
	June 29, 2014			June 30, 2013			June 29, 2014			June 30, 2013
	(in thousands)
Service cost	$	17		$	21		$	29		$	37
Interest cost		82			84			168			171
Amortization of unrecognized prior service benefit		(150	)		(150	)		(299	)		(299	)
Actuarial gain		(247	)		(236	)		(247	)		(236	)
Total net periodic post-retirement benefit	$	(298	)	$	(281	)	$	(349	)	$	(327	)

Defined Benefit Pension Plans

Net Periodic Pension and Postretirement Cost (Benefit)

For the three and six months ended June 29, 2014 and June 30, 2013, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended						For the Six Months Ended
	June 29, 2014			June 30, 2013			June 29, 2014			June 30, 2013
	(in thousands)
Service cost	$	811		$	852		$	1,607		$	1,686
Interest cost		3,732			3,281			7,452			6,651
Expected return on plan assets		(3,384	)		(3,631	)		(6,725	)		(7,261	)
Amortization of unrecognized prior service cost		34			41			67			82
Actuarial loss (gain)		362			(1,123	)		362			(1,123	)
Total net periodic pension cost (benefit)	$	1,555		$	(580	)	$	2,763		$	35